ADUs are allowed in NorthbrookTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Northbrook, IL
Is your property eligible for an ADU?
# of Properties
13,647
Owner-occupied
80%
Zoning districts
30
Avg Home Value
$73,440
Median Lot Size
0.28 acres
Avg Income
$167,283
Residential Types:
13,647 housing units
Other
100%
Zoning Districts:
14,963 parcels · 30 districts
R4
38%(5,618)
R5
18%(2,641)
R8
15%(2,308)
R6
7%(1,034)
Other
22%(3,362)
ADU Rules
What can you build in Northbrook, IL?
Northbrook, 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 addressed in the local bylaw
Interior / Attached ADU Size Limits
- –Maximum size of 600 sq ft for an internal/attached accessory dwelling unit.
- –Maximum size of 25% of the principal dwelling’s total floor area for an internal/attached accessory dwelling unit.
Max Units
- –1 AADU per zoning lot (only by special permit in Single Family Residential Districts)
Owner Occupancy
- –Owner must occupy the principal residence for six months yearly.
Parking
- –No min/max parking specified; all overnight AADU parking must be on the same zoning lot on an improved hard surface; overnight street parking may not be used by AADU residents.
Rental Restrictions
- –Short-term rentals of ADUs are prohibited.
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