Zoning & Size Limits
| Requirement | Raleigh, NC | Durham, NC |
|---|
| Allowed Zones | Single-family residential | Single-family residential zones |
| Max Size (Detached) | 800 sq ft | 850 sq ft |
| Max Size (Attached) | 700 sq ft | 750 sq ft |
| Max Height | 35 feet | 20 ft (detached, outside setbacks); 15 ft (within |
| Parking Required | No additional parking required | 1 space per unit |
| Owner Occupancy | Not required | Not required |
Setback Requirements
| Setback | Raleigh, NC | Durham, NC |
|---|
| Rear Setback | 15 feet | 15 feet |
| Side Setback | 5 feet | 5 feet |
| Front Setback | 20 feet | 20 feet |
Permits & Timeline
| Detail | Raleigh, NC | Durham, NC |
|---|
| Permit Timeline | 50-70 days | 55-75 days |
| Permit Fees | $2,100-$3,600 | $2,300-$3,900 |
| Impact Fees | $700-$1,300 | $800-$1,500 |
| Pre-Approved Plans | Limited availability | Limited availability |
Construction Costs
| Cost | Raleigh, NC | Durham, NC |
|---|
| Avg Build Cost | $110,000-$220,000 | $120,000-$240,000 |
| Cost Per Sq Ft | $135-$275 | $140-$280 |
| Garage Conversion | $55,000-$130,000 | $60,000-$140,000 |
| Prefab ADU | $80,000-$180,000 | $85,000-$190,000 |
Rental Income Potential
| Rental | Raleigh, NC | Durham, NC |
|---|
| 1BR Avg Rent | $1,200-$1,650/mo | $1,300-$1,750/mo |
| 2BR Avg Rent | $1,550-$2,150/mo | $1,650-$2,300/mo |
| Short-Term Rentals | Not typically permitted | Varies by zone |
| Est. ROI | 7-10% annual return | 7-10% annual return |
Which City Is Better for ADUs?
Raleigh scores 6/10 while Durham scores 6/10 on our ADU-friendliness index.
Both cities offer viable ADU development opportunities — the best choice depends on your specific property, budget, and goals.
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