An ADU builder in Nashville is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Nashville's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Tennessee.
What ADU Builders Cost in Nashville
Based on our Nashville cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $150,000-$250,000 |
| Cost per Sq Ft | $225-$350 |
| Garage Conversion | $100,000-$180,000 |
| Prefab / Modular ADU (installed) | $80,000-$140,000 |
| City Permit & Plan Review | $2,500-$5,000 estimated (permit fees + covenant recording) |
| Impact Fees | School impact fees may apply |
For a full line-item breakdown, see our Nashville ADU cost guide. To confirm what you're allowed to build before you hire, review the Nashville ADU rules (max detached size: 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; owner-occupancy: Required - owner must live in primary dwelling or DADU).
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How to Vet an ADU Builder in Nashville
- License: Confirm a current contractor's license in Tennessee and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Nashville and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits ($2,500-$5,000 estimated (permit fees + covenant recording)), plan check (3-4 weeks typical), and impact fees (School impact fees may apply) are included.
- Permit handling: Confirm they manage Nashville's permit process ("Requires contractor permit pull (not self-permit allowed). Restrictive covenant required for Historic Overlays. ePermits system available.", typically 60-90 days typical; longer for Historic Overlay reviews) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Nashville in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (60-90 days typical; longer for Historic Overlay reviews) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent Tennessee ADU client references?
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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