Tiny home rules in Downers Grove, IL — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Illinois requires tiny homes built on permanent foundations to comply with the state-adopted residential building codes administered by the Capital Development Board.
The Capital Development Board Act (20 ILCS 3105) and the Illinois Building Commission Act (20 ILCS 3918) authorize statewide minimum construction standards. The state has adopted the International Residential Code as the baseline; tiny homes on foundations must meet IRC Appendix Q (300 sq ft minimum standards) where adopted, and manufactured tiny homes must comply with HUD code under 430 ILCS 115. RVs and park-model trailers fall under 625 ILCS 5 vehicle titling rules. Local zoning may impose minimum dwelling sizes.
Construction without code compliance can result in stop-work orders, denial of certificates of occupancy, and civil penalties under the Illinois Building Code.
DuPage County, IL
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Side-by-side rule comparisons with other cities in DuPage County.
See how Downers Grove's tiny homes rules stack up against other locations.
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