Rancho Cucamonga, CA Accessory Structures: Garage Conversions (2026)

100 govern converting an existing garage into livable space. 060(I)(4) addresses parking: when a required garage, carport, or covered parking structure for the main dwelling is converted or demolished in conjunction with the construction of an ADU, replacement of the eliminated parking is not required as long as the ADU remains in use as a legal ADU. That removes the biggest practical obstacle to garage conversions, since the homeowner does not have to rebuild covered parking elsewhere on the lot. 070(B) folds an attached garage into the definition of the house itself: a JADU must be contained entirely within the walls of the existing or proposed single-family dwelling, including attached garages or other enclosed uses, which the code treats as part of the dwelling; the section states JADUs are not allowed in accessory structures.

In practice that means a JADU can be built inside an attached garage, but not inside a detached garage, since a detached garage is an accessory structure rather than part of the dwelling's walls. 060(F) and (H).