Yolo County
State of California
Yolo County is a county authority in the State of California, covering 12 regions, serving 216,403 residents. 1,539 residential solar installs are on record here. This page is the permit route for that jurisdiction: the fifteen steps from working out who has a say over an address through to permission to operate, the documents this authority publishes, and 62 answers taken from those documents and dated.
Permitting 5 steps · 28 questions
Whether a permit is needed — Yes Q3 Electrical and building permits — Combined Q4 Where you file — Yolo Builds (Salesforce Experience Cloud / Clariti) at https://yolo.my.site.com - but it does NOT take building permits. Q20
- Permit required
- Yes95% source
- What it costs
- $360.03 for a residential roof-mounted PV system up to 15 kW - $145.70 plan review plus $214.33 inspection - and above 15 kW add $5.46/kW (plan review) plus $5.81/kW (inspection) = $11.27 per kW.75% source
- Key document
- permit application form + fee schedule cited by 7 open the document
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Confirm who has a say over your address
A city address is usually permitted by the city, not the county — but not always, and some authorities keep building and hand electrical to someone else. Getting this wrong costs the whole submittal, because every requirement below belongs to whoever actually holds jurisdiction. Check the overlays in the same pass: an HOA, a historic district, a windstorm certification or a system-size cap can reshape the design, and all of them are cheaper to find now than after the array is laid out.
- Is this authority the AHJ for residential solar at this address? Yes 95% · department page + adopting ordinance
- What does this authority permit itself, and what does it delegate? Both 90% · department page + ordinance
- Is a permit required for a residential rooftop PV system? Yes 95% · ordinance
- Is there a separate electrical permit, or is it combined? Combined 70% · permit application form + fee schedule
- Is a HOA or architectural approval required first? No 70% · ordinance
- Is there a historic-district review? Yes, but narrowly - only on a designated Historic Landmark or a structure inside a designated Historic District, and even then rooftop solar does NOT go to the Historic Preservation Commission by default. YCC 8-11.105(b) lists 'solar collectors on roof' among the items that 'do not require review by the Historic Preservation Commission. Approval by the Planning, Public Works and Environmental Services Department will be issued upon approval of a building permit' - with a discretionary escape: 'The Department may refer applications to the Historic Preservation Commission as deemed reasonably necessary in the discretion of the Department Director.' If referred, the Commission (which is the Planning Commission wearing a second hat, per 8-11.103(a)) must decide within 90 days of filing, and no building permit may issue until it files a letter of approval. YCC 8-2.1104(d)(7) adds that solar on a designated Landmark or in a designated District 'may be permitted provided that the design of the facilities is consistent with the purposes of the Landmark or District designation'. On any property that is not designated, there is no historic review at all. 85% · ordinance
- Is a wind or windstorm certification required? No 85% · department page
- Is a Specific Use Permit or Council approval ever required? Only in one narrow, statutorily-framed case for residential rooftop. YCC 8-2.1104(d)(4): small accessory-use roof- and ground-mounted systems are approved in all zones by Building Permit plus Zoning Clearance, but 'consistent with Section 65850.5 of the California Government Code, if the Chief Building Official has a good faith belief that the solar energy system could have a specific, adverse impact upon the public health and safety, the Official may require the applicant to apply for a Use Permit. Such a Use Permit shall be considered by the Zoning Administrator according to the requirements of Section 65850.5.' 'Specific, Adverse Impact' is defined in 8-2.1104(b) as a significant, quantifiable, direct and unavoidable impact based on objective, identified, written public health or safety standards as they existed when the application was deemed complete. No Board or Planning Commission approval is ever required for residential rooftop. Larger systems escalate: accessory systems of 2.5-7.5 acres need Site Plan Review, medium-sized (7.5-30 acres) Site Plan Review or a Minor Use Permit, large-scale (over 30 acres) a Major Use Permit from the Planning Commission, and over 120 acres goes to the Board of Supervisors. 85% · ordinance
- Is there a system-size cap on residential generation? No cap on residential rooftop generation. Table 8-2.1104 makes 'Small accessory use roof-mounted solar energy system (up to 10kW)' an Allowed use (A, zoning clearance only) in every zone including the residential RR-5, RR-2, R-L, R-M and R-H zones, and an 'Accessory solar energy system' (over 10 kW, under 2.5 acres) is ALSO an Allowed use in those same residential zones - so exceeding 10 kW changes the definition, not the permit path. The 10 kW AC / 30 kW thermal figure is a definitional boundary, not a limit. Real ceilings only bite on area: an accessory solar energy system 'shall occupy no more than seven and one-half (7.5) acres of land or twenty percent (20%) of the area of the parcel, whichever is smaller' (8-2.1104(g)(8)), 2.5-7.5 acres needs Site Plan Review, and anything exporting over 1 MW to the grid becomes a 'utility solar energy system'. 85% · ordinance
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Check who is allowed to apply
Several authorities require the electrical permit to be pulled by a licensed electrician, or require the contractor to be registered with them BEFORE applying. Registration is not same-day. This is second on the list rather than fourth because it is the step most likely to stop the job before the drawings matter.
- Who is allowed to pull the electrical permit? Either 85% · permit application form
- Must the contractor be registered with this authority before applying? No 70% · department page
- Is a homeowner permitted to self-install and self-permit? Yes 85% · permit application form
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Build the submittal package
Almost everywhere wants a site plan, a one-line or three-line electrical diagram, equipment cut sheets with listings, and a structural attachment detail. Build it against the published checklist rather than the last jurisdiction you worked in — the checklist is what the reviewer marks against.
- What documents make up a complete submittal? Application for Building Permit (8-page form, Rev Oct 23) plus a 'Rapid Review' plan set. For Solar Photovoltaic the application states the submittal must meet the requirement of one of the following: the SolarAPP+ Checklist, the California Solar Permitting Guidebook 4th Edition, or industry standard plans and specifications. A site plan and a location map are required by the Plans page. Manufacturer's installation instructions must be on site at inspection. Outside-agency forms are collected as applicable: Fire District Fee Form, Service District Form, School District Fee Form, FSA fee form, C&D recycling form, Land Use Review Survey (Environmental Health), Air District form. 80% · permit application form
- How many copies, and in what format? Rapid Review (which is what solar PV is): 11x17 plan sheets designed to be legible at that format, typically a single sheet or a small number of sheets. Full-size plans may be submitted but must then meet the Full Review formatting rules. For contrast, Full Review requires BOTH one paper set at 22x34 or larger, securely bound, AND PDFs on a USB-A flash drive, submitted in person or mailed to Building Plan Review, 292 W Beamer St, Woodland CA 95695. 80% · permit application form
- Is a site plan required, and what must it show? Yes, a site plan is required, and separately a location map. The Plans page exempts only 'minor work to existing structures, such as replacement of Electrical Service, Water Heater, HVAC, Sewer Lines, or Reroof' - solar PV is not on that list. A location map is required for all permits unless the work is on the only existing structure on a parcel under two acres, and must let the inspector drive safely to the site. Content requirements have to be taken from the Plan Review Guidelines PDF (minimum scale 1 inch = 20 feet, show the entire parcel, all recorded easements, distances to all property lines or nearest edge of road easements, all existing and proposed structures to scale including garage, well, shed, pool, HVAC equipment, septic system location, existing and proposed contours, storm run-off control) and from YCC 7-1.04(b) C105.1(2), which lists property lines, wells, septic systems, easements, power and telephone equipment, fuel storage tanks, drainage, private drives, access to public roads and features contributing to fire risk. 65% · department page + handout
- Is a one-line / three-line diagram required? Yes 65% · permit application form
- Are string and conductor calculations required? Yes 55% · permit application form
- Is a structural PE stamp required, and at what threshold? No county-published threshold. The application defers to a document called 'Building Design Authority' ('Designer - See Building Design Authority'; plan sheets 'required to be designed by a registered design professional must be signed by the registered design professional (See Building Design Authority)'), and that document is not published anywhere on the county site. In practice a conforming SolarAPP+ / California Solar Permitting Guidebook 4th Ed. submittal that meets the Guidebook structural criteria avoids engineering; anything outside it will be judged against the local design criteria the county does publish: Seismic Design Category D2 under the Residential Code and D under the Building Code, Wind Exposure C unless the CBO accepts an engineer's determination of Exposure B, wind speed 93 mph for Risk Category II (88 / 100 / 104 mph for Risk Categories I / III / IV), soil bearing 1500 psf, snow load 0 psf, rainfall 2 in/hr, Energy Climate Zone 12. 55% · department page + permit application form
- Is an electrical PE stamp required, and at what threshold? Not required, and no threshold is published. Nothing in YCC Title 7 Chapter 1, in YCC 8-2.1104 or in the Application for Building Permit requires an electrical PE stamp for a residential rooftop PV system. 60% · ordinance
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Apply and pay
Most authorities now take the whole application through a portal, and several states cap or constrain what a residential solar permit may cost. Check whether plan check is billed separately before you quote the job.
- Which permit portal does this authority use? Yolo Builds (Salesforce Experience Cloud / Clariti) at https://yolo.my.site.com - but it does NOT take building permits. Its login page states: 'Kindly note, Building Division permits and Planning Division applications won't be available on the online portal until further notice. Please reach out to building.division@yolocounty.gov for any questions on existing applications or submitting a new application.' It currently handles Public Works permits, licences and business-licence renewals only. Building permit applications go in by mail or in person at 292 W Beamer St, Woodland; inspections are booked through a separate web form on the department's Inspections page, or by phone or email. 85% · portal landing page
- Can the whole application be completed online? No 90% · portal landing page + permit application form
- What does a residential solar permit cost? $360.03 for a residential roof-mounted PV system up to 15 kW - $145.70 plan review plus $214.33 inspection - and above 15 kW add $5.46/kW (plan review) plus $5.81/kW (inspection) = $11.27 per kW. Add the county's 10% Technology Recovery Fee (Ordinance 1381) and the small state pass-throughs (California Building Standards Fee $4 based on valuation; State Seismic Fee 0.00013 x valuation, $0.50 minimum), giving roughly $396-$400 all-in for a typical system. Ground-mounted residential is the same tier table: $168.37 plan review + $490.81 inspection = $659.18 up to 15 kW, plus $16.17/kW above 15 kW, and Environmental Health separately charges $406.00 for a 'Minor Building Permit (Ground Mount Solar, Propane Tanks, Generators)'. 75% · adopted fee resolution exhibit + Board minutes
- How is the fee calculated? Tiered 85% · fee study staff report
- Is there a separate plan-check fee? Yes 80% · department page + fee schedule
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Plan review — and start the utility in parallel
Interconnection is a separate process from the permit and usually the longer pole. Where the utility does not depend on the permit being issued, running both at once is the single biggest saving available on a residential job.
