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

Appleton's accessory-structure standards live in Sec. 23-43(g), "Setback, height and lot coverage restrictions." For residential lots, a detached shed, garage, carport, gazebo or pool house must sit at least 3 feet from the rear lot line, or 5 feet where the rear line abuts an improved public alley; the same 3-foot minimum applies to the side lot line beyond the first 60 feet of lot depth, matching the principal building's side setback for that first 60 feet. On a corner lot, the yard facing the second street must instead meet the abutting property's front-yard setback. Detached accessory structures are capped at 15 feet in height and one story, and any detached structure that exceeds 15 feet must instead meet the principal building's full setback requirements for the district. No accessory building may go up before the principal building exists or is under construction, and only one detached garage or carport is allowed per single- or two-family lot.

Size is capped by district. On R-1A, R-1B, R-1C and R-2 lots, Sec. 23-43(g)(1)i.2 sets a combined 1,600-square-foot ceiling on the total gross floor area of all detached accessory buildings, garages, carports, sheds and gazebos on one lot, and that combined total can never exceed the gross floor area of the principal building itself. On R-3 lots the cap switches to 15% of lot area instead of a flat square footage. In non-residential districts (AG, P-I, NC, C-O, C-1, C-2, CBD, P, M-1, M-2) the ceiling rises to 25% of lot area and height rises to 25 feet. Every accessory building also counts toward the zoning district's maximum lot-coverage percentage.