Shed permit rules in Cook County, IL — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Cook County requires a permit for all new sheds and detached garages, including prefabricated or modular structures over 4 feet tall. The Cook County Zoning Ordinance governs setbacks and placement in unincorporated areas.
A building permit is required for all new sheds, detached garages, and outdoor storage structures over 4 feet in height in unincorporated Cook County, including prefabricated and modular structures. The permit is obtained through the Department of Building and Zoning ePermit system. Accessory structures must comply with the Cook County Zoning Ordinance (Ord. 01-O-30) setback requirements, which vary by zoning district. Structures must be located on the same lot as the principal dwelling. Construction must comply with the adopted 2009 International Residential Code. Accessory structures generally must be in the rear yard and maintain appropriate setbacks from property lines and other structures. The lot coverage maximum for the zoning district must not be exceeded.
Shed without permit: building violation, $100–$1,000 fine. Setback violation: must relocate or remove structure. 30 days to comply.
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