- How long is an issued permit valid before it expires? 12 months to commence work, then void; and void if work is suspended or abandoned for 180 days after commencement. The CBO may grant one or more written extensions of not more than 180 days each, on written request with justifiable cause and an extension request review fee. Re-instating an expired permit costs one-half the fee for a new permit (provided plans are unchanged and the lapse has not exceeded one year). 90% · ordinance
- Which utility handles interconnection here? Pacific Gas and Electric Company (PG&E) 95% · CCA + utility source
- Where does the utility sit in the sequence? Parallel 85% · utility page
28 questions answered against Yolo County’s own published documents
Q1 Is this authority the AHJ for residential solar at this address? Core Jurisdiction & scope
Yes
Why the confidence is not higherYolo County Community Services / Building Division is the building and electrical AHJ for the unincorporated area. YCC 7-1.03 adopts CBC Chapter 1 Divisions I and II as the administrative provisions of Title 7 Chapter 1 and vests enforcement in the Chief Building Official. The department's own Permits page states any owner or authorized agent who intends to erect, install, alter, repair, remove, convert or replace any electrical system regulated by the Yolo County Building Standards Code must first apply to the building official.
department page + adopting ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/permits
Q2 What does this authority permit itself, and what does it delegate? Core Jurisdiction & scope
Both
Why the confidence is not higherThe Building Division permits and inspects building, electrical, mechanical and plumbing itself (YCC 7-1.02 adopts all of them; 7-1.06 adds only administrative provisions to the Electrical Code). Two things are held elsewhere: the Planning Division issues the Zoning Clearance required by YCC 8-2.1104(d)(4), and fire permits are delegated in six districts - the Permits page names Davis, East Davis, Springlake, West Sacramento, Winters and Woodland as administering their own fire permits, with all other districts routed to Community Services. Nothing about rooftop PV is delegated to a third party.
department page + ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/permits
Q3 Is a permit required for a residential rooftop PV system? Core Jurisdiction & scope
Yes
Why the confidence is not higherSolar PV is not in the permit-exempt lists the Permits page enumerates (CRC 105.2, CBC 105.2, the YCC 7-1.04 agricultural-building exemption, CEC/CMC/CPC exemptions). YCC 8-2.1104(c) states affirmatively that these solar energy systems require the issuance of a Building Permit, a Site Plan Review, or a Use Permit, and 8-2.1104(d)(4) routes small accessory-use roof-mounted systems to a Building Permit plus Zoning Clearance. Note for this agricultural county: the YCC 7-1.04(b) C105 permit-exempt agricultural building provision is limited to Group U agricultural buildings in A-N/A-X zones and expressly says at C105(4) that all electrical work is under a separate permit - it does NOT reach residential rooftop PV.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Q4 Is there a separate electrical permit, or is it combined? Core Jurisdiction & scope
Combined
Why the confidence is not higherOne 'Application for Building Permit' covers all work regulated by the CBC/CRC including trades; the form has a single work-scope block with a 'Trades / Miscellaneous' option. The fee, however, sits under the Electrical sub-label - the adopted 2026-27 line is 'Elc Solar PV Roof Mount Tier A (0-50kW)', and the old line was 'Photovoltaic/Solar System, Residential - Roof mounted' under 'Electrical Fee'. So it is one application producing what the county books as an electrical permit; there is no separate electrical application to file.
permit application form + fee schedule checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q5 Who is allowed to pull the electrical permit? Core Who may apply
Either
Why the confidence is not higherThe Application for Building Permit contractor block asks for a CSLB License # and a company name, and offers a checkbox 'Owner-Builder (attach Owner-Builder form)'. So a CSLB-licensed contractor or the property owner as owner-builder may apply. The county publishes no rule restricting the electrical permit to a licensed electrician specifically.
permit application form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q6 Must the contractor be registered with this authority before applying? Core Who may apply
No
Why the confidence is not higherNo contractor registration programme is published anywhere on the Building Services pages; the application asks only for a CSLB licence number. There is a separate Yolo County business licence, but the Business License page frames it as applying to businesses 'located in unincorporated Yolo County' (YCC Title 12), which would not normally capture a solar contractor based in Sacramento or Davis. The application does have a 'Business Lic. #' field without saying it is mandatory - treat this as the residual uncertainty.
department page checked 2026-08-28 https://www.yolocounty.gov/business/business-licenses
Q7 Is a homeowner permitted to self-install and self-permit? Who may apply
Yes
Why the confidence is not higherThe Application for Building Permit contractor block offers 'Owner-Builder (attach Owner-Builder form)' and the submittal checklist lists an 'Owner-Builder Form' among common forms. Caveat worth knowing: that Owner-Builder form is NOT published - the Forms page document library returns 'No results found' for every category and carries the notice 'This section is being updated. Please reach out to building.division@yolocounty.gov if the form you are looking for is not available.'
permit application form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q8 What documents make up a complete submittal? Core Submittal package
Application for Building Permit (8-page form, Rev Oct 23) plus a 'Rapid Review' plan set. For Solar Photovoltaic the application states the submittal must meet the requirement of one of the following: the SolarAPP+ Checklist, the California Solar Permitting Guidebook 4th Edition, or industry standard plans and specifications. A site plan and a location map are required by the Plans page. Manufacturer's installation instructions must be on site at inspection. Outside-agency forms are collected as applicable: Fire District Fee Form, Service District Form, School District Fee Form, FSA fee form, C&D recycling form, Land Use Review Survey (Environmental Health), Air District form.
Why the confidence is not higherThe submittal requirements are inside the application PDF itself (pages 4-7), not on any web page - a solar installer reading only the website would miss them. Solar PV is explicitly categorised as 'Rapid Review', not 'Full Review', which is why the heavy Full Review package (22x34 paper set, USB drive, named Calcs_*.pdf files) does not apply. The county publishes no standalone solar submittal checklist: the Forms document library is empty.
permit application form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q9 How many copies, and in what format? Submittal package
Rapid Review (which is what solar PV is): 11x17 plan sheets designed to be legible at that format, typically a single sheet or a small number of sheets. Full-size plans may be submitted but must then meet the Full Review formatting rules. For contrast, Full Review requires BOTH one paper set at 22x34 or larger, securely bound, AND PDFs on a USB-A flash drive, submitted in person or mailed to Building Plan Review, 292 W Beamer St, Woodland CA 95695.
Why the confidence is not higherStraight from the application PDF's Rapid Review and Submittal Format sections. The paper-plus-USB requirement is a real constraint even for solar because there is no working online submittal route (see Q21) - the Yolo Builds portal states building permits are unavailable on it.
permit application form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q10 Is a site plan required, and what must it show? Core Submittal package
Yes, a site plan is required, and separately a location map. The Plans page exempts only 'minor work to existing structures, such as replacement of Electrical Service, Water Heater, HVAC, Sewer Lines, or Reroof' - solar PV is not on that list. A location map is required for all permits unless the work is on the only existing structure on a parcel under two acres, and must let the inspector drive safely to the site. Content requirements have to be taken from the Plan Review Guidelines PDF (minimum scale 1 inch = 20 feet, show the entire parcel, all recorded easements, distances to all property lines or nearest edge of road easements, all existing and proposed structures to scale including garage, well, shed, pool, HVAC equipment, septic system location, existing and proposed contours, storm run-off control) and from YCC 7-1.04(b) C105.1(2), which lists property lines, wells, septic systems, easements, power and telephone equipment, fuel storage tanks, drainage, private drives, access to public roads and features contributing to fire risk.
Why the confidence is not higherAUTHORING DEFECT WORTH FLAGGING: the Plans page says 'A site plan must include the following information:' and is then followed by an EMPTY bullet list - confirmed both in the raw HTML and in a rendered browser read. The content list simply is not there. The only published content list is the Plan Review Guidelines PDF, which is badly stale: it states the codes in effect are the '2007 California Building Code; 2007 California Plumbing Code; 2007 California Mechanical Code; 2007 California Electrical Code; 2007 California Fire Code' and still tells applicants to use ink only, no pencil, with wet signatures. It contains no mention of solar at all.
department page + handout checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/plans
Q11 Is a one-line / three-line diagram required? Core Drawings & calculations
Yes
Why the confidence is not higherNot stated as a county requirement in its own words. It is required by incorporation: the application requires the solar PV submittal to meet the SolarAPP+ Checklist, the California Solar Permitting Guidebook 4th Edition, or industry standard plans and specifications, and both named standards require a single-line electrical diagram. The county publishes no solar plan-check list of its own.
permit application form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q12 Are string and conductor calculations required? Drawings & calculations
Yes
Why the confidence is not higherSame incorporation-by-reference route as Q11 - string sizing, conductor ampacity and OCPD sizing are part of the SolarAPP+ checklist and of the Guidebook standard plan, so they arrive with a conforming submittal. The county's own Full Review file-naming convention includes 'Calcs_Electrical.pdf' for electrical calculations, but Full Review does not apply to solar. Confidence is deliberately low: the county never says the words.
permit application form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q13 Is a structural PE stamp required, and at what threshold? Core Engineering & stamps
No county-published threshold. The application defers to a document called 'Building Design Authority' ('Designer - See Building Design Authority'; plan sheets 'required to be designed by a registered design professional must be signed by the registered design professional (See Building Design Authority)'), and that document is not published anywhere on the county site. In practice a conforming SolarAPP+ / California Solar Permitting Guidebook 4th Ed. submittal that meets the Guidebook structural criteria avoids engineering; anything outside it will be judged against the local design criteria the county does publish: Seismic Design Category D2 under the Residential Code and D under the Building Code, Wind Exposure C unless the CBO accepts an engineer's determination of Exposure B, wind speed 93 mph for Risk Category II (88 / 100 / 104 mph for Risk Categories I / III / IV), soil bearing 1500 psf, snow load 0 psf, rainfall 2 in/hr, Energy Climate Zone 12.
Why the confidence is not higherThe 'Building Design Authority' cross-reference is a dead link in practice - probed /building-design-authority, /plans/building-design-authority, /design-authority and /permits/building-design-authority on the department path (all 404) and the Forms document library is empty. So the county names its own governing document and does not publish it. The design criteria above ARE published and are the numbers a structural reviewer will use.
department page + permit application form checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/plans
Q14 Is an electrical PE stamp required, and at what threshold? Engineering & stamps
Not required, and no threshold is published. Nothing in YCC Title 7 Chapter 1, in YCC 8-2.1104 or in the Application for Building Permit requires an electrical PE stamp for a residential rooftop PV system.
Why the confidence is not higherProved by absence in the places it would be: Title 7 Chapter 1 sections 7-1.00 through 7-1.13 were read in full (the only substantive local amendment to the Electrical Code, 7-1.06, merely adds the administrative provisions of 7-1.03), YCC 8-2.1104 was read in full, and the application's design-professional language points only at the unpublished 'Building Design Authority'.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9506
Q15 What does a residential solar permit cost? Core Fees
$360.03 for a residential roof-mounted PV system up to 15 kW - $145.70 plan review plus $214.33 inspection - and above 15 kW add $5.46/kW (plan review) plus $5.81/kW (inspection) = $11.27 per kW. Add the county's 10% Technology Recovery Fee (Ordinance 1381) and the small state pass-throughs (California Building Standards Fee $4 based on valuation; State Seismic Fee 0.00013 x valuation, $0.50 minimum), giving roughly $396-$400 all-in for a typical system. Ground-mounted residential is the same tier table: $168.37 plan review + $490.81 inspection = $659.18 up to 15 kW, plus $16.17/kW above 15 kW, and Environmental Health separately charges $406.00 for a 'Minor Building Permit (Ground Mount Solar, Propane Tanks, Generators)'.
