Nashville's New DADU Rules: What You Can Build in Your Backyard
Nashville just made detached backyard homes legal by-right across most of the city. Here's what that actually means for your lot, sizes, permits, cost, and the rental fine print, explained plainly by a local builder.
What changed in 2026
For years, building a second, standalone home in your backyard in Nashville meant clearing zoning hurdles, usually a special overlay and a public process that killed a lot of projects before they started. That changed. Recent Metro legislation (BL2025-1007) made detached accessory dwelling units (DADUs) permitted by-right across most residential zoning inside Nashville's Urban Services District (USD).
"By-right" is the important phrase. It means if your lot's base zoning allows it and you're in the USD, you can generally apply for a DADU permit directly, no special overlay, no rezoning gauntlet. The old alley-access requirement that disqualified many lots was also removed.
How big can you build?
Size is tied to your lot. Current Metro code caps the living space at 700 sq ft on lots under 10,000 sq ft, or 850 sq ft on lots of 10,000 sq ft or more, and it can never exceed the size of your main house. The DADU also has to stay subordinate to the main house, with eave-height limits around 10 feet for a single story and 17 feet for two stories (roof ridge under 27 feet).
Those are the general guardrails, the exact size your specific lot allows depends on its zoning, dimensions, and setbacks. That's the first thing we confirm at a consult, before anyone spends money on drawings.
Do you need permits? (Yes, and we handle them)
A DADU is a real dwelling, so it needs a permit, engineering, and Metro Codes sign-off like any home. The by-right change removed the zoning headache, not the building process. We manage the zoning confirmation, the DADU permit, engineering, and inspections from start to finish so you're not standing in line at Codes, in Davidson County and, for ADUs under each county's own rules, across Williamson, Wilson, Sumner, and the surrounding counties too.
What does a backyard home cost?
Every backyard home is custom, so there's no honest one-size price. Cost depends on size, finishes, site access, utility runs, and whether you're adding a pool or outdoor living at the same time. What we can promise is a transparent, itemized budget after a site walk, no vague "starting at" numbers that balloon later.
One thing that genuinely saves money: building the home, the pool, and the backyard as one project instead of hiring three contractors who don't coordinate. That's our whole approach.
Can you rent it out?
Many owners build a DADU specifically for long-term rental income, and that's allowed. The catch to know: short-term rental (Airbnb/VRBO) use is generally restricted for DADUs built under the new base-code allowance on single-family lots. If rental income is your goal, we'll walk you through exactly what your lot permits, including the rule that one of the two homes on the lot must be owner-occupied, so there are no surprises after it's built.
Is your lot a good candidate?
The best DADU lots tend to be in the inner-ring neighborhoods inside the USD, East Nashville, 12 South, Sylvan Park, The Nations, Green Hills, Hillsboro Village, where land values make the rental math work and older lots have room out back. But the only way to know for sure is to look at your lot.
Run the numbers: if rental income is the goal, our DADU rental-income ROI calculator shows estimated cash flow and payback in seconds.
Free download: our "Is your lot DADU-ready?" checklist, the 10 things that decide whether your lot qualifies.
Curious what your backyard can hold?
Free, no-pressure consult, we'll confirm what your lot allows and what it'll cost.
Call 615·863·1836This article is general information about Nashville's DADU rules as of June 2026, not legal or zoning advice. Codes and ordinances change, we confirm the current rules for your specific lot at consult.