ADU rules in Lake County, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Lake County allows accessory dwelling units in unincorporated areas with limits: no more than one bedroom and no larger than 1,000 square feet. Building permits required.
Lake County UDO permits accessory dwelling units in unincorporated areas with clear limitations. ADUs must have no more than one bedroom and be no larger than 1,000 square feet in gross floor area. A basement is not permitted in any accessory structure (crawl space allowed). Illinois HB 2373 (2024) encourages ADU development statewide. Building permits required. Contact Planning, Building and Development at 847-377-2600 for specific requirements.
Unpermitted ADU: building code enforcement. May require demolition or legalization. Occupying unpermitted dwelling: code violation.
Lake County, IL
Barking dogs in unincorporated Lake County are addressed as nuisance complaints through the Public Nuisance Ordinance. Lake County Animal Care and Control in...
Lake County, IL
Lake County Public Nuisance Ordinance prohibits sound from amplification equipment audible at 100 feet or more from the source, or exceeding 70 dB(A) at the ...
Lake County, IL
Chapter 94 of the Lake County Code regulates construction hours and noise in unincorporated areas. Standard construction hours apply with enforcement through...
Lake County, IL
Lake County IL regulates amplified music through the UDO noise performance standards and municipal ordinances. Outdoor amplified events require special event...
Lake County, IL
Maximum fence height in unincorporated Lake County is 6 feet. Fences exceeding 6 feet in nonresource zones require a building permit. Sight-obscuring fences ...
Lake County, IL
Illinois Fence Act (765 ILCS 130) governs agricultural boundary fences. In residential unincorporated Lake County, fences must be entirely on private propert...
See how Lake 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 If you notice an error or outdated information, let us know.