Why the confidence is not higherTHE PUBLISHED FEE SCHEDULE IS WRONG AND WILL MISLEAD YOU. The 'Current Master Fee Schedule' PDF the county links from both its Permits page and its County Fees page is print-dated 12/12/2025 and was last uploaded 23 Jan 2026; it still shows the flat $290.00 'Photovoltaic/Solar System, Residential - Roof mounted' fee. That fee was DELETED. On 23 June 2026 the Board of Supervisors held the noticed public hearing and adopted the 2026-27 Master Fee Resolution (Resolution No. 26-87, Minute Order 26-52, 4:1 vote), approving all proposed Community Services fees EXCEPT four named exclusions - Window Installation/Replacement, HVAC Installation Residential, New Single Family Dwelling, and Re-Roof - which were referred back to the Budget Ad Hoc Subcommittee. The solar lines were not among the exclusions, so they were adopted, and the resolution says at clause 4 that the fees 'shall become effective immediately'. The staff report explains the restructure: 'Proposed revisions to solar fees were restructured to match size tiers that are used in AB 1124 (2021)', and 'these Application and/or Issuance fees will be incorporated into the new revised fees' - so the old separate $33 solar application fee and $56 issuance fee should no longer be added on top, which is the main residual uncertainty in the number. Cap check: Gov. Code 66015 allows $450 plus $15/kW above 15 kW; $360.03 base and $11.27/kW are inside it, and were clearly engineered to be. One open risk: the Planning Division fee schedule still carries 'Minor Building Permit Review, ABC Form Review $251.00' and 'Zoning Clearance $262.00', and YCC 8-2.1104(d)(4) requires a Zoning Clearance alongside the building permit; if either is actually charged on a rooftop PV permit the total would breach the 66015 cap. Nothing published says it is.
adopted fee resolution exhibit + Board minutes checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/39398/639172921226730000
Q16 How is the fee calculated? Core Fees
Tiered
Why the confidence is not higherPer-kW tiered as of the 23 June 2026 adoption: Tier A 0-50 kW, Tier B 50-250 kW, Tier C over 250 kW, each split into a plan review fee and an inspection fee, each a flat base plus a per-kW adder above the tier floor. Explicitly built to the AB 1124 (2021) size tiers. This replaced a flat fee ($290 roof-mount) and an hourly fee ($145/hr, 2-hour minimum, ground-mount). The staff report frames the whole Building Division update as 'an industry-wide shift away from valuation-based fees', which also keeps the county clear of Gov. Code 65850.55.
fee study staff report checked 2026-08-28 https://public.destinyhosted.com/agenda_publish.cfm?id=96561&mt=BOS&get_month=6&get_year=2026&dsp=agm&seq=16662&rev=0&ag=3934&ln=140693
Q17 Is there a separate plan-check fee? Fees
Yes
Why the confidence is not higherExplicitly separate line items: 'Elc Solar PV Roof Mount Tier A (0-50kW) Plan Review' $145.70 and 'Elc Solar PV Roof Mount Tier A (0-50kW) Inspection' $214.33. This matches the county's stated two-transaction model on the Permits page: 'The first transaction is for Application Fees to cover the cost of plan review for project approval. Once a permit application is approved, the second transaction is for Permit Fees to cover the cost of inspection activities.' YCC 7-1.04(a)(8) adds CBC 109.8 making plan review fees a separate charge in addition to permit fees.
department page + fee schedule checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/permits
Q18 What is the stated plan-review turnaround? Core Timeline & validity
Nothing published by this authority.
Where we lookedNo plan-review turnaround is stated anywhere. Looked in: the Building Services landing page; the Permits page (permit-required, exemptions, fire districts, fees narrative - no timelines); the Plans page (Plan Review Guidelines link, location map, site plan, local design criteria - no timelines); the Inspections page (which gives inspection turnaround only); the Permit Reports page; the Forms page and all fifteen of its document folders, every one of which returns 'No results found'; the Application for Building Permit PDF, which defines the review CATEGORIES - Over the Counter, Rapid Review (which is where Solar Photovoltaic sits) and Full Review - but attaches no number of days to any of them; the Plan Review Guidelines PDF (extracted with pdftotext; a 2007-code document with no timelines); and YCC Title 7 Chapter 1 sections 7-1.00 to 7-1.13 in full. The fee schedule offers an 'Expedited Plan Review' at 1.5 times the original plan review fee, which implies a normal queue but names no duration. California sets no statutory review deadline for solar, so nothing fills the gap from above. The only adjacent published number is a fee-study figure, not a service standard.
https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q19 How long is an issued permit valid before it expires? Timeline & validity
12 months to commence work, then void; and void if work is suspended or abandoned for 180 days after commencement. The CBO may grant one or more written extensions of not more than 180 days each, on written request with justifiable cause and an extension request review fee. Re-instating an expired permit costs one-half the fee for a new permit (provided plans are unchanged and the lapse has not exceeded one year).
Why the confidence is not higherYCC 7-1.04(a)(4) replaces CBC 105.5 in its entirety with exactly this language, and YCC 7-1.03 makes CBC Chapter 1 Division II the administrative provisions for every code in Title 7 Chapter 1, so it governs the electrical/solar permit too. Fee side: the 'Permit Extension Request' fee rose from $101.00 to $371.08 per permit in the 23 June 2026 adoption, and 'Plan Check Extension Request' from $76.00 to $371.08.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9368
Q20 Which permit portal does this authority use? Core Portal & process
Yolo Builds (Salesforce Experience Cloud / Clariti) at https://yolo.my.site.com - but it does NOT take building permits. Its login page states: 'Kindly note, Building Division permits and Planning Division applications won't be available on the online portal until further notice. Please reach out to building.division@yolocounty.gov for any questions on existing applications or submitting a new application.' It currently handles Public Works permits, licences and business-licence renewals only. Building permit applications go in by mail or in person at 292 W Beamer St, Woodland; inspections are booked through a separate web form on the department's Inspections page, or by phone or email.
Why the confidence is not higherThe department's own Building Services page links 'Online Permits' straight to yolo.my.site.com, so a reader would reasonably assume solar permits can be filed there. They cannot. The county's back-office system is Clariti - the application's internal 'Office Use Only / Intake Quality Control' pages instruct staff to 'Check the fees and reviews in Clariti'.
portal landing page checked 2026-08-28 https://yolo.my.site.com/
Q21 Can the whole application be completed online? Core Portal & process
No
Why the confidence is not higherTwo independent confirmations. (1) The Yolo Builds portal notice quoted at Q20 excludes Building Division permits until further notice. (2) The Application for Building Permit's Submittal Format section requires, for Full Review, BOTH a paper set and a USB-A flash drive 'submitted in person or mailed'; Rapid Review (solar) drops to 11x17 sheets but the application gives no electronic submission channel. Worth flagging against Gov. Code 65850.52 (SB 379), which mandates an online automated solar permitting platform for jurisdictions above the population thresholds - Yolo's unincorporated population is in the 5,000+ band. The county references the SolarAPP+ Checklist only as an acceptable plan standard, not as a permitting platform.
portal landing page + permit application form checked 2026-08-28 https://yolo.my.site.com/
Q22 Which utility handles interconnection here? Core Utility interconnection
Pacific Gas and Electric Company (PG&E)
Why the confidence is not higherPG&E is the distribution utility and the interconnecting utility for unincorporated Yolo County. Valley Clean Energy (VCE) is the Community Choice Aggregator and is GENERATION ONLY - it does not interconnect anything. VCE's own solar page states it plainly: 'PG&E charges you for transmission and delivery of electricity, and VCE charges you for electric generation, or the creation, of the electricity', and 'True-up occurs on the annual anniversary of your interconnection' under PG&E. VCE's service area is 'the cities of Woodland, Winters, and Davis, and unincorporated Yolo County'. A VCE customer's NEM enrolment is automatic and requires no separate application; the interconnection application, the meter, the AC-disconnect rules and Permission to Operate all sit with PG&E under CPUC Electric Rule 21.
CCA + utility source checked 2026-08-28 https://valleycleanenergy.org/rates-billing/vce-solar/
Q23 Where does the utility sit in the sequence? Core Utility interconnection
Parallel
Why the confidence is not higherPG&E's own sequence: the contractor 'Submits application to connect your system to the grid' while the design is being finalised, PG&E 'Reviews your interconnection application' and does an engineering review, then the county inspection happens ('To obtain a final building permit, your clean energy system must pass city or county inspections for safety and code compliance'), then PG&E 'Gives final permission to operate'. So the interconnection application runs alongside permitting, and only PTO is gated on the county's final. PG&E states PTO 'typically takes 5 to 10 business days, up to a maximum of 30 business days' after the final electrical clearance, faster by email if an email address was on the Interconnection Application. Nothing in Yolo County's ordinance or handouts conditions permit issuance on the utility.
utility page checked 2026-08-28 https://www.pge.com/en/clean-energy/solar/getting-started-with-solar.html
Q24 Is a HOA or architectural approval required first? Overlays & special cases
No
Why the confidence is not higherNothing in YCC 8-2.1104, YCC Title 7 Chapter 1 or the Application for Building Permit conditions a solar permit on HOA or architectural-committee approval; the county's own stated purpose at 8-2.1104(a)(4) is to 'streamline the solar permitting process that complies with the Solar Rights Act and AB 2188'. Gov. Code 65850.5(a) forbids the AHJ from making HOA approval a condition. The one architectural-style review that does exist in Yolo is the historic one at Q25, and it is a county process, not an HOA one.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Q25 Is there a historic-district review? Overlays & special cases
Yes, but narrowly - only on a designated Historic Landmark or a structure inside a designated Historic District, and even then rooftop solar does NOT go to the Historic Preservation Commission by default. YCC 8-11.105(b) lists 'solar collectors on roof' among the items that 'do not require review by the Historic Preservation Commission. Approval by the Planning, Public Works and Environmental Services Department will be issued upon approval of a building permit' - with a discretionary escape: 'The Department may refer applications to the Historic Preservation Commission as deemed reasonably necessary in the discretion of the Department Director.' If referred, the Commission (which is the Planning Commission wearing a second hat, per 8-11.103(a)) must decide within 90 days of filing, and no building permit may issue until it files a letter of approval. YCC 8-2.1104(d)(7) adds that solar on a designated Landmark or in a designated District 'may be permitted provided that the design of the facilities is consistent with the purposes of the Landmark or District designation'. On any property that is not designated, there is no historic review at all.
