Building permits, zoning and septic rules in Hardin County, Tennessee

Hardin County opted out of Tennessee's State Residential Building Code Enforcement Program, so the state does not run residential building permits for one- and two-family homes in unincorporated Hardin County¹. That opt-out does not by itself prove that no other county or specialized permit applies, and the county's department list shows no building or codes office, so ask Hardin County Government before you start². The opt-out applies to the statewide standards for one- and two-family dwellings; municipal building permit requirements can differ inside Savannah, Adamsville, Crump, Milledgeville and Saltillo^1,5. An owner or contractor may request a State Fire Marshal inspection for a home or addition in the opt-out area⁶. If the dwelling meets statewide construction safety standards, the State Fire Marshal can release a Certificate of Occupancy⁶. Tennessee's owner-builder exemption covers one residence for the owner's own use every two years, not a home for resale, lease or rent; a person hired for work costing $25,000 or more is not exempt from contractor licensing⁵.

No state residential building permit office covers unincorporated Hardin County because the county is listed as opt out, and the county's own department list has no building, codes, planning or zoning office^1,2. For parcel-specific local questions, call Hardin County Government at (731) 925-9078 or visit 465 Main Street, Savannah, TN 38372². For an optional state construction inspection, the state list gives the Hardin County opt-out contact as 731-607-6395 and savinspector@yahoo.com¹. TDEC, not the county or a town, issues septic permits and inspections for every address in Hardin County through the Jackson Environmental Field Office^3,4. A driveway built or changed within state-highway right-of-way needs a TDOT entrance permit⁷.

Hardin County is reported as having no county zoning in its unincorporated area, but we could not confirm that conclusion in an express county ordinance or no-zoning statement². Ask Hardin County Government to verify the current status for the parcel before relying on the absence of county zoning². Tennessee law authorizes counties to zone land outside municipal corporations, so a town's rules and any future county action are separate questions¹⁰. The county-zoning exemption for agricultural structures requires land devoted to agricultural uses and a structure incidental to the farm; it does not apply in the 100-year floodplain or within municipalities and has other location exceptions¹¹. Minimum home size, setbacks, lot coverage and building height remain unconfirmed for unincorporated Hardin County; ask county government about each before closing².

TDEC, not Hardin County, administers septic permits and inspections through the Jackson Environmental Field Office^3,4. A permit is required to install or repair a septic system and should be obtained before dirt work or construction of the building pad¹². Mark the property lines and house location and mow or bush hog before the site visit; TDEC may request a detailed site plan or a soils map from a licensed soil consultant, and a complete application may take up to 45 days¹². A conventional-system permit costs $400 through 1,000 gallons per day of design flow, while an alternative-system permit costs $500 at that flow; repair permits have no permit fee³. Only 17.3% of Hardin County soils are rated without severe limits for a conventional drain field, so make the site evaluation an early purchase contingency¹³. The installer must arrange final inspection before covering the system; approval produces a Certificate of Completion¹².

We could not confirm a Hardin County rule that authorizes or prohibits long-term RV living, temporary camping, tiny-home occupancy, manufactured homes or accessory dwellings on unincorporated land. The absence of a mandatory residential building permit does not answer occupancy, sanitation, floodplain or utility questions^1,14,15. Inside Savannah, occupying or servicing a travel trailer outside a properly designated travel-trailer park is prohibited; unoccupied travel-trailer storage is excepted⁸. That Savannah rule does not establish the rule for unincorporated Hardin County or another municipality. Ask Hardin County Government about the proposed use and parcel location before moving a unit onsite². A single-family domestic waste system requires a Division of Water Resources construction permit even though it does not require a UIC permit¹⁴. Before electrical service is processed, the electrical inspector needs written confirmation of public sewer service, a septic application or an existing septic system⁹.

1. Confirm that the parcel is outside a municipality and ask Hardin County Government about zoning, setbacks, floodplain status and county-road access^2,15.
2. If land will be divided for septic-served lots, submit the required TDEC subdivision evaluation, survey and soils map; the stated subdivision definition excludes divisions where every resulting tract is at least 5 acres⁹.
3. Apply to TDEC for the septic permit before dirt work or the building pad; mark the property lines and house location and prepare the site for the visit¹².
4. Obtain a TDOT entrance permit before constructing or changing a driveway in state-highway right-of-way⁷.
5. Decide whether to request the voluntary state inspection and possible Certificate of Occupancy⁶.
6. Give the electrical inspector written sewer or septic documentation before requesting electrical service, then have the septic installer schedule final inspection before covering the system^9,12.

Hardin County has 71.6% of its land at a slope of 15% or less and a 69.3% wooded share, but parcel-level terrain and clearing needs still require an onsite look¹³. Only 17.3% of county soils rate without severe limits for a conventional drain field, so make satisfactory TDEC septic approval a purchase contingency^12,13. Floodplain requirements are managed locally and may require review before construction, fill, grading, excavation or placement of a manufactured home¹⁵. The nearest city of 100,000 or more is about 91 miles from the county center, which can affect supply and service trips¹³. The typical effective property-tax rate is 0.4%, and the median annual property-tax bill is $666¹³. Confirm legal access and private-well requirements before closing; we could not confirm those parcel-specific rules.