ADUs in Chicago

Now that an ADU ordinance has been adopted (on December 16, 2020), this map is no longer necessary.

ADU Supporters

18 aldermanic supporters (in green and yellow); current as of October 9, 2020.

This map is imperfect, and may not accurately represent each alder's position as one of three colors.

During the 2019 ward elections, we tracked the support indicated by the candidates on the Chicago Cityscape blog. Since then we've launched a petition and a letter-writing campaign.

How do I build an ADU?

Come Fall 2020

An ordinance was proposed to Chicago City Council on May 20, 2020, that would allow the addition of "conversion units" (interior ADUs) and new coach houses on all R-zoned lots, including on vacant lots (read our FAQs).

Previously: If it was going to be adopted in July 2020, it would have become effective on August 1, 2020, to coincide with the mandatory use of the 2019 Chicago Building Code. Permits could be issued as early as August 1, 2020.

Now: A joint committee vote on July 21, 2020, and a City Council vote on July 22, 2020, has been postponed. As of September 28, 2020, there is no publicly known plan on how this is moving forward.

Now

ADUs in the form of basement and attic units are already possible for some property owners. It depends on their property's zoning district, how many units are currently in the house, and size of the available space in the building. An ordinance to more broadly legalize ADUs would remove the zoning district and current unit count factors.

New coach houses are not allowed currently. An ADU ordinance will likely re-legalize backyard homes, including coach houses.

Outside Chicago

Evanston: Read this brochure from the Evanston Development Cooperative (EDC)

Oak Park: Review Section 9.3(K) in the Village of Oak Park zoning code [PDF].

What is Chicago Cityscape?

Chicago Cityscape makes neighborhood, property, and construction development data accessible to all.
We serve non-profit organizations, construction service providers, zoning attorneys, brokers & property professionals, cannabis entrepreneurs, and all residents of Chicago and Cook County. Learn what solutions are best for you.

See sample reports: Address Snapshot, Place Snapshot

Learn about backyard homes & ADUs in Chicago

ADU Portal: FAQ, 4-minute video, and designer directory

The Chicago Departments of Housing and Buildings are accepting ADU permit applications.