Mono County
State of California
Mono County is a county authority in the State of California, covering 14 regions, serving 13,195 residents. 265 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. MCC §15.04.220 (Small Residential Rooftop Solar Energy Permit Expediting Ordinance) governs permitting of small residential rooftop solar systems, Q3 Electrical and building permits — Combined — the Consolidated Fee Schedule prices 'Solar Energy Systems' as a single line item (not separate Building vs Electrical fee lines), Q4 Where you file — No online/electronic permitting portal was identified. Residential PV is submitted on the county's 'Minor Building Permit Application' fillable PDF, Q20
- Permit required
- Yes. MCC §15.04.220 (Small Residential Rooftop Solar Energy Permit Expediting Ordinance) governs permitting of small residential rooftop solar systems,95% source
- What it costs
- $450 flat for a residential PV system up to 15 kW AC (or $450 flat for a residential thermal system up to 10 kWth),78% source
- Key document
- fee schedule cited by 4 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, but only for UNINCORPORATED Mono County. The Town of Mammoth Lakes (the county's only incorporated town) is a separate AHJ. 95% · department page
- What does this authority permit itself, and what does it delegate? Both Building AND Electrical, self-performed in-house by the Community Development Department's Building Division (offices in Mammoth Lakes and Bridgeport). No plan-check/inspection firm found: every named contact across all documents reviewed (Building Official Tom Perry, commdev@mono.ca.gov, department staff) is on the @mono.ca.gov domain, and no staffing-firm name, contractor-branded portal, or fee-schedule staffing appendix was found anywhere. Fire is fragmented: no county fire department exists; the county's own Building Official — not a fire marshal — is the codified enforcer of WUI/defensible-space compliance (§15.04.150) prior to occupancy, while actual fire suppression across unincorporated Mono is split among roughly six separate community fire protection districts/departments (Antelope Valley FPD, Bridgeport FD, Lee Vining FPD, June Lake FPD, Mono City FPD, Long Valley FD) plus CAL FIRE/USFS on federal land. 85% · adopting regulation + department page
- Is a permit required for a residential rooftop PV system? Yes. MCC §15.04.220 (Small Residential Rooftop Solar Energy Permit Expediting Ordinance) governs permitting of small residential rooftop solar systems, and the county's own 'Expedited Permit Process for Solar Photovoltaic (PV) Systems' document requires a completed building permit application for every PV installation. 95% · ordinance
- Is there a separate electrical permit, or is it combined? Combined — the Consolidated Fee Schedule prices 'Solar Energy Systems' as a single line item (not separate Building vs Electrical fee lines), and residential PV is submitted on the county's single 'Minor Building Permit Application' (the same form used for decks and other minor work), not as two separate permit applications. 68% · fee schedule
- Is a HOA or architectural approval required first? Yes, per the county's own (2014) Prescriptive Installation requirements: 'If the residence is located within the jurisdiction of a Homeowner's Association (HOA), written approval for the solar panel installation must be obtained. A copy of the written approval must be provided to the Building Division.' This is in direct tension with Civil Code §714 (Solar Rights Act), which bars conditioning solar-permit approval on HOA sign-off; the document predates and does not cite §714. Reported as written, not resolved. 75% · ordinance
- Is a wind or windstorm certification required? No TDI-style windstorm certification found, and no operative county wind-load design table/figure (e.g. a codified mph design-wind-speed number) was found anywhere in Title 15. MCC §15.04.020 (Express Findings) cites 'high winds' generically as one rationale for the chapter's local amendments, but no wind-load design criteria section follows anywhere in the codified chapter — unlike the adjacent county of Inyo, which codifies an explicit 85 mph sustained / 110 mph 3-second-gust county-wide wind criterion. 80% · ordinance
- Is a Specific Use Permit or Council approval ever required? Not for a standard residential rooftop PV retrofit. MCC §15.04.220's process is administrative/ministerial per Gov. Code §65850.5; a Conditional-Use-Permit-style process is only triggered if the Building Official makes a written finding, based on substantial evidence, that the specific installation would have a 'specific, adverse impact' on public health or safety with no feasible mitigation — a narrow, appealable exception rather than a routine requirement. No separate utility-scale/CUP-style renewable-energy ordinance comparable to neighboring Inyo County's Title 21 was found reaching ordinary residential PV in the materials reviewed. 70% · ordinance
- Is there a system-size cap on residential generation? Yes — the codified 'small residential rooftop solar energy system' definition caps eligibility for the ministerial/expedited process at 10 kW AC nameplate rating or 30 kW thermal, scoped to single- or duplex-family dwellings only. The county's separate Prescriptive Installation and Expedited Permit Process documents independently describe systems 'of 10kW or less' as the target of the standardized permit path. This is a cap on the EXPEDITED path's eligibility, not a hard ceiling on system size generally. 88% · 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? Electrical work itself must be performed by a licensed electrician (the county's own 2014 Prescriptive Installation requirements state plainly: 'Electrical installation shall be in conformance with the California Electrical Code (CEC). A licensed Electrician shall perform all electrical work.'). The overall building permit, however, may be pulled by a licensed contractor OR an owner-builder — the general Building Permit Application carries the standard California owner-builder declaration alongside the licensed-contractor declaration. 75% · ordinance
- Must the contractor be registered with this authority before applying? Not clearly mandated as a precondition of applying, but implied: the county's own Building Permit Application form has a distinct field for 'Mono County Business Lic. #' printed directly beside the state 'Contractor Lic. #' field, suggesting the county expects contractors to hold a county business license when applying. 55% · department page
- Is a homeowner permitted to self-install and self-permit? Yes. The county's own Building Permit Application contains a full Owner-Builder Declaration package (per Business & Professions Code §7044 and related disclosures), letting a homeowner self-install and pull their own permit. 85% · ordinance
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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? A complete submittal = (1) general building permit application (the 'Minor Building Permit Application' for PV), (2) Local Utility Approval — interconnection approval from the servicing utility company, (3) Design Documents — either the county's pre-approved prescriptive design forms (roof-mount or pole/ground-mount) or an engineer-stamped structural design where prescriptive eligibility isn't met, and (4) the supporting plan set called for in the Solar PV Standard Plan toolkit (roof/site layout diagram, electrical one-line-style plan, structural criteria, and fire-safety pathway diagram). 85% · published checklist
- Is a site plan required, and what must it show? Yes. A site plan/roof-layout diagram is required showing the roof layout of all panels and modules, clear access pathways, and the approximate locations of electrical disconnecting means and roof access points. 85% · checklist
- Is a one-line / three-line diagram required? Yes — a 'Solar PV Plan and supporting documentation' is required (Electrical Requirements, item E of the eligibility checklist), and the county's Solar PV Standard Plan toolkits (central-string-inverter and microinverter/ACM versions) each include a dedicated Roof Layout Plan sheet as part of the standardized submittal. 80% · checklist
- Are string and conductor calculations required? Yes, for the standardized/simplified path — the county's own Central String Inverter and Microinverter/ACM toolkits each contain conductor-sizing tables (e.g. ampacity tables factoring CEC 690.8 and 210.19(A)(1)) that the applicant must complete as part of the standard plan submittal. 80% · checklist
- Is a structural PE stamp required, and at what threshold? No single fixed kW/psf threshold — a structural PE stamp is required whenever the county's Prescriptive Installation eligibility criteria are NOT met (e.g., ground/pole-mounted systems, roof height over 40 ft, ground snow load conditions above the prescriptive limits, non-wood-frame roofs, mounting standoff over 12 in, adjustable or tracking systems). Separately, MCC §15.04.080 authorizes the Building Official to require engineering plan-check review — by in-house or contract engineers, at the Building Official's case-by-case discretion — whenever a submittal exceeds conventional light-frame code provisions for seismic design, wind load, or ground snow load. 85% · ordinance / checklist
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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? No online/electronic permitting portal was identified. Residential PV is submitted on the county's 'Minor Building Permit Application' fillable PDF, in person or by mail/email to the Building Division's Mammoth Lakes or Bridgeport offices. The site-wide CivicPlus 'Create a Website Account' login is a generic notification/account feature, not shown to be a permit-application or plan-review portal itself. 68% · portal landing page
- Can the whole application be completed online? No. No document or page shows an online path to complete the whole application; only downloadable fillable PDF forms plus in-person/mail submittal were found. 65% · portal
