Illinois · IL
Illinois residential & ADU permit data
Chicago leads a major Midwestern market
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
Cities we cover in Illinois
Live dataExplore live, sourced permit activity for each Illinois jurisdiction.
Why Igni for Illinois
Anchored by Chicago, one of the largest US permitting markets
Live Chicago permit data, built on its mature open-data portal
First-mover on Chicago's ADU ordinance and coach-house conversions
Illinois ADU & permit data — FAQ
Does Illinois allow accessory dwelling units (ADUs)?
Accessory dwelling units in Illinois are regulated locally; there is no statewide ADU mandate, with Chicago running its own ADU ordinance.
What is Illinois's missing-middle / upzoning law?
Illinois has no statewide upzoning law; residential density is set by local zoning.
Where does Igni get Illinois permit data?
Sourced live from the Chicago Data Portal (data.cityofchicago.org building permits, public records).
Which Illinois cities does Igni cover?
Igni has live permit coverage for Chicago in Illinois, with more jurisdictions expanding.
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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.