Garage conversion rules in Peoria County, IL — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Turning a garage into living space in the City of Peoria or unincorporated Peoria County is a change of occupancy that needs a building permit. Inspectors check egress, insulation, and smoke and carbon-monoxide alarms.
A garage conversion turns non-habitable space into a habitable room, so the City of Peoria and Peoria County permit it under the International Residential Code and energy code they enforce. Inspectors review egress windows, ceiling height, insulation to Illinois' cold-climate zone, and smoke and carbon-monoxide alarms; new wiring, plumbing, or heating draws its own permit. Because the city sets minimum off-street parking for a dwelling, a conversion that removes a required parking space may need zoning relief. In the unincorporated county, converting a garage to living area or a second dwelling triggers both zoning and building review. HOAs commonly prohibit garage conversions outright.
Converting a garage to living space without a permit is illegal construction subject to a stop-work order. The city or county can require the space brought to code or restored to a garage.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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