Napa County, CA Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- Prohibits
- Improvements in road setback
- Measured from
- Road centerline
- Distance
- Varies by road (e.g., 40 ft Oakville)
- Code section
- NCC 18.112.020
Summary
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.
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.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 48 | General Policies and Bylaws: ? | Fees and Archived Fees: ?).
Full Breakdown
Napa County Code section 18.112.020 provides that, except for certain permitted signs, 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. Section 18.112.030 states the setbacks are measured from the road centerline, and later sections set specific distances for particular roads and communities (for example, a 40-foot setback from centerline within Oakville).
Violations & Fines
Erecting a building or improvement within an established road setback violates Napa County Code section 18.112.020 and is enforced by the county.
Frequently Asked Questions
Can I build near the road on my Napa County parcel?
How is the setback measured?
Sources & Official References
Other rules in Napa County
California rules heatmap·Compare Napa County to another location·View the California building setbacks & zoning overview
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