Bolthole Index

Unicoi County, Tennessee

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

66Index Score / 100
#66 of 95 in Tennessee

Unicoi County, Tennessee is listed as an opt-out jurisdiction under the state residential building program, so a state residential permit is available for an optional inspection rather than imposed through the standard statewide program12. The county's own local building-permit requirement and zoning rules could not be confirmed; ask Unicoi County Planning and Development before designing for an unincorporated parcel345. Septic construction permits come from TDEC's Division of Water Resources6.

At a glance

Building permit
State program is opt-out; confirm any local requirement with county Planning and Development135
Optional state inspection
Available through a state residential permit in an opt-out jurisdiction21
Zoning
Unconfirmed for unincorporated Unicoi County; ask Planning and Development45
Septic permit
Required through TDEC before installing or repairing a septic system67
Owner-builder
Conditional state exemption for a personal residence that will not be sold, leased or rented8
RV and tiny-home living
Unconfirmed; ask Planning and Development before relying on either use45
Septic soil difficulty
Only 1.6% of soils rate without severe limits for a conventional drain field9

Who to call

Planning & zoning

Unicoi County Planning and Development

County contact for parcel-specific planning, zoning and local building-permit questions

423-743-9391

100 North Main Ave. #102 | Erwin, TN 37650

Building permits

Tennessee State Fire Marshal's Office assigned residential inspector for Unicoi County

State residential permit inspections requested for Unicoi County as an opt-out jurisdiction

423-672-8967

[email protected]

Online permits →

Septic permits

Johnson City Environmental Field Office (TDEC Division of Water Resources)

Septic permit help, site evaluations, inspections and existing septic layout requests for Unicoi County

(423) 854-5400

[email protected]

2305 Silverdale Drive, Johnson City, TN 37601-2162

Online permits →

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

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

Unicoi County appears as "OPT OUT" on the State Fire Marshal's official residential-inspector list1. Tennessee's statewide residential permit requirement applies only where the state program operates; local governments may enforce their own codes, and counties may remove unincorporated areas from the state program10. That means the standard mandatory state permit cannot by itself answer whether Unicoi County requires a local permit3. Unicoi County does not publish enough detail on its Planning and Development page to confirm the local requirement, applicable code, fees or inspection sequence, so ask that department about the exact parcel and project53. Owners who want a state inspection may obtain a state building permit in an opt-out jurisdiction, and the State Fire Marshal may release a Certificate of Occupancy when the dwelling meets statewide safety standards2.

Who handles building and planning questions in Unicoi County?

Start with Unicoi County Planning and Development for the local answer on an unincorporated parcel; the county publishes the department page with its courthouse contact information5. Ask whether the proposed house, addition, manufactured home or accessory structure needs a local approval, which code authority applies and which inspections are required3. For an optional state inspection, Tennessee's official jurisdiction list provides an assigned residential inspector for opt-out Unicoi County1. A state inspection is a separate path: an owner or contractor may obtain a state building permit to request inspection of a new or expanded dwelling in an opt-out jurisdiction2. Tennessee's state residential permit does not replace septic approval, floodplain compliance, grading approval, electrical permits or any locally adopted requirement10.

Does Unicoi County have zoning?

County zoning for unincorporated Unicoi County could not be confirmed from the county's published material4. Tennessee law authorizes county legislative bodies to zone areas outside municipalities, but that statewide authority does not prove that Unicoi County adopted a zoning resolution or establish a parcel's district11. Ask Unicoi County Planning and Development to confirm the parcel's jurisdiction, allowed use, setbacks, minimum lot size, minimum dwelling size, building height and any floodplain review before relying on a site plan54. Incorporated Erwin and the Town of Unicoi are separate jurisdictions, so a county answer should not be assumed to govern land inside either municipality5. If county zoning applies, Tennessee's agricultural exception is conditional: a structure must be on land devoted to agricultural use and incidental to the agricultural enterprise, with exceptions near specified public facilities and in the floodplain12.

How do septic permits work in Unicoi County?

A Septic System Construction Permit is required before installing a new septic system or repairing a faulty one in Unicoi County7. TDEC's Johnson City Environmental Field Office serves Unicoi County and is the practical contact for permit help, records and the local site-evaluation process1314. A new conventional permit costs $400 for design flow up to 1,000 gallons per day, while a new alternative permit costs $500 at the same design flow; higher flows add fees7. Only 1.6% of county soils rate without severe limits for a conventional drain field, so make septic feasibility an early purchase contingency rather than assuming a standard layout will work9. Keep the installed system uncovered until the Environmental Scientist conducts the final inspection; approval leads to a Certificate of Completion15. Electrical service also depends on written notice showing public sewer service, a septic application or use of an existing septic system16.

