Historic Preservation in Sonoma County, CA (2026)
1 county-level rule, plus city-specific rules for 2 cities in Sonoma County, California.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Sonoma County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Historic-Cultural Monuments
Unincorporated Sonoma County designates individual historic structures and historic districts under the HD Combining District, and any exterior alteration, demolition, or new building inside a designated historic district needs county landmarks commission approval before a zoning permit can issue.
Sonoma County Historic Landmarks and District Review
Significant RestrictionsSonoma County Code § 26-68-020
No zoning permit authorizing alterations (including demolition) in the exterior of a structure within the boundaries of a historic district and no zoning permits authorizing construction of a new building within the boundaries of a historic district shall be granted unless approval has been granted by the county landmarks commission. Minor alterations may be reviewed and approved by staff in co...
Historic Preservation by City in Sonoma County
2 cities in Sonoma County have their own historic preservation rules. Each link goes to that city's dedicated page with code citations.
All Sonoma County ordinances
See every category we cover for Sonoma County: parking, noise, fences, fires, animals, pools, and more.
Sonoma County Ordinance Hub →