City of Modesto

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% · fee schedule
• What does this authority permit itself, and what does it delegate? Both 90% · fee schedule + municipal code (retrieved via Municode CodesContent API, library.municode.com blocks plain fetch with 403/JS)
• Is a permit required for a residential rooftop PV system? Yes 95% · municipal ordinance
• Is there a separate electrical permit, or is it combined? Combined 70% · fee schedule
• Is a HOA or architectural approval required first? No 60% · municipal ordinance + statewide law inference
• Is there a historic-district review? No standalone historic-district review found for compliant systems 60% · municipal ordinance
• Is a wind or windstorm certification required? No 55% · published checklist
• Is a Specific Use Permit or Council approval ever required? Only if the Building Official makes a written finding, based on substantial evidence, that the system could have a 'specific, adverse impact' on public health/safety -- in which case a Use Permit is required, decisions on which are appealable to the Planning Commission. Not required for a standard code-compliant application. 90% · municipal ordinance
• Is there a system-size cap on residential generation? For the ministerial/expedited permitting path: no larger than 10 kW AC nameplate (or 30 kW thermal). Larger residential systems can still be permitted but fall outside the ministerial fast-track and go through standard review. Separately, at the utility level, MID caps net-metered systems at 115% of the customer's annual demonstrated load and at 3 MW AC CSI rating per site (with a capacity charge above 1 MW). 88% · municipal ordinance + utility handbook

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 65% · city-issued disclosure form (actual permit-file example)
• Must the contractor be registered with this authority before applying? Yes 85% · actual filed building permit application (PDF)
• Is a homeowner permitted to self-install and self-permit? Yes 78% · city-issued disclosure 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? Completed permit application (in eTRAKiT); Solar PV Standard Plan and supporting documentation; roof plan showing module/anchor layout; sheet showing location and verbiage of required labels; documentation of panel fire classification/rating; one-line diagram showing disconnects, AC/DC wiring sizes, panel size, hot-tap/line-side tap; plot plan (min. scale 1:10) with dimensioned Fire Dept. setbacks at ridge/valley/eave and a legend of all roof penetrations; support-component manufacturer worksheets/tables; electrical load calculations if <200A main or additional loads (pool, etc.) are present. 85% · published checklist (city form)
• How many copies, and in what format? Electronic submittal (email, internet portal, or fax) is expressly accepted, with electronic signatures accepted in lieu of wet signatures; applicants may alternatively submit in person at Building Safety. No specific paper-copy count is stated in the ordinance for the standard path; qualifying systems are additionally processed through the national SolarAPP+ platform (solarapp.nrel.gov) with the resulting approval number/documents uploaded into eTRAKiT. 70% · municipal ordinance
• Is a site plan required, and what must it show? Yes -- a site/plot plan is required, minimum scale 1:10, dimensioning required Fire Dept. setbacks at ridge, valley, and eave roof lines, with a legend denoting all roof penetrations (vent stacks, mechanical vents, B-vents, fireplaces, cupolas, dormers, etc.); MID separately requires a site diagram showing panel/inverter layout, metering, disconnects, placarding, obstructions, and gates. 88% · published checklist
• Is a one-line / three-line diagram required? Yes 90% · published checklist
• Are string and conductor calculations required? Yes 78% · actual SolarAPP+-format inspection checklist filed under a real Modesto permit
• Is a structural PE stamp required, and at what threshold? No PE stamp is required if the system meets the prescriptive criteria in the city's checklist (roof structurally sound, standard framing, anchor spacing per Table 1, module weight <=4 psf PV / 5 psf thermal, array <=50% of roof area). If any criterion is not met, the project is not eligible for the expedited/ministerial path and must go through standard (non-expedited) review, which can require engineered/stamped documentation -- but no single explicit PE-stamp dollar/size threshold is stated in the ordinance itself. 65% · 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? eTRAKiT (https://mode-trk.aspgov.com/eTRAKiT/), used together with the national SolarAPP+ platform (https://solarapp.nrel.gov) for qualifying residential PV: applicant obtains an instant SolarAPP+ approval, then submits the approval number and SolarAPP+ documents as a 'RES SOLAR / SOLAR APP' permit type in eTRAKiT. 90% · actual filed inspection checklist confirming live SolarAPP+ use
• Can the whole application be completed online? Yes, for SolarAPP+-eligible residential systems -- design review/approval happens instantly online at solarapp.nrel.gov, and the resulting approval package is then filed through the eTRAKiT online portal; the city's own instructions note counter staff will still contact the applicant for payment, so the payment step is not necessarily self-service online. 75% · portal + secondary confirmation (primary instructions PDF link is dead)
• What does a residential solar permit cost? $333 flat (residential Electrical Photovoltaic permit) 95% · fee schedule (PDF, current cycle)
• How is the fee calculated? Flat 92% · fee schedule
• Is there a separate plan-check fee? No separate PV-specific plan-check fee for the standard $333 expedited path -- MMC 9-1.1805(f) requires PV fees to comply with Gov. Code 65850.55/66015/66016 and H&SC 17951 (cost-of-service caps), and the flat fee appears to fold review in. General hourly 'Plan Review (Non-Structural) $233/hr' and 'Plan Review (Structural) $255/hr' line items exist in the same fee schedule and would apply only if a project needs review beyond the standard checklist (e.g. non-conforming roof requiring engineering). 65% · 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? 3 business days 95% · municipal ordinance
• How long is an issued permit valid before it expires? Expires if work not commenced within 12 months of permit date, or if suspended/abandoned for 180 consecutive calendar days, or if not completed within 730 calendar days of the permit date. 90% · municipal ordinance
• Which utility handles interconnection here? Modesto Irrigation District (MID) -- a municipally-owned irrigation/electric district, NOT Pacific Gas & Electric (PG&E) -- serves electric customers within the City of Modesto and is the interconnecting utility for residential solar here. 97% · utility's own program page
• Where does the utility sit in the sequence? Parallel with a gated final step: MID requires its own paperwork + engineering review and approval BEFORE construction begins (1-3 weeks each); the contractor then builds and gets the City/County permit inspected and passed; the signed city permit is then submitted to MID, which performs its own separate Interconnection Inspection (within ~12 working days) before installing the generation meter and issuing Permission to Operate (PTO). 90% · utility interconnection handbook (May 2026 revision, text-layer PDF)

