City of Lafayette

A city address is usually permitted by the city, not the county — but not always, and some authorities keep building and hand electrical to someone else. Getting this wrong costs the whole submittal, because every requirement below belongs to whoever actually holds jurisdiction. Check the overlays in the same pass: an HOA, a historic district, a windstorm certification or a system-size cap can reshape the design, and all of them are cheaper to find now than after the array is laid out.

• Is this authority the AHJ for residential solar at this address? Yes 95% · department handout
• What does this authority permit itself, and what does it delegate? Delegated 95% · department handout
• Is a permit required for a residential rooftop PV system? Yes 96% · municipal code
• Is there a separate electrical permit, or is it combined? Combined 85% · fee schedule
• Is there a historic-district review? Yes, but narrow — only for city-council-designated 'landmark' properties. 82% · municipal code
• Is a Specific Use Permit or Council approval ever required? No 72% · city webpage
• Is there a system-size cap on residential generation? 10 kW AC nameplate / 30 kW thermal, flush roof-mounted, on a detached single-family dwelling or duplex, not exceeding the zoning district's building height limit — codified at LMC §3-1002(e) (Ord. No. 642, 2015), tracking Gov. Code §65850.5's 'small residential rooftop solar energy system' definition. This is a GATE for the ministerial/expedited path, not a hard ceiling: larger or non-flush systems are still permitted but go through standard County plan check and (per the county's own PV submittal checklist item 8, which names Lafayette by name) Lafayette Planning Dept. sign-off. No separate zoning height allowance for solar exists: LMC §6-513's enumerated height-limit-exception list (chimneys, towers, flagpoles, water tanks, 'necessary mechanical appurtenances,' etc.) does not name solar collectors — a control-checked omission, not silence. 90% · municipal code

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 70% · municipal code
• Is a homeowner permitted to self-install and self-permit? Yes 78% · 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? Complete digital plan set (roof/site plan showing module & equipment locations, single-line diagram, manufacturer spec sheets for modules/inverters/racking, grounding instructions, labels sheet per CEC Art. 690) plus the county's Residential PV Eligibility & Structural Checklist and, if any structural criteria item fails, engineer-stamped calculations. 90% · published checklist
• How many copies, and in what format? Digital: one bookmarked multi-page PDF, 11x17 minimum page size, landscape, generated from drafting software (no scans), max 100MB, 3.5in x 6in blank column reserved for county stamps. Paper (in-office only): 3 sets, 11x17 minimum. 88% · published checklist
• Is a site plan required, and what must it show? Yes — a roof plan (for roof-mount) or site plan (for ground-mount) showing module/array locations, existing roof framing, inverter/battery locations and all system equipment, plus a separate roof-access/pathway diagram showing disconnect and access-point locations. 88% · published checklist
• Is a one-line / three-line diagram required? Yes 92% · published checklist
• Are string and conductor calculations required? Yes 78% · published checklist
• Is a structural PE stamp required, and at what threshold? Required only if the county's 'Required Structural Criteria for Residential Flush-Mounted Rooftop Solar Arrays' worksheet has any item answered 'No' (e.g. non-conforming roof slope/rafter spacing vs. the anchor-spacing table, array weight over 4 psf PV/5 psf thermal, coverage over half the roof, sagging/altered roof structure, non-conforming anchor fasteners) — then project-specific drawings and calculations stamped by a CA-licensed Civil or Structural Engineer must be attached; if all items are 'Yes' no stamp is required. 78% · 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? Contra Costa County ePermits Center (epermits.cccounty.us) is the portal used for the actual building/electrical permit (since Lafayette contracts building to the county). Lafayette's own GeoCivix portal (lovelafayette.geocivix.com) is used only for the city's Zoning Plan Check step, which compliant small rooftop PV is exempt from. 90% · department handout
• Can the whole application be completed online? Yes 88% · department page
• What does a residential solar permit cost? $272 minimum for a residential PV system ≤15 kW AC ($86 Building Permit/Inspection + $86 Plan Check + $100 Electrical Review 'per permit'), plus $15/kW above 15 kW AC. Thermal systems: $258 minimum (≤10 kWth) plus $15/kWth above 10 kWth. SolarAPP+ adds a separate $35 PV / +$25 ESS fee paid directly to SolarAPP+. Con Fire charges no residential PV fee (notification only); ESS reviewed by Con Fire adds $944 minimum plus $516 minimum for UL 9540A review. 90% · fee schedule
• How is the fee calculated? Tiered 90% · fee schedule
• Is there a separate plan-check fee? Yes 90% · 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? Not published as a stated number of business days for standard plan check. SolarAPP+-eligible systems get automated/instant permit issuance once the SolarAPP approval is submitted to the county. 55% · department page
• Which utility handles interconnection here? PG&E 92% · city webpage
• Where does the utility sit in the sequence? Parallel 55% · utility tariff (not independently re-verified this run)

