Accessory Structures in Nashville, TN

If you live in Nashville or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Nashville has 6 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

ADU Rules

Metro requires detached ADUs be owner-occupied and capped at 700-850 square feet by lot size, permitted only in the Urban Services District, a DADU overlay in the General Services District, or via Specific Plan; a recorded covenant precedes permit issuance.

Key details: Size cap: 700-850 sq ft by lot size. Occupancy: Owner must live in one unit. Location: USD, DADU overlay, or Specific Plan only. Before permit: Recorded covenant required. Units per lot: One DADU maximum.

Building or occupying a DADU without a zoning permit lets the zoning administrator triple the permit fee, and any zoning violation carries a $500-per-day civil penalty plus misdemeanor exposure under Metro Code §§ 17.40.610-.620.

This is one of the stricter rules in Nashville's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Shed & Carport Rules

Metro Nashville caps rear-yard accessory buildings under 40,000-square-foot lots at 850 square feet (or half the house's footprint, whichever is larger) and never more than 2,500 square feet, with reduced side and rear setbacks for small sheds.

Key details: Max coverage (lot <40,000 sf): 850 sq ft or 50% of house, greater. Absolute cap, any lot size: 2,500 square feet. Height limit (lot <40,000 sf): 1 story or 16 feet. Side setback (shed ≤850 sf): Half district setback, min 3 feet. Rear setback: 3 feet (10 feet if alley-facing).

Accessory structures that exceed the 850/2,500-square-foot coverage cap, the 16-foot one-story height limit, or the reduced side/rear setbacks violate the zoning code; the zoning administrator can require correction or removal before a building permit is approved.

ADU Owner Occupancy

Metro Nashville limits each lot to one detached accessory dwelling unit, requires it to share ownership with the principal house, and mandates that one of the two dwellings be owner-occupied before a permit issues.

Key details: Ownership: ADU and house share one owner. Occupancy: One dwelling must be owner-occupied. Max units: One detached ADU per lot. Location: USD or approved DADU overlay only. Citation: Metro Code Section 17.16.030(G)(3).

Zoning administrator denies or revokes the permit if ownership splits or the covenant lapses; code enforcement can cite unpermitted ADU use, and title problems surface at sale since the covenant runs with the land.

ADU Rental Restrictions

Metro Nashville bars newly built or converted detached accessory dwelling units on single-family, RN-, or RL-zoned lots from operating as owner-occupied short-term rentals under the zoning code's ADU standards.

Key details: Rule: New DADUs can't be owner-occupied STRs. Applies to: Single-family, RN, and RL-zoned lots. Ownership: DADU must share owner with main house. Grandfathered: STR permits active before Aug. 1, 2024. Citation: Metro Code § 17.16.030(G)(12).

Building without a permit, using a disqualified DADU as an owner-occupied short-term rental, or leasing the unit separately from the main house voids eligibility and can trigger a zoning code violation and permit denial or revocation by the zoning administrator.

Compared to other cities, Nashville takes a harder line on adu rental restrictions. The enforcement and penalty structure reflects that.

Tiny Homes

Metro Nashville allows tiny homes only as Detached Accessory Dwelling Units (DADUs) on a permanent foundation, capped at 700 sq ft (or 850 sq ft on lots 10,000+ sf), and only in the Urban Services District, DADU overlays, or qualifying UDO/SP plans. Tiny houses on wheels are not permitted as full-time residences.

Key details: Allowed Areas: Urban Services District, DADU overlay, UDO/SP w/ DADU. Max Size: 700 sf (<10,000 sf lot); 850 sf (≥10,000 sf). Max Height: 27 ft ridge; eave 10 ft (1-story) / 17 ft (2-story). Setbacks (≤850 sf): 1/2 side (≥3 ft); rear ≥3 ft (10 ft alley). Tiny House Code: IRC Appendix Q (≤400 sf) under 2018 IRC.

Living in a tiny house on wheels on a Metro residential lot, exceeding the 700/850 sq ft DADU cap, building without a permit, or violating setbacks, owner-occupancy, or short-term-rental rules is enforceable by Metro Codes Property Standards. Remedies include stop-work orders, removal orders, civil fines, and revocation of any related short-term-rental permit.

This is not one of those rules that cities tend to ignore. Nashville actively enforces its tiny homes requirements.

Garage Conversions

Converting an attached garage or detached garage to living space in Nashville requires a building permit. Converting a detached garage to a DADU requires a contractor permit and compliance with all DADU standards.

Key details: Permit Required: Yes: building permit before any conversion begins. Self-Permitting: NOT allowed for garage-to-DADU conversions; contractor must pull permit. Habitable Space Standards: Must meet IRC ceiling height, egress, insulation, HVAC requirements. DADU Conversion: Max 700–850 sq ft; DADU rules apply. Historic Overlay: Recorded covenant required; STR use prohibited.

Unpermitted conversion: stop-work order + retroactive permit + possible removal requirement.

The Bottom Line

Nashville is tougher than many cities when it comes to accessory structures. Out of the 6 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Nashville, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

This guide is based on Nashville's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.