Governor Newsom has signed AB 1154 and SB 543. This means that beginning January 1, 2026, California homeowners can add three ADUs (one detached, one interior conversion, and one <500sf JADU) to a single family property and rent all four units (3 ADUs plus the main house) to tenants with no owner-occupancy requirement.
adu的好处就是州级别法律，60天city不返回意见等同于通过
坏处就是仍然要对标最新的木头房子建筑标准，合规麻烦
city对层数层高最大面积仍有规定，在不影响车位的情况下难以最大化可用面积