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 (via the 2022 California Electrical Code, which is based on NFPA 70-2020) 75% · municipal ordinance (retrieved via Municode API)
• Which building code edition is in force? 2022 California Building Code and 2022 California Residential Code (Title 24, Parts 2 & 2.5), locally amended 75% · municipal ordinance (retrieved via Municode API)
• Which fire code edition is in force? 2025 California Fire Code (California Code of Regulations Title 24, Part 9), locally amended 92% · municipal ordinance (retrieved via Municode API)
• Are there local amendments to any of the above? Yes 92% · municipal ordinance (retrieved via Municode API)
• What is the installation judged against? The locally-amended 2022 California Electrical/Building/Residential Codes and the 2025 California Fire Code as adopted in MMC Title 9 (Chs. 1 & 3) and Title 3 (Ch. 1), plus (for the utility side of the system) MID's Electric Service Guide - Solar PV and Rule 21. 80% · municipal ordinance

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? Access pathways >=3 ft wide from eave to ridge on gable roofs; panels set back >=18in from a hip/valley if arrays sit on both sides of it; >=3 ft clearance between the ridge and panels for smoke ventilation; >=3 ft between multiple arrays. 88% · 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? Yes, per NEC 690.12 as adopted through the 2022 California Electrical Code (based on 2020 NFPA 70). 90% · actual filed inspection checklist

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 disconnect/point-of-interconnection labeling, a rapid-shutdown switch label, and a 'SOLAR PV SYSTEM EQUIPPED WITH RAPID SHUTDOWN' placard at the service equipment, per the NEC 690/705 marking rules implemented through the SolarAPP+ checklist the city uses. Separately and additionally, MID requires its own set of placards at its disconnects/meter (see Q42). 80% · SolarAPP+ inspection checklist used by the city
• Does the authority specify placard wording of its own? No 68% · municipal ordinance (absence, via Municode API search)
• Does the UTILITY specify placards beyond the AHJ's? Yes -- extensively. MID requires solar/ESS-specific placards beyond anything in the AHJ's own code: a 'Solar Array AC Disconnect Placard' (Figure 2), a 'Utility Use Only AC Disconnect Placard' (Figure 3), a 'Solar Production Placard' (Figure 4, noting 'All sources of power must be clearly placarded'), a 'Solar Breaker Placard' (Figure 5, 'DO NOT RELOCATE'), and a 'Battery Storage Placard' (Drawing PV-011.1) where an ESS is installed. 95% · utility DG/service manual (OCR'd, image-only text layer)
• Where must the labels be placed? MID placards go on the disconnect switches and the generation/production meter, all required to sit within about a 12 ft span and within line of sight of the customer's Main Service Panel (MSP), and on the same side of any gate/fence as the MSP. If MID grants an exception allowing the equipment to sit on the opposite side of a gate/fence from the MSP, an additional placard is required on the MSP itself stating the required MID solar equipment is located on the opposite side of the adjacent gate. Tags must be epoxy-adhered to a non-removable area of the panel (not screwed or riveted) and not removable without hand tools. 92% · utility DG/service manual (OCR'd)

