Hesperia, CA Accessory Structures: Garage Conversions (2026)

Under Hesperia Code §16.12.360(E)(9), no setback is required for an existing garage that is converted to an accessory dwelling unit, and a setback of no more than four feet from side and rear lot lines applies to ADUs constructed above a garage. Per §16.12.360(E)(10), when a garage, carport, or covered parking structure is demolished in conjunction with construction of an ADU or converted to an ADU, those off-street parking spaces do not need to be replaced. Converting a garage to non-ADU habitable space (a den, family room, or extra bedroom that is not an independent dwelling) still requires a building permit, compliance with Title 24 Energy Code, and replacement parking under the underlying Hesperia parking standards because the state ADU parking waiver only applies when the conversion creates an ADU. The city processes ADU permits ministerially within 120 days under §16.12.360(C). Converting a garage that was a required covered parking space without creating an ADU may require a covered carport or new garage elsewhere on the lot to satisfy the original residential parking standard.