City of Palo Alto

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% · authority's own handout
• What does this authority permit itself, and what does it delegate? Both 90% · authority's own handout
• Is a permit required for a residential rooftop PV system? Yes 95% · authority's own handout
• Is there a separate electrical permit, or is it combined? Combined 80% · fee schedule
• Is a HOA or architectural approval required first? No 60% · absence in authority's own checklist + state law context
• Is there a historic-district review? No — a rooftop PV retrofit on an existing single-family home does not by itself trigger Palo Alto's Historic-District/Individual Review (IR) process. 75% · authority-adopted design guideline (PAMC 18.12.110)
• Is a wind or windstorm certification required? No 60% · absence in authority's own handout; California has no TDI-equivalent program
• Is a Specific Use Permit or Council approval ever required? Only indirectly: Planning approval (not a Specific Use Permit or Council hearing) is required if a new, separate structure must be built to support the PV system (e.g., some ground-mount installations). Standard roof-mounted residential PV does not require Planning Commission or Council approval. 80% · published checklist
• Is there a system-size cap on residential generation? No stated numeric residential system-size cap beyond CPAU's Net Energy Metering program limit of 1 MW per generating facility. 70% · utility's own rule/regulation

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 55% · inference from authority's own document (absence of restriction)
• Must the contractor be registered with this authority before applying? No 60% · inference from absence across three authority documents
• Is a homeowner permitted to self-install and self-permit? Yes 60% · inference from authority's own FAQ + state law

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? Building Permit Application; CPAU Photovoltaic Electric Load Sheet; Residential Electric Load Calculator; CPAU signed & approved Interconnection Agreement; site/roof plan; three-line electrical diagram; structural attachment details/calculations; waterproofing details; signage & labeling plan; manufacturer equipment spec sheets & installation instructions. 95% · published checklist
• How many copies, and in what format? Electronic submission only, via the Palo Alto Online Permitting System (OPS)/Accela Citizen Access (ACA) — no paper copies. Plan sheets, when produced, must be printable at 11"x17" minimum up to 30"x42" maximum, minimum 10-point (1/8") text. 90% · published checklist
• Is a site plan required, and what must it show? Yes — site/roof plan must show existing main panel and meter (with panel amperage), proposed PV panel and related equipment locations (panelboards, disconnects), existing roof penetrations (vents, chimneys, skylights), and property-line setback distances for any equipment not attached to the structure; elevation plans required if equipment is installed outside in a flood plain. 95% · published checklist
• Is a one-line / three-line diagram required? Yes — a three-line electrical diagram is required (not described as a one-line diagram). 95% · published checklist
• Are string and conductor calculations required? Yes 70% · published checklist
• Is a structural PE stamp required, and at what threshold? Conditionally required — a PE stamp is called for when structural calculations are needed (e.g., ballast systems, standing-seam roofs, tilt-up systems), listed as 'PE-stamped plans and calculations' under the Structural Calculation submittal item. No numeric system-size or roof-type threshold is stated in the published handout. 60% · published checklist (threshold not stated)
• Is an electrical PE stamp required, and at what threshold? No electrical PE stamp requirement is stated for standard residential PV/ESS. 65% · absence in authority's own handout

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), branded locally as the 'Palo Alto Online Permitting System (OPS),' for the building/electrical permit; SolarAPP+ (gosolarapp.org) for the optional expedited PV pre-approval; the CPAU 'Utilities' tab within the same ACA portal for the Electric Utilities Pre-Approval. 95% · authority's own handout
• Can the whole application be completed online? Yes 90% · authority's own FAQ
• What does a residential solar permit cost? SolarAPP+ PV only: $655/permit (instant permit). SolarAPP+ PV+ESS: $1,331/permit (instant permit). Traditional review — Residential PV ≤10kW: $1,481/permit; PV >10kW: $1,868/permit; PV reinstallation: $1,002/permit. ESS (single-family/duplex): $1,859/permit. 95% · fee schedule
• How is the fee calculated? Tiered 90% · fee schedule
• Is there a separate plan-check fee? No 75% · 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? SolarAPP+-eligible systems: instant, automated same-day issuance ('available as instant permit'). For projects routed through standard plan review (e.g., service upgrades, ESS, ineligible PV), the department's own materials do not publish a specific business-day turnaround. 70% · fee schedule + absence of a published standard-review SLA
• How long is an issued permit valid before it expires? 12 months from issuance (permit becomes invalid if work is not commenced within 12 months, or is suspended/abandoned for 12 months); up to 3 extensions/reactivations of up to 180 days each may be granted by the Chief Building Official, more requires Council approval; all work must reach final inspection within 48 months of issuance. 95% · adopting ordinance + authority's own FAQ
• Which utility handles interconnection here? City of Palo Alto Utilities (CPAU) — a municipally owned electric utility. Palo Alto is not in PG&E territory. 98% · utility's own rule/regulation
• Where does the utility sit in the sequence? Before permit 90% · authority's own instructions + Rule 27

