Accessory Structures in Topanga, CA (2026)
2 verified accessory structures rules for Topanga, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Topanga 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. Detached ADUs are capped at 1,200 sq ft; multifamily-lot ADUs have no maximum size under county rules. Topanga lies within the Santa Monica Mountains Coastal Zone, so a Coastal Development Permit also applies.
Topanga ADU Rules (LA County Title 22)
Some RestrictionsGarage Conversions
Garage conversions to ADUs in unincorporated Topanga are governed by LA County Code Title 22 §22.140.640 and California Government Code §65852.2. No replacement parking is required when a garage is converted to an ADU, and existing setbacks are preserved. A Coastal Development Permit applies in the Santa Monica Mountains Local Coastal Program area.
Topanga Garage Conversion to ADU (LA County)
Some RestrictionsLooking for Los Angeles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Topanga city rules.
Accessory Structures in Los Angeles County →