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

In the Village of Ashwaubenon's R-1 and R-2 residential districts, Municipal Code Section 17-4-400(C)(3) sets a sliding cap on total accessory building square footage tied to lot size where the home has an attached one- or two-car garage: 576 square feet on lots under 15,000 square feet, 768 square feet on lots between 15,000 and 25,000 square feet, and 936 square feet on lots over 25,000 square feet. Height is capped at 15 feet for every accessory building in those districts. Setbacks differ depending on whether the lot has a two-car attached garage: with one, both the rear and side yards must be at least six feet; without one, the rear yard stays at six feet but the side yard drops to four feet.

Any accessory building over 576 square feet, including large sheds and workshops, must go before the Site Plan Review Committee under Section 17-2-200(B)(1)(a) before the Building Inspector issues a permit, and the owner must submit architectural plans drawn at one-fourth inch to a foot showing design, grade and materials. No accessory building may be built inside a utility easement, though an existing one may be rebuilt in the same spot if the Building Inspector finds its setbacks match the surrounding neighborhood pattern. The RE Rural Estate district runs on a separate parcel-size table, Table 17-4-400(1), rather than these R-1/R-2 tiers. Section 17-4-400(A)(2) makes a building permit mandatory for every accessory building village-wide, regardless of size, before construction can begin.