In unincorporated Cook County, a permit is required for all new sheds and detached storage structures, including prefabricated units, above certain size thresholds. Sheds over 144 square feet require electrical service. All sheds must comply with zoning setbacks and lot coverage limits.
The Cook County Department of Building and Zoning requires permits for new sheds, detached garages, and outdoor storage structures in unincorporated areas. Small accessory structures under 100 square feet may be exempt from building permits but still must comply with zoning requirements (setbacks, lot coverage). Sheds over 144 square feet will require electrical service and associated permits. All sheds require compliance with the Cook County Zoning Ordinance, including rear and side yard setback requirements (typically 3-5 feet depending on zone), lot coverage maximums, and height limits (typically 15 feet for accessory structures). Prefabricated and modular sheds above 4 feet in height also require permits. Sheds must not be placed in easements, drainage ways, or floodplains. A site plan showing the proposed shed location relative to property lines and existing structures is required with the permit application.
Building a shed without a required permit results in a violation notice with 30 days to apply for an after-the-fact permit. Double permit fees may apply. Sheds that cannot meet code may need to be removed.
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See how Cook County's shed & outbuilding permits rules stack up against other locations.
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