Santa Barbara County, CA Accessory Structures: Garage Conversions (2026)

A common way to add an ADU in the unincorporated County is converting an existing garage or other permitted accessory space into a dwelling unit. California's ADU statutes (Government Code 66310 et seq., the successor to former 65852.2) require ministerial approval of conversions of existing space and generally prohibit requiring replacement parking when a garage is converted. County and planning summaries for Santa Barbara County indicate that setback requirements are effectively waived when converting an existing permitted structure, and no replacement parking is needed for a garage conversion. The work still requires building permits to confirm the converted space meets health, safety, and California Building Code standards (egress, light, ventilation, fire separation, sanitation). A garage that is simply converted to additional living area for the main home (not a separate ADU) is reviewed as a building-permit remodel under zoning for the main dwelling. In the Coastal Zone, a conversion may also require review or a Coastal Development Permit under the certified Local Coastal Program. Because details change, confirm the current conversion standards and permit path with Santa Barbara County Planning & Development before starting.