ADUs are allowed in LisleTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Lisle, IL
Is your property eligible for an ADU?
# of Properties
7,181
Owner-occupied
78%
Zoning districts
13
Avg Home Value
$145,943
Median Lot Size
0.26 acres
Avg Income
$130,102
Residential Types:
7,181 housing units
Residential
100%
Zoning Districts:
8,024 parcels · 13 districts
R-2
62%(4,959)
R-4
20%(1,573)
R-1
6%(476)
R-3
4%(285)
Other
9%(731)
ADU Rules
What can you build in Lisle, IL?
Lisle, 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: Not permitted
Owner Occupancy
- –Owner must occupy the principal or accessory dwelling unit
Parking
- –2 off-street spaces per added ADU; no max stated; exceptions: only the additional spaces are required and must be on the same lot; general residential parking rules apply, guest parking only for duplex/townhouse/multi-unit, not detached houses.
Rental Restrictions
- –Short-term rentals prohibited; rentals must be month-to-month or longer; ADU occupants must be related to the primary-unit occupants; at least one unit must be occupied by a person 55+ or with a qualifying disability.
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