ADU Tips, Costs & Regulations in Los Angeles

Four new California ADU laws take effect in 2027. Here’s what the 2027 ADU regulations mean for homeowners and investors: two detached ADUs under AB 956, lower impact fees on larger ADUs under SB 1117, tighter plan checks under AB 1621, and smoother SB 9 projects under AB 2601. Plus two honorable mentions.

Can you build an ADU on your property? For most Los Angeles homeowners, the answer is yes – California state law now guarantees the right to build at least one ADU on nearly any residential lot.

Complete guide to JADUs in California. Learn requirements, costs, and 2026 law updates (AB 1154), plus when a JADU vs ADU makes sense.