Assembly committee backs prorated ADU impact fees to remove fee "cliff"

Jun 10, 2026

SB1117 would prorate impact fees so local governments charge only for the square footage of an ADU above 750 sq ft; supporters said the change removes a $12,000–$28,000 penalty that stalls projects, while special districts warned about lost infrastructure revenue.

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Author of SB1117 told the committee the bill clarifies existing accessory dwelling unit (ADU) law so local governments assess impact fees only on the portion of an ADU that exceeds 750 square feet rather than on the entire unit once it crosses the threshold. The sponsor said the change would reduce unnecessary cost burdens that can halt projects.

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