ADUs are allowed in Unincorporated DuPageTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated DuPage, IL
Is your property eligible for an ADU?
# of Properties
37,719
Owner-occupied
69%
Zoning districts
66
Avg Home Value
$137,940
Median Lot Size
0.40 acres
Avg Income
$123,731
Residential Types:
37,719 housing units
Residential
100%
Zoning Districts:
41,147 parcels · 66 districts
R-4
48%(19,805)
R-3
24%(9,921)
R-6
6%(2,617)
R-2
6%(2,438)
Other
15%(6,366)
ADU Rules
What can you build in Unincorporated DuPage, IL?
Unincorporated DuPage, IL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: Conditional Use Permit
Interior / Attached ADU Size Limits
- –Maximum size of 1,000 sq ft of total floor area for an internal or attached ADU
Detached ADU Size Limits
- –Maximum size of 1,000 sq ft for a detached accessory dwelling unit
- –A detached ADU may not be larger than the principal building’s gross floor area
Max Units
- –1 ADU per single-family lot
Owner Occupancy
- –One occupant must be the property owner.
Parking
- –2 off-street spaces per ADU; no ADU-specific max; property cap 6 total vehicles (principal + ADU); exceptions: if one required space is in a garage, the other may be in the driveway (front-yard intrusion allowed); if none in a garage, spaces may not be in required front or side yards.
Rental Restrictions
- –Six-month minimum rental term; short-term rentals (<6 months) prohibited.
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.
DuPage County
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