- What does a residential solar permit cost? $450 flat for a residential PV system up to 15 kW AC (or $450 flat for a residential thermal system up to 10 kWth), plus $15 per additional kW (or kWth) above that threshold with no upper cap — cited to Gov. Code §66015. NOTE A LIVE CONFLICT: the county's own 'Building Resources' page still actively links a 2014 Board of Supervisors Resolution (R14-10) advertised as a 'Waiver of Permit Fees for Alternative Energy Projects' for qualifying solar/ground-source projects up to $75,000 in valuation — but the resolution's actual operative text waives only the single then-standard $229 building-permit fee, not plan-check, SMIP, BSC, or any other fee, and it predates the current fee schedule by over a decade. Both documents are live and unreconciled. 78% · fee schedule
- How is the fee calculated? Tiered — a flat fee for the first capacity tier (15 kW AC for PV / 10 kWth for thermal), then an uncapped per-kW (or per-kWth) rate for capacity above that tier. 90% · fee schedule
- Is there a separate plan-check fee? No separate solar-specific plan-check fee line was found distinct from the flat/per-kW 'Solar Energy Systems' fee itself; the schedule's general 'Planning – Building Permit Plan Check' flat fees ($106 small / $265 large) exist for other permit types but were not shown tied to solar in any document reviewed. 55% · 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? Plan-check applications become void 180 days after the date of application. Issued building permits become void 36 months (3 years) after issuance unless a written extension is approved. Work must commence within 12 months of issuance, or be suspended/abandoned for 12 months, or the permit expires (Nov 1 - Apr 1 winter months are excluded from that 12-month clock due to climatic constraints). One extension of up to an additional 180 days is available at the Building Official's discretion. 92% · ordinance
- Which utility handles interconnection here? Southern California Edison (SCE) for most of the county — three major SCE transmission lines and 13 substations run through Mono County per the county/Town's own 2026 Multi-Jurisdictional Local Hazard Mitigation Plan, which also documents SCE's Public Safety Power Shutoff program operating countywide. BUT the same document states plainly that communities north of Walker Canyon on Hwy 395 — Walker, Coleville, and Topaz — 'received electrical service from Liberty Utilities (based out of Nevada)', a separate utility, not SCE. 92% · utility territory map + city source
- Where does the utility sit in the sequence? The utility touches the process at two separate points. BEFORE permit issuance: 'Local Utility Approval — Interconnection approval from servicing utility company' is listed as one of the four required items for a complete solar PV submittal. AFTER permit/at final: MCC §15.04.120 makes it unlawful for 'any person, including utility companies,' to make a PERMANENT electric connection to a structure requiring a permit until the county Building Division has approved final inspection — so permanent energization/PTO is legally gated on the county's own final inspection sign-off. 85% · ordinance
28 questions answered against Mono County’s own published documents
Q1 Is this authority the AHJ for residential solar at this address? Core Jurisdiction & scope
Yes, but only for UNINCORPORATED Mono County. The Town of Mammoth Lakes (the county's only incorporated town) is a separate AHJ.
Why the confidence is not higherCounty Building Division's own page states outright: 'The Mono County Building Division is responsible for the oversight and issuance of all building permits and associated work completed in the unincorporated areas of Mono County. We do not oversee or permit work within the Town of Mammoth Lakes.' Confirmed independently by MCC Title 19 §19.00.010 (development governed by the General Plan/area plans, county-wide) and by Mammoth Lakes' own separate Municode client (own Title 15 Buildings/Construction, own MLFPD fire-code adoption).
department page checked 2026-08-31 https://www.monocounty.ca.gov/1779/Building
Q2 What does this authority permit itself, and what does it delegate? Core Jurisdiction & scope
Both Building AND Electrical, self-performed in-house by the Community Development Department's Building Division (offices in Mammoth Lakes and Bridgeport). No plan-check/inspection firm found: every named contact across all documents reviewed (Building Official Tom Perry, commdev@mono.ca.gov, department staff) is on the @mono.ca.gov domain, and no staffing-firm name, contractor-branded portal, or fee-schedule staffing appendix was found anywhere. Fire is fragmented: no county fire department exists; the county's own Building Official — not a fire marshal — is the codified enforcer of WUI/defensible-space compliance (§15.04.150) prior to occupancy, while actual fire suppression across unincorporated Mono is split among roughly six separate community fire protection districts/departments (Antelope Valley FPD, Bridgeport FD, Lee Vining FPD, June Lake FPD, Mono City FPD, Long Valley FD) plus CAL FIRE/USFS on federal land.
Why the confidence is not higherBuilding Division page + Building Permit Application signature blocks (all @mono.ca.gov); Ordinance 22-18 §15.04.150 (Building Official enforces defensible-space/WUI standards); 2026 Mono County & Town of Mammoth Lakes Multi-Jurisdictional Local Hazard Mitigation Plan (963pp, June 2026) names the separate fire agencies by their own special-district annexes.
adopting regulation + department page checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/3266
Q3 Is a permit required for a residential rooftop PV system? Core Jurisdiction & scope
Yes. MCC §15.04.220 (Small Residential Rooftop Solar Energy Permit Expediting Ordinance) governs permitting of small residential rooftop solar systems, and the county's own 'Expedited Permit Process for Solar Photovoltaic (PV) Systems' document requires a completed building permit application for every PV installation.
Why the confidence is not higherCodified ordinance text, read directly (Ord. No. 22-18, § 1(Exh. A), 12-20-2022), plus the county's own process document naming the building permit application as a mandatory submittal item.
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.220SMREROSOENPEEXOR
Q4 Is there a separate electrical permit, or is it combined? Core Jurisdiction & scope
Combined — the Consolidated Fee Schedule prices 'Solar Energy Systems' as a single line item (not separate Building vs Electrical fee lines), and residential PV is submitted on the county's single 'Minor Building Permit Application' (the same form used for decks and other minor work), not as two separate permit applications.
Why the confidence is not higherConsolidated Fee Schedule (eff. 1 Jul 2025) 'Solar Energy Systems (per GC66015)' line items, and the Building Permit Applications page's own description: 'Minor building permit application: Use this application for projects such as decks, solar pv systems...' No document was found splitting a separate stand-alone electrical permit fee/application for PV.
fee schedule checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/651
Q5 Who is allowed to pull the electrical permit? Core Who may apply
Electrical work itself must be performed by a licensed electrician (the county's own 2014 Prescriptive Installation requirements state plainly: 'Electrical installation shall be in conformance with the California Electrical Code (CEC). A licensed Electrician shall perform all electrical work.'). The overall building permit, however, may be pulled by a licensed contractor OR an owner-builder — the general Building Permit Application carries the standard California owner-builder declaration alongside the licensed-contractor declaration.
Why the confidence is not higherMono County Prescriptive Design - Residential Solar Prescriptive Installation, item 19 (2014, still the linked document); 2026 Building Permit Application's dual Licensed Contractor's Declaration / Owner-Builder Declaration sections.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1454
Q6 Must the contractor be registered with this authority before applying? Core Who may apply
Not clearly mandated as a precondition of applying, but implied: the county's own Building Permit Application form has a distinct field for 'Mono County Business Lic. #' printed directly beside the state 'Contractor Lic. #' field, suggesting the county expects contractors to hold a county business license when applying.
Why the confidence is not higher2026 Building Permit Application form field layout; no separate ordinance provision was found making county business-license registration an explicit precondition to permit issuance (Title 5 Business Licenses was not exhaustively cross-checked against Building).
department page checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/3351
Q7 Is a homeowner permitted to self-install and self-permit? Who may apply
Yes. The county's own Building Permit Application contains a full Owner-Builder Declaration package (per Business & Professions Code §7044 and related disclosures), letting a homeowner self-install and pull their own permit.
Why the confidence is not higher2026 Building Permit Application, 'Owner-Builder Declaration' and 'Owner-Builder Acknowledgment and Information Verification Form' sections, read directly.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/3351
Q8 What documents make up a complete submittal? Core Submittal package
A complete submittal = (1) general building permit application (the 'Minor Building Permit Application' for PV), (2) Local Utility Approval — interconnection approval from the servicing utility company, (3) Design Documents — either the county's pre-approved prescriptive design forms (roof-mount or pole/ground-mount) or an engineer-stamped structural design where prescriptive eligibility isn't met, and (4) the supporting plan set called for in the Solar PV Standard Plan toolkit (roof/site layout diagram, electrical one-line-style plan, structural criteria, and fire-safety pathway diagram).
Why the confidence is not higherCounty's own 'Expedited Permit Process for Solar Photovoltaic (PV) Systems' document, p.4 'Submittal Requirements' list, read directly.
published checklist checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1321
Q9 How many copies, and in what format? Submittal package
Nothing published by this authority.
