Sonoma County handles building permits for all unincorporated areas, while incorporated cities like Santa Rosa, Petaluma, and Healdsburg manage their own independent permit departments. The county enforces strict regulations for projects within the Coastal Zone, designated Wildland-Urban Interface (WUI) fire zones, and various flood-prone areas along the Russian River. Applicants must verify jurisdiction based on the specific parcel address before submitting plans.
The county enforces a stringent Tree Protection Ordinance that requires specific permits for the removal of protected native trees, particularly in designated scenic corridors.
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.
Source · Sonoma County Permit and Resource Management DepartmentLast verified · 05 / 2026