Bolthole Index

Knox County, Tennessee

Building permits, zoning and land rules in Knox County, Tennessee

56Index Score / 100
#92 of 95 in Tennessee

Unincorporated Knox County, Tennessee requires a written building permit before erecting, structurally altering or moving a building or structure, with limited exceptions for work such as interior finishes and accessory farm buildings1. County zoning applies outside Knoxville and Farragut2. A residential or commercial facility without public sewer must have a subsurface sewage disposal system for its wastewater3.

At a glance

Building permit
Required for covered work in unincorporated Knox County1
Zoning
County zoning applies outside Knoxville and Farragut2
Septic permits
Handled by Knox County Health Department Groundwater Protection4
Owner-builder
Allowed for a personal residence under Tennessee's conditions5
Accessory farm buildings
Exempt from the county building-permit requirement6
RV or tiny-home living
Not confirmed; manufactured homes are allowed in RA and RB districts7
State-highway driveway
TDOT permit required before construction or a change in use8

Who to call

Codes & inspections

Knox County Codes Administration & Inspection

Building-permit applications and related plan, address and septic-layout intake

865-215-2325

[email protected]

400 Main Street, Suite 547, Knoxville, TN 37902

Septic permits

Knox County Health Department Groundwater Protection Division

Septic permits, certifications, inspections and available records for subsurface sewage disposal systems

865-215-5200

[email protected]

140 Dameron Ave, Knoxville, TN 37917

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in Knox County, Tennessee?

Yes, for most construction covered by the zoning ordinance in unincorporated Knox County. A written permit is required before erecting, structurally altering or moving a building or structure, or changing a building or land use1. Maintenance and interior finishes in houses, attached houses and duplexes are exempt, as are agricultural uses and accessory farm buildings1. A main-building permit covers accessory buildings built at the same time; a separately built accessory structure needs its own permit1. The county-set fee doubles if covered construction starts before the permit is obtained9.

Who is the Knox County building department, and how do you reach it?

Knox County Codes Administration & Inspection accepts applications at 400 Main Street, Suite 547, Knoxville, TN 37902; call 865-215-2325 or email [email protected]10. Applications are accepted from 8:00 a.m. to 4:00 p.m., and an online submission can avoid an office visit11. Bring structure drawings and a site plan; commercial plans must bear the stamp of a Tennessee-licensed architect or engineer11. The county also requires a certified address sheet, while a septic project needs a Health Department drainfield layout or septic certification11.

Does Knox County have zoning?

Yes. The Knox County zoning ordinance covers unincorporated land outside Knoxville and Farragut2. The mapped district matters: buildings in RAE and RA may cover no more than 30% of the lot, while buildings in PR may cover no more than 50% of gross site acreage12. Tennessee's farm zoning exemption is not blanket permission: a structure must be on land devoted to agriculture and incidental to the agricultural enterprise, with exceptions involving highways, airports, parks and the floodplain13. A change of a building or land to a use in the same or a more restricted classification requires a use-and-occupancy permit14.

How do septic permits work in Knox County?

Knox County Health Department Groundwater Protection administers local subsurface sewage disposal services under Tennessee regulations15. A septic permit is required to construct, modify or repair a system, and it should be obtained before dirt work or construction of the building pad begins16. A residential or commercial facility not connected to public sewer must use an SSDS for all wastewater it generates3. Contact Groundwater Protection at 865-215-520017. Only 25.5% of Knox County land is rated without severe limitations for a conventional drain field, so settle soil suitability early18.

Can you live in an RV or tiny home on land in Knox County?

We could not confirm a complete current rule for long-term RV occupancy, temporary camping or tiny-home occupancy on private land in unincorporated Knox County. Ask Knox County Codes Administration & Inspection what the parcel's mapped district permits before treating an RV or tiny home as a residence1019. Mobile or manufactured homes are expressly allowed in the RA and RB districts, while mobile-home parks require planning commission review7. A tiny home should not be assumed exempt merely because of its size: the county permit rule applies to erecting, structurally altering or moving buildings and structures1.

Building a home in Knox County: the steps, in order

  1. Confirm that the parcel is outside Knoxville or Farragut, then identify its county zoning district219.
  1. Determine whether public sewer is available; a facility without sewer must have an SSDS3.
  1. Obtain the septic permit before dirt work or building-pad construction, then secure the drainfield layout or certification required for the project1611.
  1. Obtain a certified address, prepare the site plan and drawings, and apply through Codes Administration11.
  1. Resolve access: county driveway policy applies with a building-permit application, while a state-highway connection needs TDOT approval208.
  1. An owner-builder must follow Tennessee's conditions5.

