Lake Elsinore, CA Accessory Structures: Garage Conversions (2026)

The City's ADU chapter treats garage conversions as a favored path to new housing. Under § 17.415.110(D)(5), no setback is required for an existing, legally permitted garage that is converted to an accessory dwelling unit, but the ordinance draws a firm line at expansion: no addition may be built onto the converted garage that increases its encroachment into the setback, so the conversion must stay within the garage's existing footprint to keep the setback waiver. This pairs with the general setback rule in § 17.415.110(D)(4), which otherwise requires four feet from side and rear lot lines for new ADU construction; a garage conversion skips that requirement entirely because the structure already exists in place.

Parking gets the same accommodation. Section 17.415.110(F)(3) provides that when an ADU is created by converting or demolishing a garage, carport, or covered parking structure, the City does not require replacement of the parking spaces eliminated by the conversion, as long as the ADU remains in use as a legal accessory dwelling unit. Any parking that is provided must be paved or surfaced on a material approved by the Community Development Director, and parking on dirt or landscaped areas is expressly prohibited. A converted garage also qualifies for the ministerial, building-permit-only approval path under subsection (C), meaning the applicant does not need a separate entitlement application to convert an existing legally permitted garage into an ADU.