The county handles building permits for all unincorporated areas, while incorporated cities like Woodland, Davis, West Sacramento, and Winters maintain their own independent building and planning departments. Projects in unincorporated areas must comply with specific county zoning ordinances, and properties located within the Yolo Bypass or designated flood zones require additional hydraulic review and elevation certifications.
How this fits with the state
The state authority here is California Contractors State License Board. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.