ADU Rules: Arlington Heights vs Skokie
How do adu rules rules compare between Arlington Heights, IL and Skokie, IL?
Arlington Heights and Skokie have similar restriction levels.
Arlington Heights, IL
Cook County
Arlington Heights does not currently permit accessory dwelling units (ADUs) as a by-right use in most residential zoning districts. The Village's zoning ordinance generally limits residential lots to one principal dwelling. Coach houses or secondary units may be possible through a special use permit or planned development process, but approval is not guaranteed and requires public hearings.
View full Arlington Heights 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 | Arlington Heights | Skokie |
|---|---|---|
| ADUs Permitted | Not by right in most zones | - |
| Special Use Permit | Required for secondary units | - |
| State ADU Mandate | Illinois has none | - |
| Accessory Living Space | Allowed without separate kitchen/entrance | - |
| Public Hearing | Required for zoning relief | - |
| 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.
Arlington Heights FAQ
Can I build a granny flat or ADU in Arlington Heights?
Not as a by-right use. ADUs are not permitted in most residential districts. You would need to apply for a special use permit or planned development amendment, which requires Village Board approval after public hearings.
Can I finish my basement as a living space?
You can create a finished basement living area, but it cannot function as a separate dwelling unit with its own kitchen, separate entrance, and address. It must remain part of the single-family dwelling and meet building code requirements for egress and ceiling height.
Does Illinois require cities to allow ADUs?
No. Illinois does not have a statewide ADU mandate. Each municipality sets its own zoning rules regarding accessory dwelling units. Arlington Heights has not adopted ADU-enabling legislation.
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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