ADU rules in Urbana, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Illinois has no statewide ADU mandate. The City of Champaign legalized one accessory dwelling unit per residential lot in June 2022, capped at 600 or 800 square feet by lot size.
Contrary to a common misconception, Illinois has not enacted a statewide ADU law; bills such as the Local Accessory Dwelling Unit Act have been introduced but not passed, so local zoning governs. Champaign City Council adopted Bill 2022-117 on June 21, 2022, allowing one accessory dwelling unit in any residential district, limited to 600 square feet on lots under 7,200 square feet and 800 square feet on larger lots. A building permit and zoning review are required. In unincorporated Champaign County, a second dwelling needs zoning approval under the county Zoning Ordinance. HOAs may add restrictions.
Occupying an accessory dwelling built without a permit is a code violation. The city or county can require the unit legalized to building-code standards or removed.
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See how Urbana's adu rules rules stack up against other locations.
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