Accessory Dwelling Units

The City of Chicago adopted an ordinance re-legalizing accessory dwelling units on Wednesday, December 16, 2020. It allows a backyard house or interior ADU at properties in one of the 5 pilot areas and also within a RS-2, RS-3, RT, or RM zoning district.

Properties with 5 or more units can have 2 or more interior ADUs, but no backyard house.

A triptych of three renderings of a backyard house on a vacant lot (by Booth Hanse); two additional basement units by Civic Projects; and a backyard house on an improved lot by LEVEL.

4-minute ADU explainer video

Get building in Chicago

1. Check your address

Look up an address to check eligibility

2. Review city guidance

Chicago's official info

Find the intake form

3. Contact an architect or builder

Directory of ADU designers & builders

More resources


Data about ADUs

Sign in or create a free account to view our "Data about ADUs".