ADU rules in Contra Costa County, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Unincorporated Contra Costa County allows one accessory dwelling unit (ADU) on lots of at least 6,000 sq ft in single-family, multi-family, P-1, and agricultural districts under Chapter 82-24 of the County Ordinance Code.
Per Contra Costa County Ordinance Code Chapter 82-24 (Accessory Dwelling Units), one ADU may be located on any lot in the R-6, R-7, R-10, R-12, R-15, R-20, R-40, R-65, or R-100 single-family residential districts, the P-1 planned unit district for residential uses, the M-6, M-9, M-12, M-17, or M-29 multi-family residential districts, or the A-2, A-3, A-4, A-20, A-40, or A-80 agricultural districts. The minimum lot size for a property with a primary residence plus an ADU is 6,000 sq ft countywide (10,000 sq ft in the Kensington -K combining district). Detached ADUs may be up to 1,000 sq ft in R-districts on lots under 12,000 sq ft, or up to 1,200 sq ft in agricultural districts and on R-district lots of 12,000 sq ft or larger. Maximum height is 35 feet countywide (14 feet in Kensington). A permanent foundation is required, and the exterior must be architecturally compatible with the primary dwelling. Per § 82-24.008, ADUs are not allowed to be permitted for Short Term Rental Use.
Building or occupying an unpermitted ADU is a zoning violation enforced by the Department of Conservation and Development. Code enforcement can issue notices to comply, abatement orders, and administrative fines under Title 1 of the County Ordinance Code, and unpermitted structures may be required to be removed or brought into compliance.
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Contra Costa County, CA
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