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

Long-term RV occupancy, temporary camping and tiny-home occupancy on private land in unincorporated Unicoi County could not be confirmed4. The same gap applies to manufactured homes, accessory dwellings, minimum home size and residential setbacks4. Ask Unicoi County Planning and Development for a written parcel-specific answer before buying an RV or small dwelling for residential use5. The county's opt-out status under the state residential program does not settle land use, sanitation, utility connections or floodplain requirements110. Any occupied project still needs a workable sanitation plan because new or repaired septic systems require state approval, and the electrical-service process requires written notice of sewer or septic status716. A tiny structure intended as a home should therefore be checked with Planning and Development and TDEC before purchase or placement514.

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

  1. Confirm whether the parcel is in unincorporated Unicoi County, Erwin or the Town of Unicoi, because the county planning page identifies separate local-government contacts5.
  2. Ask Unicoi County Planning and Development to confirm local permits, zoning, setbacks, floodplain review and the inspection sequence for the parcel54.
  3. Have TDEC evaluate septic feasibility and obtain the required construction permit before installing or repairing a system147.
  4. Decide whether to request an optional state inspection and Certificate of Occupancy through the state permit path available in opt-out jurisdictions12.
  5. If acting as owner-builder, keep the home for individual use and do not offer it for sale, lease or rent under the conditional Tennessee exemption8.
  6. Obtain a TDOT entrance permit before building or changing a driveway on state highway right-of-way17.
  7. Leave the septic system uncovered for TDEC's final inspection and retain the Certificate of Completion15.

What should you check before buying land in Unicoi County?

Septic and slope are the first physical screens: only 1.6% of soils rate without severe conventional-drain-field limits, and only 13% of the county is at a slope of 15% or less918. The county is 93.8% wooded, so verify the buildable pad, access and clearing needs on the actual tract19. Annual precipitation averages 51.1 inches, but water-well permitting and expected well yield could not be confirmed; ask Planning and Development who handles a private-water proposal205. A driveway on state highway right-of-way needs TDOT approval before construction or a change in use17. The effective property-tax rate is about 0.6%, and the median annual property-tax bill is about $9602122. Before closing, make the contract contingent on written land-use confirmation and septic feasibility because both can change the practical buildable area47.

Watch-outs

  • Unicoi County's opt-out listing answers the state-program question but does not confirm whether a separate local building approval applies; ask Planning and Development before starting work135.
  • County zoning, RV occupancy, tiny-home occupancy, minimum dwelling size and setbacks remain unconfirmed for unincorporated land; obtain a parcel-specific answer from Planning and Development45.
  • Only 1.6% of county soils rate without severe limits for a conventional drain field, so do not treat an undeveloped lot as septic-ready without TDEC review914.

Sources

  1. Tennessee State Fire Marshal's Office assigned residential inspector for Unicoi County (tn.gov)
  2. Statewide Building Construction Code Inspections in “Opt-Out” or “Non-Code” Jurisdictions (Tennessee statewide rule), quoted and re-checked
  3. Residential Permit FAQs (2026 county census)
  4. (2026 county census)
  5. Unicoi County Planning and Development (unicoicountytn.com)
  6. TDEC - Subsurface Sewage Disposal Systems (SSDS) (2026 county census)
  7. Septic System Construction Permit (Tennessee statewide rule), quoted and re-checked
  8. Can I build my own home without a license? (Tennessee statewide rule), quoted and re-checked
  9. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  10. Residential Permit FAQs (Tennessee statewide rule), quoted and re-checked
  11. Tennessee Attorney General Opinion No. 10-108 (Tennessee statewide rule), quoted and re-checked
  12. Exemption from County Zoning Regulation for Buildings on Land Used for Agriculture, Opinion No. 22-07 (Tennessee statewide rule), quoted and re-checked
  13. Subsurface Sewage Disposal System (SSDS) Frequently Asked Questions, quoted and re-checked
  14. Johnson City Environmental Field Office (TDEC Division of Water Resources) (tn.gov)
  15. Subsurface Sewage Disposal System (SSDS) Frequently Asked Questions, quoted and re-checked
  16. Online Application for Septic Related Services, quoted and re-checked
  17. Highway Entrance Permits (Tennessee statewide rule), quoted and re-checked
  18. Share of land at 15% slope or less: Bolthole Index county data
  19. Wooded share of land: Bolthole Index county data
  20. Annual precipitation: Bolthole Index county data
  21. Effective property tax rate: Bolthole Index county data
  22. Median property tax bill: Bolthole Index county data

Written September 28, 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

Unicoi County in Tennessee

66
County map
Unicoi County highlighted among the Tennessee counties · colored by Index score

How Unicoi County scores

Seclusion31100% ev.
Self-Sufficiency56100% ev.
Admin Boringness6577% ev.
Durability86100% ev.
Property Autonomy71100% ev.
Carry Cost68100% ev.

