Do I need a permit for shed or accessory structure in Arlington Heights?

Most likely yes. Shed or accessory structure usually requires a permit in Illinois. Confirm the specifics with Arlington Heights.

Illinois has no single statewide shed threshold, so the 200 square foot figure quoted from the model International Residential Code does not govern here. Requirements are set by each municipality, and the ones we have checked are stricter than that figure: Wheaton does not require a building permit for a shed of 120 square feet or less, and Joliet requires a shed permit with a Residential Accessory Structures Review Form and a plat of survey showing the shed location. Assume the local number rather than a national one, and ask your building department for the threshold that applies at your address before you buy the shed. Zoning setbacks, easements and lot coverage still apply where no building permit is needed, and running electrical or plumbing to the shed triggers its own permit. Arlington Heights reviews sheds, gazebos, and detached garages under its Accessory Structure (Residential) packet. A very small shed may fall under an exemption, but larger structures and any detached garage require a permit, so confirm the size threshold with Building & Life Safety at 847-368-5560 before you build. Accessory structures must meet the Village's zoning setback rules whether or not a permit is required, and the plat of survey must show the exact proposed location. Applications are filed electronically through the Civic Access Portal. Anyone other than the property owner who performs the work, even without pay, must be registered as a contractor with the Village before the permit is issued.