Everything homeowners ask about building an ADU in Nashville — answered with 2026 data.
Sometimes — but not by right. 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. Zoning: RS (single-family) with DADU overlay; R or RM zones with alley access or UDO; Urban Services District; General Services District with DADU overlay. Because approval is discretionary, confirm your own parcel with the planning department before budgeting. See our full Nashville ADU rules page.
ADU construction in Nashville typically costs $150,000-$250,000. The cost per square foot averages $225-$350. Garage conversions are more affordable at $100,000-$180,000, while prefab ADUs cost $80,000-$140,000. Permit fees add $2,500-$5,000 estimated (permit fees + covenant recording) to your budget. See our detailed Nashville ADU cost guide.
Detached ADUs in Nashville can be up to 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. Attached ADUs are limited to Limited; must be subordinate to primary dwelling. Junior ADUs (JADUs) have a cap of N/A (Nashville uses DADU terminology). Maximum height is Must be subordinate to primary dwelling; typically 1-2 stories. You are allowed up to 1 DADU per lot on a qualifying lot.
Rear setback: 5 ft minimum. Side setback: 5 ft minimum. Front setback: 10 ft minimum separation from primary dwelling (alley edge consideration). Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
Typically included on-site. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Required - owner must live in primary dwelling or DADU. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Nashville is typically 60-90 days typical; longer for Historic Overlay reviews. Plan check: 3-4 weeks typical. Pre-approved plans availability: City has DADU design standards and guidelines.
Average ADU rental income in Nashville: 1-bedroom units rent for $1,200-$1,700/month, 2-bedroom units for $1,600-$2,200/month. Short-term rentals: Restricted under restrictive covenants; long-term only. Expected ROI: 7-10 year payback; $100K+ supplemental income over 5 years.
The minimum lot size for an ADU in Nashville is 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. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Nashville, a garage conversion typically costs $100,000-$180,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
Tell us about your project and we'll connect you with ADU builders serving Nashville. Free, no obligation — you choose who to work with.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Just browsing? Search ADU builders near you by ZIP code.