Accessory Structures in Castaic, CA (2026)
2 verified accessory structures rules for Castaic, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Castaic is an unincorporated CDP in Los Angeles County governed by LA County Code Title 22 §22.140.640 (Accessory Dwelling Units and Junior Accessory Dwelling Units), most recently amended April 2024. Single-family lots may add one ADU plus one JADU; multifamily lots may add up to two detached new-construction ADUs plus conversion ADUs created in non-livable existing space.
Castaic ADU Rules (LA County Title 22)
Some RestrictionsGarage Conversions
Garage conversions to ADUs in unincorporated Castaic are governed by LA County Code Title 22 §22.140.640 and California Government Code §65852.2. No replacement parking is required when an existing garage is converted, and the existing garage's setbacks are grandfathered. Properties in Very High Fire Hazard Severity Zones also trigger Chapter 7A wildland-urban interface standards.
Castaic Garage Conversion to ADU (LA County)
Some RestrictionsLooking for Los Angeles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Castaic city rules.
Accessory Structures in Los Angeles County →