Why the confidence is not higherRead YCC Title 8 Chapter 11 sections 8-11.102 through 8-11.114 in full plus 8-2.1104(d)(7). The staff-level path is the one that will apply to almost every rooftop job; the Director-referral clause is the tail risk to know about.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-31390
Q26 Is a wind or windstorm certification required? Overlays & special cases
No
Why the confidence is not higherCalifornia has no windstorm-certification regime (no TDI/TWIA analogue). Yolo County publishes design wind speeds as design criteria only, on the Plans page: Exposure C unless the CBO accepts an engineer's determination of Exposure B, with 88 mph (Risk Category I), 93 mph (II), 100 mph (III) and 104 mph (IV). No separate certification, inspection or third-party sign-off exists. Searched Title 7 Chapter 1 in full and the department pages; there is no wind-certification provision.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/plans
Q27 Is a Specific Use Permit or Council approval ever required? Overlays & special cases
Only in one narrow, statutorily-framed case for residential rooftop. YCC 8-2.1104(d)(4): small accessory-use roof- and ground-mounted systems are approved in all zones by Building Permit plus Zoning Clearance, but 'consistent with Section 65850.5 of the California Government Code, if the Chief Building Official has a good faith belief that the solar energy system could have a specific, adverse impact upon the public health and safety, the Official may require the applicant to apply for a Use Permit. Such a Use Permit shall be considered by the Zoning Administrator according to the requirements of Section 65850.5.' 'Specific, Adverse Impact' is defined in 8-2.1104(b) as a significant, quantifiable, direct and unavoidable impact based on objective, identified, written public health or safety standards as they existed when the application was deemed complete. No Board or Planning Commission approval is ever required for residential rooftop. Larger systems escalate: accessory systems of 2.5-7.5 acres need Site Plan Review, medium-sized (7.5-30 acres) Site Plan Review or a Minor Use Permit, large-scale (over 30 acres) a Major Use Permit from the Planning Commission, and over 120 acres goes to the Board of Supervisors.
Why the confidence is not higherDirect from YCC 8-2.1104(d)(4), (d)(5), (d)(8), (d)(9) and Table 8-2.1104. The ordinance mirrors GC 65850.5 correctly, which is unusual and worth noting positively.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Q28 Is there a system-size cap on residential generation? Overlays & special cases
No cap on residential rooftop generation. Table 8-2.1104 makes 'Small accessory use roof-mounted solar energy system (up to 10kW)' an Allowed use (A, zoning clearance only) in every zone including the residential RR-5, RR-2, R-L, R-M and R-H zones, and an 'Accessory solar energy system' (over 10 kW, under 2.5 acres) is ALSO an Allowed use in those same residential zones - so exceeding 10 kW changes the definition, not the permit path. The 10 kW AC / 30 kW thermal figure is a definitional boundary, not a limit. Real ceilings only bite on area: an accessory solar energy system 'shall occupy no more than seven and one-half (7.5) acres of land or twenty percent (20%) of the area of the parcel, whichever is smaller' (8-2.1104(g)(8)), 2.5-7.5 acres needs Site Plan Review, and anything exporting over 1 MW to the grid becomes a 'utility solar energy system'.
Why the confidence is not higherRead Table 8-2.1104 and definitions in 8-2.1104(b) in full. The trap here is reading the '10 kW' definition as a cap - it is not; both rows are 'A' in residential zones.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Lines marked with a percentage were read off this authority’s own published documents. Unmarked guidance is general good practice, not this jurisdiction’s rule — always confirm against the authority before you submit.
Install 5 steps · 20 questions
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Build to the code editions actually in force here
The NEC edition a jurisdiction enforces is often a cycle behind the newest one published, and local amendments sit on top of it. Rapid shutdown, conductor sizing and labelling all change between editions, so the edition in force is the first thing to establish, not the last.
- Which NEC edition is in force? 2023 85% · adopting ordinance
- Which building code edition is in force? 2025 California Building Code and 2025 California Residential Code (Title 24 Parts 2 and 2.5), effective 1 January 2026, by operation of state law. The county's own adopting ordinance is two cycles behind: YCC 7-1.02(a) and (b) adopt the '2019 California Building Code, Volumes 1 and 2' and the '2019 California Residential Code' (Ord. 1521, eff. 18 June 2020), and the department's Permits page cites the 2022 editions. 85% · adopting ordinance
- Which fire code edition is in force? 2025 California Fire Code (Title 24 Part 9), effective 1 January 2026, by state law. YCC 7-1.02(h) adopts the '2019 California Fire Code' with appendices B, C, D, E, F, G and H; YCC 7-1.11 amends it. The Permits page cites CFC 2022 sections 105.5 and 105.6 for operational and construction permits. 85% · adopting ordinance
- Are there local amendments to any of the above? Yes 90% · adopting ordinance
- What is the installation judged against? The 2025 California Electrical Code (2023 NEC), Article 690 adopted with zero California amendment and zero Yolo amendment, plus YCC 8-2.1104(d)(3): 'Solar energy systems for producing electricity shall meet all applicable safety and performance standards established by the California Electrical Code, the Institute of Electrical and Electronics Engineers, and accredited testing laboratories such as Underwriters Laboratories and, where applicable, rules of the Public Utilities Commission regarding safety and reliability.' Administratively, YCC 7-1.06 folds the CBC Chapter 1 Division II provisions of YCC 7-1.03 into the Electrical Code. 85% · ordinance
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Fire access, setbacks and pathways
Ridge setbacks and roof access pathways are fire-service requirements and they constrain the array layout. They are the most common cause of a redesign after the fire department comments on a plan set.
- What ridge setback and access pathways are required? State requirements only, unamended: 2025 CFC Section 1205 and 2025 CRC R329 roof access, pathways and setbacks (ridge setback, pathways to and around the array, smoke-ventilation access). Yolo County has adopted no local amendment on fire pathways or setbacks. Note the ordinance names the 2019 CFC, in which the equivalent section is 1204, and the department's Permits page still cross-links CFC 2022; the live section number is 1205. Practical wrinkle for this county: whether the fire review is done by the county or by a fire district depends on the address - Davis, East Davis, Springlake, West Sacramento, Winters and Woodland fire districts administer their own fire permits, and YCC 7-1.11(b)(1) additionally lets any district contract with the county for fire and panic safety plan review and inspection under the CBO. 75% · adopting ordinance + department page
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Rapid shutdown
Which rapid-shutdown rule applies follows directly from the NEC edition in force, and the initiation device has to be at a location the fire service can reach and identify. This is inspected, and it is labelled.
- Is rapid shutdown required, and to which NEC edition? Yes - rapid shutdown per NEC 690.12 of the 2023 NEC, as adopted in the 2025 California Electrical Code effective 1 January 2026, including the module-level (1 ft / 80 V) inside-array boundary requirements. California adopts Article 690 with no amendment and Yolo adds none. 85% · adopting ordinance
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Labels and placards
The NEC sets a baseline for permanent markings at the service equipment and the disconnecting means. On top of that, an authority may specify its own wording, and the utility may specify more again. Where any of them writes its own text, a generic off-the-shelf label set will not pass — this is the detail most often fixed on a return visit.
- Which placards does this authority require at the service equipment? Yolo County specifies no placards of its own. What applies at the service equipment is (a) the unamended 2023 NEC set - 690.13(B) PV system disconnect marking, 690.54 interactive point-of-interconnection rating, 690.56(C) rapid shutdown label, 705.10 directory of all power sources at each service equipment location, 705.12(B)(3)(2) busbar/backfeed label where applicable, and 690.31(D) circuit marking - and (b) PG&E's own requirements, which are the ones with a written specification: a permanently attached, engraved phenolic or ANSI Z535.4 label on the front of the AC disconnect reading e.g. 'UTILITY AC DISCONNECT SWITCH', and, for a supply-side (line-side) interconnection ahead of the main breaker, 'an engraved placard (signage), indicating there is a line/supply side connection, installed on the metering equipment'. 70% · utility design standard + NEC edition in force
- Does the authority specify placard wording of its own? No 85% · ordinance
- Does it specify letter height, colour or material? Not by the county - Yolo specifies no letter height, colour or material. PG&E does, and its spec is the one to build to: labels 'shall be permanent and suitable for the environment and shall be engraved phenolic or comply with ANSI Z535.4. Lettering shall be a minimum 3/8" high and in all capitals.' The AC disconnect must carry 'permanently attached signage on the front that explains this is the ac disconnect switch for the generation. Example: "UTILITY AC DISCONNECT SWITCH"', plus marking or signage on the switch clearly indicating the open (off) and closed (on) positions. 85% · utility design standard
- Is a site plan / facility map placard required, and what must it show? Yes, but the requirement comes from the NEC and from PG&E, not from Yolo County. NEC 705.10 requires a permanent plaque or directory at each service equipment location denoting the location of all electric power source disconnecting means. PG&E 060559 adds two map obligations: 'When the disconnect switch is not grouped with the meter panel provide a map showing the location', and 'If a Net Generation Output Meter (NGOM) is installed provide proper labeling as described and a map showing the location if not grouped together with the other meter(s) and disconnect switch.' Yolo County specifies no facility-map placard of its own. 75% · utility design standard + NEC
- Does the UTILITY specify placards beyond the AHJ's? Yes. PG&E imposes two things beyond the NEC and beyond anything Yolo County requires. (1) For a supply-side / line-side interconnection ahead of the main breaker: 'A fusible AC disconnect switch is required for generator interconnections ahead of the main breaker (line/supply side connection) and after the meter. Also required is an engraved placard (signage), indicating there is a line/supply side connection, installed on the metering equipment.' (2) On the AC disconnect itself: permanently attached front signage identifying it as the generation AC disconnect ('UTILITY AC DISCONNECT SWITCH'), open/closed position marking, engraved phenolic or ANSI Z535.4, minimum 3/8 inch all-capital lettering, plus a location map where the disconnect or NGOM is not grouped with the meter. 85% · utility DG manual
- Where must the labels be placed? NEC-driven labels go at the service equipment / point of interconnection: the 705.10 power-source directory at each service equipment location, the 690.13(B) PV system disconnect marking at the disconnect, the 690.56(C) rapid shutdown label at the service equipment, and the 690.54 interactive-system rating at the point of interconnection. PG&E-driven labels go on the front of the AC disconnect enclosure, and - for a supply-side connection - an engraved placard on the metering equipment. The PG&E AC disconnect itself must be located 10 feet or less from and in line of sight of the PG&E meter, at the same grade level if outdoors, easily accessible to PG&E, and expressly not on any floor or level above grade, not on a roof, and not inside a room that is not an approved electric meter room. 80% · utility design standard + NEC
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Disconnect, storage and listed equipment
Where the AC disconnect must sit relative to the meter is usually the utility's rule, not the building department's. Battery storage frequently carries its own permit, its own inspection and its own fire conditions.
