Do I Need a Permit to Build a Shed in Wisconsin?

Wisconsin municipalities set their own thresholds for when an accessory structure like a shed requires a building permit. Milwaukee exempts structures under 120 square feet. Madison exempts structures under 200 square feet. Most cities fall between 120 and 200 square feet. However, even when a building permit is not required, you must still comply with zoning setback requirements — typically 3 to 5 feet from side and rear property lines. If your shed will have any electrical wiring (lighting, outlets), you will need an electrical permit regardless of the shed's size. Sheds placed on permanent foundations may trigger additional requirements. Pre-built, portable sheds that sit on blocks or skids may be treated differently than site-built structures in some municipalities. Key things to check before building a shed: your municipality's size threshold for building permits, setback requirements from property lines, maximum height (usually 15–20 feet for accessory structures), total lot coverage limits (all structures combined typically cannot exceed 30–40% of lot area), and whether your HOA or subdivision covenants impose additional restrictions. Failing to comply with setback rules — even for a permit-exempt shed — can result in a required removal order.

Check Your Municipality

Permit requirements, fees, and exemptions vary by municipality. Verify the specifics for your location.