Do I need a permit for accessory dwelling unit (adu) in Franklin?
Yes. In Tennessee, accessory dwelling unit (adu) generally requires a permit, and Franklin is no exception.
Where the state residential program applies, a new building containing a dwelling unit, a change of occupancy of an existing building to a dwelling, or an addition of 30 square feet or more of interior space needs a state building permit, and it cannot be occupied until the State Fire Marshal's Office issues a certificate of occupancy. The state building permit application requires you to certify public sewer availability or a septic permit. The state permit is not zoning approval, so whether an ADU is allowed on your lot is decided by your city or county. Wiring a new dwelling unit needs an electrical permit and inspection under Rule 0780-02-01, issued by the state electrical program or by your local electrical program. Tennessee's state residential permit program, run by the State Fire Marshal's Office, applies only in cities and counties that neither enforce their own residential code nor opted out by a two-thirds vote. Everywhere else your city or county sets the permit rules, so confirm with your local codes office.
Documents you may need
- Site plan showing the unit, setbacks, and utility routesRequired
- Floor plans and construction drawingsLikely required
- Proof of public sewer availability or a septic permitRequired
- Electrical permit for the unit's wiringRequired
- Local zoning approval for an accessory dwellingVerification needed
Possible inspections
- Foundation inspection before concrete is placed
- Framing and rough-in inspection (plumbing, mechanical, electrical)
- Insulation or energy inspection
- Final inspection and certificate of occupancy
Frequently asked questions
- Do I need a permit for accessory dwelling unit (adu) in Franklin?
- Yes. In Tennessee, accessory dwelling unit (adu) generally requires a permit, and Franklin is no exception. The documents and inspections sections on this page list what the building department typically asks for.
- Who issues the permit in Franklin?
- The local building department for Franklin handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.