ADU Rules: Chicago vs Orland Park
How do adu rules rules compare between Chicago, IL and Orland Park, IL?
Chicago has fewer restrictions than Orland Park.
Chicago, IL
Cook County
Chicago ADU Ordinance: permanent program effective April 1, 2026 citywide (with aldermanic opt-in for single-family RS zones). Pilot program active in 5 zones since 2021. Coach houses up to 1,200 sq ft.
View full Chicago rules →Orland Park, IL
Cook County
Orland Park's Land Development Code does not broadly permit accessory dwelling units (ADUs) in single-family residential districts. Multi-family and townhome zones permit multiple dwellings as the principal use. New ADUs in single-family neighborhoods are generally not permitted without a zoning variance. Unlike the City of Chicago, Orland Park has not adopted a broad ADU authorization ordinance.
View full Orland Park rules →Key Facts Comparison
| Fact | Chicago | Orland Park |
|---|---|---|
| Program | Permanent ordinance effective April 1, 2026 | - |
| Coverage | Citywide with aldermanic opt-in for RS zones | - |
| Pilot Zones | 5 zones pre-opted-in since 2021 | - |
| Max Size | 1,200 sq ft or 50% of primary dwelling | - |
| Height | 22 feet maximum | - |
| South/West/SW | 2 permits/block/year cap; owner-occupancy required | - |
| Single-Family Zone | - | ADU not permitted |
| Multi-Family Zones | - | Multi-unit by right |
| Variance Required | - | Discretionary process |
| Compare Chicago | - | Allows ADUs in pilot areas |
| HOAs | - | Typically prohibit |
Highlighted rows indicate differences between cities.
Chicago FAQ
Can I build an ADU on my property in Chicago?
Chicago ADU Ordinance: permanent program effective April 1, 2026 citywide (with aldermanic opt-in for single-family RS zones). Pilot program active in 5 zones since 2021. Coach houses up to 1,200 sq ft.
What are the size limits for an accessory dwelling unit in Chicago?
Program: Permanent ordinance effective April 1, 2026. Coverage: Citywide with aldermanic opt-in for RS zones. Pilot Zones: 5 zones pre-opted-in since 2021. Max Size: 1,200 sq ft or 50% of primary dwelling.
Orland Park FAQ
Can I build an ADU on my Orland Park property?
Generally no in single-family zones without a zoning variance. Multi-family zones permit multiple dwellings. Unlike the City of Chicago, Orland Park has not adopted a broad ADU authorization ordinance.
What about a basement apartment for a family member?
An independent second dwelling unit with its own cooking, sleeping, and bathroom facilities is not permitted in single-family zones. Shared family living within one household is allowed; a separately rented unit is not.
Could Orland Park adopt ADU rules in the future?
Possibly. State and regional housing policy discussions have raised ADU policy. Follow Village Board and Plan Commission agendas for any developments.
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