ADUs are allowed in Unincorporated OnslowTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Onslow, NC
Is your property eligible for an ADU?
# of Properties
53
Owner-occupied
53%
Zoning districts
55
Avg Home Value
$184,338
Median Lot Size
6.76 acres
Avg Income
$68,915
Residential Types:
53 housing units
Residential
100%
Zoning Districts:
67,299 parcels · 55 districts
RA
28%(18,780)
R-15
24%(16,410)
R-10
17%(11,329)
R-8M
12%(8,377)
Other
18%(12,403)
ADU Rules
What can you build in Unincorporated Onslow, NC?
Unincorporated Onslow, 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 limited to 60% of the principal dwelling’s heated floor area.
- –Maximum size capped at 900 sq ft in R-15 and R-20, or 1,200 sq ft in RA.
Detached ADU Size Limits
- –In R-15 and R-20, a detached ADU is limited to 60% of the principal dwelling’s heated floor area.
- –In R-15 and R-20, a detached ADU may not exceed 900 sq ft.
- –In RA, a detached ADU may not exceed 1,200 sq ft.
Max Units
- –1 ADU per single-family lot
- –Duplex/multifamily: none specified
Owner Occupancy
- –Owner-occupancy not required.
Parking
- –No ADU-specific parking; general rule is two spaces per dwelling; carports/garages may count with Zoning Administrator approval.
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.
Onslow County