Yuba City may not charge any impact fees on ADUs of 750 sq ft or smaller; larger ADUs are charged proportionally to the primary dwelling under Cal. Gov. Code §65852.2(f)(3).
Cal. Gov. Code §65852.2(f)(3) preempts local impact fees on ADUs of 750 sq ft or smaller — no city, special district, school district, or water corporation may impose any impact fee on such an ADU. Yuba City applies this exemption directly. For ADUs larger than 750 sq ft, impact fees must be charged proportionally to the ratio of the ADU's square footage to the primary dwelling's square footage. Building, plan-check, plumbing, mechanical, and electrical permit fees are separate from impact fees and are still owed regardless of size — these are calculated on the City's Building Permit Fee Calculation Worksheet (effective July 1, 2025), which lists a permit-tech plan review fee of $223.20 plus valuation-based building permit fees. School impact fees for Yuba City Unified follow the same §65852.2(f)(3) exemption, as confirmed by Ed. Code §17620 read together with the Government Code preemption.
If the City attempts to assess a prohibited impact fee on a ≤750 sq ft ADU, the applicant may demand a refund and, if denied, file a writ of mandate under CCP §1085. Applicants who fail to pay lawfully owed permit fees and proportional impact fees on larger ADUs will not receive a certificate of occupancy and may face stop-work orders.
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