ADUs are allowed in HillsboroughTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Hillsborough, NC
Is your property eligible for an ADU?
# of Parcels
4,435
Zoning districts
24
Avg Parcel Value
$584,490
Zoning Districts:
4,476 parcels · 24 districts
R10
30%(1,324)
ESU
18%(795)
R20
16%(718)
R15
12%(547)
Other
24%(1,092)
ADU Rules
What can you build in Hillsborough, NC?
Hillsborough, NC 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 greater of 50% of the principal dwelling’s gross floor area or 1,000 sq ft, but cannot exceed the principal dwelling’s gross floor area.
Detached ADU Size Limits
- –Maximum size is the greater of 1,000 sq ft or 50% of the principal dwelling's gross floor area, but not more than the principal dwelling's gross floor area.
Max Units
- –1 ADU per single-family lot; duplex/multifamily: none specified; freestanding ADUs allowed only in R-10, R-15, R-20
Parking
- –2 spaces for the principal dwelling + 1 space per ADU bedroom; maximum equals minimum. On-parcel, off-street parking required (garage allowed); off-site/shared parking not permitted for ADUs.
Rental Restrictions
- –Short-term rentals require a home occupation permit; lodging/overnight use only; no public events; operator must reside on the premises; stays under 30 days.
ADU State Law
What can you build in North Carolina?
- –North Carolina does not have a statewide ADU mandate; ADU rules are set by individual municipalities.
- –Building/fire codes are set statewide, but whether an ADU is allowed is local zoning.
- –There is active proposed legislation (H627 / S495, "Regulation of Accessory Dwelling Units") that would create G.S. 160D-917 and require local governments to allow at least one ADU in certain single-family areas, but it is not enacted.
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 North Carolina municipalities
Rules change at the town line. Check the municipality your property is actually in.
Orange County