What type of property do you own in Chicago?
Is your property in the downtown core — the Loop, River North, Streeterville, or nearby?
Downtown zoning (DX, DC, DS districts) is excluded from the ADU program. Most residential neighborhoods outside the core are eligible.
Does your property already have a coach house, basement apartment, or garage conversion?
Properties with existing unpermitted units may still qualify — but the path involves permitting the existing unit rather than building new. Worth knowing before you plan.
Do you know if your ward has opted into the ADU program?
Chicago has 50 wards. The ADU program is citywide as of April 2026, but individual aldermen can limit the number of new ADUs built per block per year.
Based on your answers, your home is exactly the type of residential property the April 2026 citywide ADU ordinance was designed for. Coach houses, basement conversions, and garage apartments are now legal in most residential zones across Chicago.
The next step is confirming your specific ward's rules — some aldermen have adjusted the annual build cap in their area. A quick conversation can tell you exactly what your property allows and what the income potential looks like.
The Chicago ADU ordinance covers most of the city, but individual aldermen control how many ADUs can be built per block per year in their ward. A few wards have not fully opted in.
The Chicago Cityscape ADU map is the fastest way to check your specific address. Or reach out directly — ward-by-ward ADU rules are exactly what a local Chicago agent should know.
Condos, co-ops, and commercial buildings generally fall outside the Chicago ADU program, which is designed for residential lots with ground-level or detached structures.
Rules are always evolving and there may be options worth discussing — especially if you own a mixed-use building with a residential component. A quick conversation is the fastest way to find out.