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? Other — recorded as written, flagged as likely erroneous. Contra Costa County DCD's 'Current Building Codes, Ordinances & Technical Guidelines' bulletin (updated 1/2/2026, naming Lafayette by name under Climate Zone 12) states the '2025 California Electrical Code Part 3 (based on the 2020 National Electrical Code)' is in force. Lafayette's own codified municipal code (Municode, current through Ord. No. 697, adopted 28 Jul 2025) still recites '2019 California Electrical Code' at LMC §76-2.002 — a codifier lag. Note the county document's '2020 NEC' basis for the '2025 CEC' does not match the generally accepted statewide fact that the 2025 CEC is based on the 2023 NEC; recorded here exactly as the county document states it, not silently corrected. 45% · adopting regulation
• Which building code edition is in force? 2025 California Building Code Part 2 / 2025 California Residential Code Part 2.5 (both based on the 2021 IBC/IRC), per Contra Costa County DCD's Current Building Codes bulletin (updated 1/2/2026), which names Lafayette explicitly. Lafayette's own codified municipal code (Ord. No. 697, current through 28 Jul 2025) still recites the 2019 CBC/CRC via the county's Title 7 reference at LMC Ch. 3-3 — a codifier lag; the county's more recently dated bulletin is treated as reflecting current practice. 70% · adopting regulation
• Which fire code edition is in force? 2025 California Fire Code, adopted by Contra Costa County FPD Ordinance No. 2025-14 (passed 18 Nov 2025, operative 1 Jan 2026). 85% · adopting regulation
• Are there local amendments to any of the above? Yes 88% · municipal code
• What is the installation judged against? 2025 CEC/CBC/CRC/CFC as adopted and amended via Contra Costa County's Title 7 Ordinance Code (incorporated into LMC Ch. 3-3 by reference), plus LMC Ch. 3-10 (Solar Energy Systems, citing Gov. Code §65850.5) and LMC Ch. 3-5 (local Fire Safety/High Fire Hazard Area amendments). 78% · municipal code

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? Con Fire's own 'Solar Application (PV)' plan-review form (citing the 2022 CFC — one cycle stale against the now-current 2025 CFC) requires: for Group R-3 buildings, at least two 36-inch-wide pathways from lowest roof edge to highest ridge (at least one on the street/driveway side) per CFC 1205.2.1.1; for other occupancies, a 6 ft (or 4 ft where either building axis is ≤250 ft) clear perimeter per CFC 1205.3.1; interior pathways at 150 ft intervals with 4 ft clearance to skylights/vents per CFC 1205.3.2; and DC conductors/raceways routed as close as possible to the ridge, hip or valley to an outside wall per CFC 1205.2.4/1205.3.4. 88% · fire agency plan-review form

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 — Con Fire's Solar Application (PV) form requires a permanent rapid-shutdown label under CFC 1205.5.1 with specified verbatim wording, but the form does not itself name a specific NEC/CEC edition or 690.12 subsection for the functional rapid-shutdown requirement; none of the county's PV submittal templates (2015/2020 vintage) reference CEC 690.12 by number. 70% · fire agency plan-review form

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? Multiple placards: (1) service-equipment/inverter/disconnect labels per CEC 690/705 (inverter output overcurrent-device warning, ungrounded-DC-conductor warning, PV AC and DC disconnect ratings, ground-fault warning, live-terminal warning) per the county's Central/String Inverter Solar Plan Template; (2) 'WARNING: PHOTOVOLTAIC POWER SOURCE' markings on exposed DC raceways/combiner boxes at least every 10 ft, per CRC R331.2/CFC 605.11.1 (Con Fire's PV review sheet); (3) a rapid-shutdown label per CFC 1205.5.1 if the system has rapid shutdown. 85% · published plan template
• Does the authority specify placard wording of its own? Yes 90% · fire agency plan-review form
• Does it specify letter height, colour or material? 3/8 inch (20-point) minimum letter height is treated as the floor; Con Fire's DC-conductor markings must be white lettering on a red background in weather-resistant reflective material; the rapid-shutdown label must be uppercase, minimum 3/8 inch, black lettering on a yellow background. The county's plan template separately notes ANSI Z535.4 guidance and suggests a phenolic plaque with contrasting text/background colors. 85% · fire agency plan-review form
• Is a site plan / facility map placard required, and what must it show? The county's Residential PV Eligibility Checklist requires 'a diagram of the roof layout of all panels, modules, clear access pathways and approximate locations of electrical disconnecting means and roof access points' to be attached to the submittal (functioning as the as-built facility/roof map); separately, the county's plan template calls out CEC 705.12's requirement for a 'permanent plaque or directory denoting all electric power sources on or in the premises' at the main service equipment. 78% · published checklist
• Where must the labels be placed? At the main service panel/service disconnect and inverter output disconnect; at DC combiner/junction boxes; along exposed DC raceways/conduit at intervals of every 10 ft and at any enclosure with unused conduit openings; and (for rapid shutdown) at a location conspicuous to first responders per CFC 1205.5.1. 82% · fire agency plan-review form

