§ CA California
County permits
Contra Costa County
Contra Costa County issues permits only for unincorporated areas. Inside an incorporated city? Pick the city below — its building department handles your permit.
§ 01 Unincorporated
Unincorporated Contra Costa County.
If your property isn't inside an incorporated city, the county permit office handles your application directly.
- Permit authority
- Contra Costa County Department of Conservation and Development, Application and Permit Center / Building Inspection Division
- Website
- ePermits Center (Accela) ↗
- Online portal
- ePermits Center (Accela) ↗
- Phone
- 925-655-2700
- Address
- 30 Muir Road, Martinez, CA 94553
§ 02 Jurisdictions
Cities in Contra Costa County
Click any city for its full permit guide — authority, fees, application steps, inspections, and exempt work.
§ 03 County navigation
Information last verified for Contra Costa 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.