Garage conversion rules in Romeoville, IL — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions in Romeoville require building permits and must comply with Chapter 159 Zoning requirements. Converted garages must maintain required off-street parking. Illinois has no state-mandated garage-to-ADU conversion allowance. Contact the Building Division at 815-886-7200 for permit requirements and current zoning guidance.
Converting an attached or detached garage to living space in Romeoville's city limits requires a building permit and must meet habitable room standards. Conversions must include proper egress windows, insulation to current energy code, minimum ceiling height (7 feet 6 inches), electrical upgrades, and HVAC. If the garage provided required off-street parking, the property owner may need to demonstrate alternative parking (driveway, carport) or obtain a parking variance. Garage conversions to ADUs have additional requirements including kitchen, bathroom, and separate entrance. The conversion must comply with the property's zoning district setback and lot coverage limits.
Unpermitted garage conversions face fines of $500–$2,000, mandatory permit acquisition (double fees), and may need to be restored to garage use if code requirements cannot be met.
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