ADU rules in Cook County, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Accessory dwelling units in unincorporated Cook County are subject to the Cook County Zoning Ordinance (Ord. 01-O-30). ADUs may be permitted in certain zoning districts as accessory uses. A building permit and zoning compliance are required.
Accessory dwelling units (granny flats, in-law suites) in unincorporated Cook County are governed by the Cook County Zoning Ordinance (Ord. 01-O-30). ADUs may be permitted as accessory uses in certain residential zoning districts. The structure must comply with the adopted 2009 International Residential Code for habitable space, including egress, ventilation, and electrical requirements. Building permits are required from the Department of Building and Zoning. The ADU must meet setback requirements for the applicable zoning district. The Cook County Board has considered amendments to expand ADU permissions. Zoning classifications range from R-1 (single-family residential) through R-5, each with different accessory structure provisions.
Unpermitted ADU: building violation, $100–$1,000 fine. Non-conforming use: must obtain variance or cease use. 30 days to comply.
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See how Cook County's adu rules rules stack up against other locations.
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