Where we lookedchecked the Expedited Permit Process document and the Minor Building Permit Application for a stated number-of-copies / format (paper size, PDF vs paper) requirement specific to solar submittals; none found
Q10 Is a site plan required, and what must it show? Core Submittal package
Yes. A site plan/roof-layout diagram is required showing the roof layout of all panels and modules, clear access pathways, and the approximate locations of electrical disconnecting means and roof access points.
Why the confidence is not higher'Expedited Permit Process for Solar Photovoltaic (PV) Systems', Fire Safety Requirements item D, read directly.
checklist checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1321
Q11 Is a one-line / three-line diagram required? Core Drawings & calculations
Yes — a 'Solar PV Plan and supporting documentation' is required (Electrical Requirements, item E of the eligibility checklist), and the county's Solar PV Standard Plan toolkits (central-string-inverter and microinverter/ACM versions) each include a dedicated Roof Layout Plan sheet as part of the standardized submittal.
Why the confidence is not higher'Expedited Permit Process for Solar Photovoltaic (PV) Systems' checklist; 'Solar PV Microinverter and ACM Simplified Tool Kit' §4.2 Roof Layout Plan, both read directly.
checklist checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1326
Q12 Are string and conductor calculations required? Drawings & calculations
Yes, for the standardized/simplified path — the county's own Central String Inverter and Microinverter/ACM toolkits each contain conductor-sizing tables (e.g. ampacity tables factoring CEC 690.8 and 210.19(A)(1)) that the applicant must complete as part of the standard plan submittal.
Why the confidence is not higher'Solar Pv Central String Inverter Simplified Tool Kit' and 'Solar Pv Microinverter And Acm Simplified Tool Kit', conductor tables, read directly.
checklist checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1327
Q13 Is a structural PE stamp required, and at what threshold? Core Engineering & stamps
No single fixed kW/psf threshold — a structural PE stamp is required whenever the county's Prescriptive Installation eligibility criteria are NOT met (e.g., ground/pole-mounted systems, roof height over 40 ft, ground snow load conditions above the prescriptive limits, non-wood-frame roofs, mounting standoff over 12 in, adjustable or tracking systems). Separately, MCC §15.04.080 authorizes the Building Official to require engineering plan-check review — by in-house or contract engineers, at the Building Official's case-by-case discretion — whenever a submittal exceeds conventional light-frame code provisions for seismic design, wind load, or ground snow load.
Why the confidence is not higher'Mono County Prescriptive Design - Residential Solar Prescriptive Installation' eligibility list (items 1-16) plus its Quick-Reference Flowchart; MCC §15.04.080 (Engineering plan check), read directly.
ordinance / checklist checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1454
Q14 Is an electrical PE stamp required, and at what threshold? Engineering & stamps
Nothing published by this authority.
Where we lookedchecked MCC §15.04.080 (Engineering plan check) and the Prescriptive Installation/PV toolkit documents for a distinct electrical-PE-stamp threshold separate from the general structural-engineering trigger; none stated
Q15 What does a residential solar permit cost? Core Fees
$450 flat for a residential PV system up to 15 kW AC (or $450 flat for a residential thermal system up to 10 kWth), plus $15 per additional kW (or kWth) above that threshold with no upper cap — cited to Gov. Code §66015. NOTE A LIVE CONFLICT: the county's own 'Building Resources' page still actively links a 2014 Board of Supervisors Resolution (R14-10) advertised as a 'Waiver of Permit Fees for Alternative Energy Projects' for qualifying solar/ground-source projects up to $75,000 in valuation — but the resolution's actual operative text waives only the single then-standard $229 building-permit fee, not plan-check, SMIP, BSC, or any other fee, and it predates the current fee schedule by over a decade. Both documents are live and unreconciled.
Why the confidence is not higherConsolidated Fee Schedule, effective 1 Jul 2025, 'Solar Energy Systems (per GC66015)' line items, read directly; cross-checked against Resolution No. R14-10 (11 Feb 2014, OCR'd from image-only scan) and its own webpage summary, which is still linked from the current Building Resources page.
fee schedule checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/651
Q16 How is the fee calculated? Core Fees
Tiered — a flat fee for the first capacity tier (15 kW AC for PV / 10 kWth for thermal), then an uncapped per-kW (or per-kWth) rate for capacity above that tier.
Why the confidence is not higherConsolidated Fee Schedule, effective 1 Jul 2025, read directly.
fee schedule checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/651
Q17 Is there a separate plan-check fee? Fees
No separate solar-specific plan-check fee line was found distinct from the flat/per-kW 'Solar Energy Systems' fee itself; the schedule's general 'Planning – Building Permit Plan Check' flat fees ($106 small / $265 large) exist for other permit types but were not shown tied to solar in any document reviewed.
Why the confidence is not higherConsolidated Fee Schedule, effective 1 Jul 2025, read in full; no distinct 'Solar Plan Check' line item found alongside the Solar Energy Systems lines.
fee schedule checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/651
Q18 What is the stated plan-review turnaround? Core Timeline & validity
Nothing published by this authority.
Where we lookedchecked the Building Division page, the Expedited Permit Process document, and the Consolidated Fee Schedule for a stated plan-review turnaround time (business days); none found
Q19 How long is an issued permit valid before it expires? Timeline & validity
Plan-check applications become void 180 days after the date of application. Issued building permits become void 36 months (3 years) after issuance unless a written extension is approved. Work must commence within 12 months of issuance, or be suspended/abandoned for 12 months, or the permit expires (Nov 1 - Apr 1 winter months are excluded from that 12-month clock due to climatic constraints). One extension of up to an additional 180 days is available at the Building Official's discretion.
Why the confidence is not higherMCC §15.04.060 (Building permit expiration), read directly from the codified ordinance text (Ord. 22-18).
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.060BUPEEX
Q20 Which permit portal does this authority use? Core Portal & process
No online/electronic permitting portal was identified. Residential PV is submitted on the county's 'Minor Building Permit Application' fillable PDF, in person or by mail/email to the Building Division's Mammoth Lakes or Bridgeport offices. The site-wide CivicPlus 'Create a Website Account' login is a generic notification/account feature, not shown to be a permit-application or plan-review portal itself.
Why the confidence is not higherBuilding Permit Applications page and the fillable PDF application forms it links, read directly; no eTRAKiT/Accela/SolarAPP+/OpenGov or similar branded portal link found anywhere on the Building Division's pages.
portal landing page checked 2026-08-31 https://www.monocounty.ca.gov/1781/Building-Permit-Applications
Q21 Can the whole application be completed online? Core Portal & process
No. No document or page shows an online path to complete the whole application; only downloadable fillable PDF forms plus in-person/mail submittal were found.
Why the confidence is not higherSame review as Q20.
portal checked 2026-08-31 https://www.monocounty.ca.gov/1781/Building-Permit-Applications
Q22 Which utility handles interconnection here? Core Utility interconnection
Southern California Edison (SCE) for most of the county — three major SCE transmission lines and 13 substations run through Mono County per the county/Town's own 2026 Multi-Jurisdictional Local Hazard Mitigation Plan, which also documents SCE's Public Safety Power Shutoff program operating countywide. BUT the same document states plainly that communities north of Walker Canyon on Hwy 395 — Walker, Coleville, and Topaz — 'received electrical service from Liberty Utilities (based out of Nevada)', a separate utility, not SCE.
Why the confidence is not higher2026 Mono County and Town of Mammoth Lakes Multi-Jurisdictional Local Hazard Mitigation Plan (963pp, dated 22 Jun 2026), Energy Shortage and Energy Resilience section, read directly ('pdftotext -layout' extraction, cross-checked against Figures 45/48 on SCE's own grid/circuit maps cited in the same document).
utility territory map + city source checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/3266
Q23 Where does the utility sit in the sequence? Core Utility interconnection
The utility touches the process at two separate points. BEFORE permit issuance: 'Local Utility Approval — Interconnection approval from servicing utility company' is listed as one of the four required items for a complete solar PV submittal. AFTER permit/at final: MCC §15.04.120 makes it unlawful for 'any person, including utility companies,' to make a PERMANENT electric connection to a structure requiring a permit until the county Building Division has approved final inspection — so permanent energization/PTO is legally gated on the county's own final inspection sign-off.
Why the confidence is not higher'Expedited Permit Process for Solar Photovoltaic (PV) Systems' Submittal Requirements list, item 2; MCC §15.04.120 (Utility connection), read directly.
