ADUs are allowed in PlainfieldTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Plainfield, IN
Is your property eligible for an ADU?
# of Properties
2,566
Owner-occupied
49%
Zoning districts
29
Avg Home Value
$1,376,288
Median Lot Size
0.25 acres
Avg Income
$91,351
Residential Types:
2,566 housing units
Single Family
2%
2-3 Family
3%
Apts (4+ units)
92%
Other
2%
Zoning Districts:
14,447 parcels · 29 districts
PUD
39%(5,657)
R4
23%(3,350)
R2
13%(1,896)
R3
10%(1,512)
Other
14%(2,032)
ADU Rules
What can you build in Plainfield, IN?
Plainfield, IN follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum size is the lesser of 800 sq ft or 75% of the home’s finished floor area.
Detached ADU Size Limits
- –Maximum size is the lesser of 75% of the primary dwelling’s finished floor area or 800 sq ft.
Max Units
- –1 ADU per lot
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –No fixed min/max; parking set via Market Based Vehicle Parking (justify spaces; Plan Commission/Director may approve, require revisions, or land-bank; add spaces within 6 months if insufficient). In RF mixed‑use, ADU parking/garages must be alley-accessed and rear-located; front access not allowed.
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 Indiana municipalities
Rules change at the town line. Check the municipality your property is actually in.
Hendricks County