ADU rules in Folsom, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Folsom must allow ADUs on all residential lots under CA Gov Code §65852.2. Ministerial approval within 60 days for ADUs up to 800 sq ft with 4-foot setbacks, no owner-occupancy requirement, and no parking within 1/2 mile of transit. Folsom has adopted an ADU ordinance with local standards that cannot fall below state minimums.
California has heavily preempted local ADU regulation through Gov Code §65852.2 and related statutes (AB 68, AB 881, SB 13, AB 1033). Folsom must ministerially approve an ADU permit within 60 days of a complete application. Core state minimums the city cannot restrict below: (1) detached ADU up to 800 sq ft or 16 feet tall must be approved regardless of lot coverage/FAR limits, (2) 4-foot rear and side setbacks, (3) no replacement parking required for converted garages near transit, (4) no parking required for any ADU within 1/2 mile of a transit stop, (5) no owner-occupancy requirement (SB 13 through 2025), (6) no impact fees on ADUs under 750 sq ft, (7) JADUs up to 500 sq ft within existing single-family dwelling allowed. Folsom may impose additional standards on larger ADUs (up to 1,200 sq ft typical limit) such as architectural compatibility and matching materials. AB 1033 (2024) allows Folsom to adopt an ordinance permitting ADU condo-ization (selling ADU separately from main dwelling) but is not mandatory. Historic District homes may have additional design review for exterior compatibility but cannot be denied an ADU outright.
Permit denial inconsistent with state law: owner can appeal to HCD or seek court review with attorney fees. Unpermitted ADU construction: stop work order + bring to code. Illegal STR use of ADU: see STR ordinance (separate).
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Side-by-side rule comparisons with other cities in Sacramento County.
See how other cities in Sacramento County handle adu rules.
See how Folsom's adu rules rules stack up against other locations.
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