Mendocino County, CA Building Setbacks & Zoning: Setback Rules (2026)

Setback minimums in unincorporated Mendocino County run by zoning district. In the S-R Suburban Residential District, Sec. 035 sets minimum front and rear yards at 20 feet each, and Sec. 040 sets side yards at 6 feet each. The R-R Rural Residential District scales with lot size under Sec. 035 and Sec. 040: R-R:L-1 and R-R:L-2 parcels use the same 20-foot front/rear and 6-foot side yards as S-R, R-R:L-5 parcels step up to 30 feet on every side, and R-R:L-10 parcels require 50 feet front, rear and side.

The A-G Agricultural District requires 50 feet on every side under Sec. 035 and Sec. 040, reflecting its 40-acre minimum lot size. Sec. 015 layers additional exceptions on top of these district minimums. Eaves, canopies and similar roof features may project up to 2 feet into a required setback. A detached garage, shed or similar accessory building of 500 square feet or less and no taller than 15 feet at the ridge needs only a 4-foot setback from a rear line that has no street frontage; uncovered decks and porches get the same 4-foot allowance.

Barns, stables and chicken houses that house animals must sit at least 50 feet from any property line and 40 feet from any dwelling on parcels over 40,000 square feet, or on the rear third of the lot at least 4 feet from a side or rear line and 40 feet from a dwelling on smaller parcels. Nonconforming R-R:L-5 and R-R:L-10 parcels under five acres fall back to a 20-foot setback on every side under Sec. 045.