Garage Conversions: Chicago vs Orland Park
How do garage conversions rules compare between Chicago, IL and Orland Park, IL?
Chicago has fewer restrictions than Orland Park.
Chicago, IL
Cook County
Chicago authorizes garage conversions to coach houses (detached ADUs) and conversion units (attic/basement ADUs) under the Additional Dwelling Unit Ordinance. The pilot ordinance (effective May 2021) was made permanent and city-wide by Ordinance SO2024-0008918, which the City Council passed 46-0 on September 25, 2025, with permits accepted starting April 1, 2026. ADUs are now allowed in single-family zones within the original pilot areas plus all multifamily zones citywide (except downtown).
View full Chicago rules →Orland Park, IL
Cook County
Converting a garage into living space in Orland Park requires a building permit and must comply with zoning rules including minimum off-street parking requirements. Because single-family zoning requires a minimum number of off-street parking spaces and generally does not permit a second dwelling unit, full garage conversions are difficult to permit without providing replacement parking.
View full Orland Park rules →Key Facts Comparison
| Fact | Chicago | Orland Park |
|---|---|---|
| Ordinance | SO2024-0008918 (passed 9/25/2025) | - |
| Effective Citywide | April 1, 2026 | - |
| Coach House Height | 22 ft max; rear 50% of lot | - |
| Parking | No additional spaces required | - |
| Labor Standard | Reg. Apprenticeship Program (coach houses) | - |
| Permit | - | Required |
| Off-Street Parking | - | Must still meet zoning minimum |
| Enclosed Space | - | At least one space typical |
| Ceiling Height | - | 7 ft minimum |
| Separate Unit | - | Generally prohibited |
Highlighted rows indicate differences between cities.
Chicago FAQ
Can I legally convert my Chicago garage to a coach house?
Yes, in eligible zones. As of April 1, 2026, Chicago's permanent Additional Dwelling Unit Ordinance (SO2024-0008918) allows coach houses citywide in single-family zones within the original pilot areas plus all multifamily zones (except downtown), with a 22-foot height limit in the rear 50% of the lot.
Do I need a permit to remodel or convert my Chicago garage to living space?
Yes. The Chicago Department of Buildings requires a building permit for any change of use from garage to habitable space, with plan review under Title 14X (Chicago Building Code). For ADU/coach house conversions, a pre-certification from the Department of Housing is required first.
Do I need additional parking after converting my Chicago garage?
No. The Additional Dwelling Unit Ordinance does not require additional off-street parking when adding an ADU, even when the conversion eliminates an existing garage.
Orland Park FAQ
Can I convert my garage in Orland Park?
You can, with a building permit, if you can still provide the required off-street parking and meet habitability codes. Converting to a rented separate unit is generally not allowed in single-family zones.
What if I still have enough driveway parking?
Zoning typically requires at least one enclosed space. Losing the garage without replacing enclosed parking generally requires a zoning variance from the Village Board.
What building code issues matter most?
Egress windows in sleeping rooms, minimum 7-foot ceilings, adequate heating, smoke and CO detectors, insulation meeting IL Energy Code, and moisture management on the slab floor.
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