Sauk County, WI Accessory Structures: Shed & Carport Rules (2026)

Section 7.075 of the Sauk County Code of Ordinances sets the accessory-structure standard for the Single Family Residential zoning district in unincorporated Sauk County. Section 7.075(1) limits every lot to one principal accessory structure and one secondary accessory structure, and requires both to meet all the building setback requirements that otherwise apply. The dimensional table tied to that subsection sets the principal accessory structure's maximum floor area by lot size: 600 square feet on a lot of 0 to 19,999 square feet, 900 square feet on a lot of 20,000 to 43,559 square feet, and 1,200 square feet on a lot of 43,560 square feet or more.

Section 7.075(2) caps the secondary accessory structure, such as a second shed, at 120 square feet regardless of lot size. Those floor-area caps sit alongside the district's general setback and height table in Section 7.094, which sets a 20-foot maximum height for accessory structures in the Single Family Residential district and requires a 10-foot side setback, 10-foot front setback, and 25-foot rear setback for both principal and accessory structures. A land use permit from the Zoning Administrator is required before a shed goes up under Section 7.153(1)-(2), except that Section 7.153(3) exempts any accessory structure of 120 square feet of floor area or less from that permit requirement, so long as the shed still meets every applicable setback.