What should you check before buying land in Knox County?

Start with zoning, septic feasibility and legal access. Verify both jurisdiction and the mapped zoning district219. Conventional septic suitability deserves early attention because only 25.5% of county land is rated without severe drain-field limitations18. Terrain and clearing affect costs: 55.4% of land has a slope of 15% or less, and 65.9% is wooded2122. The USDA farmland value is $12,302 per acre, while the median annual property-tax bill is $1,332 and the effective rate is 0.5%232425. Ask Codes Administration about floodplain requirements because we could not confirm the operative county rule.

Watch-outs

  • A Knox County building permit becomes invalid if work does not start within 6 months unless the Board of Zoning Appeals extends it1.
  • Starting covered construction without the required county permit doubles the permit fee9.
  • We could not confirm current rules for private-land RV living, temporary camping, tiny-home occupancy, minimum home size or setbacks; ask Codes Administration about the parcel's district1019.
  • Knox County requires its driveway-design policy to be followed when applying for a building permit20.

Sources

  1. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  2. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  3. Groundwater Protection - Health Department - Knox County Tennessee Government, quoted and re-checked
  4. Groundwater Protection - Health Department - Knox County Tennessee Government, quoted and re-checked
  5. Can I build my own home without a license? (Tennessee statewide rule), quoted and re-checked
  6. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  7. The Zoning Ordinance of Knox County, Tennessee, quoted and re-checked
  8. Highway Entrance Permits (Tennessee statewide rule), quoted and re-checked
  9. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  10. Knox County Codes Administration & Inspection (knoxcounty.org)
  11. Permit Information - Codes Administration and Enforcement, quoted and re-checked
  12. The Zoning Ordinance of Knox County, Tennessee, quoted and re-checked
  13. Exemption from County Zoning Regulation for Buildings on Land Used for Agriculture, Opinion No. 22-07 (Tennessee statewide rule), quoted and re-checked
  14. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  15. Groundwater Protection - Knox County Health Department, quoted and re-checked
  16. Online Application for Septic Related Services, quoted and re-checked
  17. Knox County Health Department Groundwater Protection Division (knoxcounty.org)
  18. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  19. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  20. Zoning Ordinance for Knox County, Tennessee, quoted and re-checked
  21. Share of land at 15% slope or less: Bolthole Index county data
  22. Wooded share of land: Bolthole Index county data
  23. Farmland value per acre (USDA census): Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data
  25. Effective property tax rate: Bolthole Index county data

Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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County locator

Knox County in Tennessee

56
County map
Knox County highlighted among the Tennessee counties · colored by Index score

How Knox County scores

Seclusion23100% ev.
Self-Sufficiency70100% ev.
Admin Boringness46100% ev.
Durability75100% ev.
Property Autonomy71100% ev.
Carry Cost60100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$384kTypical home
0.5%Property tax
$12,302Land / acre
53.7"Annual rain
2.4% of yrsSevere drought
5.2 / yr (+5)Mid-century 100°F days
13.9 daysMid-century dry spell
2.16" (+9.6%)Mid-century 1-day rain
1.66×Wildfire change factor
100%Forward climate coverage
$1,390Home insurance / yr
-0.1% / yrInsurance growth
0.79%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
560,558People within 30 min
3,287,652People within 2 hr
421,972Radius comparison (15 mi)
984.9People / sq mi
2%Federal land
55.4%Land at 15% slope or less
25.5%Septic soil without severe limits
69,790 acWorkable land screen
65.9%Wooded land
52.4 tonsBiomass / forest ac
58.7°FAvg temp

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Answers from the rulebook for Knox County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Knox County rules

  • Building permitRequired

    Erection, structural alteration, moving of buildings or structures, and changes in building or land use in zoned unincorporated Knox County.

    • No permit is required for maintenance or installation of interior finishes in houses, attached houses, or duplexes; agricultural uses and accessory farm buildings; or home gardening or similar uses in any zone.
    • A permit for a main building covers accessory buildings constructed at the same time; otherwise each accessory building or structure requires a separate permit.
    • A permit becomes invalid six months after issuance if work has not started, unless extended by the board of zoning appeals, and is nontransferable.

    permit validity before work starts: 6 months (Unless otherwise extended by the board of zoning appeals.)

    “a written building permit shall be obtained from the department of code administration and inspections before starting or proceeding with the erection, structural alteration, or moving of any building or structure”
  • Certificate of occupancyLimited

    Changes of a building or land to a use of the same or more restricted classification in zoned unincorporated Knox County.

