Humboldt County

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, for the unincorporated area of Humboldt County only 95% · authority's own page
• What does this authority permit itself, and what does it delegate? Both — the county's Building Inspection Division (within the Planning and Building Department) issues and inspects both the building permit and the electrical permit for residential PV; not delegated. 90% · fee schedule
• Is a permit required for a residential rooftop PV system? Yes 95% · ordinance
• Is there a separate electrical permit, or is it combined? Combined — a single Accela building-permit record covers a residential PV installation; the electrical-work fee is drawn from a distinct 'Electrical Permit Fees' section of the same fee schedule but is not a separate permit filing. 75% · fee schedule
• Is a HOA or architectural approval required first? No — the county code expressly bars conditioning a solar permit on association approval. 80% · ordinance
• Is there a historic-district review? Only if the specific structure has been designated a 'County Historic Structure' by the Board of Supervisors — in that narrow case, exterior alterations require Design Review. There is no county-wide historic-district review that would apply to an ordinary residential rooftop PV installation. 70% · ordinance
• Is a Specific Use Permit or Council approval ever required? A Coastal Development Permit (CDP) is required for development within the Coastal Zone unless the project is exempt under Public Resources Code §30000 et seq. (e.g., as an improvement to an existing single-family residence); outside the Coastal Zone, no Special/Use Permit is triggered by residential rooftop PV alone under the standard permitted-use provisions. 65% · ordinance
• Is there a system-size cap on residential generation? No general cap on residential system size, but the county's streamlined/expedited permit pathway (County Code §842) is limited to systems no larger than 10 kW AC or 30 kW thermal on a single/duplex dwelling; larger systems must use the standard, non-expedited building-permit process. 80% · ordinance

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 — a licensed contractor (CSLB General B, C-10, or C-46) may pull it via Fast Track or SolarAPP+, or the property owner may self-permit through the Regular Building Permit process. 80% · department page
• Must the contractor be registered with this authority before applying? No separate county contractor registration found — applicants create an Accela Citizen Access (ACA) account and provide their CSLB license number at time of application; no distinct pre-registration step with the county is described. 55% · department page
• Is a homeowner permitted to self-install and self-permit? Yes 85% · department page

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? For SolarAPP+: SolarAPP+ approval document, SolarAPP+ ID, SolarAPP+ spec sheet, and a PG&E-signed interconnection agreement. For a regular/Fast-Track PV permit: a completed building application plus the items on the Roof-Mount or Ground-Mount PV Plan Checklist (roof/site plan, one-line diagram, equipment data sheets, sticker/placard layout). 85% · department page
• How many copies, and in what format? Electronic only — submittal is by upload (PDF) to the applicant's Accela Citizen Access record; no paper-copy count is specified. 65% · ordinance
• Is a site plan required, and what must it show? Yes. The county's general Site Plan Checklist requires: APN/owner/applicant info, full parcel with dimensions, north arrow/scale, access roadways, easements, slope/gradient, streamside management area (SMA) buffers (100 ft perennial / 50 ft intermittent streams), all existing/proposed structures with setbacks and dimensions, SRA 30-ft defensible-space and 100-ft reduced-fuel zones (if applicable), water sources, driveway/parking, trees to be removed, grading, and four site photos (N/S/E/W). 90% · published checklist
• Is a one-line / three-line diagram required? Yes 95% · published checklist
• Are string and conductor calculations required? Yes 90% · published checklist
• Is a structural PE stamp required, and at what threshold? Not a blanket PE-stamp requirement for typical roof-mount PV; the county's own checklist calls out structural engineering only for 'ag-exempt structures supporting PV modules and over-spanned rafters,' per the CALSEIA Solar Toolkit 5 span tables referenced on the checklist. 70% · published checklist

