Is It Legal to Live Off-Grid in Tennessee?

Most states force a trade-off: permissive rules on land that cannot support you, or good land wrapped in red tape. Tennessee is the rare case where both line up.

The numbers behind it: water scores 24 of 25 and food 14 of 15. Tennessee gets dependable rainfall, shallow-enough groundwater across much of the state, and a growing season long enough for a real garden, the things an off-gridder and a homesteader lean on most. Solar is workable rather than exceptional and hazards are moderate, so the catch is rarely the climate. It is the parcel, specifically whether the soil drains well enough to build, which the septic section below covers.

Under state law (T.C.A. Title 13, Chapter 7), a Tennessee county may zone the land outside its cities, but it is not required to. The statute says “may,” not “shall,” and many counties never adopted a zoning ordinance. Where there is no zoning, there is no use district telling you a cabin, a manufactured home, or livestock does not belong, and no minimum-lot rule the county can hold over you.

Two honest caveats. First, we cannot give a clean “X of 95 counties are unzoned” number. That figure floats around the internet but is not primary-sourced, so treat it as “common, verify yours.” Second, unzoned does not mean unregulated: septic, well, floodplain, and subdivision rules still apply, and some counties enforce a building code (next section).

Under state law (T.C.A. § 68-120-101), a county can vote, by a two-thirds resolution of its commission, to “opt out” of the statewide residential building code for one- and two-family homes. In an opt-out county there are no required residential building permits and no inspections for a house. By the Municipal Technical Advisory Service’s count, roughly 20% of Tennessee’s population lives in these non-code areas (MTAS, 2025).

As of the Tennessee State Fire Marshal’s “Residential Jurisdictions” list (updated October 24, 2025), these counties have opted out countywide:

Benton, Bledsoe, Carroll, Claiborne, Cocke, Decatur, Fentress, Franklin, Grainger, Grundy, Hardin, Henderson, Henry, Houston, Humphreys, Jackson, Johnson, Lake, Lawrence, Lewis, McMinn, McNairy, Monroe, Morgan, Obion, Overton, Perry, Pickett, Polk, Sequatchie, Scott, Stewart, Unicoi, Van Buren, Wayne, and Weakley.

A few more counties have opt-outs only in specific small cities (for example Crab Orchard in Cumberland County). Even in a non-code county you can still request a voluntary State Fire Marshal inspection and Certificate of Occupancy, which is useful if a lender requires one to finance the build. Opting out of the building code does not opt you out of septic or well rules. Those are state-run and apply everywhere.

Before drilling, a Notice of Intent to Drill (Form CN-1240) goes to the Tennessee Department of Environment and Conservation (TDEC), and the well must be drilled by a TDEC-licensed water well driller. Even a general contractor cannot legally do it without that license. After the well is finished, the driller files a Water Well Driller’s Report (Form CN-0825). These rules (TDEC Rule 0400-45-9, TN Code Title 69, Chapter 10) are statewide, so they apply identically in a zero-zoning county.

One accuracy note, because the off-grid blogs get this wrong: some guides claim Tennessee requires a permit for wells over “10,000 gallons per day.” That figure is a water-withdrawal registration threshold for large users under TDEC, not a residential well permit. A normal home well is nowhere near it. The Notice of Intent does carry a state charge the cost numbers should include: TDEC charges $75 per property site for the CN-1240 (Tenn. Comp. R. & Regs. 0400-45-09-.10). It is waived where a local jurisdiction runs its own well inspection and fee, and it is not charged again if the same owner filed and paid an NOI for the same property within the prior five years and cites that earlier filing. (Costs are in the dedicated section below.)

Those are the legal steps to drill. For the physical side, how much water a household actually needs, what a well costs, and how to check a parcel's water before you buy, see our off-grid water guide.

A septic system (officially a Subsurface Sewage Disposal System, or SSDS) needs a TDEC permit before you build, modify, or repair it, and that starts with a soil and site evaluation. This evaluation, sometimes called a “perc test” (short for percolation, how fast water soaks through the ground), runs under TDEC’s percolation test procedures (Rule 0400-48-01-.05) and checks two things: that any rock formation sits at least 4 feet below the bottom of the disposal field for a standard system (Rule 0400-48-01-.04; the 24-inch-over-a-restrictive-layer figure applies to mound systems under Rule 0400-48-01-.15), and that the slope is under 30% (the under-30% slope limit is set by TDEC Rule 0400-48-01-.04). Soil that drains at 75 minutes per inch or faster can take a standard system; slower than that is too slow for a standard field (Rule 0400-48-01-.07). The soil that fails is the clay that still holds water on the surface a day after a rain. The rules allow pricier alternative systems for poor soil, including Low Pressure Pipe, Mound, Subsurface Drip, and Lagoon (Rule 0400-48-01-.15; a lagoon needs a 5-acre minimum tract and is capped at 750 gallons per day).

