Garage conversion rules in Tustin, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Tustin allows garages to be converted into living space, most commonly as an ADU or JADU under City Code Section 9279. Single-family homes must keep two enclosed garage spaces (Section 9263), so converting a garage usually requires replacement covered parking unless the unit qualifies for a state ADU parking exemption.
Garage conversions in Tustin are handled mainly through the ADU/JADU rules in Tustin City Code Section 9279 (Ordinance No. 1517) and the off-street parking standards in Section 9263. A converted ADU is one created within all or part of the existing permitted interior space of a structure, which can include an attached garage; a JADU of up to 500 square feet may also be built within an attached garage that is part of the single-family residence. Tustin's parking code (Section 9263(g)) requires single-family dwellings to provide two spaces within a fully enclosed garage for homes with four or fewer bedrooms, and three for five or more, so a straightforward garage conversion can eliminate required parking. Under state ADU law, however, a city cannot require replacement parking when a garage is converted to an ADU, and ADU parking is waived within one-half mile of transit, so a conversion to a permitted ADU may proceed without rebuilding the covered spaces. Converting a garage simply to extra living area (not an ADU) still must satisfy the underlying parking requirement and may require providing alternative covered parking. In Old Town's Cultural Resources District, exterior changes from a garage conversion, such as replacing a garage door with a wall and window, require Design Review and a Certificate of Appropriateness. Confirm requirements with Tustin Community Development at (714) 573-3140.
Converting a garage without permits, losing required covered parking on a non-ADU conversion, or altering a garage facade in the Cultural Resources District without a Certificate of Appropriateness can result in code-enforcement citations, permit requirements, and orders to restore parking or reverse unpermitted work.
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