Temecula, CA Accessory Structures: Garage Conversions (2026)

Garage conversions are one of the most cost-effective ways to add living space, and California ADU law strongly facilitates them. Under Gov Code §65852.2, when a garage is converted to an ADU or JADU, the city cannot require replacement off-street parking even if minimum parking standards otherwise apply. A building permit is required for any conversion (and electrical/plumbing/mechanical permits as needed). The converted space must meet 2022 California Residential Code requirements including: minimum 7-foot ceiling height (kitchens/halls/baths can be 6'8"), Title 24 energy-efficiency upgrades (insulation in walls/ceiling/floor, dual-pane windows or limits, T24-compliant lighting and HVAC), egress windows in sleeping rooms (5.7 sq ft openable, sill ≤44 inches), smoke and CO alarms throughout, and a fire-rated separation if attached to the main dwelling and not converted to ADU status. Garage doors typically must be replaced with a structural wall and standard windows/doors. The new space generally counts toward floor area ratio and lot coverage limits but is not subject to additional setback requirements if built within the existing footprint. Conversions to non-ADU use (game room, office, gym) require permits but do not get the parking exemption — Temecula may require the property to maintain the original number of off-street spaces, often by adding tandem driveway parking. HOA approval typically required for exterior changes.