Garage conversion rules in Chino, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
California Gov. Code §65852.2 (now re-codified by SB 477 at Gov. Code §66310 et seq.) preempts local bans on converting an existing garage into an Accessory Dwelling Unit. Chino adopted a conforming ADU ordinance on March 17, 2020 (Chino Municipal Code Title 20). Garage-to-ADU conversions are permitted ministerially, replacement parking is NOT required when a garage is converted to an ADU, and approval must be issued within 60 days of a complete application.
State law preempts local restrictions: under California Gov. Code §65852.2(a)(1)(D)(xi) (re-codified by SB 477 of 2024 at Gov. Code §66314), when a garage, carport, or covered parking structure is converted to or replaced with an ADU, replacement off-street parking is NOT required. Chino adopted a conforming Accessory Dwelling Unit ordinance on March 17, 2020 under Chino Municipal Code Title 20 (Zoning), updated to match successive state amendments. A converted garage ADU must meet California Residential Code minimum habitable-space standards (CRC R304 — minimum 70 sq ft, 7-ft ceiling), provide an independent exterior entrance, a kitchen with sink and cooking facility, and a bathroom with toilet, sink, and bath/shower. Setback requirement for a conversion within the existing garage footprint is the existing setback (no new setback triggered); a same-footprint expansion may also use the 4-ft side/rear setback floor. Owner occupancy of the primary dwelling is not required for ADUs permitted between January 1, 2020 and January 1, 2025 (Gov. Code §65852.2(a)(6) as amended). Approval is ministerial; the local agency must approve or deny within 60 days of a complete application.
Operating an unpermitted garage-conversion living unit is a zoning and building code violation. Code enforcement can require either permit cure (file plans, pay fees, meet CRC habitability/egress) or removal of habitable improvements. Renting an unpermitted garage as a dwelling can additionally trigger Health & Safety Code substandard-housing actions.
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