ADUs are allowed in WilmetteTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Wilmette, IL
Is your property eligible for an ADU?
# of Properties
10,351
Owner-occupied
76%
Zoning districts
23
Avg Home Value
$98,862
Median Lot Size
0.20 acres
Avg Income
$199,025
Residential Types:
10,351 housing units
Other
100%
Zoning Districts:
10,947 parcels · 23 districts
R1-A
25%(2,731)
R1-D
19%(2,064)
R1-H
11%(1,199)
R2
9%(944)
Other
37%(4,009)
ADU Rules
What can you build in Wilmette, IL?
Wilmette, IL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Special Permit
- –Detached ADU: Not permitted
Interior / Attached ADU Size Limits
- –Maximum size is 25% of the total area of the principal structure for an internal accessory dwelling unit.
Max Units
- –1 per lot for detached single-family dwelling (internal/attached only).
- –Detached ADU: 0; Duplex: 0; Multifamily: 0.
- –JADU: none specified.
Owner Occupancy
- –Owner must occupy either dwelling as principal residence six months per year.
Parking
- –1 space per ADU (off-street); maximums by lot size: 4 (<15,000 sq ft), 6 (15,000–19,999), 8 (20,000–29,999), 10 (≥30,000). Parking must be on the same lot; for new single-family dwellings spaces must be enclosed.
Rental Restrictions
- –Detached ADUs prohibited; cannot be established or rented
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.
Cook County