Durham allows ADUs in residential zones with reasonable regulations. The city's growth as part of the Research Triangle and strong housing demand make it an attractive ADU market.
Zoning & Size Requirements
| Allowed Zones | Single-family residential zones |
| Max Size (Detached) | 850 sq ft |
| Max Size (Attached) | 750 sq ft |
| Max Size (JADU) | Not allowed |
| Max Height | 35 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 15 feet |
| Side Setback | 5 feet |
| Front Setback | 20 feet |
| Parking Required | 1 space per unit |
| Owner Occupancy | Not required |
| Min Lot Size | 5,000 sq ft |
Permit Process & Fees
| Approval Process | Building permit |
| Review Timeline | 55-75 days |
| Permit Fees | $2,300-$3,900 |
| Impact Fees | $800-$1,500 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Limited availability |
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Construction Costs
| Average Build Cost | $120,000-$240,000 |
| Cost per Sq Ft | $140-$280 |
| Garage Conversion | $60,000-$140,000 |
| Prefab ADU (Installed) | $85,000-$190,000 (installed) |
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Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| Avg Rent (1 Bedroom) | $1,300-$1,750/mo |
| Avg Rent (2 Bedroom) | $1,650-$2,300/mo |
| Short-Term Rental | Varies by zone |
| Est. Annual ROI | 7-10% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Expanded ADU allowance in all residential zones
- 2023: Streamlined permitting process
- 2024: Increased max sizes for both detached and attached ADUs
- 2023: Created ADU design guidelines
Tips for Building an ADU in Durham
- Durham offers best balance of growth and affordability in Research Triangle
- Revitalization efforts support long-term appreciation
- Duke University and medical institutions provide stable tenant base
- Strong rental market with good cash flow potential
Frequently Asked Questions
Can I build an ADU in Durham?
Yes. ADUs are allowed in Single-family residential zones in Durham. The maximum size for a detached ADU is 850 sq ft. No owner-occupancy is required.
How much does an ADU cost in Durham?
ADU construction in Durham typically costs $120,000-$240,000. Garage conversions run $60,000-$140,000, and prefab ADUs cost $85,000-$190,000 (installed).
How much can I rent an ADU for in Durham?
Average ADU rents in Durham are $1,300-$1,750/mo for a 1-bedroom and $1,650-$2,300/mo for a 2-bedroom unit.
Do I need parking for an ADU in Durham?
1 space per unit. Check with Durham planning department for the latest North Carolina ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Durham?
The permit review timeline in Durham is 55-75 days. Fees range from $2,300-$3,900.
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