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, in effect 60% · published checklist
• Are batteries permitted, and under what conditions? Yes — the county issues a distinct 'Building - Residential ESS/Battery Storage' permit requiring a site plan, electrical single-line diagram, structural/mounting details and manufacturer specifications. Con Fire's current fee schedule (effective 13 Jul 2026, under Ordinance No. 2026-07 adopted 12 May 2026) charges a $944 minimum fee for 'Battery Systems/Energy Storage' plus a separate $516 minimum for 'UL9540A Review.' 90% · fee schedule
• Is there a separate ESS permit or inspection? Yes 90% · fee schedule
• Is a ground mount treated as a structure? Effectively treated as a reviewable structure, though no explicit zoning 'accessory structure' classification for ground-mount solar was located within available time. The county's own Power Permits page states 'Planning Approval is required for Ground Mounted systems or solar canopies' (unlike flush roof-mount, which is zoning-exempt in Lafayette), and the county's PV digital-submittal checklist item 9 requires ground-mounted plans to be 'approved by the City or County Planning Department AND the Sanitary OR Environmental District prior to submittal.' 62% · department page
• Is there a local rule on service upgrades or busbar sizing? For the expedited/eligibility-checklist path only: the service panel must be a single-phase 120/240V panel with a busbar rating of 200A or less (Contra Costa County DCD Residential PV Eligibility Checklist, Electrical Requirements item C). This is an eligibility gate for the streamlined review path, not a blanket local amendment overriding CEC 705.12's general backfeed/120%-busbar-rule for all installations. 65% · published checklist
• Is a specific mounting system or attachment spacing required? Yes — the county's 'Required Structural Criteria for Residential Flush-Mounted Rooftop Solar Arrays' worksheet sets maximum horizontal anchor spacing by roof slope and rafter spacing (e.g. up to 6'-0" at flat-to-6:12 slope with 24" o.c. rafters, down to 1'-4" at steep slopes), requires 5/16" diameter lag screws with 2.5" rafter embedment (or manufacturer-specified equivalents), and caps array weight at 4 psf (PV) / 5 psf (thermal) with coverage of no more than half the roof area. 80% · 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 or Phone 90% · department page
• How much notice is required? Same-day inspection requests are accepted through the county's automated phone system until 5:30 AM Monday-Friday for the building final. Con Fire's separate PV final inspection requires a minimum of two working days' notice and a confirmation call between 8:00-8:30 AM the morning of the inspection. 88% · department page
• Are same-day or AM/PM windows offered? Yes — the county posts 3-hour inspection time-frame windows on its Daily Building Inspection Schedule (posted after 8:45 AM each business day), and same-day requests are accepted via the automated phone line until 5:30 AM. 88% · 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? Delegated 90% · department handout
• If delegated, to whom? Contra Costa County Building Inspection Department (CCCBID) for building/electrical; Contra Costa County Fire Protection District (CCCFPD) for the separate fire/PV final inspection. 92% · department handout

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? (1) Lafayette Planning Dept. zoning plan check — skipped for compliant flush-mount small PV; (2) CCCFPD fire plan review if triggered, or (routinely) the no-fee Photovoltaic Notification Form; (3) Central Contra Costa Sanitary District review if applicable (mainly ground-mount work near sewer easements); (4) CCCBID building-permit plan check and issuance; (5) CCCBID building/electrical final inspection; (6) a separate CCCFPD PV final inspection where a fire application/notification was filed. 75% · department handout

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 80% · fire agency plan-review form
• What must be on site at inspection? The building permit card and reviewed/stamped building plans must be on site for the county inspection, and a color, 11x17-minimum copy of the approved plans is required for the field inspector — the county's PV eligibility checklist warns that failing to provide this 'may result in a $100 re-inspection fee' (a stale figure; the current schedule sets re-inspection at $150). 85% · department page
• Does the inspector verify labels and listings? Yes, in effect 65% · fire agency plan-review form

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 82% · municipal code
• Who notifies the utility for PTO? Installer 50% · utility practice (inferred, not independently re-verified this run)
• Is there a re-inspection fee? $150 per inspection trip 90% · fee schedule