ADUs are allowed in Oak ParkTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Oak Park, IL
Is your property eligible for an ADU?
# of Properties
17,384
Owner-occupied
57%
Zoning districts
18
Avg Home Value
$42,847
Median Lot Size
0.15 acres
Avg Income
$132,250
Residential Types:
17,384 housing units
Apts (4+ units)
2%
Other
98%
Zoning Districts:
18,598 parcels · 18 districts
R-7
26%(4,923)
R-4
21%(3,831)
R-2
15%(2,846)
R-3-50
11%(2,095)
Other
26%(4,903)
ADU Rules
What can you build in Oak Park, IL?
Oak Park, IL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Detached ADU Size Limits
- –Maximum livable area of a detached ADU is up to 1,000 sq ft and, on single-family lots, no larger than the primary dwelling.
Max Units
- –Single-family lots: 1 ADU per zoning lot (any ADU type). Two-family/multifamily lots: no ADUs authorized.
Owner Occupancy
- –Either the single-family dwelling or the accessory dwelling unit must be owner-occupied
Parking
- –0 spaces; max not stated; exceptions: no ADU parking requirement; coach house ADU must be above parking spaces in a detached garage (design/location, not a separate requirement).
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Illinois municipalities
Rules change at the town line. Check the municipality your property is actually in.
Cook County