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.120UTCO
Q24 Is a HOA or architectural approval required first? Overlays & special cases
Yes, per the county's own (2014) Prescriptive Installation requirements: 'If the residence is located within the jurisdiction of a Homeowner's Association (HOA), written approval for the solar panel installation must be obtained. A copy of the written approval must be provided to the Building Division.' This is in direct tension with Civil Code §714 (Solar Rights Act), which bars conditioning solar-permit approval on HOA sign-off; the document predates and does not cite §714. Reported as written, not resolved.
Why the confidence is not higher'Mono County Prescriptive Design - Residential Solar Prescriptive Installation', item 20, and its own Project Data form field 8 (HOA jurisdiction), read directly. Document dated New 2/2014, still the current linked document as of this check.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1454
Q25 Is there a historic-district review? Overlays & special cases
Nothing published by this authority.
Where we lookedMono County's actual Zoning Code is not codified on Municode (MCC Title 19 incorporates the General Plan and area/specific plans by reference rather than codifying a conventional zoning ordinance — confirmed by reading §19.00.010/.020/.030 in full); a historic-district/historic-review provision reaching residential PV, if any, would live in that separately-published Zoning Code or an Area Plan (e.g. the June Lake Area Plan), which could not be retrieved and searched directly from this network
Q26 Is a wind or windstorm certification required? Overlays & special cases
No TDI-style windstorm certification found, and no operative county wind-load design table/figure (e.g. a codified mph design-wind-speed number) was found anywhere in Title 15. MCC §15.04.020 (Express Findings) cites 'high winds' generically as one rationale for the chapter's local amendments, but no wind-load design criteria section follows anywhere in the codified chapter — unlike the adjacent county of Inyo, which codifies an explicit 85 mph sustained / 110 mph 3-second-gust county-wide wind criterion.
Why the confidence is not higherFull-text read of MCC Chapter 15.04 (all 24 sections): 'mph' = 0 hits; positive control 'electrical' = 16 hits; fabricated control 'zzqqx' = 0 hits, confirming the search worked and the absence is real rather than a retrieval failure.
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.020EXFI
Q27 Is a Specific Use Permit or Council approval ever required? Overlays & special cases
Not for a standard residential rooftop PV retrofit. MCC §15.04.220's process is administrative/ministerial per Gov. Code §65850.5; a Conditional-Use-Permit-style process is only triggered if the Building Official makes a written finding, based on substantial evidence, that the specific installation would have a 'specific, adverse impact' on public health or safety with no feasible mitigation — a narrow, appealable exception rather than a routine requirement. No separate utility-scale/CUP-style renewable-energy ordinance comparable to neighboring Inyo County's Title 21 was found reaching ordinary residential PV in the materials reviewed.
Why the confidence is not higherMCC §15.04.220(G)(4)-(5), read directly.
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.220SMREROSOENPEEXOR
Q28 Is there a system-size cap on residential generation? Overlays & special cases
Yes — the codified 'small residential rooftop solar energy system' definition caps eligibility for the ministerial/expedited process at 10 kW AC nameplate rating or 30 kW thermal, scoped to single- or duplex-family dwellings only. The county's separate Prescriptive Installation and Expedited Permit Process documents independently describe systems 'of 10kW or less' as the target of the standardized permit path. This is a cap on the EXPEDITED path's eligibility, not a hard ceiling on system size generally.
Why the confidence is not higherMCC §15.04.220(D)(2) definitions, read directly; corroborated by 'Expedited Permit Process for Solar Photovoltaic (PV) Systems' Purpose statement ('...residential solar photovoltaic single-phase systems of 10KW or less').
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.220SMREROSOENPEEXOR
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? 2020 NEC, adopted as the 2022 California Electrical Code (Title 24, Part 3), codified at MCC §15.04.030(C) via Ord. 22-18 (12-20-2022). This is the currently codified/operative edition, and is one full code cycle behind the 2023 NEC-based 2025 CEC that took effect statewide 1 Jan 2026 — the codification (through Ord. 25-006, Dec 2025 supplement) shows no amending ordinance to §15.04.030 since Dec 2022. 88% · adopting ordinance
- Which building code edition is in force? 2022 California Building Code and 2022 California Residential Code (Title 24 Parts 2 and 2.5), codified at MCC §15.04.030(B)/(K) via Ord. 22-18 (12-20-2022) — the currently operative edition, one cycle behind the 2025 CBC/CRC cycle that took effect statewide 1 Jan 2026 (same lag as Q29). 90% · adopting ordinance
- Which fire code edition is in force? 2022 California Fire Code (Title 24, Part 9), codified at MCC §15.04.030(H) via the same Ord. 22-18 — Mono County has no separate fire-code chapter or county fire department of its own; this Title 24 blanket adoption is the only county-level fire-code citation found. (The Town of Mammoth Lakes' own Fire Protection District separately adopted the 2022 California Fire Code by its own ordinance, consistent with the same cycle.) 85% · adopting ordinance
- Are there local amendments to any of the above? Yes. MCC §15.04.020 (Express Findings) states local amendments are 'reasonably necessary because of local climatic, geological or topographical conditions, including snow loads, freezing temperatures, high winds, and remote mountain terrain' — codified as the elevation-banded Mono County Snow Load Design Criteria (§15.04.140) and the defensible-space/WUI fire-hazard-reduction requirements (§15.04.150). As of 25 Feb 2026 the Building Official has additionally issued a formal policy authorizing continued use of the county's own snow-load criteria as an ASCE 7-22 'alternative method of construction' in lieu of the state-mandated Hazard Tool. 92% · ordinance
- What is the installation judged against? The 2022 Title 24 code suite (CBC/CRC/CEC/CFC — see Q29-31) PLUS Mono County's own local structural amendments: the codified elevation-banded Ground/Roof Snow Load Design Criteria table (MCC §15.04.140 — up to 285 psf ground / 220 psf roof snow load at the county's highest-elevation communities), and, as of 25 Feb 2026, the Building Official's own policy permitting continued use of that county table (rather than the state-mandated ASCE 7-22 Hazard Tool) as an 'alternative method of construction' under CBC §104.2.3, on the documented finding that the Hazard Tool overstates local ground snow loads by up to 135% for this terrain. 90% · 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? The standard, unamended 2022 CFC §605.11.1.2 / CRC R324.6 model rules apply, restated verbatim in the county's own PV Toolkit Inspection Guide: two minimum 36-inch-wide access pathways from eave to ridge on separate roof planes (at least one on the street/driveway side); a ridge setback of 18 inches where the array covers 33% or less of the roof plan area, or 36 inches where it covers more than 33% (reduced to 18%/66% thresholds where an NFPA 13D sprinkler system is installed). The county's own (2014) Prescriptive Installation document separately allows an alternate 12-inch ridge clearance for tile/metal-shingle roofing, or steep composition-shingle roofs, waivable to less with Fire Official approval where alternative smoke ventilation exists. No local amendment beyond these state-model figures was found. 85% · fire code + amendments
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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 is required per CEC §690.12, cited repeatedly and by name across the county's own PV toolkit documents. Those documents describe the rapid-shutdown initiation device requirement using 2019 CEC (2017 NEC)-era array-boundary language ('within 10 feet of the array and uncontrolled PV system conductors are no greater than 5 feet of length within the building'). The county's currently codified electrical code, however, is the 2022 CEC (2020 NEC) — one cycle newer than the toolkit documents cite; this lag is reported as written, not resolved. 82% · NEC edition in force
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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? Yes. A 'WARNING: PHOTOVOLTAIC POWER SOURCE' placard is required at the main service disconnect, plus a full set of additional required labels at specific equipment/locations: a shock-hazard warning at the utility-interactive inverter/battery enclosure; an ungrounded-DC-circuit shock-hazard warning at each junction/combiner box and disconnect; 'PHOTOVOLTAIC SYSTEM DISCONNECT' labels on the AC and DC disconnects; operating-current/voltage markings on the DC disconnect; rated-AC-output markings at the interconnection point; a 'PHOTOVOLTAIC SYSTEM EQUIPPED WITH RAPID SHUTDOWN' label at the rapid-shutdown device; a service/inverter/rapid-shutdown-device location directory; a terminal shock-hazard warning on de-energized-in-open-position equipment; and a 'do not relocate' warning on the inverter-output overcurrent device. 90% · ordinance / utility spec
- Does the authority specify placard wording of its own? The county's own documents restate exact, verbatim required label wording for every required placard (see Q38) — but this is the state model-code (CEC §690/§705, CFC §605.11.1, CRC R331.2) wording, republished by the county, not wording the county itself originated. 80% · ordinance
- Does it specify letter height, colour or material? Yes for the main placard: minimum 3/8-inch (9.5 mm) white lettering on a red background, made of reflective, weather-resistant material, for the 'WARNING: PHOTOVOLTAIC POWER SOURCE' sign (restating CFC 605.11.1.1/.2 & CRC R331.2.1-2). Separately, for general equipment nameplates/markings under the Solar PV Standard Plan toolkit, the county gives an informational note (citing ANSI Z535.4) that 'no type size is specified, but 20 point (3/8") should be considered the minimum,' suggesting a phenolic plaque with contrasting text/background colors. 85% · ordinance
- Is a site plan / facility map placard required, and what must it show? Yes — a site/roof-layout diagram is required showing the layout of all panels/modules, clear access pathways, and the approximate locations of electrical disconnecting means and roof access points. No separate freestanding 'facility map' placard (a physical sign posted at the meter showing system layout) beyond this drawn plan-set diagram was found. 78% · 705.10 + local
- Where must the labels be placed? Labels/markings must be placed: immediately adjacent to the main service disconnect, clearly visible from where the disconnect is operated; on all interior and exterior DC conduit, enclosures, raceways, cable assemblies, junction boxes, combiner boxes and disconnects, repeated at least every 10 feet and within 1 foot of all turns/bends and roof/wall/ceiling penetrations; at each junction box, combiner box, disconnect and device with exposed ungrounded or energized parts; at the rapid-shutdown initiation device or an AHJ-approved location; and as a directory at the electrical service, inverter, and rapid-shutdown device if they are not co-located. 88% · ordinance / utility spec
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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.
