Nashville allows Detached Accessory Dwelling Units (DADUs) in specific overlay districts and certain zoning districts. Owner occupancy required. Unit must be subordinate to primary dwelling. Strong rental market with growing demand.
Zoning & Size Requirements
Yes, you can build an ADU in Nashville. A detached ADU can be up to the city's size limit under current Tennessee and Nashville zoning rules.
| Allowed Zones | RS (single-family) with DADU overlay; R or RM zones with alley access or UDO; Urban Services District; General Services District with DADU overlay |
| Max Size (Detached) | 850 sq ft on lots under 10,000 sq ft; 1,200 sq ft on lots 10,000 sq ft or larger; and no larger than the size or footprint of the principal structure |
| Max Size (Attached) | Limited; must be subordinate to primary dwelling |
| Max Size (JADU) | N/A (Nashville uses DADU terminology) |
| Max Height | Must be subordinate to primary dwelling; typically 1-2 stories |
| Max Units | 1 DADU per lot (with conditions) |
Setback Requirements
Nashville requires a rear setback of about 5 ft for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is required.
| Rear Setback | 5 ft minimum |
| Side Setback | 5 ft minimum |
| Front Setback | 10 ft minimum separation from primary dwelling (alley edge consideration) |
| Parking Required | Typically included on-site |
| Owner Occupancy | Required - owner must live in primary dwelling or DADU |
| Min Lot Size | No minimum lot size (the prior 15,000 sq ft minimum was removed by BL2025-1007); 10,000 sq ft is only the threshold for the size cap, not a qualifying minimum |
Permit Process & Fees
An ADU permit in Nashville typically costs $2,500-$5,000 estimated (permit fees + covenant recording) and takes 60-90 days typical; longer for Historic Overlay reviews, through a standard permit review.
| Approval Process | Requires contractor permit pull (not self-permit allowed). Restrictive covenant required for Historic Overlays. ePermits system available. |
| Review Timeline | 60-90 days typical; longer for Historic Overlay reviews |
| Permit Fees | $2,500-$5,000 estimated (permit fees + covenant recording) |
| Impact Fees | School impact fees may apply |
| Plan Check | 3-4 weeks typical |
| Pre-Approved Plans | City has DADU design standards and guidelines |
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Construction Costs
Building an ADU in Nashville typically costs $150,000-$250,000 ($225-$350 per sq ft); a garage conversion runs $100,000-$180,000.
| Average Build Cost | $150,000-$250,000 |
| Cost per Sq Ft | $225-$350 |
| Garage Conversion | $100,000-$180,000 |
| Prefab ADU (Installed) | $80,000-$140,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential
A 2-bedroom ADU in Nashville rents for around $1,600-$2,200, an estimated 7-10 year payback; $100K+ supplemental income over 5 years.
| Avg Rent (1 Bedroom) | $1,200-$1,700 |
| Avg Rent (2 Bedroom) | $1,600-$2,200 |
| Short-Term Rental | Restricted under restrictive covenants; long-term only |
| Est. Annual ROI | 7-10 year payback; $100K+ supplemental income over 5 years |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- BL2025-1007 (effective Dec 12, 2025): DADUs are permitted by-right in RS zones within the Urban Services District (and where a DADU overlay applies in the General Services District); the alley-access requirement was removed
- Alley access requirement removed; size limits increased to 850 sq ft (<10K lots) or 1,200 sq ft (larger lots)
- Short-term rental prohibition for DADUs built under new base code allowance on RS lots
- DADU Overlay can now be applied in the General Services District
Tips for Building an ADU in Nashville
- Check if property is in DADU overlay district (required for RS zones)
- Owner occupancy requirement is non-negotiable
- Restrictive covenant required; record at register's office
- Contractor must pull permit; cannot be self-permitted
- Strong rental market; high occupancy rates in Nashville
ADU Builders in Nashville
Looking for an ADU builder in Nashville? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Nashville homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
Sources for Nashville ADU data are being compiled. Our data is researched from official city planning documents and municipal codes. Learn about our methodology.
Frequently Asked Questions
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