Accessory Structures in Marysville, WA (2026)
3 verified accessory structures rules for Marysville, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Marysville City Council adopted an interim ordinance on June 23, 2024, to comply with state HB 1337, allowing up to 2 ADUs per single-family lot. Final regulations are expected in fall 2025. HB 1337 requires: min. 1,000 sq ft ADU; 24 ft height minimum; no owner-occupancy required; impact fees capped at 50% of principal unit. Building permit required.
Marysville ADU Rules & Accessory Dwelling Unit Regulations
Some RestrictionsShed Rules
Sheds and detached accessory structures must comply with MMC Ch. 22C.180 (Accessory Structures) and the Washington State Building Code (WAC 51-50). Permit requirements depend on size; small structures may be exempt from a full building permit but must still meet setback requirements. Contact the Permit Portal.
Marysville Shed Rules & Outbuilding Regulations
Some RestrictionsGarage Conversions
Garage conversions to habitable space or ADUs require a building permit under WAC 51-50 and MMC. HB 1337 (2023) facilitates conversions to ADUs, allowing conversions even from existing structures that violate current setback or lot coverage rules. Contact the permit office for guidance.
Marysville Garage Conversion Rules & Requirements
Some RestrictionsLooking for Snohomish County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Marysville city rules.
Accessory Structures in Snohomish County →