Garage conversion rules in Joliet, IL — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Joliet requires building permits for garage conversions to living space. Converted spaces must meet all habitable space standards under the adopted International Residential Code including heating, plumbing, electrical, and egress requirements.
Converting a garage to living space in Joliet requires a building permit from the Building Inspectional Services Division. The converted space must meet all habitable space requirements under the International Residential Code as adopted by the city under Section 8-175. This includes minimum ceiling height, natural light and ventilation, heating facilities, smoke and carbon monoxide detectors, proper electrical circuits, and adequate egress windows. The zoning ordinance's parking requirements must also be considered, as eliminating a garage may create a parking deficiency that requires a variance. Under Section 8-9, existing structures undergoing alteration must comply with building code requirements for the altered portions.
Conversion without a permit subject to fines up to $750 per offense. Unpermitted work may be ordered reversed.
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Side-by-side rule comparisons with other cities in Will County.
See how other cities in Will County handle garage conversions.
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