    • The cited requirement is for a use-and-occupancy permit upon the specified change of use; the source does not establish a universal certificate-of-occupancy requirement for all new buildings.
    “Whenever the use of a building or land is changed to a use of the same or more restricted classification a "use and occupancy" permit shall be obtained”
  • County-wide zoningPresent (with conditions)

    Land within unincorporated Knox County, outside Knoxville and Farragut municipal corporations.

    • The ordinance states its zoning authority applies to portions outside Knoxville and Farragut.
    “the county, outside the limits of the municipal corporations of Knoxville and Farragut, is hereby divided into the following zones:”
  • Zoning districtsPublished (with conditions)

    Zoning districts and map for unincorporated Knox County.

    • After February 1, 1999, rezoning map changes are recorded on maps maintained on the Knoxville-Knox County Geographic Information System or its successor.
    “The boundaries of the aforesaid zones are hereby established upon the map which is designated as the Zoning Map of Knox County, Tennessee”
  • Lot coverageDistrict specific (with conditions)

    Building coverage in the RAE, RA, and PR zoning districts in unincorporated Knox County.

    • RAE and RA main and accessory buildings may cover not more than 30 percent of lot area.
    • PR buildings may cover not more than 50 percent of gross site acreage.

    RAE/RA maximum building coverage: <= 30 percent of lot area · PR maximum building coverage: <= 50 percent of gross site acreage

    “Main and accessory buildings shall cover not more than thirty (30) percent of the lot area. [...] The maximum area which may be covered by buildings shall be fifty (50) percent of the gross acreage of the site.”
  • Manufactured homesAllowed (with conditions)

    Mobile/manufactured-home occupancy in the RA Low Density Residential and RB General Residential zones in unincorporated Knox County.

    • The rule applies within the specified county zoning districts, not countywide or within Knoxville or Farragut municipal limits.
    • Mobile-home parks are separately regulated and require planning commission approval as a use permitted on review.
    “5.11.02. Uses permitted. [...] F. Mobile homes. [...] 5.12.02. Uses permitted. [...] F. Mobile homes.”
  • Who permits septicMixed (with conditions)

    Onsite wastewater and SSDS administration in Knox County.

    • The Knox County Health Department Groundwater Protection Division administers local SSDS services under Tennessee Department of Environment and Conservation regulations and statutes.
    “This division regulates the installation”
    One more reviewed finding on this topic
  • Off-grid sanitationLimited

    Sanitation for facilities not connected to public sanitary sewer.

    • An SSDS is required to receive and treat all wastewater generated within the facility.
    “All residential and commercial facilities not connected to public sanitary sewer must have a SSDS to receive and treat all wastewater generated within the facility.”
  • Mandatory utility hookupConditional

    Residential and commercial facilities not connected to public sanitary sewer.

    • Facilities not connected to public sanitary sewer must have an SSDS to receive and treat all wastewater generated within the facility.
    “All residential and commercial facilities not connected to public sanitary sewer must have a SSDS to receive and treat all wastewater generated within the facility.”
  • Agricultural exemptionAvailable (with conditions)

    Agricultural uses and accessory farm buildings in zoned unincorporated Knox County.

    • The exemption stated is from the written building-permit requirement; it does not establish exemption from all county, state, health, or environmental requirements.
    “no permit shall be required for maintenance or installation of interior finishes in houses, attached houses or duplexes, agricultural uses and accessory farm buildings”
  • Driveway accessRequired

    Applications for building permits in zoned unincorporated Knox County.

    • The Knox County Access Control and Driveway Design Policy must be followed when applying for a building permit.
    • The policy is incorporated by reference but was not included in the opened code.
    “Whenever application for a building permit is made, the provisions of the Knox County Access Control and Driveway Design Policy shall be followed.”
  • Permit feesVariable (with conditions)

    Building permits issued under the county zoning ordinance.

    • The board of commissioners sets the fee.
    • Fees are doubled if construction begins before the necessary building permit is obtained.
    “A fee shall be set by the board of commissioners and shall be charged for issuance of each permit”
  • Permit processPublished (with conditions)

    Applications submitted to Knox County Codes Administration and Enforcement.

    • Applications are accepted from 8:00 a.m. to 4:00 p.m.
    • Beginning August 1, 2024, in-person plans larger than 11 by 14 inches must be submitted in PDF format.
    • Commercial plans must be stamped by a State of Tennessee licensed architect or engineer.
    • For a septic-system dwelling, a drainfield layout from the health department is required; additions or accessory buildings require septic certification.
    • An online permit submission does not require an office visit.
    “Applications are taken between 8:00 a.m. and 4:00 p.m. Beginning August 1, 2024, we will no longer be able to scan plans larger than 11X14, if applying in person.”
    One more reviewed finding on this topic

Tennessee rules that apply here

  • Owner-builder exemptionConditional

    A Tennessee property owner constructing a single residence for the owner's individual use.

