5 county-level rules, plus city-specific rules for 8 cities in San Bernardino County, California.
Verified from official government sources
In unincorporated San Bernardino County, Development Code Chapter 84.01 and California ADU law (Gov. Code 66310 et seq.) allow at least one ADU on any single-family lot. Detached units may reach 1,200 sq ft and 18 ft tall; JADUs are capped at 500 sq ft. Side and rear setbacks are 4 feet.
Development Code Section 84.01.050(e) limits parcels of one acre or less to a single detached storage structure exceeding 120 sq ft, and that structure may not exceed 1,000 sq ft. Except in the Mountain Region, sheds cannot sit in front of the home where it faces a street right-of-way.
Converting a garage into an ADU is permitted ministerially under Development Code Chapter 84.01 and state ADU law. No setback is required for an existing garage converted to an ADU, and converted units do not require replacement parking. Roadway setbacks still apply in the Mountain Region.
Development Code Section 84.01.050(c) limits detached carports and garages to 1,200 square feet when located on parcels smaller than 20,000 square feet. Carports are accessory structures subject to the same setbacks as the primary structure and to the underlying zoning district's site-coverage limits.
Unincorporated San Bernardino County has no separate tiny-house ordinance. A permanent tiny home is treated as an ADU under Development Code Chapter 84.01, which expressly allows efficiency units and manufactured homes. Minimum unit size follows the California Residential Code; movable tiny homes on wheels are not approved as permanent dwellings.
8 cities in San Bernardino County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
5 verified rules • ADU Rules, Carport Rules
9 verified rules • ADU Impact Fees, ADU Owner Occupancy
5 verified rules • ADU Rules, Carport Rules
5 verified rules • ADU Rules, Carport Rules
5 verified rules • ADU Rules, Carport Rules
9 verified rules • ADU Impact Fees, ADU Owner Occupancy
9 verified rules • ADU Impact Fees, ADU Owner Occupancy
9 verified rules • ADU Impact Fees, ADU Owner Occupancy
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