ADU Rules: Chicago vs Skokie
How do adu rules rules compare between Chicago, IL and Skokie, IL?
Chicago has fewer restrictions than Skokie.
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 →Skokie, IL
Cook County
Skokie's zoning code does not broadly permit accessory dwelling units (ADUs) in single-family residential districts. Two-flat and multi-family zones permit multiple dwellings by right. Some legacy in-law arrangements exist but new ADUs are generally not permitted without a zoning variance. The Village has studied ADU policy but has not adopted a broad authorization ordinance as of the most recent code updates.
View full Skokie rules →Key Facts Comparison
| Fact | Chicago | Skokie |
|---|---|---|
| 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 |
| Two-Flat Zones | - | Multi-unit by right |
| Variance Required | - | ZBA discretionary process |
| Compare Evanston | - | Allows ADUs |
| Compare Chicago | - | Allows ADUs in pilot areas |
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.
Skokie FAQ
Can I build an ADU on my Skokie property?
Generally no in single-family zones without a zoning variance. Two-flat and multi-family zones permit multiple dwellings. Unlike Evanston and Chicago, Skokie 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 Skokie adopt ADU rules in the future?
Possibly. The Plan Commission has discussed ADU policy in the context of housing needs. Follow Village Board agendas and Plan Commission notices for developments.
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