Nashville, TN Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Nashville, TN, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- 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
Summary
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.
By definition (17.04.060) a DADU shall be clearly subordinate in size, height, and purpose to the principal structure, it shall be located on the same lot as the principal structure and is detached from the principal structure. A detached accessory dwelling unit can be an independent structure, it can be a dwelling unit above a garage, or it can be attached to a workshop or other accessory structure on the same lot as the principal structure. The detached accessory dwelling shall be owned by the same person as the principal structure and one of the two dwellings shall be owner-occupied. A property owner is not permitted to pull a self-permit to construct a DADU or to renovate an existing garage into a DADU. A contractor must pull the permit. If the DADU was already permitted as a DADU and renovations are needed, then the homeowner can pull the permit for work up to $25,000.
Full Breakdown
A building permit is required to convert any accessory space (attached garage, basement, attic) to habitable/living space. For detached garages converted to a DADU, a contractor must pull the permit: self-permitting is not allowed. The converted space must meet all IRC requirements for habitable space including minimum ceiling height, insulation, egress, electrical, plumbing, and HVAC. DADU standards apply: max 700 sq ft (850 on lots >10,000 sq ft), subordinate to principal structure, 5-ft setbacks. In historic overlays, a covenant must be recorded before permits are issued. DADUs created from garage conversions may not be rented short-term.
Violations & Fines
Unpermitted conversion: stop-work order + retroactive permit + possible removal requirement.
Frequently Asked Questions
Can I convert my garage into living space in Nashville?
What permits do I need for a garage conversion in Nashville?
Sources & Official References
Other rules in Nashville
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