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 90% · adopting ordinance / municipal code chapter
• Which building code edition is in force? 2025 California Building Code and 2025 California Residential Code (Title 24, Parts 2 and 2.5), adopted with local amendments by Ordinance No. 5674 amending PAMC Chapter 16.04, effective 31 days after passage on 20 Oct 2025. 90% · enacted ordinance
• Which fire code edition is in force? 2025 California Fire Code (Title 24, Part 9), adopted with local amendments as PAMC Chapter 15.04. 90% · adopting ordinance / municipal code chapter
• Are there local amendments to any of the above? Yes 95% · municipal code chapter
• What is the installation judged against? The California Building Code, California Residential Code, California Electrical Code, California Fire Code (current adopted editions), CPAU's Rule 27 (incorporating EUSERC 501), and the Palo Alto Municipal Code, as stated on the cover page of both the PV and ESS handouts. 95% · authority's own handout

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? Fire-code roof access pathways and ridge setbacks apply per adopted CFC §1204.2/§1204.2.1 (Pathways to Ridge §1204.2.1.1, Setbacks at Ridge §1204.2.1.2, Emergency Escape/Rescue Openings §1204.2.2), with stated exceptions for Occupancy Group U structures and for flat roofs with a slope of 2:12 or less. The published handout does not restate the numeric setback distances itself, only the code citations and exceptions. 85% · authority's own handout (citing adopted fire code)

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, tied to the CEC edition in force. The handout distinguishes current rapid-shutdown signage (CFC 1204.5.1, CEC 690.56(C)(3) 'RAPID SHUTDOWN SWITCH FOR SOLAR PV SYSTEM') from legacy labeling for systems installed under previous rapid-shutdown code editions (CEC 690.56(B)/(C)(1)(a)/(C)(1)(b)/(C)(2)). 90% · authority's own handout

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? Service-equipment location placards (CEC 705.10 directory), PV AC system disconnect label (690.13(B)), PV DC equipment disconnect label (690.53), interactive-point-of-interconnection labels (690.54, 705.12(B)(2)(3)(b)/(c)), DC conduit/raceway marking (690.31(G)(3)/(4)), de-rated main breaker label, CPAU supply-side-tap caution label, and rapid-shutdown labeling (690.56/CFC 1204.5.1). 95% · ordinance/utility spec (authority's own handout)
• Does the authority specify placard wording of its own? Yes 95% · authority's own handout
• Does it specify letter height, colour or material? Yes — labels exposed to sunlight must be phenolic; conduit labels must be permanent and weather-resistant; general label background/lettering is red background with white lettering (two-color minimum; a three-color illustration in the handout is for illustration only); DC conduit/raceway marking and the rapid-shutdown-switch label require a minimum 3/8" text size. 90% · authority's own handout
• Is a site plan / facility map placard required, and what must it show? Yes — an Interconnected Power Production Sources Directory (CEC 705.10) is required at service equipment locations, shown in the handout as illustrated 'You Are Here' directory/facility maps (Illustrations 2, 3A, 3B, 3C) identifying the main service panel, rapid shutdown location, and any PV/ESS disconnect locations relative to each other. 85% · authority's own handout, citing CEC 705.10 + local illustration
• Does the UTILITY specify placards beyond the AHJ's? Yes — CPAU (the utility) requires its own AC disconnect ('Rule 27 Disconnect,' knife/blade type, lockable open, within 10 ft and within sight of the main service panel) plus, when a supply-side tap is used, a specific caution label reading 'CAUTION! SUPPLY SIDE TAP. OPEN AND LOCK AC PHOTOVOLTAIC DISCONNECT BEFORE REMOVING METER.' CPAU also sets electrical-equipment clearance requirements to the gas meter per its own Standard Detail SR-CN-0-1009. 90% · utility DG manual / handout
• Where must the labels be placed? Service-equipment locations; the AC and DC PV/ESS disconnects themselves; interactive points of interconnection; along DC conduits/raceways (every 10 ft, at turns, and above/below penetrations); within 3 ft of service equipment for rapid-shutdown-related labels; and at the CPAU Rule 27 AC disconnect (within 10 ft and within sight of the main service panel). 90% · authority's own handout

