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ADU law, permits and costs.

What changes in California ADU law, and what it means for your lot, explained in plain language.

ADU law · November 5, 2026 · 5 min read

What changes for ADUs in California on January 1, 2027

Two state laws take effect January 1, 2027. SB 1117 cuts impact fees on ADUs over 750 sq ft, and AB 956 allows two detached ADUs on a single-family lot.