- Where must the AC disconnect be, relative to the meter? For a typical residential job, PG&E does NOT require one. Greenbook TD-7001M-06 Table 6-3 'Requirements for AC Disconnect Switches': inverter-based generators on a self-contained, socket-based meter panel of 320 amps or less continuous rating, single-phase - AC disconnect required: No. All other self-contained or transformer-rated meter panels, and all non-inverter-based generators - Yes. Footnote 1: an AC disconnect IS required for all K-base meter panels of any ampacity. Footnote 2: if one is installed anyway, it must be PG&E approved. Where a disconnect IS required, PG&E 060559 fixes the location: installed between the PG&E meter and all generation sources, isolating generation only and not customer loads; 10 feet or less from and in line of sight of the PG&E meter at the point of common coupling, easily seen from the meter panel; at the same grade level as the meter if outdoors; easily accessible to PG&E on request; lockable in the open position with a PG&E padlock (5/16-inch shaft, keyed locks not allowed); manually operated, gang-operated, with visible air-gap verification. Expressly NOT allowed on any floor or level above grade, on a roof, or inside a room that is not an approved electric meter room. Molded-case circuit breakers and pull-out disconnects are not acceptable. A FUSIBLE disconnect is required for a supply-side (line-side) connection ahead of the main breaker, together with the engraved line-side placard on the metering equipment. 85% · utility DG manual
- Must equipment be on a specific approved list? Yes - but by reference to national listing bodies and the CPUC, not to a county list. YCC 8-2.1104(d)(3): electricity-producing solar energy systems 'shall meet all applicable safety and performance standards established by the California Electrical Code, the Institute of Electrical and Electronics Engineers, and accredited testing laboratories such as Underwriters Laboratories and, where applicable, rules of the Public Utilities Commission regarding safety and reliability.' 8-2.1104(d)(2) additionally requires solar water-heating systems (domestic, commercial or pool) to be certified by an accredited listing agency as defined by the California Plumbing and Mechanical Code. Inverters must also be on the CPUC/CEC Rule 21 approved equipment list to interconnect with PG&E. Yolo County itself maintains no approved-equipment list. 80% · ordinance
- Are batteries permitted, and under what conditions? Yes, permitted, under state code with no local amendment. The governing provisions are 2025 CRC R330 (renumbered from R328) and 2025 CFC Chapter 12 / Section 1207 for residential energy storage - installation limits per unit and per location, listing to UL 9540 with UL 9540A test data where required, permitted locations (attached/detached garage, utility closet, storage/utility space, outdoors on an exterior wall, not in habitable spaces or sleeping rooms), separation distances, and smoke alarm/protection requirements. Yolo County has adopted no local ESS ordinance, no local amendment, and publishes no ESS handout. Note that YCC 8-2.1104(b) defines a 'solar energy system' to include storage ('used to provide for generation and/or storage of electricity from sunlight'), so an ESS paired with PV rides on the same zoning treatment and the same Building Permit plus Zoning Clearance path. 70% · adopting ordinance + fire code in force
- Is there a separate ESS permit or inspection? No 55% · fee schedule + department form
- Is a ground mount treated as a structure? Yes 80% · ordinance + fee schedule
- Is there a local rule on service upgrades or busbar sizing? No local rule. Service upgrades, busbar sizing and the 120% rule are governed by unamended NEC 705.12 / 2025 CEC. What the county does have is a fee: as of the 23 June 2026 adoption, 'Service Panel 400 amps or less' is $535.52 per permit and 'Service Panel 401 amps or more' is $799.08 per permit (replacing the old $290 / $434 / $434 tiers of 'Install, Alter, Add Services 0-325, 325-1,000 and over 1,001 amps'; the over-1,001-amp line was deleted). So a main-panel upgrade taken with a solar job is a separate, and now substantially more expensive, permit line. 75% · adopted fee resolution exhibit
- Is a specific mounting system or attachment spacing required? No specific mounting system or attachment spacing is required. The county names no approved racking, no rafter-attachment spacing and no standoff detail. Two things do constrain the design: the published local design criteria (Seismic Design Category D2 residential / D building, Wind Exposure C, 93 mph Risk Category II, soil bearing 1500 psf, snow load 0 psf), and the requirement that the manufacturer's installation instructions be on site and available to the inspector, with any deviation from approved plans requiring the inspector's approval and possibly a plan revision. 80% · department page + ordinance
20 questions answered against Yolo County’s own published documents
Q29 Which NEC edition is in force? Core Code editions in force
2023
Why the confidence is not higherTHIS AUTHORITY INVERTS THE PATTERN THE BRIEF ASKED ME TO TEST. Elsewhere in California the ordinance is current and the handouts are stale. In Yolo the ADOPTING ORDINANCE ITSELF is the stale document. YCC 7-1.02(c) - current text, supplement 2026 S-21, legislation current through Ord. 1584 effective 25 June 2026 - still adopts 'The 2019 California Electrical Code', i.e. the 2017 NEC, by Ord. 1521 effective 18 June 2020. It has never been updated through the 2022 or the 2025 cycle. The department's Permits page is one cycle less stale and cross-links the 2022 codes (CARC2022, CABC2022, CFC2022 on codes.iccsafe.org). The Plan Review Guidelines PDF is stale by three cycles and names the 2007 codes. What actually applies is the 2025 California Electrical Code (2023 NEC), effective 1 January 2026, under H&SC 18938(b), which makes the state code apply whether or not the local jurisdiction adopts it, and Article 690 is adopted in California with no amendment. Design and inspect to the 2023 NEC.
adopting ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9368
Q30 Which building code edition is in force? Core Code editions in force
2025 California Building Code and 2025 California Residential Code (Title 24 Parts 2 and 2.5), effective 1 January 2026, by operation of state law. The county's own adopting ordinance is two cycles behind: YCC 7-1.02(a) and (b) adopt the '2019 California Building Code, Volumes 1 and 2' and the '2019 California Residential Code' (Ord. 1521, eff. 18 June 2020), and the department's Permits page cites the 2022 editions.
Why the confidence is not higherSame finding as Q29 and from the same section. Practical consequence for solar: the 2025 renumbering means rooftop PV is now CRC R329 (was R324/R327) and ESS is R330 (was R328) - neither number appears anywhere in Yolo's ordinance or handouts, which still operate in 2019-code numbering. H&SC 18938(b) resolves it in favour of the 2025 edition.
adopting ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9368
Q31 Which fire code edition is in force? Code editions in force
2025 California Fire Code (Title 24 Part 9), effective 1 January 2026, by state law. YCC 7-1.02(h) adopts the '2019 California Fire Code' with appendices B, C, D, E, F, G and H; YCC 7-1.11 amends it. The Permits page cites CFC 2022 sections 105.5 and 105.6 for operational and construction permits.
Why the confidence is not higherRead YCC 7-1.11 in full. Its amendments are purely administrative - retitling the code, conflict resolution, the Planning Commission sitting as the board of appeals, plan check and re-inspection fee authority, and a clause letting a local fire protection district contract with the county for plan review and inspection under the CBO. There is NO local amendment to fire access, roof access pathways, setbacks or solar. So state CFC 1205 (renumbered from 1204) governs solar rooftop access unamended.
adopting ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9506
Q32 Are there local amendments to any of the above? Core Code editions in force
Yes
Why the confidence is not higherThere are local amendments, but NONE of them touch solar. Read YCC 7-1.00 through 7-1.13 in full. Substantively there is exactly one non-administrative amendment in the whole chapter: CRC R313.3.7.1 (added by YCC 7-1.05(b)(1)), requiring one exterior approved audible and visual notification device visible from the front of the residence, connected to each automatic residential sprinkler system - this is the 'flashing fire fighter notification device' the Permits page flags. Everything else is administrative: permit expiration (7-1.04(a)(4)), fee schedule authority, investigation fees, refunds, re-inspection and plan review fees, the Planning Commission as board of appeals, occupancy violations, plus the Group U permit-exempt agricultural building regime at CBC Appendix C105/C105.1. The Mechanical and Plumbing amendments only replace Table 104.5 with the Board's fee schedule; Energy, Historical Building and Green Building are adopted without amendment; the Electrical Code amendment adds only the administrative provisions. Also relevant: AB 130 (Stats. 2025 Ch. 22) has frozen new more-restrictive residential amendments from 1 Oct 2025 to 1 Jun 2031, so the picture will not change soon.
adopting ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9506
Q33 What is the installation judged against? Core Electrical
The 2025 California Electrical Code (2023 NEC), Article 690 adopted with zero California amendment and zero Yolo amendment, plus YCC 8-2.1104(d)(3): 'Solar energy systems for producing electricity shall meet all applicable safety and performance standards established by the California Electrical Code, the Institute of Electrical and Electronics Engineers, and accredited testing laboratories such as Underwriters Laboratories and, where applicable, rules of the Public Utilities Commission regarding safety and reliability.' Administratively, YCC 7-1.06 folds the CBC Chapter 1 Division II provisions of YCC 7-1.03 into the Electrical Code.
Why the confidence is not higherThe zoning ordinance (8-2.1104(d)(3)) is doing work the building ordinance does not - it is where the listing and CPUC obligations are actually written. Note the ordinance's own code reference is to the 2019 CEC; the 2025 edition applies under H&SC 18938(b).
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Q34 Is there a local rule on service upgrades or busbar sizing? Electrical
No local rule. Service upgrades, busbar sizing and the 120% rule are governed by unamended NEC 705.12 / 2025 CEC. What the county does have is a fee: as of the 23 June 2026 adoption, 'Service Panel 400 amps or less' is $535.52 per permit and 'Service Panel 401 amps or more' is $799.08 per permit (replacing the old $290 / $434 / $434 tiers of 'Install, Alter, Add Services 0-325, 325-1,000 and over 1,001 amps'; the over-1,001-amp line was deleted). So a main-panel upgrade taken with a solar job is a separate, and now substantially more expensive, permit line.
Why the confidence is not higherAbsence proved by reading YCC 7-1.06 and all of Title 7 Chapter 1 - the Electrical Code amendment adds administrative provisions only. The fee change comes from the adopted Exhibit 1 to the 2026-27 Master Fee Resolution; note again that the published Master Fee Schedule PDF still shows the superseded $290 figure.
adopted fee resolution exhibit checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/39398/639172921226730000
Q35 Is a specific mounting system or attachment spacing required? Structural & mounting
No specific mounting system or attachment spacing is required. The county names no approved racking, no rafter-attachment spacing and no standoff detail. Two things do constrain the design: the published local design criteria (Seismic Design Category D2 residential / D building, Wind Exposure C, 93 mph Risk Category II, soil bearing 1500 psf, snow load 0 psf), and the requirement that the manufacturer's installation instructions be on site and available to the inspector, with any deviation from approved plans requiring the inspector's approval and possibly a plan revision.
Why the confidence is not higherAbsence proved in the places it would live: Title 7 Chapter 1 amendments (read in full - nothing structural beyond the sprinkler notification device), YCC 8-2.1104(f) development standards (which regulate height above roof and setbacks, not attachment), and the Forms document library (empty). Height allowance worth knowing: 8-2.1104(f)(1) lets a PV array extend up to 5 feet above the roof surface even where that exceeds the zone height limit; 7 feet for solar water/pool heating.
department page + ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/plans
Q36 What ridge setback and access pathways are required? Core Fire pathways & setbacks
State requirements only, unamended: 2025 CFC Section 1205 and 2025 CRC R329 roof access, pathways and setbacks (ridge setback, pathways to and around the array, smoke-ventilation access). Yolo County has adopted no local amendment on fire pathways or setbacks. Note the ordinance names the 2019 CFC, in which the equivalent section is 1204, and the department's Permits page still cross-links CFC 2022; the live section number is 1205. Practical wrinkle for this county: whether the fire review is done by the county or by a fire district depends on the address - Davis, East Davis, Springlake, West Sacramento, Winters and Woodland fire districts administer their own fire permits, and YCC 7-1.11(b)(1) additionally lets any district contract with the county for fire and panic safety plan review and inspection under the CBO.
Why the confidence is not higherProved by reading YCC 7-1.11 in full - it contains only administrative amendments (title, conflicts, board of appeals, plan check and re-inspection fees) and no Chapter 12 solar provision. The section-number staleness is the pattern the brief predicted, here present in the ordinance as well as the handouts.
adopting ordinance + department page checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9506
Q37 Is rapid shutdown required, and to which NEC edition? Core Rapid shutdown
Yes - rapid shutdown per NEC 690.12 of the 2023 NEC, as adopted in the 2025 California Electrical Code effective 1 January 2026, including the module-level (1 ft / 80 V) inside-array boundary requirements. California adopts Article 690 with no amendment and Yolo adds none.