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 ft of, and within sight of, the main electrical service panel (CPAU 'Rule 27' knife/blade disconnect, lockable in the open position). 95% · utility DG manual
• Must equipment be on a specific approved list? No 80% · authority's own handout
• Are batteries permitted, and under what conditions? Yes, under specific conditions: ESS must be UL 9540 listed; individual units limited to 20 kWh, aggregate limited to 280 kWh per structure; permitted locations are detached garages/accessory structures, attached garages separated per CRC R302.6, outdoors 3+ ft from doors/windows into the dwelling, or enclosed utility closets/basements/storage with finished or 5/8" Type X gypsum-protected walls/ceilings; prohibited in sleeping rooms, closets opening to sleeping rooms, or other habitable spaces; minimum 3 ft spacing between individual units (reducible with an accepted large-scale fire test); heat/smoke detection required per CRC R327.7/CFC 1206.11.6. 95% · fire code + authority's own handout
• Is there a separate ESS permit or inspection? Yes 95% · authority's own handout + fee schedule
• Is a ground mount treated as a structure? Yes (functionally) 75% · authority's own handout (setback/BFE treatment)

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 (ACA) — plus a mobile app (iRequest) and phone 90% · authority's own FAQ

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 / Delegated (mixed) 90% · authority's own handout
• If delegated, to whom? Not delegated to an outside agency — building/electrical inspection is performed by the Palo Alto Building Division and, for ESS, fire-life-safety inspection is performed by the Palo Alto Fire Department. Both are City of Palo Alto departments. 85% · authority's own 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? PV: a single '703 – Photovoltaic/Final' inspection (plus '280 – Travel Time West of 280' scheduled alongside it for properties west of Highway 280) is required, with no separate rough-in stage described. ESS: '707 – Energy Storage System/Final' and '990 – Fire Inspection Final' are both required, scheduled at the same time. 85% · authority's own handout
• Is a rough-in or mid-roof inspection required? No 70% · authority's own handout (absence of a listed rough-in stage)

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 90% · published department handout
• What must be on site at inspection? Approved plans, the permit, and manufacturer installation instructions must all be available on site at the time of inspection; panels/equipment must be de-energized and open/ready for inspection (with tenant/owner notified beforehand); torque tools should be on site for the electrician to demonstrate proper torqueing on request. 95% · authority's own handout
• Does the inspector verify labels and listings? Yes 95% · authority's own handout / stated practice

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 90% · authority's own handout
• Who notifies the utility for PTO? Installer/Applicant 80% · utility's own rule/regulation
• Is there a re-inspection fee? $328 per primary inspection type, $164 per secondary inspection type, for Single-Family/Duplex re-inspections (up to 1 hour / 30 minutes respectively). Multi-Family/Commercial re-inspection is a flat $164 each. 95% · fee schedule
• How are corrections issued and cleared? Major changes (system size/scope, equipment change, relocation affecting wire/conduit size) must be submitted to the City for review and approval before inspection, generally as an Amendment/Revision filed in ACA (creating a new revision record, e.g. '18REV-xxxxx'); minor changes (e.g., moving equipment within the same general roof area) do not require resubmission. 75% · authority's own handout