One exception to the “it is all run by the state” rule: nine populated counties run their own septic permitting through a local health office instead of TDEC. Blount, Davidson, Hamilton, Jefferson, Knox, Madison, Sevier, Shelby, and Williamson (TDEC, 2025). If your land is in one of those, call the county. Everywhere else, it is TDEC.

If the soil drains and there is enough suitable depth on a buildable slope, a small lot can work. If it does not, you may need more land for an alternative system. A lagoon, for instance, needs a 5-acre tract. Where a county does zone, it adds its own minimum on top. In Anderson County the agricultural A-1 district sets a 22,000-square-foot (about half-acre) building minimum, and rural-residential land without public water needs 22,500 square feet, with lots not below an acre. (The much-quoted 7,500-square-foot Anderson minimum applies only where there is both public water and sewer, which off-grid parcels do not have, so it does not apply to you.) Sullivan County requires 1 acre in A-1 and 5 acres in A-5. One acreage threshold cuts the other way, in your favor. Under Tennessee's Greenbelt program (the Agricultural, Forest and Open Space Land Act of 1976, Tenn. Code Ann. §§ 67-5-1001 through 1050), qualifying land is taxed on its present agricultural or forest use instead of market value, which lowers the annual property-tax bill: agricultural or forest land needs at least 15 acres, open-space land at least 3 acres. You apply with the county property assessor by March 15 to take effect for that tax year, per the Tennessee Comptroller's State Board of Equalization.

A composting toilet must be NSF Standard 41 certified (TDEC Rule 0400-48-01-.17). The catch is running water: a composting toilet does not get you out of needing septic if the dwelling has any. The rule will not permit one “where the facility has running water available unless there is an acceptable means to dispose of wastewater.”

There is no statute that flatly “authorizes” them, so the honest framing is “allowed, but the disposal and plumbing rules still apply.” If you plumb rainwater into the house for drinking, the state plumbing code and treatment standards come into play, and greywater still needs a permitted path rather than just running onto the ground. For a rainwater-fed or greywater-irrigation setup, confirm the specifics with the local environmental-health office.

In an unzoned county with no building code, nothing in the county's rules stops you, though the wastewater requirement below still does. In a zoned county the rules vary widely. Sullivan County, for example, flatly bans it: its ordinance (Section 8-105) says “no camper, recreational vehicle (RV), or any other automotive vehicle may be used as a permanent residential dwelling,” allowing them only for temporary or seasonal use in approved campgrounds or lake lots.

The permitting is light: the installer gets a permit from the county clerk and pays a $45 fee (T.C.A. § 68-126-406), and homes placed after January 1, 2004 carry a state decal. So in an unzoned county, a single-wide on land can be a few hundred dollars of paperwork plus the home itself, with no building permit at all.

A HUD-code manufactured home is regulated differently from a modular (site-built-code) home, and the installer must be state-licensed. Some counties cap the age of a used mobile home you can bring in. And in zoned counties, some residential districts restrict single-wides even where double-wides are allowed (Sullivan permits a single-wide in agricultural districts but not in its R-1 district). A tiny home on a permanent foundation is treated like any small dwelling, subject to the local building code if there is one, and to septic either way. A tiny home on wheels is treated like an RV.

The big rural-build costs are water, waste, and power. These are the ranges our property report generates for a parcel like this, from the same cost model that runs on every paid report:

• Well: Tennessee is mid-range for drilling, about $35 to $75 per foot plus a $2,000 to $5,000 pump and pressure tank. On a typical 250-foot Tennessee well, roughly $11,000 to $24,000.
• Septic: about $5,000 to $10,000 for a standard system on good soil, $10,000 to $20,000 if poor drainage forces an alternative or mound system, $15,000 to $25,000 for an engineered system on very poor soil. The soil evaluation comes first and is a small fee by comparison.
• Solar and battery: about $2.50 to $3.50 per watt installed, plus $5,000 to $10,000 for a lithium battery bank. A modest 5 kW off-grid setup runs roughly $17,500 to $27,500.
• Manufactured-home permit: the $45 county-clerk fee above. The home itself is separate.
• Building permit (code counties only): typically a few hundred dollars, set by the county and scaled to the project’s value. There is none in an opt-out county.
• Road and site work: $3,000 to $8,000 for a driveway off a paved road, $8,000 to $20,000 to grade and gravel a rough track, and $15,000 to $40,000 to build access where there is no road. A landlocked parcel needing a half-mile or more of new road can run past $100,000 a mile. Clearing a homesite runs $1,000 to $4,000 an acre.

