Illinois

Illinois ADUAllowed checks.

Use a connected city page or enter an address. Official local sources remain final.

Quick answer

Illinois ADUAllowed coverage starts with local official sources and connected city pages.

Official ADU and zoning sources 1 connected market

State source posture

Local official sources

ADU eligibility depends on city code, zoning, parcel constraints, utilities, and building safety review.

Chicago ADUs are allowed through a city program with location and ordinance constraints; verify address eligibility.

Cite this page

Use this page as a public web reference, not an official agency record. The linked official source remains the final authority.

ADUAllowed. "Illinois ADUAllowed | Official Source Routes". https://www.aduallowed.com/states/il/. Reviewed Jun 2026. Source and citation notes