Shed permit rules in Marysville, WA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
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's building code for city limits permits storage sheds, workshops, and other accessory buildings on residential properties. Structures under 120-200 square feet (threshold varies by zone) are typically exempt from building permits but must still meet setback requirements (usually 3-5 feet from property lines). Larger structures require building permits with plans. Sheds may not be used for habitation, business operations with customers, or as rental units. Maximum height is typically 12-15 feet. The total area of all accessory structures generally cannot exceed 50% of the rear yard area. Pre-fabricated sheds delivered intact must still meet setback and maximum coverage requirements.
Unpermitted structures receive a notice to either obtain a retroactive permit (with double fees) or remove the structure within 60 days. Fines of $100–$500 apply for non-compliance.
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