City of Isleton

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 90% · department page
• What does this authority permit itself, and what does it delegate? Both 85% · department handout
• Is a permit required for a residential rooftop PV system? Yes 95% · department handout
• Is there a separate electrical permit, or is it combined? Combined 82% · department handout
• Is there a historic-district review? Yes, conditionally, for parcels within the codified historic district. 65% · municipal code
• Is there a system-size cap on residential generation? No hard citywide size cap on residential solar; 15kW is only the fee-schedule's flat-rate/per-kW breakpoint (tracking the AB 1414 state fee-cap statute quoted on the same fee-schedule page), not a permitting limit on system size. 75% · 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 90% · department handout
• Must the contractor be registered with this authority before applying? Yes 70% · permit application form
• Is a homeowner permitted to self-install and self-permit? Yes 92% · department handout

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? Three (3) sets of plans containing: a plan/plot view showing PV location and roof framing (or site plan if not roof-mounted); mounting/roof-covering/weatherproofing details; an electrical single-line diagram with total kVA rating; point of utility interconnection with main breaker/PV breaker/busbar rating; conduit and conductor type/size; manufacturer cut-sheets for modules, mounting system, combiner boxes, inverters and disconnects; and structural calculations by a CA-registered design professional if system weight exceeds 5 lb/sq ft. 92% · published checklist
• How many copies, and in what format? 3 sets of plans for a solar-only submittal (per the PV Requirements handout); the general 'New Single Family Residential' checklist separately calls for 3 sets for full residential building submittals, drawn 18"x24" minimum to 30"x42" maximum, wet-signed by the preparer. 85% · published checklist
• Is a site plan required, and what must it show? Yes — a plan view/plot plan showing the location of the PV installation and the layout of existing roof-framing members supporting the system, or a site plan if the panels are not roof-mounted. 92% · published checklist
• Is a one-line / three-line diagram required? Yes 95% · published checklist
• Are string and conductor calculations required? Partially — the checklist requires 'type and size of all conduit and conductors throughout the PV system' and total kVA/breaker/bussing ratings, but does not explicitly name string voltage/Voc-temperature-correction calculations by name. 65% · published checklist
• Is a structural PE stamp required, and at what threshold? Yes — structural calculations by a California-registered design professional are required if the total weight of the PV system exceeds 5 pounds per square foot. 92% · 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? iworq Citizen Portal — isleton.portal.iworq.net/portalhome/isleton ('Online Building Services / Online Building Application, Status Drawings And Applicable Documents'), linked directly from the city's own Building Division page. 85% · department page
• Can the whole application be completed online? No 60% · published checklist
• What does a residential solar permit cost? Residential roof-mount PV ≤15kW: $370 flat (includes plan review, excludes electrical equipment). Residential roof-mount PV >15kW: $500 + $15/kW above 15kW. Residential ground-mount PV ≤15kW: $370 flat for panels/equipment only (piers/foundation billed separately on valuation). Residential ground-mount PV >15kW: $500 + $15/kW above 15kW (same foundation carve-out). A $45 Permit Issuance Fee, a 6% Technology Surcharge (of the building permit fee), and small state CBSC/SMIP surcharges apply on top per the schedule's general Miscellaneous Administration Fee section. 92% · published fee schedule
• How is the fee calculated? Tiered 90% · published fee schedule
• Is there a separate plan-check fee? No 85% · 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? Roughly two to three weeks for the first plan-review pass on a standard (non-over-the-counter) submittal. 55% · department handout
• How long is an issued permit valid before it expires? 180 days from issuance, automatically extended to 180 days from each passed inspection, up to a maximum of 2 years total (or completion/CofO, whichever first). 90% · department handout
• Which utility handles interconnection here? Pacific Gas & Electric (PG&E) 80% · department handout (utility named in sample placard)

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? 2017 80% · municipal code (code-adoption chapter)
• Which building code edition is in force? 2019 California Building Code (based on the 2018 IBC) 85% · municipal code (code-adoption chapter)
• Which fire code edition is in force? 2019 California Fire Code 65% · published checklist
• Are there local amendments to any of the above? No local technical amendments found to the building/electrical/fire code itself. 60% · municipal code
• What is the installation judged against? The 2019 CBC/CRC/CEC/CMC/CPC/CEnC as adopted, plus manufacturer listing/installation instructions per CEC 110.3(B), and CEC Article 690 for the PV-specific work. 88% · department 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? Modules no higher than 3 ft below the ridge; single-ridge (gable) roofs need two 3-ft-wide access pathways from eave to ridge on each module-bearing slope; hip-roof layouts need one 3-ft-wide pathway from eave to ridge, sited at a structurally strong location; modules must be at least 1.5 ft clear of any hip or valley. 90% · department handout

