Nashville ADU Permits & Requirements
Fees $500–$5,000 · 4–10 weeks timeline · Up to 700–850 sf
Quick Answer
Nashville ADUs: $200K–$280K
Permits: $500–$5,000 · Updated April 2026
Permit Fees Breakdown
| Fee Type | Cost |
|---|---|
| Building Permit | $500–$3,500 |
| Plan Review | $200–$1,000 |
| Stormwater | $0–$500 |
| Utility Connections | $500–$2,000 |
Permit Process Timeline
Zone Verification
1–2 weeksConfirm lot is in USD RS zone eligible for DADUs
Plan Preparation
2–4 weeksArchitectural plans meeting Metro Nashville codes
Building Permit Review
4–6 weeksMetro review for building code compliance
Construction
4–7 monthsBuild phase with required inspections
Final Inspection & CO
1–2 weeksFinal inspection and Certificate of Occupancy
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Zoning & Requirements
Max ADU Size
700–850 sf
Height Limit
27 ft (ridge)
Setbacks
3 ft side/rear
Parking
1 off-street space
Key Regulations
- BL2025-1007 (2025) allows DADUs by-right in USD RS zones — Nashville's biggest ADU expansion
- Size: 700 sf max on lots under 10,000 sf; 850 sf max on larger lots
- Owner-occupancy required: one dwelling (primary or DADU) must be owner-occupied
- Short-term rentals (STR) BANNED in new DADUs on single-family lots
- Wind-rated construction (115 mph) is required — factor into material costs
- Eave height cannot exceed that of the principal house
Climate & Construction Notes
Nashville's tornado risk requires wind-rated construction (115 mph). Humid subtropical climate means dehumidification, mold-resistant materials, and good drainage are essential. Heavy rainfall requires robust stormwater management.
Frequently Asked Questions
How long does it take to get an ADU permit in Nashville?
The typical permit timeline is 4–10 weeks from application to approval. Total project time including design and construction is usually 6–12 months.
What types of ADUs are allowed in Nashville?
Nashville allows detached (independent, above garage). Maximum size is 700–850 sf with a height limit of 27 ft (ridge).
Do I need to live on the property to build an ADU in Nashville?
Yes (one dwelling must be owner-occupied). Check with Nashville's planning department for the most current requirements.
More Nashville ADU Resources
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