All in, our report puts development for a typical rural Tennessee parcel at roughly $32,000 to $65,000 (well, septic, solar, road, and clearing), before land. One recurring cost the build budget does not capture is property tax, and Tennessee offers a way to cut it on rural land. Under the Greenbelt program (Agricultural, Forest and Open Space Land Act of 1976, Tenn. Code Ann. 67-5-1001 through 1050), the county assessor values qualifying land on its present agricultural or forest use instead of market value, which lowers the annual tax bill. Agricultural and forest land each need at least 15 acres, open-space land at least 3, and the application goes to the county property assessor by March 15 to take effect that tax year, per the Tennessee Comptroller's State Board of Equalization. Run a specific address through the free property score for that parcel's own numbers.

The binding utility constraint is not power, it is wastewater. You need an approved septic path (or a composting toilet plus an approved greywater path), and that requirement holds even on land with no zoning and no building code. The state does not care whether you are on the grid. It cares where your wastewater goes.

Tennessee’s Right to Farm Act (T.C.A. § 43-26-103) creates a rebuttable presumption that an agricultural operation is not a nuisance, which protects an established farm following generally-accepted practices from a new neighbor trying to shut it down. It is real protection. Subsection (a) covers any farm following generally-accepted practices, including a brand-new one, so a fresh operation is not excluded. The one-year threshold in subsection (b) applies only when you start a new type of farming operation. It is not blanket permission, since the presumption can still be rebutted if you fall short of accepted practices or break a TDEC or Department of Agriculture rule.

Beyond that, the off-grid permissiveness is a homesteading advantage. In an unzoned, non-code county you can put up barns and outbuildings without a permit (in a code county like Anderson, a non-farm structure over 100 square feet or $1,000 triggers one, though Anderson waives the permit for buildings tied to an identifiable farm in the tax system under T.C.A. § 13-7-114). And Tennessee’s land scores well for growing. In our Best States for Off-Grid Living it scores 89 out of 100 (Excellent, rank #10 of 50), with water at 24/25 and food at 14/15, meaning dependable rainfall and groundwater plus a workable growing season. The legal layer is permissive and the physical layer is strong, which is a rare pairing.

A recorded subdivision’s deed covenants (often called CC&Rs) can ban mobile homes, RVs, or outbuildings even where the county regulates nothing at all. The private rules replace the public ones.

Here is a real example of each, which also shows that we read the actual ordinances.

Fentress is the blank slate: no zoning, no county building permit, opt-out confirmed. The cleanest legal setup of the three, though state septic and well rules still apply. A single-wide or cabin needs no county building permit.

Anderson requires a permit: the county zones its land and requires a building permit for any structure over 100 square feet or $1,000, with a roughly half-acre off-grid minimum lot (A-1, 22,000 square feet). Confirm RV and manufactured-home rules with Planning.

Sullivan is the most regulated: a full zoning resolution plus the 2018 building code, minimum lots from 1 to 5 acres, single-wides limited to certain districts, and a full-time RV ban (Section 8-105). The kind of place you read the ordinance before you make an offer.

This guide covers what is legal in Tennessee, but legal is not the same as buildable: a parcel can be perfectly legal and still have no usable groundwater, sit in a flood or wildfire zone, or fail a septic soil test. It reads water, legal access, energy, hazards, food, and buildability for one address from FEMA, USGS, USDA, and NLR-PVWatts data in about a minute, so you screen a property before you spend on a site visit.

This guide is for two kinds of buyer. An off-gridder wants to disconnect from utilities and live self-sufficiently: a cabin or an RV, solar, a well or rainwater, a composting toilet. A homesteader is focused on producing food: livestock, a market garden, and the right to keep animals, often while staying grid-tied. Tennessee's rules matter to both, which is why this guide covers zoning and building codes alongside water, septic, and right-to-farm.

The opt-out building-code roster is re-adopted on a 180-day cycle and the lists change, so verify your county on the State Fire Marshal’s page before relying on it.

Sources: T.C.A. §§ 13-7-101, 68-120-101, 68-126-406, 43-26-103, 69-10; TDEC Rules 0400-48-01 (septic), 0400-45-9 (wells); TN State Fire Marshal Residential Jurisdictions list (Oct. 2025); MTAS opt-out guidance (2025); Anderson and Sullivan county zoning resolutions; development cost ranges from the GoOffGrid scoring engine.