ADU rules for Unincorporated Williamson
Accessory Dwelling Unit (ADU) Rules for Unincorporated Williamson, IL
Is your property eligible for an ADU?
# of Properties
13,264
Owner-occupied
56%
Zoning districts
15
Avg Home Value
$27,092
Median Lot Size
0.74 acres
Avg Income
$81,175
Residential Types:
13,264 housing units
Single Family
6%
Other
94%
Zoning Districts:
21,409 parcels · 15 districts
NZ
98%(21,046)
R-A
0%(90)
R-1
0%(83)
I
0%(82)
Other
1%(108)
ADU Rules
What can you build in Unincorporated Williamson, IL?
Unincorporated Williamson, 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
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.
Williamson County