§ CA California
County permits
San Mateo County
San Mateo County issues permits only for unincorporated areas. Inside an incorporated city? Pick the city below — its building department handles your permit.
§ 01 Unincorporated
Unincorporated San Mateo County.
If your property isn't inside an incorporated city, the county permit office handles your application directly.
- Permit authority
- San Mateo County Planning and Building Department
- Online portal
- Accela Citizen Access (county permit system) ↗
- Phone
- Building Counter (650) 599-7310; Building Inspections (650) 599-7311
- Address
- 455 County Center, 2nd Floor, Redwood City, CA 94063
§ 02 Jurisdictions
Cities in San Mateo County
Click any city for its full permit guide — authority, fees, application steps, inspections, and exempt work.
§ 03 County navigation
Information last verified for San Mateo County, California. Permit rules and fees change frequently — verify current requirements with the issuing department before applying. Jaspector is an educational reference, not legal advice.