5 county-level rules, plus city-specific rules for 3 cities in Will County, Illinois.
Verified from official government sources
Will County's zoning code (Chapter 155) does not broadly permit accessory dwelling units by right in all residential districts. ADU allowances vary by zoning district. Illinois HB 2373 (2024) encourages ADU development statewide but does not mandate local adoption. Contact the Will County Land Use Department for ADU feasibility in your zoning district.
Sheds and accessory structures in unincorporated Will County must comply with Chapter 155 Zoning Code setback and size requirements. Building permits may be required depending on size and utilities. The county zoning code specifies maximum lot coverage and setback distances by zoning district. Contact the Land Use Department for permit requirements.
Garage conversions in unincorporated Will County require building permits and must comply with Chapter 155 Zoning requirements. Converted garages must maintain required off-street parking. Illinois has no state-mandated garage-to-ADU conversion allowance. Contact the Land Use Department for permit requirements.
Will County municipalities require building permits for carports over 200 sq ft. Front yard carports generally prohibited. Attached carports must match home setbacks; detached require 3-10 ft side/rear setbacks depending on municipality.
Tiny homes on permanent foundations are treated as single-family dwellings under Will County LUO and IRC Appendix Q. Tiny homes on wheels classified as RVs under 625 ILCS 5 and generally cannot be used as permanent dwellings outside licensed RV parks.
3 cities in Will County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Will County Ordinance Hub →