Why the confidence is not higherThe edition question is the whole answer here, and Yolo's ordinance will mislead you: YCC 7-1.02(c) still adopts the 2019 CEC (2017 NEC). H&SC 18938(b) makes the 2025 state edition apply regardless of what the county has adopted, so 2023 NEC 690.12 is what an installation is judged against. Yolo publishes nothing of its own on rapid shutdown - searched Title 7 Chapter 1 in full and the whole county code for solar and photovoltaic (2 photovoltaic hits, 19 solar hits, all in Title 8 zoning, Title 10 and one landscaping provision).
adopting ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9368
Q38 Which placards does this authority require at the service equipment? Core Labels Signage & labelling
Yolo County specifies no placards of its own. What applies at the service equipment is (a) the unamended 2023 NEC set - 690.13(B) PV system disconnect marking, 690.54 interactive point-of-interconnection rating, 690.56(C) rapid shutdown label, 705.10 directory of all power sources at each service equipment location, 705.12(B)(3)(2) busbar/backfeed label where applicable, and 690.31(D) circuit marking - and (b) PG&E's own requirements, which are the ones with a written specification: a permanently attached, engraved phenolic or ANSI Z535.4 label on the front of the AC disconnect reading e.g. 'UTILITY AC DISCONNECT SWITCH', and, for a supply-side (line-side) interconnection ahead of the main breaker, 'an engraved placard (signage), indicating there is a line/supply side connection, installed on the metering equipment'.
Why the confidence is not higherThe county's absence is proved: searched the full Yolo County Code (positive control 'electrical' returned 93 hits, fabricated control 'zzqqx' returned 0, both scoped to Yolo County only), read Title 7 Chapter 1 in full, and the Forms document library returns 'No results found' in every category. So every placard obligation here comes from the NEC and from PG&E, not from Yolo.
utility design standard + NEC edition in force checked 2026-08-28 https://www.pge.com/assets/pge/docs/about/doing-business-with-pge/060559.pdf
Q39 Does the authority specify placard wording of its own? Core Labels Signage & labelling
No
Why the confidence is not higherNo county-specified placard wording exists anywhere. Controls run in the same session: American Legal code search scoped to Yolo County returned 93 results for 'electrical' (positive control passed), 0 for 'zzqqx' (fabricated control passed), 19 for 'solar' and 2 for 'photovoltaic' - and every solar hit is a Title 8 zoning, Title 10 environment or landscaping provision, none about labelling. Title 7 Chapter 1 read section by section. The department Forms library is empty.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9506
Q40 Does it specify letter height, colour or material? Core Labels Signage & labelling
Not by the county - Yolo specifies no letter height, colour or material. PG&E does, and its spec is the one to build to: labels 'shall be permanent and suitable for the environment and shall be engraved phenolic or comply with ANSI Z535.4. Lettering shall be a minimum 3/8" high and in all capitals.' The AC disconnect must carry 'permanently attached signage on the front that explains this is the ac disconnect switch for the generation. Example: "UTILITY AC DISCONNECT SWITCH"', plus marking or signage on the switch clearly indicating the open (off) and closed (on) positions.
Why the confidence is not higherFrom PG&E Electric Design Standard 060559 Rev. 07 (3/25/2022), 'Disconnect Switch Requirements for Distributed Generation Customers', Labeling section, which is incorporated into both the Greenbook and the Distribution Interconnection Handbook. Extracted with pdftotext, not summarised. Note the 3/8 inch minimum is stricter than the NEC's general 'sufficiently durable' language, so it is the governing number in PG&E territory.
utility design standard checked 2026-08-28 https://www.pge.com/assets/pge/docs/about/doing-business-with-pge/060559.pdf
Q41 Is a site plan / facility map placard required, and what must it show? Core Labels Signage & labelling
Yes, but the requirement comes from the NEC and from PG&E, not from Yolo County. NEC 705.10 requires a permanent plaque or directory at each service equipment location denoting the location of all electric power source disconnecting means. PG&E 060559 adds two map obligations: 'When the disconnect switch is not grouped with the meter panel provide a map showing the location', and 'If a Net Generation Output Meter (NGOM) is installed provide proper labeling as described and a map showing the location if not grouped together with the other meter(s) and disconnect switch.' Yolo County specifies no facility-map placard of its own.
Why the confidence is not higherPG&E's map requirement is conditional - it is triggered only when the disconnect (or NGOM) is not grouped with the meter panel. On a typical residential job where everything is on one wall, the NEC 705.10 directory is the live requirement. County absence proved as at Q39.
utility design standard + NEC checked 2026-08-28 https://www.pge.com/assets/pge/docs/about/doing-business-with-pge/060559.pdf
Q42 Does the UTILITY specify placards beyond the AHJ's? Core Labels Signage & labelling
Yes. PG&E imposes two things beyond the NEC and beyond anything Yolo County requires. (1) For a supply-side / line-side interconnection ahead of the main breaker: 'A fusible AC disconnect switch is required for generator interconnections ahead of the main breaker (line/supply side connection) and after the meter. Also required is an engraved placard (signage), indicating there is a line/supply side connection, installed on the metering equipment.' (2) On the AC disconnect itself: permanently attached front signage identifying it as the generation AC disconnect ('UTILITY AC DISCONNECT SWITCH'), open/closed position marking, engraved phenolic or ANSI Z535.4, minimum 3/8 inch all-capital lettering, plus a location map where the disconnect or NGOM is not grouped with the meter.
Why the confidence is not higherGreenbook TD-7001M-06 section 6.3 (publication date 04/22/2026, effective date 06/22/2026, Rev 2026-04) for the supply-side placard, and Electric Design Standard 060559 Rev. 07 for the disconnect labelling. Both PDFs downloaded and extracted with pdftotext -layout, not summarised. Since VCE is generation-only, none of this changes for a VCE customer - the metering and interconnection hardware is all PG&E's.
utility DG manual checked 2026-08-28 https://www.pge.com/assets/pge/docs/account/service-requests/greenbook-manual-full.pdf
Q43 Where must the labels be placed? Core Labels Signage & labelling
NEC-driven labels go at the service equipment / point of interconnection: the 705.10 power-source directory at each service equipment location, the 690.13(B) PV system disconnect marking at the disconnect, the 690.56(C) rapid shutdown label at the service equipment, and the 690.54 interactive-system rating at the point of interconnection. PG&E-driven labels go on the front of the AC disconnect enclosure, and - for a supply-side connection - an engraved placard on the metering equipment. The PG&E AC disconnect itself must be located 10 feet or less from and in line of sight of the PG&E meter, at the same grade level if outdoors, easily accessible to PG&E, and expressly not on any floor or level above grade, not on a roof, and not inside a room that is not an approved electric meter room.
Why the confidence is not higherLocation rules quoted from PG&E 060559 'Location' section; label placement from the same document and from the 2023 NEC as adopted in the 2025 CEC. Yolo County publishes no label-placement rule of its own - the only county-side check is the general one on the Inspections page that plans, specifications and manufacturer's installation instructions be on site and that the installation match the approved plans.
utility design standard + NEC checked 2026-08-28 https://www.pge.com/assets/pge/docs/about/doing-business-with-pge/060559.pdf
Q44 Must equipment be on a specific approved list? Equipment listing
Yes - but by reference to national listing bodies and the CPUC, not to a county list. YCC 8-2.1104(d)(3): electricity-producing solar energy systems 'shall meet all applicable safety and performance standards established by the California Electrical Code, the Institute of Electrical and Electronics Engineers, and accredited testing laboratories such as Underwriters Laboratories and, where applicable, rules of the Public Utilities Commission regarding safety and reliability.' 8-2.1104(d)(2) additionally requires solar water-heating systems (domestic, commercial or pool) to be certified by an accredited listing agency as defined by the California Plumbing and Mechanical Code. Inverters must also be on the CPUC/CEC Rule 21 approved equipment list to interconnect with PG&E. Yolo County itself maintains no approved-equipment list.
Why the confidence is not higherDirect ordinance text. Worth noting it is the ZONING ordinance carrying the listing requirement, not the building ordinance - an installer reading only Title 7 would never find it.
ordinance checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Q45 Are batteries permitted, and under what conditions? Core Battery / ESS
Yes, permitted, under state code with no local amendment. The governing provisions are 2025 CRC R330 (renumbered from R328) and 2025 CFC Chapter 12 / Section 1207 for residential energy storage - installation limits per unit and per location, listing to UL 9540 with UL 9540A test data where required, permitted locations (attached/detached garage, utility closet, storage/utility space, outdoors on an exterior wall, not in habitable spaces or sleeping rooms), separation distances, and smoke alarm/protection requirements. Yolo County has adopted no local ESS ordinance, no local amendment, and publishes no ESS handout. Note that YCC 8-2.1104(b) defines a 'solar energy system' to include storage ('used to provide for generation and/or storage of electricity from sunlight'), so an ESS paired with PV rides on the same zoning treatment and the same Building Permit plus Zoning Clearance path.
Why the confidence is not higherAbsence proved: searched the full Yolo County Code scoped to Yolo (controls passed - 'electrical' 93 hits, 'zzqqx' 0 hits); read YCC 7-1.02 through 7-1.13 in full; no battery, ESS or energy-storage provision exists. The published Master Fee Schedule also has no battery or ESS line item. The R328-to-R330 renumbering the brief flagged is live here: Yolo's ordinance is still in 2019-code numbering and would point you at the wrong section.
adopting ordinance + fire code in force checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-9368
Q46 Is there a separate ESS permit or inspection? Battery / ESS
No
Why the confidence is not higherNo separate ESS permit type and no ESS fee exist in Yolo's published material. The Master Fee Schedule (73 pages, searched for battery, energy storage and ESS) has no storage line; the Building Inspection Request Form's inspection categories are Permit Final, Building, Demolition, Electrical, Grading, Manufactured Home or Commercial Coach, Mechanical, Plumbing and Pool/Spa, with no storage category; the June 2026 fee study added 60 new Building Division fees including six new solar PV tiers and none for storage. So an ESS is permitted and inspected under the electrical permit alongside the PV, and a fire review would be triggered through the county's normal fire routing (or the local fire district). Confidence is held down because the county says nothing explicit either way.
fee schedule + department form checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/43723/639047552483630000
Q47 Is a ground mount treated as a structure? Core Ground mount
Yes
Why the confidence is not higherA ground mount is treated as a structure with its own siting rules. It needs a Building Permit (YCC 8-2.1104(c) and (d)(4)). Setbacks: excluding the collection panels themselves, equipment may sit in required side and rear yards but no closer than 10 feet from any property line in agricultural, commercial, industrial and public/open-space zones and 5 feet in residential zones (8-2.1104(f)(3)); pole-mounted panels in residential zones follow the accessory-structure rules of 8-2.506(a) - maximum 10 feet high with a 5-foot rear-yard setback (8-2.1104(f)(4)). Larger accessory ground mounts must meet the full front, rear and side yard setbacks of the zone plus a 10-foot (5-foot residential) weed-control perimeter for Fire Code purposes, and the zone's height limit except for auxiliary equipment (8-2.1104(g)(4) and (g)(5)). One concession: 'The solar panels of a small accessory use ground-mounted solar energy system shall not be included in any calculation of impervious surface for purposes of calculating lot coverage' (8-2.1104(f)(5)). Cost differs sharply too - the adopted 2026-27 ground-mount fee is $168.37 plan review plus $490.81 inspection ($659.18 up to 15 kW, then $16.17/kW), and Environmental Health charges a further $406.00 'Minor Building Permit (Ground Mount Solar, Propane Tanks, Generators)'.