Evidence strength: 96%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$251kTypical home
0.6%Property tax
$10,994Land / acre
51.1"Annual rain
0.7% of yrsSevere drought
0.3 / yr (+0.3)Mid-century 100°F days
10.8 daysMid-century dry spell
1.74" (+8.5%)Mid-century 1-day rain
1.67×Wildfire change factor
100%Forward climate coverage
$1,335Home insurance / yr
-0.5% / yrInsurance growth
1.28%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
143,827People within 30 min
3,007,364People within 2 hr
86,814Radius comparison (15 mi)
95.4People / sq mi
10.6%Federal land
13%Land at 15% slope or less
1.6%Septic soil without severe limits
1,766 acWorkable land screen
93.8%Wooded land
82.3 tonsBiomass / forest ac
53.8°FAvg temp

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Answers from the rulebook for Unicoi County

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

Tennessee rules that apply here

  • Building permitLimited

    State residential building permits for one- and two-family dwellings and townhouses in Tennessee jurisdictions where the State Fire Marshal's Office administers the residential building permit program.

    • The state permit is required only in some areas because other jurisdictions may enforce local residential building codes.
    • A county legislative body may remove unincorporated areas from the state program or a city legislative body may remove the city by a two-thirds vote.
    • The state permit does not replace grading or fill approval, floodplain compliance, septic or sewer permits, electrical permits, or zoning approval.
    • Local governments remain responsible for locally adopted codes and other requirements.
    “Why is the state residential building permit only required in some areas of the state?”
  • 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).”
  • Certificate of occupancyLimited

    Certificates of occupancy for one- and two-family dwellings in Tennessee opt-out or non-code jurisdictions when the State Fire Marshal's Office inspects the dwelling during construction.

    • The owner or contractor may obtain a state building permit to request the inspection.
    • The Certificate of Occupancy is released only if the dwelling is determined to meet statewide building construction safety standards.
    • The source describes this process for opt-out or non-code jurisdictions and for new construction or additions to existing homes.
    “determined to meet the statewide building construction safety standards, the State Fire Marshal’s Office will release a Certificate of Occupancy”
  • Who permits septicState

    Subsurface sewage disposal services affecting Unicoi County.

    • TDEC's Division of Water Resources administers the septic permit process; local Environmental Scientists conduct site evaluations and final inspections.
    “Carter, Greene, Hancock, Hawkins, Johnson, Sullivan, Unicoi, Washington”
  • 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.”
  • Septic inspectionRequired

    Final inspection of septic-system installation in Unicoi County.

    • The final inspection occurs before the system is covered.
    • If the installation is approved, the Environmental Scientist issues a Certificate of Completion.
    “schedule a final inspection before the system is covered.”
  • Mandatory utility hookupSewer (with conditions)

    Residential, commercial, or industrial buildings on lots or parcels abutting a street or other public way containing a sanitary sewer, where the applicable Tennessee utility system has issued bonds payable for sewer services.

    • The cited Tennessee statute grants qualifying utility systems authority to require connection.
    • The building must exist on the abutting lot or parcel.
    • The owner, tenant, or occupant may be required to cease using other means for disposal of sewage, sewage waste, or other polluting matter.
    • This source describes authority to require sewer connection; it does not establish that every Tennessee property has sewer available.
    “Utility systems within the State of Tennessee that have issued bonds payable for sewer services are granted authority in TCA § 7-35-201 (1) to "require the owner tenant or occupant of each lot or parcel of land that abuts upon a street or other public way containing a sanitary sewer and upon which lot or parcel a building exists for residential, commercial or industrial use, to connect the building with the sanitary sewer and to cease to use any other means for the disposal of sewage, sewage waste or other polluting matter."”
    One more reviewed finding on this topic
    • Conditional — Electrical service for a proposed house or establishment in Unicoi County.
      “before the electrical inspector can process a request for electrical service, he/she must be provided with written notification”
  • Agricultural exemptionConditional

    Buildings or structures on land used for agricultural purposes and subject to county zoning regulation in Tennessee.

