Town of Los Altos Hills

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% · municipal code
• What does this authority permit itself, and what does it delegate? Both 92% · municipal code
• Is a permit required for a residential rooftop PV system? Yes 95% · municipal code
• Is there a separate electrical permit, or is it combined? Combined 80% · fee schedule
• Is a HOA or architectural approval required first? No 65% · municipal code (absence-based inference)
• Is there a historic-district review? Not clearly stated for solar specifically; likely No for most parcels 45% · municipal code (partial search)
• Is a wind or windstorm certification required? No dedicated windstorm certification found; wind loading is a design parameter under the adopted CBC/CRC rather than a separate certificate 55% · absence-based inference (no dedicated design-criteria handout with a stated wind speed was located this run)
• Is a Specific Use Permit or Council approval ever required? Yes — and there is a real, unresolved tension between two of the Town's own codified chapters. LAHMC §8-9.06 (the AB 2188 expedited-solar ordinance) allows a Conditional Use Permit to be required ONLY if the Building Official/Planning Director finds a specific, documented adverse health/safety impact. Separately, Title 10 Zoning §10-2.301(a) requires a discretionary 'Site Development Permit' (Administrative Review by the Planning Director, no notice/hearing) for: (1) any spa/solar panel/dish antenna exceeding 3 ft height or 30 sq ft of development area; (8) any structure supporting ground-mounted PV facilities 6 ft/900 sq ft or larger; and (9) ANY rooftop PV installation, regardless of size, that raises the roofline by less than 18 inches (i.e., ordinary flush-mounted residential solar). This zoning-level Administrative Review currently carries an $8,408 'Minor Administrative Review' fee (2026 Planning Fee Schedule, eff. 8/1/2026) — far above the Gov. Code §65850.55-capped $450+$15/kW solar permit fee. None of the Town's own solar-specific handouts (Solar Photovoltaic Installation Requirements, SolarAPP+ guide) mention this zoning permit or its fee. 85% · municipal code + fee schedule
• Is there a system-size cap on residential generation? No single hard cap; at least three different, uncoordinated size figures apply depending on path 85% · municipal code + department guide

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 78% · permit application form
• Must the contractor be registered with this authority before applying? Yes 75% · municipal code + permit application form
• Is a homeowner permitted to self-install and self-permit? Yes 80% · 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? For SolarAPP+-eligible systems (<=38.4kW on a detached 1-2 family dwelling/townhome/accessory structure): one combined PDF (Building Permit Application + SolarAPP+ Approval Document + SolarAPP+ Approval ID + manufacturer's equipment specifications) plus the SolarAPP+-approved plan set, submitted through the Town's eTRAKiT portal. For non-eligible/larger systems, the Town's general Building Permit Submittal Checklist applies: site plan, roof plan, floor/structural plans, and building elevations (which must show 'solar equipment' among exterior features), plus structural calculations and Title 24 energy compliance documentation as applicable. 90% · department guide + published checklist
• How many copies, and in what format? SolarAPP+ path: one combined PDF submittal + one PDF plan set (all electronic, via eTRAKiT). Standard (non-SolarAPP+) path per the Town's general checklist: 4 sets of Site and Architectural plans plus structural calculations (minimum 24in x 36in sheets, drawn to at least 1/4in = 1ft) and 2 sets of Engineering plans where required. 85% · published checklist
• Is a site plan required, and what must it show? Yes. For standard (non-SolarAPP+) submittals, the Town's general checklist requires a Site Plan (accurate boundary survey, min 1/8in=1ft) showing property lines/dimensions, north arrow, vicinity map, scope of work, existing/proposed structures and distances to property lines, and a Roof Plan/Building Elevations sheet that must depict roof hip/ridge/valley lines and 'solar equipment' among exterior features and fire pathways per the 2019 CRC or CA Fire Marshal Guidelines. For SolarAPP+ submittals, the SolarAPP+-approved plan set (which includes an equivalent site/roof layout) substitutes for this. 85% · published checklist
• Is a one-line / three-line diagram required? Yes 80% · department handout + municipal code (inference by analogy from adjacent generator-permit requirements)

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? SolarAPP+ (for eligible systems, generating an Approval ID submitted into the Town's permitting system) plus the Town's eTRAKiT portal (trakit.losaltoshills.ca.gov) for permit issuance, fee payment and inspection scheduling. 90% · department guide
• Can the whole application be completed online? Yes, for SolarAPP+-eligible systems submitted by a licensed contractor 85% · department guide
• What does a residential solar permit cost? $450 flat for residential PV up to 15kW AC, plus $15/kW for capacity above 15kW 95% · published fee schedule
• How is the fee calculated? Tiered 85% · published fee schedule
• Is there a separate plan-check fee? No (for the itemized solar fee) 60% · published fee schedule (inferred from structure, not stated explicitly)

