Davis, CA Accessory Structures: ADU Impact Fees (2026)

450(h) of the Davis Municipal Code sets out how the city charges impact fees, water and sewer fees, and utility connection charges for accessory dwelling units and junior accessory dwelling units. , but then carves out a size-based exception required by state ADU law: an ADU under seven hundred fifty square feet is not subject to impact fees at all, and an ADU of seven hundred fifty square feet or more is charged impact fees proportional to its square footage relative to the primary dwelling unit, rather than the full fee a new single-family home would pay.

Subsection (h)(2) adds that ADU water and sewer service can run through the primary dwelling's existing connection points rather than requiring a wholly separate service line, though the city may require a separate connection for an ADU that is not a conversion of existing space, subject to a connection fee or capacity charge proportionate to the ADU's burden on the system. Before the city will issue a building permit, subsection (h)(4) requires the applicant to provide a will-serve letter from the local water and sewer provider, or, for a property on a private septic system, documentation of building official approval in place of that letter.