- Are batteries permitted, and under what conditions? Batteries are not addressed by any dedicated county ordinance — Titles 15, 19 and 20 all return zero hits for 'battery', 'energy storage', or 'ESS' (controlled: positive control 'electrical' = 16 hits in Title 15 alone; fabricated control 'zzqqx' = 0). The county's OWN expedited/prescriptive PV path explicitly EXCLUDES systems with battery storage from the standardized plan set: the Expedited Permit Process eligibility checklist requires the system be 'utility interactive and without battery storage' (General Requirements, item D) to use the pre-approved simplified toolkit — a system with a battery isn't barred, but it must be reviewed as a full engineered submittal rather than the standardized path. 75% · fire code + amendments
- Is there a separate ESS permit or inspection? No separate ESS-specific permit or inspection type was found; a battery/ESS installation appears to fall to the standard (non-expedited, engineered-design) building-permit process rather than a distinct permit category, and the Consolidated Fee Schedule carries no distinct residential battery/ESS fee line. 65% · ordinance
- Is a ground mount treated as a structure? Effectively yes — ground/pole-mounted PV is excluded from the county's Prescriptive (pre-approved) Installation path and, per that same document, 'require[s] an engineered design,' i.e. full structural review as its own structure. The county separately still publishes a distinct 'Pole (Ground Mount) Prescriptive Requirements' document (generic 2013 boilerplate, 2010 CBC/CRC) suggesting a standardized structural treatment for pole footings does exist in practice despite the stated blanket exclusion. No dedicated zoning-code setback/height rule specific to ground-mounted SOLAR was located — Mono's actual Zoning Code is not codified on Municode (see Q25) and could not be searched directly; the only comparable zoning-level structure found is the Small Wind Energy Systems chapter (MCC Ch. 20.05), which is wind-specific, not solar. 65% · ordinance
- Is there a local rule on service upgrades or busbar sizing? No local busbar-sizing or service-upgrade amendment was found anywhere in Chapter 15.04 (controlled full-text search: 'busbar'/'bus bar'/'225 A' = 0 hits; positive control 'electrical' = 16 hits; fabricated control 'zzqqx' = 0 hits). The county's own Solar PV Standard Plan toolkits DO reference the standard nationwide 225A busbar ceiling used for the AB 2188-model simplified/expedited PV eligibility path ('PV system is interconnected to a single-phase AC service panel...with a bus bar rating of 225 A or less') — but that is the state-model eligibility gate for the standardized plan, not a Mono-specific local amendment. 78% · amendments
- Is a specific mounting system or attachment spacing required? No universal codified mounting-spacing table exists, but the county's own 2014 'Prescriptive Installation Requirements and Restrictions' document sets a prescriptive standard for the roof-mount-only path: a rack leg or stand-off bracket fastened directly to every roof rafter/truss covered by the panels, maximum allowable panel area per fastener per referenced Tables RS-1 through RS-4, panels no more than 12 inches above the roof surface, and fixed (non-adjustable, non-tracking) mounting only. NOTE A CONFLICT: that same document states 'pole or ground-mounted systems are not eligible for Prescriptive Installation and require an engineered design' — yet the county separately publishes a distinct 'Pole (Ground Mount) Prescriptive Requirements' document (a generic, badly dated 2013 structural boilerplate citing the 2010 CBC/CRC). Both documents are currently linked from the county's own solar toolkit table of contents; reported as written, not resolved. 75% · amendments
20 questions answered against Mono County’s own published documents
Q29 Which NEC edition is in force? Core Code editions in force
2020 NEC, adopted as the 2022 California Electrical Code (Title 24, Part 3), codified at MCC §15.04.030(C) via Ord. 22-18 (12-20-2022). This is the currently codified/operative edition, and is one full code cycle behind the 2023 NEC-based 2025 CEC that took effect statewide 1 Jan 2026 — the codification (through Ord. 25-006, Dec 2025 supplement) shows no amending ordinance to §15.04.030 since Dec 2022.
Why the confidence is not higherMCC §15.04.030(C), read directly; cross-checked against the code's own supplement history (Job metadata: codified through Ord. No. 25-006, 26 Dec 2025, with an empty 'NewOrds' list for Chapter 15.04, confirming no pending amendment to the code-adoption section).
adopting ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.030CABUSTCOTI24UNINCOAD
Q30 Which building code edition is in force? Core Code editions in force
2022 California Building Code and 2022 California Residential Code (Title 24 Parts 2 and 2.5), codified at MCC §15.04.030(B)/(K) via Ord. 22-18 (12-20-2022) — the currently operative edition, one cycle behind the 2025 CBC/CRC cycle that took effect statewide 1 Jan 2026 (same lag as Q29).
Why the confidence is not higherMCC §15.04.030(B) and (K), read directly.
adopting ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.030CABUSTCOTI24UNINCOAD
Q31 Which fire code edition is in force? Code editions in force
2022 California Fire Code (Title 24, Part 9), codified at MCC §15.04.030(H) via the same Ord. 22-18 — Mono County has no separate fire-code chapter or county fire department of its own; this Title 24 blanket adoption is the only county-level fire-code citation found. (The Town of Mammoth Lakes' own Fire Protection District separately adopted the 2022 California Fire Code by its own ordinance, consistent with the same cycle.)
Why the confidence is not higherMCC §15.04.030(H); 2026 Multi-Jurisdictional Local Hazard Mitigation Plan citing 'MLFPD-2022 Ordinance Adopting The 2022 California Fire Code' for the Town.
adopting ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.030CABUSTCOTI24UNINCOAD
Q32 Are there local amendments to any of the above? Core Code editions in force
Yes. MCC §15.04.020 (Express Findings) states local amendments are 'reasonably necessary because of local climatic, geological or topographical conditions, including snow loads, freezing temperatures, high winds, and remote mountain terrain' — codified as the elevation-banded Mono County Snow Load Design Criteria (§15.04.140) and the defensible-space/WUI fire-hazard-reduction requirements (§15.04.150). As of 25 Feb 2026 the Building Official has additionally issued a formal policy authorizing continued use of the county's own snow-load criteria as an ASCE 7-22 'alternative method of construction' in lieu of the state-mandated Hazard Tool.
Why the confidence is not higherMCC §§15.04.020, 15.04.140, 15.04.150, read directly; 'Snow Load Policy and Procedure' memo dated 25 Feb 2026, read directly.
ordinance checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.020EXFI
Q33 What is the installation judged against? Core Electrical
The 2022 Title 24 code suite (CBC/CRC/CEC/CFC — see Q29-31) PLUS Mono County's own local structural amendments: the codified elevation-banded Ground/Roof Snow Load Design Criteria table (MCC §15.04.140 — up to 285 psf ground / 220 psf roof snow load at the county's highest-elevation communities), and, as of 25 Feb 2026, the Building Official's own policy permitting continued use of that county table (rather than the state-mandated ASCE 7-22 Hazard Tool) as an 'alternative method of construction' under CBC §104.2.3, on the documented finding that the Hazard Tool overstates local ground snow loads by up to 135% for this terrain.
