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

Yes. Unincorporated Franklin County requires a building permit before construction, alteration, repair, moving, a change of use, excavation or filling governed by the county zoning resolution begins¹. The county government has not adopted a standard building code, but the county zoning permit requirement still applies^1,2. The owner or agent must contact Planning & Zoning for an initial compliance inspection after staking the proposed footing location and again when the work is complete⁸. A conforming application is to be issued a permit within 3 days, and the permit becomes void after 12 months unless substantial progress has been made⁸. Starting before the permit is issued doubles the county fee^1,9.

The Franklin County Planning & Zoning Department handles building permits and answers zoning, subdivision and floodplain questions for unincorporated Franklin County⁴. The office is at 1 South Jefferson Street, Basement Room 109, Winchester, TN 37398; call (931) 967-0981 or email ericbradford@franklincotn.gov⁴. The current county fee schedule lists $250 for a single-family home up to 1,000 square feet; larger single-family work is listed at $0.45 per conditioned square foot and $0.225 per non-conditioned square foot⁹. County fees are nonrefundable and double when work starts before the permit is obtained⁹. Winchester, Cowan, Decherd, Estill Springs, Huntland, Tullahoma and Monteagle have adopted standard building codes, so property inside those towns should start with the town rather than the county². Septic permitting stays with TDEC wherever the property sits³.

Franklin County zoning applies throughout the county’s unincorporated area, while incorporated municipalities may have separate rules⁴. Planning & Zoning maintains the district maps, so confirm the parcel’s district before relying on dimensional rules^4,8. In R-1, a dwelling lot must contain at least 20,000 square feet and be at least 80 feet wide; a non-sewer lot may need more land for sanitary disposal⁸. R-1 principal structures are capped at 3 stories or 35 feet, and all structures together may cover no more than 40% of the lot⁸. Agricultural uses and incidental buildings have a conditional exemption, but highway, airport, park, health, floodplain, septic and permit limits may still apply⁸.

The Tennessee Department of Environment and Conservation administers septic permitting in Franklin County, and a permit is required to install or repair a subsurface sewage disposal system^3,5. Apply through TDEC’s online septic portal; for assistance, contact the Columbia Environmental Field Office at 931-380-3371 or columbia.efo_adm@tn.gov¹⁰. Franklin County requires a septic permit, certificate of verification or other Tennessee-approved proof of sanitary-waste disposal before issuing the county building permit; a non-sewered subdivision lot must also reserve adequate area for a subsurface system⁸. TDEC requires the installer to notify the Division after installation and schedules the final inspection before the system is covered⁶. Only about 30.9% of county soils rate without severe limits for a conventional drain field, so establish septic feasibility before treating a homesite as buildable¹¹.

We could not confirm a complete rule for long-term RV occupancy, temporary camping or tiny-home occupancy in unincorporated Franklin County. Ask Planning & Zoning whether the proposed dwelling and occupancy are allowed in the parcel’s district before buying or moving a unit onto the land⁴. A tiny home does not bypass the general permit rule when the project involves regulated construction, moving or a change of use¹. An accessory dwelling unit must be subordinate to a single-family home, located within an accessory structure, limited to 1,000 square feet and owner-occupied in either the main home or accessory unit; mobile homes cannot serve as accessory dwelling units¹². Mobile homes are prohibited in R-1 and A-1, while other districts may differ⁸. Agricultural districts allow a residence including not more than 2 mobile homes for those owning and operating agricultural activities⁸. In a mapped Special Flood Hazard Area, an RV must be on site fewer than 180 consecutive days, be fully licensed and ready for highway use, or meet new-construction requirements⁸. A countywide minimum dwelling-floor-area rule remains unconfirmed; ask the office about the specific parcel⁴.

1. Ask Planning & Zoning to confirm that the parcel is in unincorporated Franklin County and identify its zoning district^4,8.
2. Confirm that the proposed home and lot meet district rules; any subdivision plat needs final Planning Commission approval before recording^8,13.
3. Apply to TDEC for the septic permit if the site will not use approved sewer, because the county requires sanitary-waste documentation before issuing its permit^8,10.
4. Submit the county application with a dimensional sketch or scale plan showing the buildings and intended uses⁸.
5. Obtain the county building permit before starting, since an early start doubles the fee^1,9.
6. After staking the footing location, request the initial county compliance inspection and contact Planning & Zoning again at completion⁸.
7. For a newly created access easement, obtain Planning Commission review; a driveway entering state highway right-of-way also needs a TDOT permit^13,14.

Start with the zoning district, legal access, flood status, water source and septic feasibility. Franklin County requires compliance with its Floodplain District provisions for development in a mapped special-flood-hazard area; permits and elevation or floodproofing records may be required¹⁵. Newly created access easements must also be reasonably developable as determined by the Planning Commission¹³. About 30.9% of county soils rate without severe limitations for a conventional drain field, while about 64.6% of the land has a slope of 15% or less, so evaluate the actual homesite rather than countywide averages alone¹¹. We could not confirm the private-well permit rule; ask Planning & Zoning which state office should review a proposed well⁴. The effective property-tax rate is about 0.6%, and the median annual property-tax bill is about $1,218¹¹.