ordinance + fee schedule checked 2026-08-28 https://codelibrary.amlegal.com/codes/yolocounty/latest/yolo/0-0-0-29890
Q48 Where must the AC disconnect be, relative to the meter? Core Utility equipment
For a typical residential job, PG&E does NOT require one. Greenbook TD-7001M-06 Table 6-3 'Requirements for AC Disconnect Switches': inverter-based generators on a self-contained, socket-based meter panel of 320 amps or less continuous rating, single-phase - AC disconnect required: No. All other self-contained or transformer-rated meter panels, and all non-inverter-based generators - Yes. Footnote 1: an AC disconnect IS required for all K-base meter panels of any ampacity. Footnote 2: if one is installed anyway, it must be PG&E approved. Where a disconnect IS required, PG&E 060559 fixes the location: installed between the PG&E meter and all generation sources, isolating generation only and not customer loads; 10 feet or less from and in line of sight of the PG&E meter at the point of common coupling, easily seen from the meter panel; at the same grade level as the meter if outdoors; easily accessible to PG&E on request; lockable in the open position with a PG&E padlock (5/16-inch shaft, keyed locks not allowed); manually operated, gang-operated, with visible air-gap verification. Expressly NOT allowed on any floor or level above grade, on a roof, or inside a room that is not an approved electric meter room. Molded-case circuit breakers and pull-out disconnects are not acceptable. A FUSIBLE disconnect is required for a supply-side (line-side) connection ahead of the main breaker, together with the engraved line-side placard on the metering equipment.
Why the confidence is not higherBoth PDFs downloaded and read with pdftotext -layout. The Greenbook is the 2026 edition (publication 04/22/2026, effective 06/22/2026, Rev 2026-04); 060559 is Rev. 07 dated 3/25/2022. The '320 amps or less, single-phase, socket-based' exemption is the single most commonly-misstated fact in PG&E territory and covers most residential rooftop PV, so it is worth carrying precisely.
utility DG manual checked 2026-08-28 https://www.pge.com/assets/pge/docs/account/service-requests/greenbook-manual-full.pdf
Lines marked with a percentage were read off this authority’s own published documents. Unmarked guidance is general good practice, not this jurisdiction’s rule — always confirm against the authority before you submit.
Inspection 5 steps · 14 questions
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Book it
Booking is a portal, a phone call or an email depending on the authority, and the notice required is rarely zero. Book before the work is finished rather than after — the lead time, not the work, is usually what sets the date.
- How is an inspection booked? Email 85% · department page
- How much notice is required? 1 business day - requests must be submitted by 2:00 pm the day before. 'For requests submitted by 2:00 p.m. the next available date is typically the next business day. We will respond to confirm your date as quickly as we can. A few times per year the next available is 2-3 business days out due to high demand, so we encourage you to schedule early whenever possible.' A 'future date' request may be submitted while work is still in progress, and should be 2 or more days ahead. Requests falling on a county holiday are scheduled for the following business day; Yolo Builds observes New Year's Day, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Veterans Day, Thanksgiving Day, the day after Thanksgiving, and Christmas Eve to New Year's Day. 90% · department page
- Are same-day or AM/PM windows offered? No AM/PM windows and no same-day service are offered or published. The request form's only timing choices are 'Next available' or 'Future date' plus a requested date; there is no time-window field. A 'next available' request 'requires the work to be ready for inspection at the time of the request', and the 2:00 pm previous-day cutoff rules out same-day booking. The county confirms the date back to the requester rather than offering a slot. 75% · department page
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Know who turns up
Some authorities inspect their own solar work; some delegate it, and a few do not inspect the PV equipment itself at all. Who is coming determines what they will look at.
- Does this AHJ perform its own final solar inspection? Yes 90% · department page + ordinance
- If delegated, to whom? Not applicable for solar - nothing is delegated. The only delegation in Yolo's system is on the FIRE side and does not touch a residential rooftop PV permit: the Davis, East Davis, Springlake, West Sacramento, Winters and Woodland fire districts administer their own fire permits, and YCC 7-1.11(b)(1) lets any local fire protection district enter an agreement with the county to do fire and panic safety plan review and inspection under the authority of the Chief Building Official. 80% · department page + ordinance
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Work the stages in order
A rough-in or mid-roof inspection, where one is required, has to happen before the work it covers is closed up. Missing a stage means opening something back up, and it is the most expensive kind of correction.
- Which inspections are required, and in what order? One consolidated inspection for an eligible small residential rooftop PV system. Gov. Code 65850.5 (AB 2188) entitles an eligible small residential rooftop solar system to a single inspection, and the county's whole approach reinforces it: 'It is acceptable and expected to combine inspections whenever possible.' On the request form the installer selects the general category - the relevant ones are 'Electrical' and '** Permit Final **' - and the form instructs: 'If this inspection will close out the permit, select ** Permit Final ** AND the specific inspection category.' So a solar final is booked as Permit Final plus Electrical in one request. The full category list is: ** Permit Final **, Building, Demolition, Electrical, Grading, Manufactured Home or Commercial Coach, Mechanical, Plumbing, Pool/Spa. 70% · department page + state statute
- Is a rough-in or mid-roof inspection required? No 60% · permit application form + department page
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Have the paperwork on site
The approved plan set, the permit, and the equipment listings should be on site and reachable. Inspectors routinely verify that installed equipment matches what was approved, and that the labels are the ones the plan set promised.
- Is there a published inspection checklist? No 80% · department page
- What must be on site at inspection? The approved permit; the inspection card; the approved plans including any approved revisions; specifications; and the manufacturer's installation instructions. All of the work to be inspected must be complete before calling for inspection, and must remain accessible and exposed for inspection until approved. If the inspector arrives and the work is not ready, a re-inspection fee is charged. 90% · department page
- Does the inspector verify labels and listings? Yes 70% · department page + ordinance
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Sign-off, and permission to operate
Passing gives you a final or an equivalent sign-off. That is not the same as permission to operate: PTO comes from the utility, and who tells the utility the inspection passed varies. A system left switched off for weeks is usually waiting on this handover.
- What is issued on pass? Final 75% · department page
- Who notifies the utility for PTO? Installer 80% · utility DG page
- Is there a re-inspection fee? $135.97 per inspection trip 75% · adopted fee resolution exhibit + ordinance
- How are corrections issued and cleared? Corrections are issued by the inspector on site against the approved plans and recorded on the inspection card; work must not proceed past the current inspection until it is approved ('No. Do not work past the current inspection until the inspection is approved.'). Any deviation from the approved plans must be approved by the inspector, and the inspector may require a plan revision to be submitted before approval. To clear corrections the applicant calls and schedules a re-inspection and, where a re-inspection fee has been assessed, pays it - no additional inspection is performed until the fee is paid. Cancel or modify a booking through the same request form ('Cancel or modify an inspection request') as soon as possible if you will not be ready. Determinations by the CBO can be appealed in writing within 30 days to the Planning Commission sitting as the board of appeals (YCC 7-1.04(a)(10)), and onward to the Board of Supervisors within 15 days. 75% · department page + ordinance
14 questions answered against Yolo County’s own published documents
Q49 How is an inspection booked? Core Booking & scheduling
Why the confidence is not higherThe department states 'Currently, inspections must be scheduled in person, by phone, or email' - explicitly NOT through the Yolo Builds portal, which does not carry Building Division permits at all. In practice the primary channel is the online Building Inspection Request Form on the Inspections page, which emails the request in: it captures name, email, phone, permit number, project location, description, request type (new / cancel or modify), details, onsite contact and phone, requested-for (next available or future date), a 'ready for inspection' confirmation, requested date, inspection category and notes. Phone is 530-666-8037; email building.division@yolocounty.gov.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q50 How much notice is required? Core Booking & scheduling
1 business day - requests must be submitted by 2:00 pm the day before. 'For requests submitted by 2:00 p.m. the next available date is typically the next business day. We will respond to confirm your date as quickly as we can. A few times per year the next available is 2-3 business days out due to high demand, so we encourage you to schedule early whenever possible.' A 'future date' request may be submitted while work is still in progress, and should be 2 or more days ahead. Requests falling on a county holiday are scheduled for the following business day; Yolo Builds observes New Year's Day, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Veterans Day, Thanksgiving Day, the day after Thanksgiving, and Christmas Eve to New Year's Day.
Why the confidence is not higherVerbatim from the Inspections page and the inspection request form's inline help. The Christmas Eve to New Year's Day closure is a full week and is easy to miss when planning a December PTO date.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q51 Are same-day or AM/PM windows offered? Booking & scheduling
No AM/PM windows and no same-day service are offered or published. The request form's only timing choices are 'Next available' or 'Future date' plus a requested date; there is no time-window field. A 'next available' request 'requires the work to be ready for inspection at the time of the request', and the 2:00 pm previous-day cutoff rules out same-day booking. The county confirms the date back to the requester rather than offering a slot.
Why the confidence is not higherRead the rendered inspection request form field by field in a browser (the form is JavaScript-rendered and does not appear in the raw HTML). Absence of a window field is the evidence; the county never states 'no windows' in words. The new fee structure implies routing rather than windows: adopted 23 June 2026 are 'Inspection, Standard Stop on Route' $135.97, 'Inspection, Upgrade Stop' $203.96 and 'Inspection, Special Stop' $339.93 per trip, with the staff report explaining the distinction as 'an inspection that is on the route versus one that requires a special trip due to time constraints'. So asking for a specific time is likely to be chargeable.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q52 Does this AHJ perform its own final solar inspection? Core Who inspects
Yes
Why the confidence is not higherYolo County Building Division inspectors perform the inspections. YCC 7-1.03 vests enforcement in the Chief Building Official; the department runs its own inspection request form, its own inspection categories and its own inspection-trip fee schedule (Standard Stop on Route, Upgrade Stop, Special Stop), and publishes monthly 'Permits Issued or Finaled' reports. Nothing is contracted out for building or electrical.
department page + ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q53 If delegated, to whom? Core Who inspects
Not applicable for solar - nothing is delegated. The only delegation in Yolo's system is on the FIRE side and does not touch a residential rooftop PV permit: the Davis, East Davis, Springlake, West Sacramento, Winters and Woodland fire districts administer their own fire permits, and YCC 7-1.11(b)(1) lets any local fire protection district enter an agreement with the county to do fire and panic safety plan review and inspection under the authority of the Chief Building Official.
