Shed permit rules in Madison, WI — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Madison requires a zoning permit for sheds over 150 square feet and a building permit for structures over 200 square feet. Setbacks are typically 3 feet from side and rear lot lines per MGO 28.
Under MGO 28, accessory storage structures (sheds) up to 150 square feet do not require a zoning permit but must still meet setback and placement rules. Sheds between 150 and 200 square feet require a zoning permit issued by the Planning Division. Sheds exceeding 200 square feet or 10 feet in height require a building permit from Building Inspection under the WI Uniform Dwelling Code (SPS 320-325). Standard setbacks are 3 feet from side and rear lot lines and behind the front facade of the principal dwelling. Maximum cumulative accessory structure coverage is generally 10 percent of rear yard area. Sheds may not be used as habitable space and cannot connect to sanitary sewer without being reclassified as an ADU. Historic districts may require additional Landmarks Commission review. Properties in shoreland overlay face reduced coverage limits.
Unpermitted sheds can be ordered removed or retroactively permitted with double fees. MGO 28 forfeitures range from 150 to 500 dollars.
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