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? Accela Citizen Access (ACA) — aca-prod.accela.com/humboldt 95% · portal landing page
• Can the whole application be completed online? Largely yes — application, document upload, fee payment, and (for SolarAPP+ projects) the code-compliance review itself are all completed online through SolarAPP+ + Accela; in-person counter service exists but is not required. 80% · portal / department page
• What does a residential solar permit cost? $357 flat electrical-permit fee for a residential roof-mount PV system that complies with AB 2188 and does not require an electric service upgrade; $104 flat (per system) for a ground-mount PV system or one that does not comply with AB 2188. A separate valuation-based building-permit fee schedule also applies to the structural/building portion of the work. 85% · fee schedule
• How is the fee calculated? Flat — a fixed dollar amount from the electrical-permit fee table ($357 AB-2188-compliant roof-mount; $104 ground-mount/non-compliant), not tied to system valuation or per-kW/per-panel count. The separate building-permit component (if triggered) uses the county's standard total-valuation table. 80% · fee schedule
• Is there a separate plan-check fee? Not billed as a separate line item for PV — the $357 flat AB-2188 fee is listed once, with no distinct plan-check add-on shown for photovoltaic systems (unlike the general valuation-based building permit, where 'Plan review fee shall be 65% of the building permit fee'). 60% · fee schedule

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.

• What is the stated plan-review turnaround? For SolarAPP+: instant/same-day (code-compliance check is automated). For a regular or Fast-Track permit application: first staff response on completeness within 2–3 business days. 75% · department page
• Which utility handles interconnection here? Pacific Gas & Electric (PG&E) — not the local CCA (Redwood Coast Energy Authority, which is a power procurement entity, not the interconnecting distribution utility). 90% · department page
• Where does the utility sit in the sequence? Before permit — for SolarAPP+, PG&E interconnection-agreement approval is Step II, completed before the Step IV permit application; for a regular building permit, PG&E is listed as one of the referral agencies that 'may be required to sign-off on your project before it begins.' 80% · department page

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 NEC, as amended into the 2025 California Electrical Code (Title 24, Part 3), effective 1 Jan 2026. 75% · 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 Jan 2026; the 2022 editions still govern applications submitted through 31 Dec 2025. 90% · adopting ordinance
• Are there local amendments to any of the above? Not clearly documented beyond straight adoption — the Building Codes page lists Title 24 Parts 1–8, 10, 11 plus older national model codes (2021 IPMC, 1997 UHC, 1997 USC) as adopted 'and their respective successor provisions' under County Code §331-11, without describing specific local amendments to the solar-relevant chapters (CRC/CEC/CFC). 60% · ordinance
• What is the installation judged against? The currently adopted California codes (2025 CBC/CRC/CEC as of 1 Jan 2026, 2022 editions for earlier-filed applications) plus manufacturer listings/specifications called out on the PV Plan Checklists (UL 1703, UL 61730-1/2, UL 2703, UL 1741, UL 9540). 85% · ordinance / published checklist

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? Pathways and ridge setback are governed by the adopted California Residential Code §R324.6 and California Fire Code §1204.3, as cited directly on the county's own PV checklist; the county does not publish different numeric values of its own. 70% · published checklist

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 devices are required and shown on the required one-line diagram, cited to CEC §690.12 (module-level/array rapid shutdown, consistent with the NEC edition correlated to the currently adopted 2025 CEC). 80% · published checklist

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? At minimum: PV disconnect/marking stickers per CEC 690 Part VI Marking, plus (if the disconnecting means are not all at one location) an engraved placard per CEC 705.10; the interconnecting utility (PG&E) separately requires its own permanent 'UTILITY AC DISCONNECT SWITCH' label at the point of interconnection. 85% · published checklist / utility spec
• Does the authority specify placard wording of its own? The AHJ itself does not specify custom placard wording (it references NEC/CEC marking sections); the interconnecting utility PG&E does specify exact wording for its own disconnect label: 'UTILITY AC DISCONNECT SWITCH.' 80% · utility spec
• Does it specify letter height, colour or material? The county does not specify letter height/color/material itself. The utility (PG&E) does: labels must be 'permanent and suitable for the environment,' either engraved phenolic or compliant with ANSI Z535.4, with lettering a minimum of 3/8 inch high, in all capitals. 85% · utility spec
• Is a site plan / facility map placard required, and what must it show? A facility/site-plan-style placard is effectively required through the 'Sticker Layout' plan-set requirement and PG&E's requirement for a location map whenever the AC disconnect is not grouped with the meter panel; the county does not separately mandate a distinct facility map placard beyond NEC §705.10 marking. 65% · utility spec / 705.10
• Does the UTILITY specify placards beyond the AHJ's? Yes. PG&E's Distributed Generation disconnect-switch document (Greenbook doc. 060559) specifies its own labeling beyond the AHJ's: permanent engraved-phenolic or ANSI Z535.4 labels reading e.g. 'UTILITY AC DISCONNECT SWITCH,' minimum 3/8-inch capital lettering, plus a device label with ratings/UL certification, and (if the NGOM or disconnect is not co-located with the meter) a location map and, if inside a locked premises, contact-information signage and an approved locking device. 90% · utility spec
• Where must the labels be placed? Labels/placards go on the front of the AC disconnect switch enclosure itself; the disconnect must be within 10 feet, in line of sight, of PG&E's meter, at a mounted height between 48 and 75 inches from grade if wall- or pad-mounted; if not adjacent to the meter, a separate location map/sign is required at the meter. 90% · utility spec

