Garage conversion rules in Richmond, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Richmond permits conversion of an existing garage into an ADU as a ministerial process under RMC § 15.04.610.020 and California ADU Law. JADUs may be created within attached garages because state law treats them as part of the single-family residence. Demolished parking need not be replaced.
Garage conversions in Richmond are typically processed as ADU or JADU conversions under Richmond Municipal Code § 15.04.610.020 and California Government Code §§ 66313-66323. The Richmond ADU Info Sheet (effective January 1, 2025) confirms that ADUs 'may be converted from existing space within a primary residence or a detached structure,' which expressly includes garages. Per the City's Info Sheet: 'When a garage, carport, or covered parking structure is demolished or converted in conjunction with the construction of an accessory dwelling unit, the parking spaces need not be replaced.' For a converted (interior) ADU, the minimum floor area is 150 sq ft and maximum is 850 sq ft (studio/1bd) or 1,000 sq ft (2+ bd); setbacks are 'same as existing structure,' and 0 parking spaces are required. The California Department of Housing and Community Development's October 21, 2024 review of Richmond's ADU ordinance specifically requires the City to comply with Gov. Code § 66333(d), which states that 'enclosed uses within the residence, such as attached garages, are considered a part of the proposed or existing single-family residence,' meaning JADUs may be created within attached garages. The HCD letter required Richmond to amend ordinance language to clarify this. A conversion requires a building permit and ministerial planning review within 60 days (30 days with City pre-approved plans). Plans must comply with the California Building Code 2025 for habitable space (egress windows, smoke detectors, insulation, mechanical, electrical).
Unpermitted garage-to-living-space conversions are a code violation and create unsafe occupancy. Enforcement under RMC § 15.04.950 includes orders to vacate, fines, and required restoration or retroactive permitting. The City may also impose a lien on the property under RMC Chapters 1.04 and 2.62. Unpermitted conversions create resale and insurance problems.
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