    • The owner may have one permit every two years.
    • The residence must not be for sale, lease, or rent.
    • If the owner hires a contractor, the contractor is a prime and must be licensed and obtain the building permit for inspections.
    • Contracts may not be split into phases to circumvent the licensing law.
    • Anyone paid more than $25,000 by the owner is considered a prime and must be licensed.
    • The exemption is based on TCA 62-6-103 and Rule 0680-1-.22.

    owner permits: per 1 permit per two years · contractor payment threshold: > 25000 USD (Anyone paid in excess of this amount is considered a prime and must be licensed.)

    “one permit every two years to build their home as long as it is not for sale, lease, or rent (individual use).”
  • Septic permitRequired

    Installation of a subsurface sewage disposal system on property in Tennessee, and repair of an existing faulty system.

    • A Septic System Construction Permit is required before installation or repair.
    • The application requires site and system information; soils maps may be required and large conventional or alternative systems require a licensed-engineer design.
    • The review generally takes 10 days and must be completed within 45 days.
    • New conventional permit fee is $400 up to 1,000 gallons per day, plus $100 for each additional 1,000 gallons per day.
    • New alternative permit fee is $500 up to 1,000 gallons per day, plus $150 for each additional 1,000 gallons per day.
    • Experimental SSDS permit fee is $500.
    • Repair permits have no permit fee; repair construction inspection fee is $100.
    • Contract counties Blount, Davidson, Hamilton, Jefferson, Knox, Madison, Sevier, Shelby, and Williamson may require an additional permit.

    new conventional SSDS permit fee: 400 USD up to 1000 gallons per day design flow ($100 for each additional 1000 gpd flow) · new alternative SSDS permit fee: 500 USD up to 1000 gallons per day design flow ($150 for each additional 1000 gpd flow) · experimental SSDS permit fee: 500 USD · repair permit fee: No permit fee

    “Any individual or property owner who desires to have a subsurface sewage disposal (septic) system installed on their property or requiring repair to an existing faulty system must get a Septic System Construction Permit.”
    One more reviewed finding on this topic
    • Required — Construction, modification, or repair of septic systems serving property in Knox County, including contract-county administration by Knox County.
      “A septic system permit is required for the construction, modification or repair of a septic system.”
  • county zoning authorityGeneral

    County legislative bodies adopting zoning regulations for portions of Tennessee counties outside municipal corporations.

    • The authority is exercised under the conditions and procedures in Tennessee Code Annotated §§ 13-7-101 through 13-7-119.
    • The grant applies to portions of counties outside municipal corporations.
    • County zoning authority does not authorize county building permits or regulation of buildings or structures on agricultural land when the building or structure is incidental to the agricultural enterprise, except on agricultural lands adjacent or in proximity to state federal-aid highways, public airports or public parks.
    • The agricultural-land limitation applies to counties only and has no application to municipalities.
    “Under Tenn. Code Ann. § 13-7-101, et seq., the General Assembly has expressly delegated the authority to county legislative bodies to enact zoning regulations and create a board of zoning appeals.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Building code adopted — County building-code adoption.
  • Inspections — Building inspections for private construction.
  • Local zoning — Zoning administered by incorporated municipalities within Knox County.
  • Minimum dwelling size — Minimum dwelling floor area under Knox County zoning in unincorporated areas.
  • Living in an RV — Long-term RV occupancy on private land in unincorporated Knox County.
8 more unanswered
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • Subdividing land
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Knox County, Tennessee

Is Knox County a good place to live off-grid or homestead?

Knox County scores 56/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals and a stronger property-autonomy legal backdrop. Watch-outs: about 560,558 people within a 30-minute drive.

Do you need a building permit in Knox County, Tennessee?

Knox County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Knox County Health Department - Environmental Health / Groundwater Protection. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Knox County, Tennessee?

Land in Knox County runs about $12,302 per acre, based on the latest county data.

What is the water situation in Knox County?

Knox County gets about 53.7" of rain a year, with severe drought in roughly 2.4% of years.

How remote is Knox County?

A representative private-land location has about 560,558 people within a 30-minute drive and 3,287,652 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

Going off-grid in Knox County means bringing your own water and power. The kit we’d start with:

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How Knox compares in Tennessee

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