Madera County, CA Accessory Structures: Garage Conversions (2026)

There is no standalone garage-conversion ordinance in the Madera County Zoning Code (Title 18). A conversion is reviewed under the building code (Title 14) for habitability, egress, and electrical and mechanical compliance, and under the zoning code for the resulting use and any parking impacts. If the garage is converted into an accessory dwelling unit, the county's ADU section 18.04.153 applies, requiring the unit to have its own kitchen, bathroom, and separate entrance and to meet the underlying zone's setbacks and height. More importantly, California's statewide ADU law at Government Code 66310-66342 specifically protects conversions of existing accessory structures, including garages, into ADUs, requires ministerial approval, and limits the ability of a local agency to demand replacement parking when a garage is converted. The county's zoning code does not impose a unique garage-conversion permit beyond the standard building permit and any required ADU or zoning clearance. Because converting an attached garage usually removes covered parking, applicants should confirm whether the underlying residential zone's parking standards (Chapter 18.102) still require off-street spaces, subject to the state ADU parking limits. Owners should always pull a building permit; an unpermitted conversion can become a code-enforcement and resale problem.