· State law
SB 543 takes effect: no impact fees at 750 sq ft or less, now in Gov. Code 66311.5
SB 543 (Chapter 520, Statutes of 2025) took effect January 1, 2026. It restates the impact-fee rule in Gov. Code 66311.5: no impact fees on an ADU of 750 sq ft of interior livable space or less, or a JADU of 500 sq ft or less; above that, fees must be proportional to the primary home. It also caps JADUs at 500 sq ft of interior livable space. Many city documents still cite the older section numbers (65852.2 or 66324).
Revises the limitations on impact fees to, instead, prohibit impact fees upon the
Added Oct 18, 2026.