Why the confidence is not higherMCC §15.04.140 (Snow loads) and the county's 'Snow Load Policy and Procedure' memo (25 Feb 2026, Building Official Tom Perry), both read directly.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/3356
Q34 Is there a local rule on service upgrades or busbar sizing? Electrical
No local busbar-sizing or service-upgrade amendment was found anywhere in Chapter 15.04 (controlled full-text search: 'busbar'/'bus bar'/'225 A' = 0 hits; positive control 'electrical' = 16 hits; fabricated control 'zzqqx' = 0 hits). The county's own Solar PV Standard Plan toolkits DO reference the standard nationwide 225A busbar ceiling used for the AB 2188-model simplified/expedited PV eligibility path ('PV system is interconnected to a single-phase AC service panel...with a bus bar rating of 225 A or less') — but that is the state-model eligibility gate for the standardized plan, not a Mono-specific local amendment.
Why the confidence is not higherFull-text read of MCC Chapter 15.04; 'Expedited Permit Process for Solar Photovoltaic (PV) Systems' Electrical Requirements item C.
amendments checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1321
Q35 Is a specific mounting system or attachment spacing required? Structural & mounting
No universal codified mounting-spacing table exists, but the county's own 2014 'Prescriptive Installation Requirements and Restrictions' document sets a prescriptive standard for the roof-mount-only path: a rack leg or stand-off bracket fastened directly to every roof rafter/truss covered by the panels, maximum allowable panel area per fastener per referenced Tables RS-1 through RS-4, panels no more than 12 inches above the roof surface, and fixed (non-adjustable, non-tracking) mounting only. NOTE A CONFLICT: that same document states 'pole or ground-mounted systems are not eligible for Prescriptive Installation and require an engineered design' — yet the county separately publishes a distinct 'Pole (Ground Mount) Prescriptive Requirements' document (a generic, badly dated 2013 structural boilerplate citing the 2010 CBC/CRC). Both documents are currently linked from the county's own solar toolkit table of contents; reported as written, not resolved.
Why the confidence is not higher'Mono County Prescriptive Design - Residential Solar Prescriptive Installation' items 8-16 (New 2/2014); 'Pole Ground Mount Prescriptive Requirements' document (pdfinfo CreationDate 17 May 2013, citing 2010 CBC/CRC), both read directly.
amendments checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1454
Q36 What ridge setback and access pathways are required? Core Fire pathways & setbacks
The standard, unamended 2022 CFC §605.11.1.2 / CRC R324.6 model rules apply, restated verbatim in the county's own PV Toolkit Inspection Guide: two minimum 36-inch-wide access pathways from eave to ridge on separate roof planes (at least one on the street/driveway side); a ridge setback of 18 inches where the array covers 33% or less of the roof plan area, or 36 inches where it covers more than 33% (reduced to 18%/66% thresholds where an NFPA 13D sprinkler system is installed). The county's own (2014) Prescriptive Installation document separately allows an alternate 12-inch ridge clearance for tile/metal-shingle roofing, or steep composition-shingle roofs, waivable to less with Fire Official approval where alternative smoke ventilation exists. No local amendment beyond these state-model figures was found.
Why the confidence is not higher'Field Inspection Guide and Comprehensive Reference' (PV Toolkit Document #7), Fire Safety Requirements items 6.A-E, read directly; cross-checked against 'Prescriptive Design - Residential Solar Prescriptive Installation' items 13-14.
fire code + amendments checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q37 Is rapid shutdown required, and to which NEC edition? Core Rapid shutdown
Yes — rapid shutdown is required per CEC §690.12, cited repeatedly and by name across the county's own PV toolkit documents. Those documents describe the rapid-shutdown initiation device requirement using 2019 CEC (2017 NEC)-era array-boundary language ('within 10 feet of the array and uncontrolled PV system conductors are no greater than 5 feet of length within the building'). The county's currently codified electrical code, however, is the 2022 CEC (2020 NEC) — one cycle newer than the toolkit documents cite; this lag is reported as written, not resolved.
Why the confidence is not higher'Expedited Permit Process for Solar Photovoltaic (PV) Systems' Photovoltaic Disconnect & Rapid Shutdown Requirements section, and 'Field Inspection Guide' item 62, both explicitly stating '2019 versions unless otherwise noted'; cross-checked against MCC §15.04.030(C) (2022 CEC).
NEC edition in force checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1321
Q38 Which placards does this authority require at the service equipment? Core Labels Signage & labelling
Yes. A 'WARNING: PHOTOVOLTAIC POWER SOURCE' placard is required at the main service disconnect, plus a full set of additional required labels at specific equipment/locations: a shock-hazard warning at the utility-interactive inverter/battery enclosure; an ungrounded-DC-circuit shock-hazard warning at each junction/combiner box and disconnect; 'PHOTOVOLTAIC SYSTEM DISCONNECT' labels on the AC and DC disconnects; operating-current/voltage markings on the DC disconnect; rated-AC-output markings at the interconnection point; a 'PHOTOVOLTAIC SYSTEM EQUIPPED WITH RAPID SHUTDOWN' label at the rapid-shutdown device; a service/inverter/rapid-shutdown-device location directory; a terminal shock-hazard warning on de-energized-in-open-position equipment; and a 'do not relocate' warning on the inverter-output overcurrent device.
Why the confidence is not higherCounty's own 'Field Inspection Guide and Comprehensive Reference' (PV Toolkit Document #7), Signs and Labels section (items 63-68 and the accompanying label table), read directly. This restates the 2019 CEC/CFC/CRC model labeling text rather than inventing independent county wording.
ordinance / utility spec checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q39 Does the authority specify placard wording of its own? Core Labels Signage & labelling
The county's own documents restate exact, verbatim required label wording for every required placard (see Q38) — but this is the state model-code (CEC §690/§705, CFC §605.11.1, CRC R331.2) wording, republished by the county, not wording the county itself originated.
Why the confidence is not higherSame 'Field Inspection Guide and Comprehensive Reference' label table, read directly.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q40 Does it specify letter height, colour or material? Core Labels Signage & labelling
Yes for the main placard: minimum 3/8-inch (9.5 mm) white lettering on a red background, made of reflective, weather-resistant material, for the 'WARNING: PHOTOVOLTAIC POWER SOURCE' sign (restating CFC 605.11.1.1/.2 & CRC R331.2.1-2). Separately, for general equipment nameplates/markings under the Solar PV Standard Plan toolkit, the county gives an informational note (citing ANSI Z535.4) that 'no type size is specified, but 20 point (3/8") should be considered the minimum,' suggesting a phenolic plaque with contrasting text/background colors.
Why the confidence is not higher'Field Inspection Guide and Comprehensive Reference' item 66; 'Solar Pv Microinverter And Acm Simplified Tool Kit' §8 Markings, both read directly.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q41 Is a site plan / facility map placard required, and what must it show? Core Labels Signage & labelling
Yes — a site/roof-layout diagram is required showing the layout of all panels/modules, clear access pathways, and the approximate locations of electrical disconnecting means and roof access points. No separate freestanding 'facility map' placard (a physical sign posted at the meter showing system layout) beyond this drawn plan-set diagram was found.
Why the confidence is not higher'Expedited Permit Process for Solar Photovoltaic (PV) Systems', Fire Safety Requirements item D, read directly.
705.10 + local checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1321
Q42 Does the UTILITY specify placards beyond the AHJ's? Core Labels Signage & labelling
Nothing published by this authority.
Where we lookedSCE's own DG-interconnection/placard-specification pages are known from prior runs to soft-404 unpredictably; the one SCE document the county itself hosts and links ('Sce Service Request Process And Meter Release Requirements') was downloaded and read in full and covers only SCE's general new-service/meter-set 'Local Planning' process — it contains zero mentions of 'solar', 'photovoltaic', 'disconnect', 'interconnect', or 'PTO'. Per standing guidance, another utility's DG manual was not substituted.
Q43 Where must the labels be placed? Core Labels Signage & labelling
Labels/markings must be placed: immediately adjacent to the main service disconnect, clearly visible from where the disconnect is operated; on all interior and exterior DC conduit, enclosures, raceways, cable assemblies, junction boxes, combiner boxes and disconnects, repeated at least every 10 feet and within 1 foot of all turns/bends and roof/wall/ceiling penetrations; at each junction box, combiner box, disconnect and device with exposed ungrounded or energized parts; at the rapid-shutdown initiation device or an AHJ-approved location; and as a directory at the electrical service, inverter, and rapid-shutdown device if they are not co-located.
Why the confidence is not higher'Field Inspection Guide and Comprehensive Reference' items 63-65 and the label-location table, read directly.
ordinance / utility spec checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q44 Must equipment be on a specific approved list? Equipment listing
Nothing published by this authority.
