Garage conversion rules in Fullerton, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Fullerton permits garage conversions to ADUs under FMC Section 15.17.100. Conversions of legally established garages are exempt from setback requirements. No replacement parking is required for the primary dwelling when converting a garage.
Under FMC Section 15.17.100 and state ADU law, converting an existing garage to an accessory dwelling unit is permitted on residential lots. Conversions of legally established structures are exempt from standard setback requirements, meaning the ADU can occupy the same footprint as the former garage. No replacement off-street parking is required for the primary dwelling. Building permits are required to ensure the converted space meets California Building Code habitability standards including insulation, ventilation, electrical, plumbing, and fire safety. Junior ADUs may also be created within a garage as part of the primary dwelling, limited to 500 square feet with an efficiency kitchen. All garage conversions must be inspected by the Building Division.
Converting a garage without permits violates the building code. Unpermitted conversions may be ordered restored, fined, and create complications with property sales and insurance.
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Side-by-side rule comparisons with other cities in Orange County.
See how other cities in Orange County handle garage conversions.
See how Fullerton's garage conversions rules stack up against other locations.
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