Folsom, CA Accessory Structures: ADU Rules (2026)

105 governs ADUs citywide, aligning local rules with California Government Code Title 7, Division 1, Chapter 13. 010 allows ADUs on any parcel zoned for single-unit, two-unit, or multi-unit residential uses that has a proposed or existing primary dwelling, and limits JADUs to single-unit parcels. Every ADU or JADU needs a standard building permit under the city's normal fees and procedures; no separate zoning entitlement is required for most units. 090 defines "66323 units", a category including any JADU, any conversion of existing living space, and any new detached unit up to 800 square feet with 4-foot side and rear setbacks, that the community development director must approve ministerially with no discretionary review or public hearing.

200. 050 requires the city to notify an applicant within 15 business days whether an application is complete, and to approve or deny within 60 days of a complete submittal; if the city misses that deadline the application is deemed approved. 130 bars the city from requiring a new passageway or a separate utility line unless the utility provider demands one. 04, with a 60-business-day decision deadline, and that decision is final.