ADU rules for Darien
Accessory Dwelling Unit (ADU) Rules for Darien, IL
Is your property eligible for an ADU?
# of Properties
8,479
Owner-occupied
86%
Zoning districts
11
Avg Home Value
$142,327
Median Lot Size
0.26 acres
Avg Income
$112,588
Residential Types:
8,479 housing units
Residential
100%
Zoning Districts:
8,848 parcels · 11 districts
R-2
55%(4,845)
R-3
38%(3,319)
R-1
6%(494)
B-2
1%(66)
Other
1%(124)
ADU Rules
What can you build in Darien, IL?
Darien, IL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Not addressed in the local bylaw
- –Detached ADU: Not addressed in the local bylaw
Max Units
- –Single-family (R-1): 0 ADU per lot (prohibited).
- –Two-family/duplex (R-2): 0 ADU per lot (prohibited).
- –Multifamily (R-3): 0 ADU per lot (prohibited).
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –No ADU parking requirement; ADUs prohibited in residence districts (no dwelling in accessory buildings). If an unlisted use is permitted, parking is set by the ZEO based on a similar listed use.
Rental Restrictions
- –Detached ADU cannot be rented; dwelling use not permitted in residence districts.
- –Short-term rentals prohibited citywide; no ADU may be rented for fewer than 30 days.
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.
DuPage County