Nashville permits detached ADUs where a DADU overlay applies, or in R/RM zones with alley access under the UDO. It is not available on every single-family lot, so confirm the overlay applies to your parcel before budgeting.
Zoning & Size Requirements
Sometimes — Nashville allows ADUs, but not by right on a typical lot. A detached ADU generally requires a DADU overlay on the property's zoning, or alley access under the UDO — it is not available on every RS lot.
| 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.
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| 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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