ADUs are allowed in Unincorporated WillTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Will, IL
Is your property eligible for an ADU?
# of Properties
46,461
Owner-occupied
67%
Zoning districts
104
Avg Home Value
$122,274
Median Lot Size
0.43 acres
Avg Income
$107,263
Residential Types:
46,461 housing units
R
100%
Zoning Districts:
58,798 parcels · 104 districts
R-3
24%(14,213)
A-1
17%(10,231)
R-5
13%(7,671)
R-6-SUP
9%(5,265)
Other
36%(21,418)
ADU Rules
What can you build in Unincorporated Will, IL?
Unincorporated Will, 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 650 sq ft or 49% of the principal dwelling’s gross floor area (excluding attached garage), whichever is less.
Detached ADU Size Limits
- –Maximum detached ADU size is the lesser of 650 sq ft or 49% of the principal dwelling’s gross floor area (garage excluded).
- –With administrative adjustment approval, the detached ADU maximum may be increased by up to 10% above the standard cap.
Max Units
- –1 ADU per lot (detached or attached house).
- –0 ADUs on lots with an ECHO unit.
- –0 ADUs on nonconforming leasehold parcels.
Owner Occupancy
- –Owner must reside in principal or ADU for six months per year
Parking
- –0 spaces/ADU; no additional parking required; existing required parking for the house must be maintained or replaced on-site.
Rental Restrictions
- –Short-term rentals prohibited; tenancy must be month-to-month or longer
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.
Will County
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