California Expands ADU Options Again

California signed two new ADU laws, effective January 1, 2027, requiring local agencies to approve up to two detached ADUs on single-family lots.
On qualifying single-family lots, owners can reach three total units through allowed mixes that include converted ADUs, JADUs, and detached new-construction ADUs.
Local agencies may still apply up to 4-foot side and rear setbacks, an 800 sq-ft cap, and the statutory height limit per unit.
State limits on HOA rules and private covenants now extend to any zoning district that allows a single-family home as the primary use.
For up to two larger ADUs, impact fees now exclude the first 750 sq-ft, while California agencies must update ordinances before January 1, 2027.