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
42,362
Owner-occupied
67%
Zoning districts
90
Avg Home Value
$116,913
Median Lot Size
0.39 acres
Avg Income
$105,831
Residential Types:
42,362 housing units
R
100%
Zoning Districts:
54,958 parcels · 90 districts
R-3
23%(12,891)
A-1
16%(9,067)
R-5
13%(7,274)
R-6-SUP
10%(5,271)
Other
37%(20,455)
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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
Is your property eligible for an ADU?
ADU rules in other Illinois municipalities
Rules change at the town line. Check the municipality your property is actually in.
Will County
Browse addresses by ZIP in Unincorporated Will
605445,480 addresses604234,675 addresses604333,514 addresses604413,028 addresses604512,866 addresses604172,828 addresses604812,265 addresses604491,912 addresses605851,912 addresses604011,900 addresses604481,642 addresses604321,155 addresses604421,071 addresses604351,021 addresses605861,017 addresses60468900 addresses60431763 addresses60404611 addresses60421541 addresses60491527 addresses60564503 addresses60436439 addresses60446275 addresses