Napa County, CA Fence Regulations: Height Limits (2026)

Fence regulation in unincorporated Napa County operates on two tracks. First, the building code track: California Building Code Section 105.2 (Item 2), adopted by Napa County under Title 15 (Buildings and Construction), exempts fences not over 7 feet in height from the building permit requirement (some earlier CBC editions used 6 feet; Napa applies whichever threshold is in the currently adopted code edition). Fences taller than the threshold require a building permit, structural design (especially for masonry or solid wood at height), and inspection. Second, the zoning track: Napa County Code Title 18 (Zoning), through the general regulations applicable to each district, sets the height limits and locations where fences may be placed without regard to whether a permit is required. Typical Napa County zoning standards for residential and rural-residential zones limit fences in the required front yard to 3 to 4 feet, allow up to 6 feet in side and rear yards, and require sight-distance triangles at street corners and driveways to preserve visibility for vehicles. In agricultural zones (AP, AW), agricultural fencing (typically barbed wire or page wire on T-posts for livestock and vineyard exclusion) is broadly permitted along property lines and within yards under the agricultural-use exception, but ornamental and security fencing follows the general standards. Deer fencing - common in Napa wine country to protect vineyards from deer browse - may be permitted at heights up to 8 feet under the agricultural exception when functionally part of agricultural operations. Sight-distance and corner-clearance rules apply at intersections under Napa County Public Works standards. California Civil Code Section 841 (Good Neighbor Fence Act) presumes that adjoining residential property owners share equally in the reasonable cost of constructing and maintaining a fence between their parcels; Civil Code Section 841.4 governs 'spite fences' (a malicious structure exceeding 10 feet in height built to annoy a neighbor). Cities within Napa County (Napa, St. Helena, Calistoga, Yountville, American Canyon) enforce their own fence height rules within their incorporated limits.