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

Yes. Unincorporated Rutherford County requires a permit before covered construction, enlargement, alteration, repair, movement, demolition, occupancy changes, or regulated trade work begins¹. The county uses the 2024 family of International Codes for applicable projects⁸. A qualifying agricultural structure is exempt from building permits and related fees when the property has at least 5 acres, has an established agricultural use, and the structure is used exclusively for agriculture; a Certificate of Zoning Compliance must still go to Building Codes⁹. Property owners may obtain their own permits for minor projects, but then act as permit holder and contractor and are solely responsible for requesting and completing inspections⁵. Inside Smyrna, the town issues building permits; TDEC still handles septic systems where public sewer is unavailable^10,11.

The Rutherford County Building Codes Department is at 1 South Public Square, Room 101, Murfreesboro, TN 37130; call 615-898-7734¹². The office is open Monday through Friday from 8:00 a.m. to 4:30 p.m. and issues no permits after 4:15 p.m¹².. Planning and zoning questions go to Rutherford County Planning & Engineering at 1 South Public Square, Room 200, Murfreesboro, TN 37130; call 615-898-7730⁴. The residential building-permit schedule charges $0.70 per square foot under beam for a new dwelling or added living space⁶. Zoning compliance costs $250 for a new principal residence, addition, or accessory dwelling unit and $150 for a detached accessory structure, subject to posted changes and stated waivers⁹. The applicant must request inspections and obtain approval before continuing to the next construction phase; building inspections are included in the building-permit fee, but plumbing, gas, electrical and mechanical inspections are separate⁵. Move-in requires a Certificate of Occupancy from Building Codes¹.

Rutherford County zoning governs structures and land uses in unincorporated areas². Murfreesboro, Smyrna and La Vergne administer their own zoning^13,14,15. TDEC remains the septic authority for properties in those cities using septic systems rather than public sewer^11,16,17. Eagleville also has its own zoning ordinance¹⁸. County zoning districts are established through the ordinance and official zoning map, with district-specific lot sizes, setbacks, heights and coverage limits^2,19. The AR district has a 5-acre minimum lot area; RL requires 1 acre and RM requires 15,000 square feet, subject to applicable exceptions¹⁹. RL and RM have a 35-foot maximum building height¹⁹. A detached accessory dwelling unit must contain at least 300 square feet; that is not a general minimum for principal homes². Ask Planning & Engineering to confirm the parcel’s district and applicable exceptions before designing⁴.

The Tennessee Department of Environment and Conservation administers subsurface sewage disposal permitting in Rutherford County^3,20. Installing or repairing a septic system requires TDEC construction permitting, while projects on C.U.D. STEP or Murfreesboro city sewer must provide the applicable provider's verification before county permit issuance^3,21. Planning directs applicants to obtain the septic map or permit first, then a Certificate of Zoning Compliance, before taking the documents to Building Codes⁴. A new conventional permit costs $400 for design flow up to 1,000 gallons per day, while a new alternative permit costs $500 at that flow¹¹. The installer must notify TDEC after installation, and the system must receive a final inspection before it is covered¹⁶. Only 16.2% of Rutherford County soils are rated without severe limits for a conventional drain field, so settle the septic path early²².

Rutherford County prohibits occupying an RV outside an approved campground except in narrow circumstances¹. Visiting relatives or invited guests may occupy one RV or camping trailer on a residential lot for no more than 14 days in a calendar year¹⁹. Disaster displacement or construction of an unoccupiable principal residence can qualify for a 6-month temporary-use permit, with one additional 6-month period possible; approved water, sewer, and electric service is required, and construction occupancy also requires a valid building permit¹. Rutherford County defines a tiny house as 400 square feet or less, excluding lofts⁷. A site-built tiny house needs a permanent foundation, an approved septic system, and compliance with the applicable residential code appendix; a pre-manufactured unit needs the state modular-building label⁷. Planning approval and a building permit are required before placement⁷.

1. Confirm the zoning district, dimensional rules, proposed use, and any subdivision review with Planning & Engineering^2,4,19,23.
2. Obtain the TDEC septic map or permit, C.U.D. STEP verification, or city-sewer verification that applies to the parcel^4,21.
3. Obtain a Certificate of Zoning Compliance from Planning & Engineering⁴.
4. Take the required documents to Building Codes and pay before review^4,12.
5. Request and pass inspections at the required construction stages⁵.
6. Obtain the Certificate of Occupancy before moving in¹.
7. Check driveway placement and culvert sizing with Engineering and the Highway Department; single-family and duplex driveway openings must be at least 2 feet from an adjoining interior lot line, and culvert pipes must be at least 15 inches unless Engineering requires more². A concrete or asphalt driveway needs no building permit unless its slab is intended as a foundation for a future project or structure¹. A driveway on state highway right-of-way also needs a TDOT permit²⁴.

Confirm whether the parcel is in unincorporated Rutherford County or a municipality, then verify its zoning district, minimum lot area, setbacks, lot-coverage cap, height limit, legal access, and subdivision status before treating it as buildable^2,19,23. Test the septic path early because only 16.2% of Rutherford County soils are rated without severe limits for a conventional drain field²². Ask Planning & Engineering whether the parcel lies in a mapped flood-hazard area; the ordinance imposes specific elevation rules on manufactured homes in mapped flood zones^4,19. The terrain is generally gentle, with 91.7% of land at a slope of 15% or less, while 53.8% is wooded²². We could not confirm the private-well permit rule; ask TDEC’s Division of Water Resources which well approvals apply before closing²⁵.