Where we lookedchecked the Prescriptive Installation document, the Expedited Permit Process document, and the PV toolkit standard plans for a county-specific 'approved equipment list' requirement beyond generic UL-listing/labeling references (UL 1703, UL 1741) already implicit in the CEC; none found
Q45 Are batteries permitted, and under what conditions? Core Battery / ESS
Batteries are not addressed by any dedicated county ordinance — Titles 15, 19 and 20 all return zero hits for 'battery', 'energy storage', or 'ESS' (controlled: positive control 'electrical' = 16 hits in Title 15 alone; fabricated control 'zzqqx' = 0). The county's OWN expedited/prescriptive PV path explicitly EXCLUDES systems with battery storage from the standardized plan set: the Expedited Permit Process eligibility checklist requires the system be 'utility interactive and without battery storage' (General Requirements, item D) to use the pre-approved simplified toolkit — a system with a battery isn't barred, but it must be reviewed as a full engineered submittal rather than the standardized path.
Why the confidence is not higherFull-text search of MCC Titles 15/19/20; 'Expedited Permit Process for Solar Photovoltaic (PV) Systems' General Requirements item D, both read/searched directly.
fire code + amendments checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1321
Q46 Is there a separate ESS permit or inspection? Battery / ESS
No separate ESS-specific permit or inspection type was found; a battery/ESS installation appears to fall to the standard (non-expedited, engineered-design) building-permit process rather than a distinct permit category, and the Consolidated Fee Schedule carries no distinct residential battery/ESS fee line.
Why the confidence is not higherSame searches as Q45; Consolidated Fee Schedule reviewed in full for a battery/ESS line, none found.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/651
Q47 Is a ground mount treated as a structure? Core Ground mount
Effectively yes — ground/pole-mounted PV is excluded from the county's Prescriptive (pre-approved) Installation path and, per that same document, 'require[s] an engineered design,' i.e. full structural review as its own structure. The county separately still publishes a distinct 'Pole (Ground Mount) Prescriptive Requirements' document (generic 2013 boilerplate, 2010 CBC/CRC) suggesting a standardized structural treatment for pole footings does exist in practice despite the stated blanket exclusion. No dedicated zoning-code setback/height rule specific to ground-mounted SOLAR was located — Mono's actual Zoning Code is not codified on Municode (see Q25) and could not be searched directly; the only comparable zoning-level structure found is the Small Wind Energy Systems chapter (MCC Ch. 20.05), which is wind-specific, not solar.
Why the confidence is not higher'Prescriptive Design - Residential Solar Prescriptive Installation' item 1; 'Pole Ground Mount Prescriptive Requirements' document; MCC Title 20 chapter list, all read/reviewed directly.
ordinance checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1454
Q48 Where must the AC disconnect be, relative to the meter? Core Utility equipment
Nothing published by this authority.
Where we lookedSCE's own DG manual for AC-disconnect-to-meter placement was not independently retrievable from this network; the one SCE document the county itself hosts and links covers only general new-service/meter-set planning and does not address disconnect placement (see Q42). Per standing guidance another utility's spec was not substituted.
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? By phone, via the county's published Inspection Hotline: 760-924-1827 — printed on every Building Division page, form, and toolkit document reviewed. No online inspection-scheduling portal was found. 85% · 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 — self-performed in-house. No delegation evidence was found across the tells checked (staff directory/email domains all @mono.ca.gov, no staffing-firm name in the fee schedule, no contractor-branded permit portal, no warrant-register or budget line reviewed showing contracted plan-check/inspection). 75% · department page
- If delegated, to whom? N/A — not delegated (see Q52). 75% · department page
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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? The county's own PV Toolkit 'Field Inspection Guide' (Document #7) is framed as a single consolidated final-inspection checklist for rooftop PV meeting the Standard Plan — covering mounting, electrical, grounding, disconnects, rapid shutdown, and labeling together — implying one field inspection rather than separate rough-in and final stages for a standard-plan PV system. The county's separate (2014) Prescriptive Installation document additionally requires an UNUSUAL extra step specific to Mono: a structural certification inspection of the roof BOTH at completion of installation AND again one year later, performed by the owner, a licensed contractor, or a PE, certifying no adverse roof/structural condition has developed. 70% · 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? Yes — the county's own 'PV Toolkit Document #7: Inspection Guide for PV Systems in One- and Two-Family Dwellings' (Field Inspection Guide + Comprehensive Reference), published and linked from the Building Division's solar toolkit. 92% · department page
- What must be on site at inspection? Not stated as a distinct itemized list, but implied throughout: nearly every Field Inspection Guide checklist item is phrased '...according to the approved plan', indicating the approved plan set (and, per the 2014 Prescriptive doc, the signed Owner's Certification) must be available on site for the inspector to check work against. No explicit 'bring these documents to inspection' list was found. 58% · department page
- Does the inspector verify labels and listings? Yes, explicitly. The Field Inspection Guide requires the inspector to verify 'Equipment installed, listed and labeled according to the approved plan (e.g., PV modules, DC/DC converters, combiners, inverters, disconnects, load centers and electrical service equipment)' and 'PV system markings, labels and signs according to the approved plan.' 92% · department page
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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.
- How are corrections issued and cleared? For PLAN-REVIEW (not post-field-inspection) corrections: MCC §15.04.220(G)(3) states that if the Building Official determines a solar permit application is incomplete, 'they shall issue a written correction notice to the applicant, detailing all deficiencies in the application and any additional information required.' No document was found describing how FIELD-inspection corrections specifically (as opposed to plan-review deficiencies) are issued or cleared. 68% · department page
14 questions answered against Mono County’s own published documents
Q49 How is an inspection booked? Core Booking & scheduling
By phone, via the county's published Inspection Hotline: 760-924-1827 — printed on every Building Division page, form, and toolkit document reviewed. No online inspection-scheduling portal was found.
Why the confidence is not higherBuilding Division page and every Building Permit Application/toolkit document footer, read directly.
department page checked 2026-08-31 https://www.monocounty.ca.gov/1779/Building
Q50 How much notice is required? Core Booking & scheduling
Nothing published by this authority.
Where we lookedchecked the Building Division page and every solar toolkit document for a stated minimum notice period (e.g. '24 hours', '2 business days') before an inspection can be booked; none found
Q51 Are same-day or AM/PM windows offered? Booking & scheduling
Nothing published by this authority.
Where we lookedchecked the Building Division page and the Field Inspection Guide for stated same-day or AM/PM inspection windows; none found
Q52 Does this AHJ perform its own final solar inspection? Core Who inspects
Yes — self-performed in-house. No delegation evidence was found across the tells checked (staff directory/email domains all @mono.ca.gov, no staffing-firm name in the fee schedule, no contractor-branded permit portal, no warrant-register or budget line reviewed showing contracted plan-check/inspection).
Why the confidence is not higherBuilding Division page (named Building Official Tom Perry, tperry@mono.ca.gov) and every reviewed document's contact block.
department page checked 2026-08-31 https://www.monocounty.ca.gov/1779/Building
Q53 If delegated, to whom? Core Who inspects
N/A — not delegated (see Q52).
Why the confidence is not higherSame evidence as Q52.
department page checked 2026-08-31 https://www.monocounty.ca.gov/1779/Building
Q54 Which inspections are required, and in what order? Core Stages & sequence
The county's own PV Toolkit 'Field Inspection Guide' (Document #7) is framed as a single consolidated final-inspection checklist for rooftop PV meeting the Standard Plan — covering mounting, electrical, grounding, disconnects, rapid shutdown, and labeling together — implying one field inspection rather than separate rough-in and final stages for a standard-plan PV system. The county's separate (2014) Prescriptive Installation document additionally requires an UNUSUAL extra step specific to Mono: a structural certification inspection of the roof BOTH at completion of installation AND again one year later, performed by the owner, a licensed contractor, or a PE, certifying no adverse roof/structural condition has developed.
Why the confidence is not higher'Field Inspection Guide and Comprehensive Reference' (single-document framing); 'Prescriptive Design - Residential Solar Prescriptive Installation' item 21, both read directly.
department page checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q55 Is a rough-in or mid-roof inspection required? Stages & sequence
Nothing published by this authority.
Where we lookedchecked the Field Inspection Guide and the Expedited Permit Process document for an explicit separate rough-in/mid-roof inspection stage distinct from the single consolidated final inspection described for standard-plan PV; none named, though the framing (see Q54) is suggestive rather than a stated 'no rough-in required' rule
Q56 Does the inspector verify labels and listings? Core What is checked
Yes, explicitly. The Field Inspection Guide requires the inspector to verify 'Equipment installed, listed and labeled according to the approved plan (e.g., PV modules, DC/DC converters, combiners, inverters, disconnects, load centers and electrical service equipment)' and 'PV system markings, labels and signs according to the approved plan.'