    • The building or structure must be located on lands devoted to agricultural uses.
    • The building or structure must be incidental to the agricultural enterprise.
    • The exemption does not apply to agricultural lands adjacent or in proximity to state or federal-aid highways, public airports, or public parks.
    • The exemption does not apply to land located within the one-hundred-year flood plain.
    • The Attorney General opinion states that the provision applies to counties only and has no application to municipalities.
    • There is no blanket exemption for cotton gins, grain elevators, slaughterhouses, processing plants, or milk bottling plants; those structures qualify only when the statutory conditions are met.
    “it must be located on lands “devoted to agricultural uses;” and (2) it must be “incidental to the agricultural enterprise.””
  • Driveway accessLimited

    Construction, modification, revision, or change in use of a driveway on Tennessee state highway right-of-way.

    • The requirement applies to state highway right-of-way and does not establish a permit requirement for every driveway on every road.
    • Property owners must obtain the permit from TDOT.
    • County or municipal land-use regulations may also apply.
    “Under state law, a permit is required before construction of a driveway on state highway right-of-way, including the modification, revision, or change in use”
  • Permit feesPublished (with conditions)

    Residential building permits administered by Tennessee's State Residential Building Code Enforcement Program for one- and two-family dwellings and townhouses where the state program applies.

    • The state program does not apply where a local government enforces local building codes under an exemption or where the city or county has opted out by a two-thirds vote.
    • For construction costs above the maximum listed in the table, an additional fee of $50.00 applies for each additional $50,000 or fraction thereof.
    • The construction cost cannot be less than $60.57 per heated square foot of construction.
    • An HVAC and Plumbing Inspection is required for all new construction.
    • A slab other than Monolith Pour Inspection is required when slab and footing are cast separately.

    permit fee for construction cost $0 to $5,000: 100 USD · permit fee for construction cost $5,001 to $100,000: 350 USD · additional fee for plumbing and HVAC inspection: 100 USD (Applicable as stated in the fee table.) · additional fee for slab other than monolith pour: 100 USD (Applicable when slab and footing are cast separately.)

    “$0 to $5,000 | $100 | $100 | $100 $5,001 to $100,000 | $350 | $100 | $100”
  • Permit processPublished (with conditions)

    Residential permit purchase and inspection process under Tennessee's State Residential Building Code Enforcement Program.

    • The state program applies to one- and two-family dwellings and townhouses only in areas without the stated local-code exemption or opt-out.
    • A first-time CORE user must register for an account.
    • A building permit must be purchased online or at a local Issue Agent.
    • Inspections cover the foundation before pouring, framing/rough-in construction, and final construction.
    • One free re-inspection is available; each additional re-inspection requires an additional fee.
    • A homeowner may build a home only if it will be the homeowner's residence, not sold or leased, and the homeowner has not received a homeowner building permit during the preceding 24 months.
    • Detached garages, sheds, barns, and other detached structures not used for living purposes do not require a state residential building permit.
    • A permit is not required for installation of a manufactured or modular home, but custom site work such as a deck, patio, or stoop requires a permit.

    effective date for permit requirement for additions over 30 square feet: 2011-10-01 (Applies to additions to existing homes.) · free re-inspections per project: 1 inspection (Available if a required inspection is not passed the first time.)

    “A building permit must be purchased online or at a local Issue Agent. The cost of the building permit is based on the estimated cost”
  • 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 — Building-code adoption applicable in Unicoi County.
  • Inspections — Building inspections in Unicoi County.
  • County-wide zoning — Countywide zoning authority in Unicoi County, including unincorporated areas.
  • Local zoning — Aggregate local zoning across Unicoi County municipalities and unincorporated areas.
  • Zoning districts — Published zoning districts for Unicoi County.
14 more unanswered
  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Off-grid sanitation
  • Well permit
  • 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 Unicoi County, Tennessee

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

Unicoi County scores 66/100 on the Bolthole Index, a strong county profile. Its strengths: mixed durability signals and a stronger property-autonomy legal backdrop. Watch-outs: about 143,827 people within a 30-minute drive.

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

Unicoi County requires a building permit only in limited cases (such as floodplains or specific zones). Onsite septic is permitted by Tennessee Department of Environment and Conservation (TDEC), Division of Water Resources. 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 Unicoi County, Tennessee?

Land in Unicoi County runs about $10,994 per acre, based on the latest county data.

What is the water situation in Unicoi County?

Unicoi County gets about 51.1" of rain a year, with severe drought in roughly 0.7% of years.

How remote is Unicoi County?

A representative private-land location has about 143,827 people within a 30-minute drive and 3,007,364 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 Unicoi County means bringing your own water and power. The kit we’d start with:

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How Unicoi compares in Tennessee

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