ADU rules in Sutter County, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Sutter County permits ADUs in all zones that allow residential uses. Attached ADUs are limited to 50% of the primary unit's floor area or 1,200 sq ft, whichever is less. Detached ADUs are typically capped at 850 sq ft (1,000 sq ft for 2+ bedrooms), expandable to 1,200 sq ft with a Conditional Use Permit.
Sutter County's ADU rules conform to California state law (Gov. Code 65852.2 and related statutes) and are codified in the Zoning Code (Title 1500). Attached ADUs must be no more than 50% of the existing primary dwelling's floor area or 1,200 square feet, whichever is less. Detached ADUs are permitted in any zone that allows residential uses, with a maximum size of 50% of the existing living area or 850 square feet (whichever is larger), or 1,000 square feet for ADUs with more than one bedroom. Detached ADUs may be increased to 1,200 square feet with a Conditional Use Permit. Side and rear setbacks for detached ADUs are 4 feet. Junior ADUs (JADUs) are also permitted up to 500 sq ft within the existing single-family dwelling per state law.
Unpermitted ADUs are abated through Code Enforcement and the building-permit process; California state law also provides amnesty pathways for previously unpermitted ADUs that meet current health and safety standards.
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See how Sutter County's adu rules rules stack up against other locations.
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