California ADU Builders

California is the national leader in ADU construction — 26,924 ADUs were permitted in 2023 alone, about 21% of all new housing permits in the state. A series of state reforms (including AB 68, AB 881, and subsequent ADU laws) require ministerial, by-right approval in most cases, cap impact fees, and bar owner-occupancy mandates for many ADU types. Typical projects run $150,000–$400,000+ depending on type, size, and city; detached new-construction ADUs in Los Angeles average around $250,000.