Why the confidence is not higher'Field Inspection Guide' Section 6.1, items 10 and 17, read directly.
department page checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q57 Is there a published inspection checklist? Core What is checked
Yes — the county's own 'PV Toolkit Document #7: Inspection Guide for PV Systems in One- and Two-Family Dwellings' (Field Inspection Guide + Comprehensive Reference), published and linked from the Building Division's solar toolkit.
Why the confidence is not higherDocument itself, read directly.
department page checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q58 What must be on site at inspection? Core Documents on site
Not stated as a distinct itemized list, but implied throughout: nearly every Field Inspection Guide checklist item is phrased '...according to the approved plan', indicating the approved plan set (and, per the 2014 Prescriptive doc, the signed Owner's Certification) must be available on site for the inspector to check work against. No explicit 'bring these documents to inspection' list was found.
Why the confidence is not higherInference from the repeated phrasing throughout the Field Inspection Guide and Comprehensive Reference.
department page checked 2026-08-31 https://www.monocounty.ca.gov/DocumentCenter/View/1323
Q59 Is there a re-inspection fee? Corrections & re-inspection
Nothing published by this authority.
Where we lookedchecked the Consolidated Fee Schedule in full for a building/solar re-inspection fee line; only unrelated Environmental Health 'Second or Subsequent Reinspection' hourly lines ($141/hr, for food/hazmat/pool/water/etc. programs) were found, none tied to Building/solar
Q60 How are corrections issued and cleared? Corrections & re-inspection
For PLAN-REVIEW (not post-field-inspection) corrections: MCC §15.04.220(G)(3) states that if the Building Official determines a solar permit application is incomplete, 'they shall issue a written correction notice to the applicant, detailing all deficiencies in the application and any additional information required.' No document was found describing how FIELD-inspection corrections specifically (as opposed to plan-review deficiencies) are issued or cleared.
Why the confidence is not higherMCC §15.04.220(G)(3), read directly.
department page checked 2026-08-31 https://library.municode.com/ca/mono_county/codes/code_of_ordinances?nodeId=TIT15BUCO_CH15.04BURE_15.04.220SMREROSOENPEEXOR
Q61 What is issued on pass? Core Final sign-off & PTO
Nothing published by this authority.
Where we lookedchecked MCC §§15.04.060, 15.04.120 and 15.04.220, plus the Field Inspection Guide, for a specifically named document/card issued on a passed solar inspection (CO / Final / Green tag / Letter); all three consistently describe the outcome only as 'approval...following a final inspection' without naming a specific issued instrument
Q62 Who notifies the utility for PTO? Core Final sign-off & PTO
Nothing published by this authority.
Where we lookedno Mono County document addresses who notifies SCE (or Liberty Utilities, for the Walker/Coleville/Topaz area) for Permission to Operate; this is a utility-level process question not addressed by the county's own materials, and SCE's/Liberty's own interconnection process pages were not substituted per standing guidance
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 Mono 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.
Mono County is the authority having jurisdiction 90% confidence
- Holds
- Building AND Electrical for UNINCORPORATED Mono County only, self-performed in-house by the Community Development Department's Building Division (offices in Mammoth Lakes and Bridgeport; Building Official Tom Perry). The Town of Mammoth Lakes -- Mono County's only incorporated town -- is a SEPARATE AHJ: it has its own Municode-codified Title 15 (Buildings and Construction), and the Mammoth Lakes Fire Protection District independently adopted its own 2022 California Fire Code by MLFPD ordinance. No county fire department exists; the county's own Building Official (not a fire marshal) is the codified enforcer of WUI/defensible-space compliance prior to occupancy (MCC 15.04.150), while fire suppression itself across unincorporated Mono is fragmented among roughly six separate community fire protection districts/departments named in the county's own 2026 Multi-Jurisdictional Hazard Mitigation Plan: Antelope Valley FPD (Walker/Coleville/Topaz), Bridgeport FD, Lee Vining FPD, June Lake FPD, Mono City FPD, and Long Valley FD (Crowley Lake/Swall Meadows), plus CAL FIRE and USFS on the county's large federal-land majority.
- Overridden by
- State law overlays apply as everywhere in CA (Civil Code Section 714 Solar Rights Act preempting HOA/architectural restrictions -- in direct, unreconciled tension with the county's own 2014 Prescriptive Installation document's written HOA-approval requirement; Gov. Code Sections 65850.5/.52/.55 ministerial-permitting and fee-cap framework, cited in MCC 15.04.220 and the fee schedule). No zoning-level solar-specific override was found because Mono County's actual Zoning Code is not codified on Municode at all -- MCC Title 19 Section 19.00.010 states that 'all use and development of private land... shall fully comply with... the Mono County general plan... and any applicable area or specific plans,' which are incorporated by reference rather than codified as a conventional zoning ordinance; this could not be retrieved and searched directly.
- Why not higher
- County's own Building Division page states the unincorporated-only scope in plain language ('We do not oversee or permit work within the Town of Mammoth Lakes'). Mammoth Lakes' independent Municode client (own Title 15, current through June 2026 -- ahead of the county's own Dec 2025 codification) and its own MLFPD fire-code ordinance (cited in the joint Hazard Mitigation Plan) corroborate it as a genuinely separate, self-performing AHJ. The fragmented-fire-district picture is corroborated from the county's own 2026 HMP's special-district annexes (Mammoth Lakes FPD Annex, Mono City FPD Annex, and named district staff in the planning-team roster). Confidence is not higher because Mono's operative Zoning Code text itself (as opposed to the General Plan's incorporation-by-reference clause) could not be directly retrieved and read from this network, so any zoning-level ground-mount/setback/historic override remains unconfirmed either way.
Check the code edition before you build
This authority's published code edition does not match what the state has adopted. That usually means the authority's ordinance has not been updated for the current cycle — but a local amendment can also be lawful. Confirm with the building department before you submit.
- Permit required
- Yes. MCC §15.04.220 (Small Residential Rooftop Solar Energy Permit Expediting Ordinance) governs permitting of small residential rooftop solar systems,95%
- Permit cost
- $450 flat for a residential PV system up to 15 kW AC (or $450 flat for a residential thermal system up to 10 kWth),78%
- Portal
- No online/electronic permitting portal was identified. Residential PV is submitted on the county's 'Minor Building Permit Application' fillable PDF,68%
- Electrical code
- 2020 NEC, adopted as the 2022 California Electrical Code (Title 24, Part 3), codified at MCC §15.04.030(C) via Ord. 22-18 (12-20-2022).88%
- Own placard wording
- The county's own documents restate exact, verbatim required label wording for every required placard (see Q38) — but this is the state model-code (CEC §690/§705, CFC §605.11.1,80%
- Booking an inspection
- By phone, via the county's published Inspection Hotline: 760-924-1827 — printed on every Building Division page, form, and toolkit document reviewed.85%
Labels & placards for this authority
Wording 80%
The county's own documents restate exact, verbatim required label wording for every required placard (see Q38) — but this is the state model-code (CEC §690/§705, CFC §605.11.1, CRC R331.2) wording, republished by the county, not wording the county itself originated.
Size, colour & material 85%
Yes for the main placard: minimum 3/8-inch (9.5 mm) white lettering on a red background, made of reflective, weather-resistant material, for the 'WARNING: PHOTOVOLTAIC POWER SOURCE' sign (restating CFC 605.11.1.1/.2 & CRC R331.2.1-2). Separately, for general equipment nameplates/markings under the Solar PV Standard Plan toolkit, the county gives an informational note (citing ANSI Z535.4) that 'no type size is specified, but 20 point (3/8") should be considered the minimum,' suggesting a phenolic plaque with contrasting text/background colors.
Where they go 88%
Labels/markings must be placed: immediately adjacent to the main service disconnect, clearly visible from where the disconnect is operated; on all interior and exterior DC conduit, enclosures, raceways, cable assemblies, junction boxes, combiner boxes and disconnects, repeated at least every 10 feet and within 1 foot of all turns/bends and roof/wall/ceiling penetrations; at each junction box, combiner box, disconnect and device with exposed ungrounded or energized parts; at the rapid-shutdown initiation device or an AHJ-approved location; and as a directory at the electrical service, inverter, and rapid-shutdown device if they are not co-located.
What the utility wants on top None%
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.