ADUs under 750 sq ft are exempt from all city development impact fees under California Gov Code §65852.2(f)(3). ADUs 750 sq ft and larger pay impact fees proportional to the primary dwelling. Napa cannot require new utility connections for ADUs sharing existing service.
Under Gov Code §65852.2(f)(3), a local agency, special district, or water corporation cannot impose any impact fee on an ADU smaller than 750 sq ft. This blanket exemption covers traffic, park, and most general impact fees in the City of Napa. For ADUs 750 sq ft or larger, Napa must charge impact fees proportional to the square footage relative to the primary residence. Water and sewer connection fees cannot exceed the proportional impact for ADUs sharing existing connections; new separate utility connections trigger full hookup charges. School impact fees apply only when the ADU is 500 sq ft or larger and are levied by Napa Valley Unified School District at the capped rate.
Cities that impose fees in violation of state law are subject to refund and possible attorney-fee awards under Gov Code §65852.2(o). Applicants should request a written fee itemization before paying and dispute any non-compliant charges.
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See how Napa's adu impact fees rules stack up against other locations.
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