ADUs are allowed in Chapel HillTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Chapel Hill, NC
Is your property eligible for an ADU?
# of Properties
1,282
Owner-occupied
70%
Zoning districts
50
Avg Home Value
$663,973
Median Lot Size
0.51 acres
Avg Income
$148,694
Residential Types:
1,282 housing units
Single Family
45%
Other
55%
Zoning Districts:
17,953 parcels · 50 districts
R-2
25%(4,474)
R-1
25%(4,463)
R-4
12%(2,149)
R-5-CZD
10%(1,722)
Other
29%(5,145)
ADU Rules
What can you build in Chapel Hill, NC?
Chapel Hill, 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 of 75% of the primary dwelling’s floor area if the primary is 1,300 sq ft or smaller, otherwise 1,000 sq ft; 750 sq ft in the Little Ridgefield NCD.
- –Alternative maximum of one-third of the primary dwelling’s floor area with Planning Director approval (within existing structure and on one floor); 750 sq ft in the Little Ridgefield NCD.
Detached ADU Size Limits
- –Maximum detached backyard cottage size limited to 1,000 sq ft (footprint) townwide; 750 sq ft in Little Ridgefield NCD; not permitted in TC-2 or Northside NCD.
Max Units
- –1 per lot for single-family with accessory apartment (attached or detached).
- –1 per lot for cottage (detached) (or per townhouse development).
- –0 per lot in Northside NCD (not permitted).
Parking
- –Min: 1 space per ADU bedroom; Cottage: no minimum stated. Max: ADU: none; Cottage: 1 space per bedroom. Exemptions: parking not required within Office/Institutional-3, Office/Institutional-4, or Historic Rogers Road districts; reductions/alternatives under Sec. 5.9.
Rental Restrictions
- –STRs must be fewer than 30 consecutive days and at least 18 hours. Cannot rent both the main dwelling and the ADU to separate parties. Multiple-unit STRs permitted only if the operator is onsite.
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