Accessory Structures in Marysville, WA (2026)
7 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 allows two accessory dwelling units per single-family lot with no owner-occupancy requirement, a change driven by Washington's 2023 ADU law. Under MMC Section 22C.185.020, each unit must run 200 to 1,400 square feet, stay under 30 feet tall, and meet five-foot side and 15-foot rear setbacks, with review by the community development director.
Marysville ADU Dimensional and Density Standards
Some RestrictionsMarysville Municipal Code § 22C.185.020, Table 1
Table 1. Number of accessory dwelling units allowed per lot: Two. Allowed accessory dwelling unit configurations: (a) One attached unit and one detached unit; (b) Two attached units; or (c) Two detached units, which may be comprised of either one or two detached structures. Minimum size per accessory dwelling unit: 200 SF gross floor area. Maximum size per accessory dwelling unit: 1,000 SF gros...
ADU Impact Fees
Marysville exempts accessory structures and city-approved accessory dwelling units from its park, recreation, open space and trail impact fees. Marysville Municipal Code § 22D.020.040(1)(b) exempts accessory structures outright, and (1)(g) exempts ADUs approved under Chapter 22C.180 MMC, even though a standalone single-family or middle-housing unit otherwise owes $1,251 per housing unit under the city's adopted fee schedule.
Marysville ADU Impact Fee Exemption
Few RestrictionsMarysville Municipal Code § 22D.020.040(1)(b), (g)
(1) The following are excluded from the requirement to pay some or all of the required impact fees: ... (b) The construction of structures accessory to a residence is exempt from the requirement to pay all impact fees. (c) Parking garages and building space which is constructed solely to park motor vehicles which are not owned, leased or rented by a business or part of a stock in trade are exem...
ADU Owner Occupancy
Marysville imposes no owner-occupancy requirement on the principal home or an accessory dwelling unit -- the standards table lists the requirement as 'None,' reflecting a 2023 state-law bar on local mandates.
Marysville Has No ADU Owner-Occupancy Rule
Few RestrictionsMarysville Municipal Code § 22C.185.020
Owner occupancy requirement for principal dwelling or accessory dwelling units None Allowed accessory dwelling unit configurations (a) One attached unit and one detached unit; (b) Two attached units; or (c) Two detached units, which may be comprised of either one or two detached structures. Use as short-term rental Prohibited Minimum size per accessory dwelling unit 2 200 SF gross floo...
ADU Rental Restrictions
Marysville's accessory dwelling unit code flatly bars using an ADU as a short-term rental, defined as lodging offered for a fee for fewer than 30 consecutive nights. MMC Section 22C.185.020's Table 1 pairs that ban with no owner-occupancy requirement, so an ADU can be rented long-term without the owner living on site, just never rented nightly.
Marysville Bans Short-Term Rental of ADUs
Significant RestrictionsMarysville Municipal Code § 22C.185.020, Table 1; § 22A.020.200
Owner occupancy requirement for principal dwelling or accessory dwelling units: None. ... Use as short-term rental: Prohibited. ... "Short-term rental" means a lodging use, that is not a hotel or motel or bed and breakfast, in which a dwelling unit, or portion thereof, is offered or provided to a guest by a short-term rental operator for a fee for fewer than 30 consecutive nights. ... all acces...
Shed & Carport Rules
Marysville caps residential accessory structures at 80 percent of the primary home's footprint on lots under an acre, with a 5-foot side setback, a 5-foot one-story rear setback, and a 20-foot height limit unless the lot exceeds an acre.
Marysville Accessory Structure Standards
Some RestrictionsMarysville Municipal Code § 22C.180.020(1)
Side setback ... 5 feet ... Rear yard setback ... 5 feet (one-story structure); 10 feet (when the entrance faces the rear yard or for two-story or greater structure in PRDs); 15 feet (two-story structure ...) ... Accessory structure footprint ... On lots under one acre, accessory structures are further limited to 80 percent of the footprint of the primary residence. ... Height ... 20 feet (lots...
Garage Conversions
Marysville lets an existing detached garage convert to an accessory dwelling unit even if it doesn't meet current setback or building-coverage requirements, waiving those two standards only.
Marysville Garage-to-ADU Conversion Rule
Few RestrictionsMarysville Municipal Code § 22C.185.020
Existing structures, including but not limited to detached garages, may be converted to accessory dwelling units, even if they do not comply with current code requirements for setbacks or building coverage. 5 Detached accessory dwelling units may be built at a lot line, if the lot line abuts a public alley. 6 No parking areas other than driveways may be in front yards. When the property abuts...
Tiny Homes
Marysville allows up to two accessory dwelling units per lot under state-mandated ADU rules, but a detached ADU can't have axles or sit on a chassis: ruling out tiny homes on wheels as legal ADUs.
Marysville ADU Rules Bar Wheeled Tiny Homes
Some RestrictionsMarysville Municipal Code § 22C.185.020(2)
The architectural character of the single-family dwelling shall be preserved. Exterior materials, roof form, and window spacing and proportions shall match that of the existing single-family dwelling. In no case shall a detached accessory dwelling unit have axles or be on a chassis. (3) The city may not prohibit the sale or other conveyance of a condominium unit independently of the principa...
Looking for Snohomish County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Marysville city rules.
Accessory Structures in Snohomish County →