City of Cotati

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 92% · department page
• What does this authority permit itself, and what does it delegate? Both 82% · fee schedule
• Is a permit required for a residential rooftop PV system? Yes 95% · published checklist
• Is there a separate electrical permit, or is it combined? Combined 78% · fee schedule
• Is a Specific Use Permit or Council approval ever required? Likely No for SolarAPP+-eligible systems 55% · department page + inference
• Is there a system-size cap on residential generation? No hard residential size cap found; the fee schedule tiers a per-kW rate above 15 kW rather than prohibiting larger systems. 62% · fee schedule + inference

Several authorities require the electrical permit to be pulled by a licensed electrician, or require the contractor to be registered with them BEFORE applying. Registration is not same-day. This is second on the list rather than fourth because it is the step most likely to stop the job before the drawings matter.

• Who is allowed to pull the electrical permit? Either 85% · permit application form
• Must the contractor be registered with this authority before applying? Yes 85% · permit application form + fee schedule
• Is a homeowner permitted to self-install and self-permit? Yes 85% · permit application form

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? Per the city's PV checklist: general project/applicant info, a completed system-detail worksheet and site plan, a basic site plan (structure + equipment location), array configuration/placement with dimensioned access pathways, an electrical single-line drawing (main/sub panel size, service adequacy, grounding, combiner/junction box, AC/DC disconnect, conduit sizing, inverter string/branch-circuit sizing, conductor/grounding methods), panel/disconnect/conductor signage, manufacturer cut sheets for modules/racking/mounting/grounding/inverters, and equipment listing/testing-agency approvals. 92% · published checklist
• How many copies, and in what format? Electronic only — the city's Building Permit Process page states 'we accept electronic plans set submittals ONLY,' via email to permits@cotaticity.gov or the Cloudpermit portal (large files via WeTransfer/Dropbox); no paper-copy count applies. 82% · department page
• Is a site plan required, and what must it show? Yes — a 'basic site plan' showing location of structure and equipment, plus array configuration/placement of equipment and modules on the roof with dimensioned access and pathways. 90% · published checklist
• Is a one-line / three-line diagram required? Yes 92% · published checklist
• Are string and conductor calculations required? Yes 75% · published checklist
• Is a structural PE stamp required, and at what threshold? Yes, conditionally — the city's own worksheet states: 'RAFTERS THAT ARE OVER-SPANNED OR IF THE ARRAY IS OVER 5 LBS. PER SF., DESIGN BY A LICENSED PROFESSIONAL MAY BE REQUIRED.' 90% · 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? Cloudpermit (us.cloudpermit.com/cotaticity) for general building permits, and SolarAPP+ (gosolarapp.org, jurisdiction=Cotati) for eligible residential rooftop PV instant permitting. 90% · department page
• Can the whole application be completed online? Yes 88% · department page
• What does a residential solar permit cost? $450 flat for residential roof-mount up to 15 kW; $15/kW for each kW over 15 kW (residential). Commercial: $1,000 flat up to 50 kW, $7/kW from 51-250 kW, $5/kW above 250 kW. 95% · published fee schedule
• How is the fee calculated? Tiered 90% · published fee schedule
• Is there a separate plan-check fee? No 72% · published 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? Instantaneous for SolarAPP+-eligible systems (automated online issuance); general over-the-counter permits '2-3 business days,' up to 30 days for larger projects not using SolarAPP+. 85% · department page
• Which utility handles interconnection here? Pacific Gas & Electric (PG&E) for interconnection/wires; Sonoma Clean Power (a CCA) for generation/billing on the same PG&E-delivered service. 85% · utility's own page (not PowerToChoose)

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 the basis of the 2025 CEC, statewide-mandatory as of 1 Jan 2026) 58% · inference (statewide code cycle) + stale city document
• Which building code edition is in force? 2025 California Building Code (based on the 2024 IBC), by operation of the statewide triennial code cycle 55% · inference (statewide code cycle)
• Which fire code edition is in force? 2025 California Fire Code (based on the 2024 IFC), by operation of the statewide triennial code cycle 55% · inference (statewide code cycle)
• What is the installation judged against? Per the city's own checklist: 'adoption and effective date of 2022 California Code of Regulations, Title 24 Part 2.5, and/or local amendments' (i.e., the state-adopted CBC/CRC/CEC/CFC as locally amended). 70% · published checklist (dated reference)

