The City of Chicago's Additional Dwelling Unit (ADU) program allows homeowners and other residential property owners to add living space in basement or attic apartments, or in backyard coach houses.
Applying for an ADU is a two-stage process. First, this application will ensure you qualify for the ADU program. Then, once you've received approval, you can apply for a building permit with the Department of Buildings.
Before you can apply for a permit with DOB, you will also need to submit a neighbor notification affidavit, as well as documentation for affordable units if you are applying to create two or more ADUs. You can find those documents at Chicago.gov/ADUdocs.
Once you're ready, get started below!