ADUs are allowed in Unincorporated LaSalleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated LaSalle, IL
Is your property eligible for an ADU?
# of Properties
12,988
Owner-occupied
75%
Zoning districts
38
Median Lot Size
0.62 acres
Avg Income
$90,944
Residential Types:
12,988 housing units
Residential
100%
Zoning Districts:
27,656 parcels · 38 districts
A-1
65%(17,850)
R-R
21%(5,821)
A-C
6%(1,749)
R-2
5%(1,494)
Other
3%(742)
ADU Rules
What can you build in Unincorporated LaSalle, IL?
Unincorporated LaSalle, 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: Special Permit
Interior / Attached ADU Size Limits
- –Maximum ADU footprint of 900 sq ft
- –ADU must be smaller than the principal dwelling
Detached ADU Size Limits
- –Maximum detached ADU footprint of 900 square feet.
- –Detached ADU size may not exceed the size of the principal residence.
Owner Occupancy
- –Owner must occupy either the principal dwelling or the ADU.
Parking
- –2 spaces per ADU (in addition to principal); generally on the same lot, with limited allowance for an alternative/contiguous lot location.
Rental Restrictions
- –Cannot rent both units simultaneously; owner-occupancy required.
- –Detached ADU cannot be rented as a bed-and-breakfast/short-term stay.
- –Internal/attached ADU cannot be used as B&B guestrooms (no kitchen facilities for B&Bs).
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.
LaSalle County
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