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? Hip roof: one 3-ft-wide clear pathway from eave to ridge per roof slope with panels. Single-ridge roof: two 3-ft-wide pathways from eave to ridge per slope. Hips/valleys: panels no closer than 18in to a hip or valley when panels are on both sides (may be placed directly adjacent if only one side is used and the hip/valley sides are of equal length). Modules must be located no higher than 3 ft below the ridge. Non-conforming designs are directed to contact Rancho Adobe Fire Protection District (now Sonoma County Fire District) before submittal. 92% · 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? Not stated in the city's own words — the checklist cites CEC Article 690 generally and CEC Sec. 690.47(C)(2) for the grounding-electrode conductor, but never uses the phrase 'rapid shutdown' or cites §690.12 specifically, even though the 2025 CEC (adopted statewide, based on 2023 NEC) applies §690.12 by reference. 55% · published checklist (control-checked absence)

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? DC disconnect sign reading 'PHOTOVOLTAIC POWER SOURCE' with rated MPP current/voltage and max system/circuit voltage; an inverter-OCPD-and-AC-disconnect sign with AC output current and nominal AC voltage; a microinverter-system label on the exterior of the main service panel reading 'Microinverter System Solar Breaker Inside Panel is PV System Disconnect'; and general signage 'on panel(s), disconnects and transmission line conductors.' 85% · published checklist
• Does the authority specify placard wording of its own? Yes, for one specific case — the checklist gives verbatim required wording for the microinverter disconnect label: 'Microinverter System Solar Breaker Inside Panel is PV System Disconnect.' Other signage content (DC/AC disconnect placards) is specified by required data fields (voltage/current ratings) rather than fixed prose, deferring general format to UL 969 / CEC Article 690. 75% · published checklist
• Does it specify letter height, colour or material? Colour and material: 'red background and white lettering resistant to fading pursuant to UL 969 and California Electrical Code Article 690, and permanently affixed.' No specific numeric letter-height figure was found in the city's own document. 78% · published checklist
• Where must the labels be placed? On the panel(s), disconnects, and transmission line conductors; the PV disconnect itself must be in 'a readily accessible location and located together when possible' with the main service disconnect. 80% · published checklist

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.

• Must equipment be on a specific approved list? Yes 90% · published checklist
• Are batteries permitted, and under what conditions? Yes, conditionally — Sonoma County Fire District's current fee schedule (eff. 18 Sep 2025) requires an annual 'Battery System Stationary Storage / Energy Storage System' operational permit ($521 flat) for systems 'more than 50 gallons or for stationary and mobile energy storage systems regulated by [CFC] Section 1207.' The city's own building-side PV checklist and fee schedule are otherwise silent on battery-specific mounting/venting rules. 72% · fire district fee schedule/application form
• Is there a separate ESS permit or inspection? Yes, at the fire-district level — a separate annual Battery System Stationary Storage operational permit ($521) is required by Sonoma County Fire District; no separate ESS line exists in the city's own building-permit fee schedule (which appears to fold ESS into the general PV/solar permit if bundled with a PV system). 68% · fee schedule (city, control-checked) + fire district fee schedule
• Is a specific mounting system or attachment spacing required? No city-mandated proprietary mounting system; the checklist requires plans to show manufacturer-specific 'style, diameter, length of embedment of bolts or other approved fastener' since 'depending on your manufacturer's specifications attachment methods may vary.' 75% · 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? Phone (voicemail) — for SolarAPP+-eligible systems, contact Community Development at 707-665-3632 to schedule. 85% · department page
• How much notice is required? 24-48 business hours after SolarAPP+ approval before an inspection may be scheduled. 62% · department page
• Are same-day or AM/PM windows offered? No same-day option found; inspections for SolarAPP+ jobs are booked into fixed weekly windows: Mondays & Wednesdays 9am-noon, Thursdays 1-4pm. 75% · 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 85% · 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 SolarAPP+-eligible systems the process implies a single final inspection: register/submit design, pay fees and receive approved plans online, then wait 24-48 business hours before scheduling one inspection. 55% · department page (inference)

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.

Nothing recorded for City of Cotati on this step yet — 3 questions checked and found unpublished. The guidance above is general.

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.

• Is there a re-inspection fee? $325/hour (1-hour minimum) for re-inspection; the same $325/hour (2-hour minimum) rate applies to inspections outside normal business hours. 88% · published fee schedule