ADU rules in Marysville, WA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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's zoning code permits accessory dwelling units (ADUs) in single-family residential zones. ADUs may be attached (converted garage, addition) or detached structures. Size is typically limited to 800-1,200 square feet or 50% of the primary dwelling's floor area, whichever is less. Setback requirements match those for accessory structures (typically 5 feet from side and rear property lines). Owner occupancy of either the primary or accessory unit may be required. ADUs must meet current building code, include independent kitchen and bathroom facilities, and comply with county utility connection requirements. Washington state legislation may further shape local ADU rules.
Unpermitted ADUs face stop-work orders and removal or legalization requirements. Fines of $500–$2,000 apply for unpermitted construction. Properties with illegal ADUs may face title issues at sale.
Marysville, WA
Marysville does not have a commercial airport. Paine Field (PAE) in Everett is approximately 20 miles to the south. Aircraft noise is regulated federally by ...
Marysville, WA
Barking dogs that cause a public nuisance are subject to MMC Ch. 6.76. Noise originating from property that is a public nuisance is unlawful. Animal control ...
Marysville, WA
Under MMC Ch. 6.76 (Ord. 3204, 2022), construction noise is prohibited before 7 a.m. and after 9 p.m. Construction is defined broadly to include site prepara...
Marysville, WA
Marysville noise is regulated by MMC Ch. 6.76, which adopts WAC 173-60 Environmental Designation for Noise Abatement (EDNA) standards. Noise limits for resid...
Marysville, WA
The Community Service Unit (CSU) investigates abandoned vehicles on public property and enforces junk vehicle codes on private property. For impounded vehicl...
Marysville, WA
Street parking in Marysville is regulated by the Community Service Unit (CSU), which enforces state and MMC parking laws. The CSU addresses parking violation...
Side-by-side rule comparisons with other cities in Snohomish County.
See how other cities in Snohomish County handle adu rules.
See how Marysville's adu rules rules stack up against other locations.
Quick Compare
Help us keep this page accurate. If you notice an error or outdated information, let us know.