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

Yes. Polk County requires a building permit for construction outside municipal limits and publishes a $25 county fee¹. Construction inside city limits uses the appropriate city hall’s permit process instead¹.

Polk County is listed as having opted out of Tennessee’s state residential building program². That opt-out does not cancel Polk County’s separate building-permit requirement, and the available sources do not establish whether the county has adopted its own residential code^1,2. Ask the Assessor of Property which plans and building inspections apply to the proposed structure because a complete county inspection schedule could not be confirmed.

For construction outside municipal limits, apply through the Polk County Assessor of Property at 6239 Highway 411, Room 209, Benton, Tennessee¹. The county building-permit fee is $25, although the published information does not identify any additional permit or inspection charges¹.

A new E-911 address is required before a new electrical meter can be installed¹. Before an electrical inspector processes new service, written notice must also show that the property has public sewer, that a septic permit has been applied for, or that an existing septic system will be used⁸. Inside a municipality, contact the appropriate city hall for its building-permit process; TDEC remains the septic contact for Polk County^1,3.

We could not confirm a current countywide zoning ordinance or zoning map for unincorporated Polk County. The county’s verified subdivision regulations still control land divisions in the Polk County planning region, and subdivision plats need Planning Commission approval before recording⁴.

For subdivision lots without both public water and sanitary sewer, the minimum is three-quarters of an acre or 32,670 square feet, unless the county health authority requires more⁷. With public water and individual septic, the general minimum is one-half acre or 21,780 square feet; with public water and sewer, it is 12,000 square feet⁷. In the absence of a zoning ordinance, covered subdivision lots generally use a 25-foot front setback and a 15-foot rear setback, with separate side and conservation-subdivision standards⁷. These are subdivision standards, not proof of setbacks for every existing parcel.

TDEC’s Division of Water Resources handles Polk County septic permits and inspections³. A septic permit is required to construct, modify or repair a system, and approval should come before dirt work or construction of the building pad⁵. TDEC performs a final inspection before the system is covered and issues a Certificate of Completion when the installation is approved³.

Only 12.5% of Polk County soils are rated without severe limitations for a conventional drain field, so arrange the soil and site work early⁹. A septic-related Subdivision Evaluation requires a survey and a soils map prepared by a Tennessee-licensed soils consultant when land is divided for development using septic; divisions in which every tract is at least 5 acres are excluded from that particular definition⁸.

Polk County’s permit contact handles mobile home/RV permits outside municipal limits, but we could not confirm whether long-term RV occupancy or temporary camping is allowed on an individual private parcel¹. Ask the Assessor of Property about the proposed parcel and use before buying or moving an RV onto the land.

We also could not confirm a special tiny-home occupancy rule or a minimum dwelling floor area. A tiny home built as a residence still falls within Polk County’s stated building-permit requirement for construction outside municipal limits¹. If the project creates subdivision lots, the county’s lot-area, width and conditional setback standards can apply even though no minimum dwelling size was confirmed⁷.

1. Confirm whether the parcel is outside municipal limits; county construction uses the Assessor of Property, while construction inside city limits uses the appropriate city hall¹.
2. If land will be divided, obtain the required Planning Commission approval before recording the plat⁴.
3. Apply to TDEC for septic approval before dirt work or building-pad construction⁵.
4. Secure a new E-911 address and the written sewer-or-septic documentation needed for a new electrical meter^1,8.
5. Obtain the county building permit and pay the published $25 fee¹.
6. Arrange TDEC’s final septic inspection before covering the system³.

An owner may build one residence for personal use once every two years if it is not for resale, lease or rent; hired work of $25,000 or more remains subject to contractor-licensing requirements⁶.

Start with the parcel’s buildable area and wastewater plan. Only 12.5% of county soils are rated without severe limits for a conventional septic drain field, and 26.2% of the land has a slope of 15% or less⁹. Those countywide measures do not decide one site, but they make early soil evaluation and careful placement of the house, driveway and drain field worthwhile.

For a proposed subdivision, confirm the applicable lot size, setbacks, plat approval and utility layout with the Planning Commission^4,7. A subdivision within a public-water service area or within 500 feet of a public water system, whichever is more stringent, must install public water to serve its lots⁷. Private-well requirements and parcel-specific floodplain rules could not be confirmed. Polk County’s effective property-tax rate is about 0.6%, and the median annual property-tax bill is $770⁹.