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? Two visible, lockable, full-load-rated AC disconnect switches are required between the solar system and MID's grid. The first must sit between the main electric panel and the production meter socket. Both the AC disconnect adjacent to the main panel and the production meter socket must be installed within 12 feet of, and within line of sight of, the main electric panel, in a readily accessible location. 95% · utility DG/service manual (OCR'd, image-only text layer)
• Must equipment be on a specific approved list? Yes, in two layers. At the code-compliance level, MMC 9-1.1804(c) requires PV equipment to meet CEC/UL-listing and testing-lab standards. Separately and more specifically, MID requires solar modules/inverters used for its net-metering program to be run through the CSI-EPBB calculator (https://www.csi-epbb.com/), which draws on the California Energy Commission's list of 'Eligible Equipment' -- an oversized or non-eligible-equipment system 'will NOT be approved and will be mailed back to the contractor.' 82% · municipal ordinance + utility handbook
• Are batteries permitted, and under what conditions? Yes, with conditions. Batteries are excluded from the city's ministerial 10kW/expedited path (MMC 9-1.1802(b)(1) requires the system be 'without battery storage' to qualify), so a battery-equipped system must go through standard, non-expedited plan review. At the utility level, MID's Solar Handbook covers ESS interconnection (Drawings PV-012 through PV-016) and requires any ESS be configured for customer backup/peak-shaving only and never to export power onto MID's grid. 82% · municipal ordinance + utility handbook
• Is there a separate ESS permit or inspection? No 58% · utility handbook + municipal ordinance (absence)
• Is there a local rule on service upgrades or busbar sizing? No Modesto-specific numeric busbar/backfeed rule was found (base 2022 CEC 705.12 load-side/line-side rules govern, verified against the SolarAPP+-format inspection checklists used on real Modesto permits, which check busbar backfeed position against NEC criteria). At the utility level, MID requires any main-panel replacement ('rewire') tied to a solar interconnection to be separately reviewed by MID's Electric Engineering Department before work proceeds. 60% · municipal ordinance (absence) + utility handbook
• Is a specific mounting system or attachment spacing required? Yes -- maximum horizontal anchor spacing is prescribed by a table keyed to rafter/truss spacing and roof slope (e.g. 16in o.c. rafters -> 5'-4" max spacing on flat-to-6:12 slopes, tightening to 1'-4" to 2'-8" on steeper 7:12-24:12 slopes), and attachment points must be staggered. 88% · 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 / Email 82% · department page + utility handbook
• How much notice is required? 5 business days (city, expedited solar path) 82% · municipal ordinance
• Are same-day or AM/PM windows offered? Yes -- for the expedited solar path the city commits to a scheduling window of no more than 2 hours. 85% · municipal ordinance

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 ordinance
• If delegated, to whom? N/A -- not delegated. Note: MID performs a wholly separate, independent post-permit interconnection inspection of its own equipment (disconnects, generation meter, placarding) -- this is a parallel utility inspection, not a delegation of the city's AHJ inspection authority. 85% · municipal ordinance + utility handbook

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 qualifying expedited residential PV (<=10kW AC, no battery): a single, consolidated final inspection after installation is complete. Larger/non-expedited or battery-equipped systems follow the general building-permit inspection sequence in MMC Art. 8 (which can include rough/frame and final inspections) prior to the separate, subsequent MID interconnection inspection. 80% · municipal ordinance
• Is a rough-in or mid-roof inspection required? No, for the expedited path -- 'Only one (1) inspection shall be required.' 85% · municipal ordinance

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 88% · actual filed inspection checklists (multiple examples)
• What must be on site at inspection? Manufacturer installation instructions for all installed equipment must be available on site at the time of inspection; the solar contractor must be present for the (expedited) inspection. 82% · inspection checklist + municipal ordinance
• Does the inspector verify labels and listings? Yes 90% · actual filed inspection checklist

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 (city inspection sign-off/approval). Separately and subsequently, MID issues its own 'Permission to Operate' (PTO) letter by email, typically within about a week (stated max 10 working days) of MID's own passed interconnection inspection. 82% · municipal ordinance + utility handbook
• Who notifies the utility for PTO? Installer 90% · municipal ordinance + utility handbook
• Is there a re-inspection fee? City: $216.00 per hour (Reinspection Fee line item). MID (utility, separate interconnection inspection): $250 flat per failed inspection. 85% · fee schedule + utility handbook
• How are corrections issued and cleared? City: if an application is incomplete, the Building Official sends a written correction notice detailing all deficiencies (MMC 9-1.1806(f)); at inspection, reinspection may be requested if corrections are needed. MID: a failed interconnection inspection triggers an email to contractor/customer listing the issues; the contractor must resolve them, pay the $250 reinspection fee, and email pv@mid.org with payment confirmation to request reinspection. 85% · municipal ordinance + utility handbook