San Mateo County, CA Solar Energy: Panel Permits (2026)
Key Facts
- Permit Fee Cap
- $450 residential
- System Size
- Under 10 kW expedited
- Fire Setback
- 3 ft ridge, 18 in sides
- State Law
- AB 2188 / Civil Code §714
- Utility
- PG&E NEM 3.0
Summary
Unincorporated San Mateo County uses expedited solar permitting under California AB 2188 (Solar Rights Act). Residential rooftop systems under 10 kW qualify for same-day online permits through SolarAPP+ or the County Building Division. Fire setbacks per CFC Chapter 11B.
(b) A city or county shall administratively approve applications to install solar energy systems through the issuance of a building permit or similar nondiscretionary permit. Review of the application to install a solar energy system shall be limited to the building official’s review of whether it meets all health and safety requirements of local, state, and federal law. The requirements of local law shall be limited to those standards and regulations necessary to ensure that the solar energy system will not have a specific, adverse impact upon the public health or safety. However, if the building official of the city or county makes a finding, based on substantial evidence, that the solar energy system could have a specific, adverse impact upon the public health and safety, the city or county may require the applicant to apply for a use permit.
(c) A city, county, or city and county may not deny an application for a use permit to install a solar energy system unless it makes written findings based upon substantial evidence in the record that the proposed installation would have a specific, adverse impact upon the public health or safety, and there is no feasible method to satisfactorily mitigate or avoid the specific, adverse impact.
Full Breakdown
San Mateo County complies with California's Solar Rights Act (Civil Code §714) and AB 2188 requiring expedited, streamlined permitting for residential solar installations. Systems 10 kW or smaller on one- and two-family dwellings qualify for administrative/over-the-counter approval with limited review. The County participates in the SolarAPP+ automated permitting platform. Permit fees are capped at $450 for residential per AB 2188. Required submittals: site plan, electrical line diagram, structural details, and utility interconnection info. Fire Code (CFC §1204 and California Residential Code R324) requires 3-foot ridge setback and 18-inch side setback on hip roofs, with clear pathways for firefighter access. PG&E interconnection required; NEM 3.0 (net billing tariff) applies to new systems connected after April 15, 2023. Battery storage systems require separate electrical permit. Coastal zone installations may need Coastal Development Permit if not exempt.
Violations & Fines
Installation without permit: stop-work order, retroactive permit plus 2x fee penalty per SMC. Fire setback violations: correction required before final inspection. PG&E disconnect for uncertified systems. Coastal zone unpermitted work: CCC enforcement possible.
Frequently Asked Questions
What are typical penalties for violating panel permits rules?
Sources & Official References
Other rules in San Mateo County
California rules heatmap·Compare San Mateo County to another location·View the California solar energy overview
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