Building Setbacks & Zoning in Napa County, CA (2026)
1 rule for unincorporated Napa County, California.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Napa County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Setback Rules
In unincorporated Napa County, no building, structure, well, utility facility, or other improvement may be erected within the established road setback area, which is measured from the road centerline and varies by road.
Napa County Road Setback Restriction
Some RestrictionsNapa County Code sec. 18.112.020
Except for official, directional or other signs permitted by state law and this code to be located within the road right-of-way of a state or county highway, no building, structure, well, utility facility or other improvement may be erected, constructed, enlarged, or established on, over or under the area within the established road setback.
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