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 — required per California Electrical Code Section 690.12 (2019 CEC / 2017 NEC). 88% · department 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? Main-service 'CAUTION! SOLAR ELECTRIC SYSTEM CONNECTED' marking; 'CAUTION! SOLAR CIRCUIT' marking on all interior/exterior DC conduit, raceways, enclosures and junction boxes (every 10 ft, at turns, and above/below penetrations); a labelled AC disconnect placard; a DC disconnect placard (CEC 690.53) with rated max power-point current/voltage, max system voltage, short-circuit current, and controller max rated output current; an ungrounded-system shock-hazard warning at each junction/combiner/disconnect (CEC 690.35(F)); a point-of-interconnection marking (CEC 690.54/690.64(B)(4)); an inverter-output 'DO NOT RELOCATE' warning (CEC 690.64(B)(7)); and, for stand-alone/hybrid systems, a permanent disconnect-location plaque or directory (CEC 690.56(A)/(B)). 92% · department handout
• Does the authority specify placard wording of its own? Yes 92% · department handout
• Does it specify letter height, colour or material? Red background, white lettering, minimum 3/8" letter height, all capital letters, Arial or similar font, weather-resistant material (UL 969 marking/labeling system recommended as the standard to determine weather rating). 92% · department handout
• Is a site plan / facility map placard required, and what must it show? Buildings/structures with both utility service and a PV system must have a permanent plaque or directory giving the location of the service disconnect and the PV disconnect if they are not co-located (CEC 690.56(B)); a stand-alone (non-grid-tied) system requires its own exterior plaque/directory identifying disconnect location and that the structure has a stand-alone power system (CEC 690.56(A)). 75% · department handout
• Where must the labels be placed? Main service disconnect marking placed within/on the disconnect cover (interior if the panel is operable with the door closed, otherwise on the outside cover); DC circuit markings on interior and exterior DC conduit/raceways/enclosures/junction boxes every 10 ft, at turns, and above/below penetrations; AC and DC disconnect placards mounted on or adjacent to the respective disconnecting means; point-of-interconnection marking at the accessible location of the interconnection disconnect. 88% · department 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.

• Must equipment be on a specific approved list? Yes 85% · department handout
• Are batteries permitted, and under what conditions? The only battery/ESS-specific provision found is a marking rule: 'Photovoltaic power systems employing energy storage shall also be marked with the maximum operating voltage, including any equalization voltage and the polarity of the grounded circuit conductor (CEC 690.55).' No dedicated ESS ordinance, size limit, or location/clearance rule was found in either the Municipal Code (no 'battery' or 'energy storage' heading anywhere in the full code) or any Building Division handout. 65% · department handout
• Is there a separate ESS permit or inspection? No separate ESS/battery-storage permit fee line exists in the Building Division fee schedule. 75% · published fee schedule
• Is a ground mount treated as a structure? Yes, for the foundation/pier component 78% · published fee schedule
• Is a specific mounting system or attachment spacing required? No city-mandated proprietary mounting system; the plan set must document the manufacturer-specific mounting method (roof-covering type/count, weatherproofing, and 'style, diameter, length of embedment of bolts or other approved fastener'). 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? Phone 85% · department handout
• How much notice is required? Two conflicting figures in the city's own documents: the PV-specific handout says inspections 'must be scheduled 24 hours in advance', while the general Building Division department page separately says 'call...at least a week before you need an inspection' and notes 'INSPECTIONS DONE WEDNESDAY(S) ONLY'. 55% · department handout vs. department page (conflicting)

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 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? A rough inspection (only if PV-related work is inside walls/ceilings to be covered by finish materials), followed by a final inspection performed by the Building Division after all work is complete. 85% · department handout
• Is a rough-in or mid-roof inspection required? Conditional — a rough inspection is required only if PV-related wiring/work will be concealed inside walls or ceilings; otherwise only the final inspection applies. No dedicated 'mid-roof' inspection stage is named for PV. 80% · 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, in substance — the 2019 Photovoltaic (PV) Submittal Requirements PDF itself functions as a combined submittal-and-inspection guide, with a dedicated 'Inspection Procedures' section, though it is not formatted as a separate stand-alone checklist document. 60% · department handout
• What must be on site at inspection? The Permit Card and the Approved Job Copy of the Drawings must be presented to the inspector at each inspection. The contractor or owner must provide roof access (an OSHA-approved ladder, minimum Type I, 250 lb rating, in good condition and designed for its intended use) for all required inspections. 90% · department handout

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? $155.00 92% · published fee schedule
• How are corrections issued and cleared? Not solar-specific: general practice per the Inspection Brochure is that a re-inspection fee applies 'if an inspection call is made but the work is not ready for inspection, or required corrections have not been completed', or if the approved plans/correction notice are not available on site or the inspector cannot access the site. 55% · department handout