Chicago Cityscape - Accessory Dwelling Units (ADU) Supporters in Chicago

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.

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].

ADU service providers

Who can design and build an ADU for me?

The following service providers are interested in designing and building ADUs in Chicago, and have relevant experience.

Are you an ADU service provider?

Architects, vendors, contractors, manufacturers, and other firms who are based in Chicago and would like to be listed here should contact us and describe and show examples of relevant work. Chicago Cityscape does not recommend or vouch for any particular ADU service provider listed here.

ADU Supporters