Independent Educational Guide: California residential solar permit facts, sourced, dated, and confidence-scored. Not legal, engineering, or permit advice.

San Mateo Solar Permit Guide

Pacific Gas and Electric Company (PG&E) territory · San Mateo County

San Mateo Solar Permit Checklist
Printed from mygridpermit.com/california/san-mateo/solar-permit-guide/ · Last verified 2026-08-03 · City of San Mateo Building Division / PG&E · Verify current requirements before relying on this checklist. Programs and fees change.
✓ Last verified 2026-08-0311 official sources
Informational only. This page is not legal, engineering, or permit advice. Every fact below links to the official source it came from and shows how confident we are in it. Verify current requirements with City of San Mateo Building Division and PG&E before making a decision.

Overview

GridPermit collects California residential solar and permitting facts directly from official sources (city, county, and state government sites, utilities, and public utilities commissions) and shows only what we can verify, with a confidence score and a link to where it came from. Nothing here is estimated or inferred beyond what's stated below. See our methodology for the rules this page follows.

Battery/solar incentive program on record

California SGIP - current category and budget check required

New applications and waitlist applications for ratepayer-funded SGIP budgets closed on December 30, 2025. New AB 209 applications have a June 30, 2028 deadline. The 2026 SGIP rate table publishes $3.10/W for solar and $1.10/Wh for storage in applicable Residential Solar and Storage Equity categories. Household eligibility and live budget availability vary by category and program administrator; check the official Program Metrics tracker before relying on an incentive.

Status on file: unknown. Verify current status before relying on this.

Confidence: High (0.9)

Source(s): SGIP - Statewide Announcements / About, 2026 Self-Generation Incentive Program Handbook, SGIP Program Metrics and Incentive Step Tracker

Permit fees

  • Solar Permit Processing Fee: amount not verified

    Municipal Code Section 23.46.050 states the processing fee amount is 'determined by City Council resolution' rather than fixed in the code text itself; the resolution/fee schedule document was not located/read this session, so no dollar figure is recorded.

Confidence: Medium (0.5)

Source(s): Chapter 23.46.050 Submittal Requirements | City of San Mateo Law Library

Rebates

Not yet verified.

Utility and generation supplier

Utility

Pacific Gas and Electric Company (PG&E)

Confidence: High (0.85)

Source(s): Peninsula Clean Energy Now Serving All of San Mateo County with Lower Cost, Cleaner Electricity

Generation supplier

WestLight Energy (formerly Peninsula Clean Energy) - ECOplus (default) (Community Choice Aggregator)

WestLight Energy's own announcement states it 'is a joint powers authority of the 20 cities in San Mateo County, and the county itself' serving 'all electric customers in San Mateo County' — the City of San Mateo is one of these 20 member cities. Default product: 'WestLight Energy customers are automatically enrolled in ECOplus, a 50% renewable energy supply that is cleaner and greener than PG&E.' The organization rebranded from Peninsula Clean Energy to WestLight Energy; the source URL itself redirected from peninsulacleanenergy.com to westlightenergy.org, confirming the rebrand.

Confidence: High (0.85)

Source(s): Peninsula Clean Energy Now Serving All of San Mateo County with Lower Cost, Cleaner Electricity

Interconnection

https://www.pge.com/en/about/doing-business-with-pge/interconnections/net-energy-metering-program.html

Same PG&E-wide Net Energy Metering program URL already verified for other PG&E-territory records this session — reused as a utility-level fact. pge.com returns HTTP 403 to automated fetch; confirmed to exist via search engine indexing under its expected title.

Confidence: Medium (0.6)

Permit authority

City of San Mateo Building Division

Confidence: High (0.9)

Source(s): SolarApp+ For Solar Installers | San Mateo, CA, Building

Permit page: https://www.cityofsanmateo.org/4770/SolarApp-For-Solar-Installers

Required documents

  • Completed permit application form (required when: always)
  • Completed eligibility checklist for expedited review (required when: always)
  • Completed standard electrical plan (available on the City's website) (required when: always)
  • Roof Plan (roof configuration, panel placement, fire-safety access points/pathways, system classification, label locations) (required when: always)
  • Completed structural criteria checklist (required when: always)

Confidence: High (0.9)

Source(s): Chapter 23.46.050 Submittal Requirements | City of San Mateo Law Library

Inspection steps

  • Building Official first verifies the submission is complete and code-compliant; a written correction notice is issued if deficiencies exist
  • Only one inspection is required and performed by the Building Division for eligible expedited-review systems
  • An inspection is scheduled within two business days of a request, with a two-hour inspection window
  • If the system fails the initial inspection, a subsequent inspection is authorized but need not follow the same scheduling requirements

Confidence: High (0.9)

Source(s): Chapter 23.46.070 Permit Review and Inspection Requirements | City of San Mateo Law Library

Eligibility constraints

  • Property types: single-family, duplex
  • Max system size (AC): 10 kW
  • Max system size (DC): Not yet verified.
  • Max thermal capacity: 30 kW
  • Program/pathway: Small Residential Rooftop Solar Energy Systems (San Mateo Municipal Code Ch. 23.46) / SolarAPP+ per SB 379
  • Other conditions:
    • Solar panel array may not exceed the maximum legal building height as defined by the City
    • System must conform to all applicable state fire, structural, electrical, and building codes and state/local health and safety standards

Confidence: High (0.9)

Source(s): Chapter 23.46.020 Definitions | City of San Mateo Law Library

Official contacts

Confidence: High (0.85)

Need a solar installer who handles permits in San Mateo?

EnergySage is an independent solar marketplace where you can request property-specific pricing from installers familiar with local permitting.

Compare quotes from solar installers →

You'll continue on EnergySage's website. GridPermit has a partner relationship with EnergySage; this link is not currently tracked, and whether the partnership results in compensation to GridPermit has not yet been confirmed.

Sources

Frequently Asked Questions

What utility serves solar customers in San Mateo, California?

Pacific Gas and Electric Company (PG&E) is the interconnection and distribution utility for San Mateo. The default electricity generation supplier is WestLight Energy (formerly Peninsula Clean Energy) - ECOplus (default), a Community Choice Aggregator (CCA), separate from Pacific Gas and Electric Company (PG&E).

What documents are required for a solar permit in San Mateo?

Commonly required documents include: Completed permit application form; Completed eligibility checklist for expedited review; Completed standard electrical plan (available on the City's website); Roof Plan (roof configuration, panel placement, fire-safety access points/pathways, system classification, label locations); Completed structural criteria checklist.

Who do I contact about solar permits in San Mateo?

City of San Mateo Building Division, phone (650) 522-7172, email Building.info@cityofsanmateo.org.

Disclaimers: This page is for informational purposes only and is not legal, engineering, financial, tax, or permit advice. GridPermit is not a solar installer, contractor, engineering firm, public utility, or government agency. Requirements, fees, and program terms change. Verify current requirements with City of San Mateo Building Division and PG&E before starting a project. Last verified 2026-08-03.

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