ADUs are allowed in Unincorporated JeffersonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Jefferson, IN
Is your property eligible for an ADU?
# of Properties
7,847
Owner-occupied
41%
Zoning districts
19
Avg Home Value
$101,810
Median Lot Size
7.73 acres
Avg Income
$72,378
Residential Types:
7,847 housing units
Single Family
33%
Apts (4+ units)
33%
Other
34%
Zoning Districts:
13,060 parcels · 19 districts
AG
69%(8,980)
R-4
7%(933)
RA
6%(830)
R-A
6%(814)
Other
12%(1,503)
ADU Rules
What can you build in Unincorporated Jefferson, IN?
Unincorporated Jefferson, IN follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Special Permit
- –Detached ADU: Special Permit
Interior / Attached ADU Size Limits
- –Maximum internal ADU size is 800 sq ft or 50% of the primary dwelling’s floor area, whichever is less.
Detached ADU Size Limits
- –Maximum detached ADU size of 800 sq ft
- –Maximum detached ADU size of 50% of the primary dwelling’s floor area
- –In R1–R3, detached ADU limited to 75% of the primary home’s floor area (accessory-structure cap)
Max Units
- –1 ADU per parcel (single-family lots; attached or detached).
- –Two-family (duplex) and multifamily lots: ADUs not permitted.
Owner Occupancy
- –ADU allowed only if the primary dwelling is owner-occupied
Parking
- –1 on-site space per ADU; may be shared with the primary dwelling unit; must use the existing driveway serving the primary dwelling; no separate driveway from the public right-of-way
Rental Restrictions
- –Short-term rentals are prohibited for ADUs; no stated minimum/maximum long-term lease terms.
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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