San Bernardino, CA Accessory Structures: Garage Conversions (2026)

Garage conversions in San Bernardino are generally pursued as Accessory Dwelling Units because state law is far more permissive for ADUs than for standard remodels. Under California Government Code 65852.2, as amended by AB 68 and AB 881, a city must ministerially approve the conversion of an existing attached or detached garage into an ADU and cannot require replacement of the displaced parking spaces. The converted space must meet basic habitability standards, including ceiling height (minimum 7 feet in most rooms under CRC), emergency egress windows in bedrooms, smoke and CO alarms, bathroom ventilation, insulation, and Title 24 energy compliance. If the garage is simply converted to additional living area attached to the primary dwelling (a bonus room or master suite expansion rather than an ADU), the San Bernardino Development Code typically requires the property to still satisfy its original parking requirement, usually two covered spaces for single-family homes. Replacement parking can be provided as a new carport or driveway parking pad that meets zoning dimensions. Conversions require building, electrical, plumbing, mechanical, and (when adding a kitchen or bath) plumbing permits, and inspections. If the original garage was built without permits, legalization of the existing structure may be required first. In VHFHSZ foothill areas, conversions of detached garages may trigger Chapter 7A ignition-resistant upgrades.