Marysville, WA Accessory Structures: ADU Impact Fees (2026)

Marysville imposes park, recreation, open space and trail impact fees under Chapter 22D.020 MMC, adopted under RCW 82.02.050(2) as part of the city's Growth Management Act comprehensive plan. Section 22D.020.030 requires payment before a building permit issues for most new development, with fees set by § 22D.020.050 at $1,251 per housing unit for single-family homes, mobile and manufactured homes, and middle housing, and $884 per unit for multifamily housing.

Section 22D.020.040 exempts several project types from all or part of that fee. Subsection (1)(b) exempts the construction of structures accessory to a residence from the requirement to pay any impact fees. Subsection (1)(g) separately exempts accessory dwelling units approved by the city under Chapter 22C.180 MMC. Other exemptions in the same subsection cover the replacement of an existing structure without added floor space or dwellings (if a permit is filed within three years of removal), stand-alone vehicle parking garages, temporary uses under Chapter 22C.110 MMC, and development activity already mitigated under SEPA. Subsection (2) requires the property owner to claim any exemption no later than the building permit application; the city treats a late claim as waived. Section 22D.020.080 lets a person challenge a fee decision through the same appeal process that applies to the underlying permit, or through a Title 22G administrative appeal where no other process exists, and permits payment of a disputed fee under written protest so the permit can still issue while the dispute proceeds.