Garage conversion rules in Kane County, IL — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Kane County has no ordinance that specifically authorizes garage-to-living-space conversions. Because only one residence per lot is allowed and a converted garage cannot become a second dwelling, any conversion to habitable space needs a building permit and must meet the residential building code and off-street parking rules.
The Zoning Ordinance does not list a distinct 'garage conversion' use. Converting a garage into finished living area is treated as an alteration of the principal dwelling and requires a building permit under the county's adopted building codes (Chapter 6). Because Section 25-5-5 permits only one residence per lot, a garage cannot be converted into a separate rental unit. Owners must also maintain any required off-street parking. Habitability, egress, and energy-code compliance are checked at permit review by the Development Department.
Unpermitted conversions are code violations; the county may require permits, inspection, restoration of parking, or reversal of the work, plus fines.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Kane County's garage conversions rules stack up against other locations.
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