Illinois · IL
Illinois residential & ADU permit data
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Housing law
Accessory dwelling units in Illinois are regulated locally; there is no statewide ADU mandate, with Chicago running its own ADU ordinance.
Illinois has no statewide upzoning law; residential density is set by local zoning.
Local zoning (no statewide mandate)
Jurisdictions we cover
Chicago
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Sourced live from the Chicago Data Portal (data.cityofchicago.org building permits, public records).
Informational only, not legal advice. Housing law changes — verify current statutes before relying on this.