Per California Government Code §66323 (as amended by SB 543, 2025), Riverside may not charge any development impact, capacity, or connection fee on an ADU of 750 sq ft or less. For ADUs larger than 750 sq ft, the city's impact fees must be charged proportionately to the size of the primary dwelling.
California Gov. Code §66323 — implemented in Riverside through RMC Chapter 19.442 and the city's Development Impact Fee schedule under RMC Chapter 16.84 — exempts ADUs with 750 sq ft or fewer of interior livable space from all impact fees, capacity charges, and connection fees. JADUs (≤500 sq ft) are similarly exempt. For ADUs over 750 sq ft, Riverside must calculate any DIF proportionally to the primary dwelling's square footage (e.g., an 1,100 sq ft ADU on a 2,200 sq ft house pays at most 50% of the single-family DIF rate). Plan-check and building-permit fees set by the City Council's master fee schedule are separate from impact fees and remain payable; the city's adopted ADU plan-check fee is published by the CEDD. Water and sewer connection fees for an ADU within an existing single-family lot may not require a separate or upgraded utility connection per Gov. Code §66322.
A homeowner charged an impact fee in violation of Gov. Code §66323 may demand a refund and, after exhausting administrative remedies under Gov. Code §66020, sue to recover the unlawfully collected fee with interest. The city is required to refund fees collected in error.
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