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California / Local permit guide

San Mateo Solar Permit Guide

Your local requirements. The official sources. A clearer next step.

Permit authority
City of San Mateo Building DivisionSource linked
Electric utility
Pacific Gas and Electric Company (PG&E)Source linked
See your permit path

San Mateo County · Explore related utility guides

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.
Source healthLast verified 2026-08-0311 official sources5 of 6 core facts verified
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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.

Research coverage

Your permit path,
at a glance.

This shows what GridPermit has verified for San Mateo. It does not show the status of a specific project.

  1. 01Permit authorityCity of San Mateo Building DivisionAuthority sourced
  2. 02DocumentsChecklist includes conditional itemsConditions apply
  3. 03InspectionInspection guidance for San MateoSteps sourced
  4. 04Utility & PTOPacific Gas and Electric Company (PG&E)Utility path sourced

01 / Know your path

Two approvals.
One project.

Local authority

Permit & inspection

City of San Mateo Building Division

Local requirements
Electric utility

Interconnection & PTO

Pacific Gas and Electric Company (PG&E)

Utility requirements

A local permit and utility permission to operate are different approvals. Check the local sequence and requirements below.

How to read this guide

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.

Sources & confidence

Confidence: High (0.9)

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

02 / Prepare your application

What you need.

0 of 5 markedSaved only on this device; not confirmation of permit readiness.

Sources & confidence

Confidence: High (0.9)

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

Permit fees

Confidence reflects a verified fact about how the fee is set (by Council resolution), not a verified dollar amount — no amount is invented.

  • Solar Permit Processing Fee: amount not verified

    Some supporting official material could not be independently confirmed from the full source in GridPermit's latest review. Verify the current requirement with the authority before relying on it.

Sources & confidence

Confidence: Medium (0.5)

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

Rebates on record

Rebates on record

Not yet verified.

Utility and generation supplier

Utility

Pacific Gas and Electric Company (PG&E)

WestLight Energy's own announcement confirms PG&E's continued role: 'WestLight Energy customers see a new line item on their PG&E bill for WestLight Energy's service, along with a corresponding generation credit from PG&E for the energy supply PG&E previously provided.' PG&E is the underlying transmission/distribution/billing utility; WestLight Energy is a separate default generation supplier — see generation_supplier.

Sources & confidence

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.

Sources & confidence

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

Some supporting official material could not be independently confirmed from the full source in GridPermit's latest review. Verify the current requirement with the authority before relying on it.

Confidence: Medium (0.6)

Permit authority

City of San Mateo Building Division

Sources & confidence

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

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
Sources & confidence

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
Sources & confidence

Confidence: High (0.9)

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

Official contacts

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 links to EnergySage as an independent third-party resource. This link is not currently tracked for compensation.

Official sources

Official 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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