Do I need a permit for shed or accessory structure in Unincorporated Knox County?
It depends. Whether shed or accessory structure needs a permit in Unincorporated Knox County comes down to the details of your project.
A shed that will have electricity, plumbing, or a permanent foundation falls outside the usual small accessory building exemption, which generally covers simple unpowered structures only. Electrical and plumbing work each normally require their own permit and inspection even when the structure itself would have been exempt, and many jurisdictions require a licensed electrician or plumber to pull them. Zoning setbacks, height limits, and lot coverage are reviewed separately from the building permit, so confirm placement with your local department before the shed is delivered or poured. Tennessee does not set one statewide shed threshold, and the 200 square foot figure from the model International Residential Code does not govern here. Who enforces residential construction depends on your address: where a city or county has neither taken on residential code enforcement itself nor opted out by a two-thirds vote of its legislative body, the State Fire Marshal's Office runs the residential permit and inspection programme using state-contracted inspectors. So the first question is not the size of the shed but which authority covers you. Confirm whether your city or county enforces its own code, has opted out, or falls under the State Fire Marshal programme, then ask that office for the size threshold. Zoning setbacks apply regardless, and a separate permit is needed for any electrical service run to the shed. In Knox County, permits outside the cities are handled by the Knox County Codes Administration and Enforcement office, reachable on 865-215-2325 at https://www.knoxcounty.org/codes/. Its online permit portal is https://epw-permitsubmit.knoxcountytn.gov/. Where a Tennessee local government has neither taken on residential code enforcement itself nor opted out by a two-thirds vote, the State Fire Marshal's Office runs the residential permit and inspection programme instead. Confirm whether Knox County enforces its own code or the state does. Ask specifically about the size that triggers a permit and about setbacks, since those are set locally and are the two things people most often get wrong on a shed.
Documents you may need
- Permit applicationLikely required
- Site plan showing setbacks and structure sizerequired
- Foundation/anchoring and construction details for larger structuresSometimes required
Possible inspections
- Setback / footing inspection where a permit is issued
- Final inspection
Frequently asked questions
- Do I need a permit for shed or accessory structure in Unincorporated Knox County?
- It depends. Whether shed or accessory structure needs a permit in Unincorporated Knox County comes down to the details of your project. A shed that will have electricity, plumbing, or a permanent foundation falls outside the usual small accessory building exemption, which generally covers simple unpowered structures only. Electrical and plumbing work each normally require their own permit and inspection even when the structure itself would have been exempt, and many jurisdictions require a licensed electrician or plumber to pull them. Zoning setbacks, height limits, and lot coverage are reviewed separately from the building permit, so confirm placement with your local department before the shed is delivered or poured. Tennessee does not set one statewide shed threshold, and the 200 square foot figure from the model International Residential Code does not govern here. Who enforces residential construction depends on your address: where a city or county has neither taken on residential code enforcement itself nor opted out by a two-thirds vote of its legislative body, the State Fire Marshal's Office runs the residential permit and inspection programme using state-contracted inspectors. So the first question is not the size of the shed but which authority covers you. Confirm whether your city or county enforces its own code, has opted out, or falls under the State Fire Marshal programme, then ask that office for the size threshold. Zoning setbacks apply regardless, and a separate permit is needed for any electrical service run to the shed. In Knox County, permits outside the cities are handled by the Knox County Codes Administration and Enforcement office, reachable on 865-215-2325 at https://www.knoxcounty.org/codes/. Its online permit portal is https://epw-permitsubmit.knoxcountytn.gov/. Where a Tennessee local government has neither taken on residential code enforcement itself nor opted out by a two-thirds vote, the State Fire Marshal's Office runs the residential permit and inspection programme instead. Confirm whether Knox County enforces its own code or the state does. Ask specifically about the size that triggers a permit and about setbacks, since those are set locally and are the two things people most often get wrong on a shed.
- Who issues the permit in Unincorporated Knox County?
- The local building department for Unincorporated Knox County 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.