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? Per LAHMC §8-9.05(a): the Building Division shall issue the permit within three business days of a complete application meeting the approved checklist/standard plan, 'and whenever possible... the same day of receipt.' 92% · municipal code
• How long is an issued permit valid before it expires? 12 months (365 days) from permit issuance for a solar-only permit valued under $100,000 (LAHMC Table 2, §8-10.04, 'All Other Construction Projects'), with up to two 6-month extensions available on written request at least 14 days before expiration (§8-10.05). 82% · municipal code
• Which utility handles interconnection here? Pacific Gas & Electric (PG&E) 82% · town public communications (secondary; utility's own territory map not independently checked 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? 2020 82% · municipal code
• Which building code edition is in force? 2022 California Building Code / 2022 California Residential Code 85% · municipal code
• Which fire code edition is in force? 2022 California Fire Code 85% · municipal code
• Are there local amendments to any of the above? Yes 90% · municipal code
• What is the installation judged against? The adopted 2022 CEC, plus IEEE standards, accredited testing-laboratory listing (e.g. UL), and CPUC safety/reliability rules where applicable 88% · 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? From the Town's own 'Solar Photovoltaic Installation Requirements' handout (2019 CEC Art. 690 basis, dated 6/17/2020): hip-roof layouts require a 3-ft-wide clear access pathway from eave to ridge on each slope with panels; single-ridge roofs require TWO 3-ft-wide pathways (eave to ridge) on each slope; panels near hips/valleys must be no closer than 18 inches (adjacent placement allowed only when panels are on one side of an equal-length hip/valley); and panels must stay at least 3 ft below the ridge for fire department smoke ventilation. 85% · published handout (dated; code-cycle citation is stale)

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? Rapid shutdown is required via the state-adopted electrical code (NEC 690.12, incorporated through the 2022 CEC/2020 NEC adopted at LAHMC §8-1.3.01); no Town document states this in its own words or cites '690.12' by section number. 60% · municipal code (control-proven absence of local text; requirement applies by code reference)

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? A DC-side marking/placard reading 'WARNING: PHOTOVOLTAIC POWER SOURCE', placed on interior and exterior DC conduit, enclosures, raceways, cable assemblies, junction boxes, combiner boxes and disconnects, and adjacent to the main service disconnect. 82% · published handout (dated)
• Does the authority specify placard wording of its own? Yes 82% · published handout (dated)
• Does it specify letter height, colour or material? Yes — capital letters, minimum 3/8 inch height, white lettering on a red background; materials must be reflective and weather-resistant. 82% · published handout (dated)
• Where must the labels be placed? On the interior and exterior DC conduit, enclosures, raceways, cable assemblies, junction boxes, combiner boxes and disconnects, and placed adjacent to the main service disconnect where it is clearly visible from where the disconnect is operated. 82% · published handout (dated)

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 82% · municipal code
• Are batteries permitted, and under what conditions? Yes, conditionally, with a codified local fire/life-safety amendment for interior ESS 82% · municipal code
• Is there a separate ESS permit or inspection? No dedicated separate ESS permit type; ESS is folded into the same 'Solar & ESS Permits' process as PV, but priced differently (by project valuation rather than by kW). 70% · department guide + fee schedule
• Is a ground mount treated as a structure? Likely Yes for anything beyond a small accessory-scale array, based on zoning treatment rather than an explicit statement 60% · municipal code (inferred)

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: call (650) 947-2501 to schedule; the Town's eTRAKiT portal is also used for online permits/payment and is referenced as an inspection-scheduling channel in the Town's own indexed content. 85% · department page
• How much notice is required? Recommended 3-4 business days in advance; same-day inspections are not provided. 88% · department page
• Are same-day or AM/PM windows offered? AM or PM preference only (no same-day, no guaranteed narrow window) 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? Yes 90% · municipal code

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 small residential rooftop solar: a single inspection performed by the Building Division (LAHMC §8-9.05(f)-(h)); if the system fails, a follow-up inspection is authorized. Generator installations (a related electrical scope) require an underground-conduit-trench inspection, a slab-rebar inspection (if applicable), and one final Building inspection performed after any required Planning/Engineering/Fire finals. 78% · municipal code + department handout
• Is a rough-in or mid-roof inspection required? No 82% · municipal code

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 Town of Los Altos Hills 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? $163 per half-hour (reinspection) 90% · published fee schedule
• How are corrections issued and cleared? For application-stage deficiencies: LAHMC §8-9.05(e) requires a written correction notice detailing all deficiencies be sent to the applicant for resubmission. For a failed field inspection: §8-9.05(h) authorizes a subsequent inspection (which 'need not conform to the requirements of this chapter,' i.e. the one-inspection/turnaround guarantees no longer apply after a failure), but no separate written-correction-notice procedure for post-inspection failures is described. 75% · municipal code