Garage conversion rules in Lake County, IL — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions in unincorporated Lake County require building permits and zoning compliance. Basements are not permitted in accessory structures. Required parking must be maintained.
Converting a garage in unincorporated Lake County requires a building permit and compliance with the UDO. The adopted building code (2024 ICC series) governs habitable space requirements. Note that basements are not permitted in accessory structures, and attics may only be used for storage (max 6-ft rafter/ceiling height). Required off-street parking per the zoning district must be maintained. Contact Planning, Building and Development at 847-377-2600.
Unpermitted conversion: building code enforcement. Must bring to code or restore. Safety violations: immediate correction.
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See how Lake County's garage conversions rules stack up against other locations.
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