ADUs are allowed in NapervilleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Naperville, IL
Is your property eligible for an ADU?
# of Properties
49,578
Owner-occupied
82%
Zoning districts
65
Avg Home Value
$423,829
Median Lot Size
0.25 acres
Avg Income
$165,798
Residential Types:
49,578 housing units
Residential
100%
Zoning Districts:
52,732 parcels · 65 districts
R1A
36%(18,849)
R1A-PUD
12%(6,195)
R1B-PUD
8%(4,410)
R1B
7%(3,848)
Other
37%(19,430)
ADU Rules
What can you build in Naperville, IL?
Naperville, IL follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: Conditional Use Permit
Detached ADU Size Limits
- –Detached ADUs are not allowed; maximum permitted area is 0 sq ft.
Max Units
- –1 per lot for Residential Care Unit on single-family detached lots (may be attached to the principal dwelling).
- –Detached stand-alone Residential Care Unit: 0 per lot (prohibited).
Owner Occupancy
- –Owner must occupy a dwelling unit on the lot
Parking
- –1 space per bedroom in the ADU; no max; subject to Sec. 6-9-2 Off-Street Parking Facilities; RCUs allowed by conditional use; no transit-based waivers.
Rental Restrictions
- –Bed-and-breakfast/short-term rentals prohibited in residential zones (attached ADU).
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