Los Angeles ADU Builders
Los Angeles is the largest ADU market in the country, and detached new-construction ADUs here average around $250,000. Local design-build firms typically handle design, permitting, and construction under one roof — several have completed hundreds of ADUs. Statewide prefab manufacturers also deliver factory-built units anywhere in California.
5 builders based in the Los Angeles area
Cost basics
Detached ADU projects commonly run $150,000–$400,000+ depending on size and finishes; garage conversions cost less. Builders focused on the Los Angeles area can give project-specific pricing — several publish real example budgets on their profiles.
Permit basics
State law requires by-right approval of compliant ADUs in most cases, but local rules (setbacks, height, parking, historic districts) vary. Confirm requirements with your city's planning department before finalizing a design — or ask a local design-build firm, which handles permitting as part of the project.