ADU rules in Sangamon County, 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. Sangamon County regulates accessory uses through Title 17 (Zoning Ordinance, adopted 1969) under 55 ILCS 5/Division 5-12. Springfield separately regulates ADUs under home rule through Code of Ordinances Chapter 155 (Zoning).
Counties Code 55 ILCS 5/5-12001 grants Sangamon County zoning authority over unincorporated land. Title 17 of the County Code (adopted April 22, 1969, amended) governs accessory buildings and uses through Chapter 17.36, with yard/setback rules in Chapters 17.38 and 17.42. Illinois has no statewide ADU statute, so each jurisdiction sets its own rules. Springfield, a home rule city under Illinois Constitution Art. VII §6, regulates residential uses through Chapter 155 of its Code of Ordinances. Variance and conditional use petitions go before the Sangamon County Zoning Board of Appeals, which recommends to the County Board under 55 ILCS 5/5-12009.
Building or occupying a second dwelling unit without zoning approval violates Title 17 and 55 ILCS 5/5-12001. Penalties include stop-work orders, restoration orders, and daily fines. Springfield enforces Chapter 155 violations through Public Works.
Sangamon County, IL
Sangamon County (the seat of state capital Springfield) does not enforce a county-wide decibel-based noise ordinance with set quiet hours for unincorporated ...
Sangamon County, IL
In unincorporated Sangamon County, fences are regulated under the Sangamon County Zoning Ordinance, Title 17 (adopted April 22, 1969, as amended), with the s...
Sangamon County, IL
Sangamon County requires all dogs (and cats and companion animals) to be restrained at all times when off the owner's property - either on a leash or under a...
Sangamon County, IL
Illinois bans most consumer fireworks under the Pyrotechnic Use Act (425 ILCS 35). Only sparklers, snake pellets, smoke devices, party poppers, and small cap...
Sangamon County, IL
Unincorporated Sangamon County has no STR-specific parking rule. The 1969 Sangamon County Zoning Ordinance Chapter 17.50 (Off-Street Parking and Loading) set...
Sangamon County, IL
Unincorporated Sangamon County has no STR-specific overnight occupancy cap. The 1969 Sangamon County Zoning Ordinance (Title 17) does not address short-term ...
See how Sangamon County's adu rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.