Garage conversion rules in Vallejo, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Vallejo allows conversion of an existing garage to an ADU or JADU under VMC Chapter 16.303 and California Government Code §65852.2. Replacement parking is not required when a garage, carport, or covered parking structure is physically replaced by an ADU.
Under VMC Chapter 16.303, replacement parking is not required when an existing garage, carport, or covered parking structure is physically replaced by an ADU, mirroring California Government Code §65852.2. The existing garage's footprint and setbacks are preserved for the conversion. A JADU created within an attached garage of the single-family dwelling is capped at 500 sq ft, must be within the walls of the primary home, and requires owner-occupancy of either the primary residence or the JADU by recorded deed restriction. All garage conversions require a building permit from Vallejo Building Services and must meet California Residential Code requirements for habitable space — egress, ceiling height, light and ventilation, smoke and CO alarms, and fire separation. ADU rentals must be for 30 days or longer.
Converting a garage to habitable space without a building permit violates Vallejo Building Code and VMC Chapter 16.303, subject to stop-work orders and enforcement by Code Enforcement. Renting the converted-garage ADU on a short-term basis violates the recorded deed restriction.
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