ADU rules for Ofallon
Accessory Dwelling Unit (ADU) Rules for Ofallon, IL
Is your property eligible for an ADU?
# of Properties
11,275
Owner-occupied
77%
Zoning districts
32
Avg Home Value
$102,605
Median Lot Size
0.27 acres
Avg Income
$119,795
Residential Types:
11,275 housing units
Other
100%
Zoning Districts:
12,682 parcels · 32 districts
SR-1
26%(3,285)
SR-3
18%(2,288)
SR-2
17%(2,218)
SR-1B
15%(1,953)
Other
23%(2,938)
ADU Rules
What can you build in Ofallon, IL?
Ofallon, 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
Parking
- –1 space/ADU for garage-conversion ADUs; otherwise no explicit minimum; unlisted uses follow the most similar listed use.
Rental Restrictions
- –Detached ADU cannot be established or rented at all.
- –Dwelling units may only be rented weekly, monthly or longer (no short-term rentals).
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.
St. Clair County