County Building Permits

Napa County Building Permit Guide

Building permit information for unincorporated Napa County and all incorporated cities and towns. Find your jurisdiction's permit authority, application process, fees, and requirements.

California Updated March 2026

Important: Napa County issues building permits only for properties in unincorporated areas of the county. If your property is inside an incorporated city or town, select your jurisdiction below because that local building department handles your permits, not the county.

Unincorporated Napa County

Permit authority
Planning, Building & Environmental Services, Building Division
Getting started
Online Permit Center guide
Forms and checklists
Building forms and checklists
Governing body
Napa County Board of Supervisors

Cities in Napa County

Select your city or town for local permit authority, portal links, application steps, fees, and inspection requirements.

American Canyon Permit guide → Calistoga Permit guide → Napa Permit guide → St. Helena Permit guide → Yountville Permit guide →

Information on this page was last verified: March 2026. Permit rules and fees change - confirm current requirements directly with the relevant city, town, or county department before applying.

Related California Resources

License Requirements Verify your contractor's CSLB license → Contract Template Free homeowner-contractor agreement →

Need help with your project?

Navigating permits in Napa County can be complicated.

Jaspector connects you with local experts who can review your scope, verify your contractor, and help you understand what permits your project actually needs.

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authorities listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.