Why the confidence is not higherThe delegation direction is worth stating precisely because it runs the opposite way to the usual pattern: districts take work FROM the county in six named areas, and can also contract to do county work under the CBO. Building and electrical inspection is never delegated.
department page + ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/permits
Q54 Which inspections are required, and in what order? Core Stages & sequence
One consolidated inspection for an eligible small residential rooftop PV system. Gov. Code 65850.5 (AB 2188) entitles an eligible small residential rooftop solar system to a single inspection, and the county's whole approach reinforces it: 'It is acceptable and expected to combine inspections whenever possible.' On the request form the installer selects the general category - the relevant ones are 'Electrical' and '** Permit Final **' - and the form instructs: 'If this inspection will close out the permit, select ** Permit Final ** AND the specific inspection category.' So a solar final is booked as Permit Final plus Electrical in one request. The full category list is: ** Permit Final **, Building, Demolition, Electrical, Grading, Manufactured Home or Commercial Coach, Mechanical, Plumbing, Pool/Spa.
Why the confidence is not higherThe single-inspection entitlement is state law rather than a published county rule - Yolo publishes no solar-specific inspection sequence. The category mechanics come from reading the rendered form. Do not work past a failed stop: 'No. Do not work past the current inspection until the inspection is approved.'
department page + state statute checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q55 Is a rough-in or mid-roof inspection required? Stages & sequence
No
Why the confidence is not higherNo rough-in or mid-roof inspection is published for rooftop PV, and none would be expected under the single-inspection rule of Gov. Code 65850.5. The county's stated posture is to combine ('it is typical for Rough Electrical, Rough Mechanical, Rough Plumbing, and Framing to all be inspected on a single inspection'). By contrast the county DOES require two stops for a re-roof (Roof Deck Nail and Final) and for stucco/siding - so it clearly imposes mid-work stops where it thinks they are needed, and does not do so for solar. Confidence held down because there is no explicit statement about solar.
permit application form + department page checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/77445/639013975987100000
Q56 Does the inspector verify labels and listings? Core What is checked
Yes
Why the confidence is not higherImplied by the county's stated inspection rules rather than by a solar-specific checklist: 'The approved permit, inspection card, and plans, including any approved revisions, must be onsite and available to the inspector before the inspection can start. Any deviations from the approved plans must be approved by the inspector', and manufacturer's installation instructions are on the required-on-site list - which is the document an inspector uses to verify a listed and labelled assembly. YCC 8-2.1104(d)(3) makes NRTL listing a substantive requirement the inspector is enforcing. There is no published statement that labels are checked line by line.
department page + ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q57 Is there a published inspection checklist? Core What is checked
No
Why the confidence is not higherThere is no published inspection checklist of any kind, let alone a solar one. Looked in: the Inspections page (general rules only), the Plans page (design criteria and an empty site-plan list), the Permits page (permit-required and fee narrative), the Forms page and every one of its document folders - Accessibility, Building (Existing), Building (New), Demolition, Electrical, Egress, Fire, Flood, FSA, Grading, Mechanical, Plumbing, Pool & Spa, Structural, WUI - each of which renders 'No results found' under the notice 'This section is being updated. Please reach out to building.division@yolocounty.gov if the form you are looking for is not available.' The entire published document set for this division is seven files: Application for Ag Exempt, Application for Building Permit, Flood Zone Determination Request Form, Flood Review, and three Integrated Waste Management spreadsheets. The Plan Review Guidelines PDF is the only other handout and it is a 2007-code single-family-dwelling document with no solar content.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/forms
Q58 What must be on site at inspection? Core Documents on site
The approved permit; the inspection card; the approved plans including any approved revisions; specifications; and the manufacturer's installation instructions. All of the work to be inspected must be complete before calling for inspection, and must remain accessible and exposed for inspection until approved. If the inspector arrives and the work is not ready, a re-inspection fee is charged.
Why the confidence is not higherVerbatim from the Inspections page, stated twice - once under 'Am I Ready to Schedule an Inspection?' and again under 'Requirements for All Inspections'. The manufacturer's installation instructions requirement is the one most often missed on solar jobs and is explicit here.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q59 Is there a re-inspection fee? Corrections & re-inspection
$135.97 per inspection trip
Why the confidence is not higherAdopted 23 June 2026 as 'Re-Inspection Fee - for Late Cancellation or Not Ready', $135.97 per inspection trip, replacing the old '$145.00 per hour, minimum 1.5 hours' (i.e. $217.50 minimum) which the still-published Master Fee Schedule PDF continues to show. The trigger is defined in YCC 7-1.04(a)(8), adding CBC 109.7: a re-inspection fee may be assessed when the work scheduled is not complete or previously-called corrections are not complete, and it is expressly 'not to be interpreted as requiring re-inspection fees the first time a job is rejected for failure to comply' but rather to control calling for inspection before the job is ready. No further inspection of the work will be performed until the fee is paid.
adopted fee resolution exhibit + ordinance checked 2026-08-28 https://www.yolocounty.gov/home/showpublisheddocument/39398/639172921226730000
Q60 How are corrections issued and cleared? Corrections & re-inspection
Corrections are issued by the inspector on site against the approved plans and recorded on the inspection card; work must not proceed past the current inspection until it is approved ('No. Do not work past the current inspection until the inspection is approved.'). Any deviation from the approved plans must be approved by the inspector, and the inspector may require a plan revision to be submitted before approval. To clear corrections the applicant calls and schedules a re-inspection and, where a re-inspection fee has been assessed, pays it - no additional inspection is performed until the fee is paid. Cancel or modify a booking through the same request form ('Cancel or modify an inspection request') as soon as possible if you will not be ready. Determinations by the CBO can be appealed in writing within 30 days to the Planning Commission sitting as the board of appeals (YCC 7-1.04(a)(10)), and onward to the Board of Supervisors within 15 days.
Why the confidence is not higherAssembled from the Inspections page, the request form, and CBC 109.7 / 113.4 as amended by YCC 7-1.04(a)(8) and (a)(10). The county publishes no correction-notice template or online correction-tracking - there is no portal for building permits.
department page + ordinance checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q61 What is issued on pass? Core Final sign-off & PTO
Final
Why the confidence is not higherThe permit is 'finaled' - the request form's closing category is '** Permit Final **' and the department's monthly reports are titled 'Permits Issued or Finaled'. No certificate of occupancy is issued for a solar permit (the county does have a separate $101.00 Certificate of Occupancy fee, which applies to occupancy work, not to a PV electrical permit). The approved final on the inspection card, and the corresponding permit record, is what the installer sends to PG&E as the final electrical clearance. There is no published green-tag or letter product.
department page checked 2026-08-28 https://www.yolocounty.gov/government/general-government-departments/community-services/building-inspection-services/inspections
Q62 Who notifies the utility for PTO? Core Final sign-off & PTO
Installer
Why the confidence is not higherPG&E's process puts it on the contractor: the contractor 'Submits application to connect your system to the grid' and it is the interconnection customer who must submit the final electrical clearance - PG&E's NEM2 FAQ turns on whether customers 'have not submitted a final electrical clearance on or before 11:59 p.m. April 14, 2026'. PG&E then 'Gives final permission to operate', typically 5 to 10 business days, up to a maximum of 30 business days, faster by email if an email address was supplied on the Interconnection Application. Yolo County publishes nothing about notifying the utility and offers no AHJ-to-PG&E transmittal, so the installer carries it. PG&E's warning is worth repeating to customers: 'For safety reasons, don't turn on your system until PG&E gives you official written permission to operate it.' Valley Clean Energy plays no part - VCE NEM enrolment is automatic and follows the PG&E interconnection.
utility DG page checked 2026-08-28 https://www.pge.com/en/clean-energy/solar/getting-started-with-solar.html
Lines marked with a percentage were read off this authority’s own published documents. Unmarked guidance is general good practice, not this jurisdiction’s rule — always confirm against the authority before you submit.
Jurisdiction & key facts
The standing 62-question set, answered for Yolo County against this authority’s own published documents. Every answer carries the confidence it was recorded at and the document it came from. Where nothing is published we say so and show where we looked — a blank here is a finding, not a gap.
Jurisdiction unconfirmed
- Why not higher
- The brief's framing is correct that building sits in Community Services, but the department is not a standalone 'Building Department' - it is the Building Division inside the Department of Community Services, which also holds Planning, Environmental Health, Integrated Waste Management and (for most of the county) fire permitting. Two jurisdictional splits matter for solar: (1) the Planning Division, not Building, issues the Zoning Clearance that YCC 8-2.1104(d)(4) requires alongside the building permit; (2) fire permits are NOT held by the county in the Davis, East Davis, Springlake, West Sacramento, Winters and Woodland fire districts, which administer their own - everywhere else in the unincorporated county the fire permit is submitted to Community Services. Public Works holds encroachment permits only.
- Permit required
- Yes95%
- Permit cost
- $360.03 for a residential roof-mounted PV system up to 15 kW - $145.70 plan review plus $214.33 inspection - and above 15 kW add $5.46/kW (plan review) plus $5.81/kW (inspection) = $11.27…75%
- Portal
- Yolo Builds (Salesforce Experience Cloud / Clariti) at https://yolo.my.site.com - but it does NOT take building permits.85%
- Electrical code
- 202385%
- Own placard wording
- No85%
- Booking an inspection
- Email85%
Labels & placards for this authority
Wording 85%
No
Size, colour & material 85%
Not by the county - Yolo specifies no letter height, colour or material. PG&E does, and its spec is the one to build to: labels 'shall be permanent and suitable for the environment and shall be engraved phenolic or comply with ANSI Z535.4. Lettering shall be a minimum 3/8" high and in all capitals.' The AC disconnect must carry 'permanently attached signage on the front that explains this is the ac disconnect switch for the generation. Example: "UTILITY AC DISCONNECT SWITCH"', plus marking or signage on the switch clearly indicating the open (off) and closed (on) positions.
Where they go 80%
NEC-driven labels go at the service equipment / point of interconnection: the 705.10 power-source directory at each service equipment location, the 690.13(B) PV system disconnect marking at the disconnect, the 690.56(C) rapid shutdown label at the service equipment, and the 690.54 interactive-system rating at the point of interconnection. PG&E-driven labels go on the front of the AC disconnect enclosure, and - for a supply-side connection - an engraved placard on the metering equipment. The PG&E AC disconnect itself must be located 10 feet or less from and in line of sight of the PG&E meter, at the same grade level if outdoors, easily accessible to PG&E, and expressly not on any floor or level above grade, not on a roof, and not inside a room that is not an approved electric meter room.
What the utility wants on top 85%
Yes. PG&E imposes two things beyond the NEC and beyond anything Yolo County requires. (1) For a supply-side / line-side interconnection ahead of the main breaker: 'A fusible AC disconnect switch is required for generator interconnections ahead of the main breaker (line/supply side connection) and after the meter. Also required is an engraved placard (signage), indicating there is a line/supply side connection, installed on the metering equipment.' (2) On the AC disconnect itself: permanently attached front signage identifying it as the generation AC disconnect ('UTILITY AC DISCONNECT SWITCH'), open/closed position marking, engraved phenolic or ANSI Z535.4, minimum 3/8 inch all-capital lettering, plus a location map where the disconnect or NGOM is not grouped with the meter.
Each figure above is sourced and dated in the full answer set below (questions 38–43). Where an authority’s own published sheet is older than the code it has adopted, the answer says so.
Their website
Average approval time — application to PTO
From the CPUC interconnection record. Bars show the average days taken each year; a year with no recorded projects is left blank rather than drawn as zero.