Marysville, WA Accessory Structures: ADU Owner Occupancy (2026)

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 floor area Maximum size per accessory dwelling unit 2, 3

1,000 SF gross floor area or 50 percent of the total floor area of the single-family residence, whichever is greater; provided, that in no case shall an accessory dwelling unit exceed 1,400 square feet 1 Maximum bedrooms per accessory dwelling unit Two Front setback 4 See MMC § 22C.010.080 for standard lots and MMC § 22G.080.080 for PRD lots.

Side setback 4 Five feet Side street setback 4 10 feet along nonarterials; 15 feet along arterials Rear yard setback 4

15 feet; provided, that the rear yard setback may be reduced to 10 feet for one-story structures, or for structures located in a PRD 5 On-lot structure separation A minimum of five feet of separation is required between structures. A five-foot-wide paved pathway that is free of obstructions must also be provided between the front entrance of the accessory dwelling unit and the property line from which the property is addressed to ensure adequate access for emergency services. Building and impervious coverage 4