Garage conversion rules in Naperville, IL β sometimes called garage-to-ADU or accessory living unit conversions β govern permits, ceiling height, egress, and parking replacement.
Naperville requires building permits for garage conversions. Converting a garage to living space must comply with building codes, zoning requirements for off-street parking replacement, and residential occupancy standards under the 2018 IRC.
Converting a garage to living space in Naperville requires a building permit and compliance with the 2018 International Residential Code as adopted by the city. The conversion must meet habitable space requirements including minimum ceiling height, ventilation, egress windows, insulation, and electrical standards. Off-street parking requirements under Title 6, Chapter 9 must be maintained. If the garage conversion eliminates required parking spaces, alternative parking arrangements may need to be provided. The converted space must comply with fire separation requirements if the garage was attached to the dwelling. Inspections are required throughout the conversion process. Contact the TED Business Group for specific requirements.
Conversion without permit: stop-work order and fines. Non-compliant habitable space: correction required before occupancy. Loss of required parking: zoning violation.
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Side-by-side rule comparisons with other cities in DuPage County.
See how other cities in DuPage County handle garage conversions.
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