ADUs are allowed in WestmontTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Westmont, IL
Is your property eligible for an ADU?
# of Properties
6,854
Owner-occupied
75%
Zoning districts
16
Avg Home Value
$137,995
Median Lot Size
0.21 acres
Avg Income
$106,304
Residential Types:
6,854 housing units
Residential
100%
Zoning Districts:
7,631 parcels · 16 districts
R-3
58%(4,442)
R-4
26%(1,966)
R-5
6%(432)
B-2
3%(256)
Other
7%(535)
ADU Rules
What can you build in Westmont, IL?
Westmont, 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
Interior / Attached ADU Size Limits
- –Maximum size of 850 sq ft
- –Maximum size equal to the floor area of the principal dwelling unit
Detached ADU Size Limits
- –Maximum detached ADU size is the lesser of 850 sq ft or the principal dwelling unit’s floor area.
Max Units
- –1 ADU per lot (detached-house on an R-zoned lot); ADUs not allowed on other lots
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –0 spaces per ADU; max not specified; no additional ADU parking required; principal dwelling parking must be maintained or replaced on-site.
Rental Restrictions
- –Short-term rentals prohibited; only month-to-month or longer leases allowed.
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