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? Within 10 feet of, and in line of sight with, PG&E's electric meter at the point of interconnection; if wall- or pad-mounted, between 48 inches (min) and 75 inches (max) above grade; must be at the same grade level as the meter if outdoors, and is never allowed on a floor/level above grade, on a roof, or in a non-approved meter room. Small (≤240V, ≤320A CL, self-contained socket-based meter) inverter-connected systems may be exempt from installing a separate disconnect switch altogether. 90% · utility spec
• Are batteries permitted, and under what conditions? Yes — batteries/energy storage systems are permitted and are processed the same way as PV (as a residential accessory use), subject to the adopted CFC/CRC energy-storage provisions and UL 9540 listing; standalone (non-PV-paired) or ground-mounted ESS are not eligible for the streamlined SolarAPP+ pathway and must go through the Regular Building Permit process instead. 75% · department page
• Is there a separate ESS permit or inspection? No separate ESS-specific permit — batteries are inspected together with the PV system under the same 'PV (Solar) & Energy Storage' Fast-Track permit and its combined Setbacks/Site Conditions/Electrical Final/Building Final inspections. 75% · department page
• Is a ground mount treated as a structure? Yes — a ground-mounted PV/generator installation is treated as a structure subject to the county's setback requirements and receives a structural 'Building Final' inspection, distinct from roof-mount systems (which skip the ground-mount setback inspection). 80% · department page
• Is there a local rule on service upgrades or busbar sizing? No general county amendment found; the only documented local numeric threshold is a SolarAPP+ eligibility limit (not a blanket rule): 400A or less electric service, containing a 225A service disconnect switch and 225A busbars, to qualify for the SolarAPP+ instant-permit pathway. 65% · department page
• Is a specific mounting system or attachment spacing required? No county-specified spacing value; the checklist requires the applicant to show the manufacturer's racking system, anchor locations, and anchor spacing on the plans, engineered per manufacturer span tables (referencing the CALSEIA Solar Toolkit 5 for over-spanned rafters). 70% · published checklist

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? Portal (Accela — schedule and view results online), Phone (707-445-7245 to be routed, or 707-445-7244 to leave a message), or the county's own webform on the Inspections page. 90% · department page
• How much notice is required? By 3:00 p.m. the business day before the requested inspection date (i.e., roughly one business day's notice) for phone-scheduled inspections. 85% · department page
• Are same-day or AM/PM windows offered? AM/PM preference can be requested (not guaranteed) when leaving a phone message; specific inspection times are not promised because each inspector covers 5–15 stops a day on a fixed area route. 85% · department page

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

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? For the Fast-Track 'PV (Solar) & Energy Storage' permit: Setbacks (ground-mount systems only) → Site Conditions → Electrical Final → Building Final. These can be scheduled together as a single site visit. 90% · department page
• Is a rough-in or mid-roof inspection required? No — fast-track PV/ESS permits are described as requiring only 'one inspection' (a single combined site visit covering the four checks above); no separate rough-in or mid-roof inspection stage is listed for solar. 80% · ordinance / department page

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 Inspections webpage publishes, by permit type, exactly which inspections are required and what each one checks (including a dedicated 'PV (Solar) & Energy Storage' section). 90% · department page
• What must be on site at inspection? The approved construction plans (digital or printed) must be on site for the inspection. 85% · department page

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 — the Accela permit record is marked finalized once all required inspections pass ('Once all inspections have been approved your permit will be finalized'); a separate Certificate of Occupancy is issued only for qualifying residential/commercial occupancy permits, not as the standard PV/ESS sign-off document. 75% · department page