Garage conversion rules in Nashville, TN — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
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.
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.
Unpermitted conversion: stop-work order + retroactive permit + possible removal requirement.
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See how Nashville's garage conversions rules stack up against other locations.
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