Shed permit rules in Fitchburg, WI — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Fitchburg permits residential storage sheds up to 400 square feet in floor area and 15 feet in height, with a minimum 4-foot setback from any side or rear lot line and the principal-structure front-yard setback. A Deck and Shed Permit is required for any shed 64 square feet or larger; sheds smaller than 64 square feet are permit-exempt but must still meet setback and lot-coverage rules.
Fitchburg's Building Inspection Division publishes the residential storage standards on the city Residential Storage page and administers permits under Chapter 35 (Buildings and Building Regulations) and Chapter 22 (Zoning). Storage sheds and accessory buildings that do not house motor vehicles are limited to 400 square feet of floor area and 15 feet in height, and may not exceed the height of the principal dwelling. The minimum side and rear yard setback is 4 feet from any lot line, and the shed must obey the front-yard setback that applies to the underlying residential district. A building permit (the Deck and Shed Permit Application) is required for every shed 64 square feet or larger; sheds under 64 square feet are exempt from the building permit requirement but must still comply with zoning setbacks, height, and the citywide lot-coverage cap. Total lot coverage by the principal dwelling, sidewalks, and all accessory structures (including decks) cannot exceed 35 percent. Detached garages or carports larger than 400 square feet are treated as larger accessory structures with stricter setbacks (generally 10 feet side, 35 feet rear, 30 feet front) and require a building and zoning permit with site plan and materials list. Wisconsin's Uniform Dwelling Code (SPS 320–325) sets baseline construction standards for one- and two-family dwellings, and Wis. Stat. §62.23 grants Fitchburg zoning authority over accessory structures through Chapter 22. Properties in SmartCode-zoned districts follow Chapter 23 instead of the standard Chapter 22 schedule.
Building a shed without a required Deck and Shed Permit, exceeding 400 square feet, exceeding 15 feet in height, or placing the shed within 4 feet of a lot line violates Fitchburg Code Chapters 22 and 35. Building Inspection (608-270-4240) can issue stop-work and correction orders, require after-the-fact permitting, and refer continuing violations for citation and forfeiture. Lot coverage above 35 percent must be reduced before a permit is issued.
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