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

Yes. Residential, commercial and industrial construction in unincorporated Smith County requires a building permit before work begins, and the permit must conform to the zoning resolution unless the Board of Zoning Appeals provides the required written order¹. Smith County's development guide specifically requires a state building permit for new construction and decking on mobile homes⁶. Tennessee has adopted the International Building Codes for permit applicants³. A qualifying owner may obtain one permit every two years to build a home for personal use, not for sale, lease or rent; hired contractors remain subject to the stated licensing rules⁸. The Land Use Regulations Administrator conducts zoning-compliance inspections, but a complete construction-inspection schedule is not published¹. Agricultural buildings and other nonresidential structures on agricultural land have a conditional exemption, with stated exceptions for certain feedlots, dairy farms and egg-production houses¹.

The Smith County Planning Office is the building-permit and zoning contact for property outside the three city limits². Inside a city, confirm building-permit and zoning requirements with that municipality; TDEC still administers septic permits for Smith County property². The Planning Office is at 303 High Street N, Carthage, Tennessee 37030; call 615.735.3418 or email planning@smithcountytn.gov². The current application lists building-permit fees of $1,505 for residential, $1,605 for commercial and $2,005 for industrial work³. The application asks for property, occupant, contractor, site and project information; ask the Planning Office which zoning-compliance inspections to schedule^1,2,3.

Yes. Smith County zoning regulates land and buildings outside the three city limits; incorporated municipalities may administer their own zoning rules¹. The county publishes requirements for the A-1, R-1, R-C, C-1, C-2 and I-1 districts, which vary by district and fire protection⁶. With adequate fire protection, A-1 lots require at least 1 acre, while R-1 and R-C lots require 30,000 square feet⁶. Published front setbacks range from 30 to 50 feet and rear setbacks from 15 to 30 feet, depending on district and fire protection; the front measurement starts at the right-of-way edge⁶. Manufactured homes are allowed on individual lots in the R-1 district, subject to its building-permit, septic, area, setback and other zoning requirements¹. A subdivision plat is required when land is divided into tracts or lots smaller than 5 acres⁶.

TDEC, not Smith County or its cities, administers septic permits for Smith County property². Obtain the septic permit before dirt work, construction or preparation of the building pad begins⁴. The TDEC Cookeville Environmental Field Office serves Smith County and lists 931-206-6329 for septic inquiries⁹. A septic permit or Certificate of Verification for an existing system is also part of the county building-permit application⁶. TDEC inspects each septic installation, and the final inspection must occur before the system is covered¹⁰. Only about 3.6% of Smith County soils lack severe limitations for a conventional drain field, so settle septic feasibility and the home site before closing or beginning earthwork⁷.

We could not confirm a countywide rule allowing or prohibiting RV occupancy on an individual parcel in unincorporated Smith County. Smith County regulates campgrounds, incidental camping areas and RV parks, but those standards do not establish permission to live in an RV on a private lot¹. Tiny-home occupancy and a countywide minimum dwelling floor area also remain unconfirmed. Ask the Smith County Planning Office for a written answer tied to the parcel, zoning district, unit and intended occupancy². Manufactured homes are expressly allowed on individual lots in the R-1 Rural Residential District, subject to its building-permit, septic, area, setback and other zoning requirements¹.

1. Ask the Smith County Planning Office to identify the zoning district and confirm the use, lot area, setbacks and floodplain status^2,6.
2. Confirm that the building lot has the required public-road frontage: generally 50 feet, or 30 feet for qualifying residential or agricultural property on a cul-de-sac⁶.
3. Obtain the TDEC septic permit before dirt work, building-pad preparation or construction, then include the permit or existing-system verification with the building-permit application^4,6.
4. Apply for the building permit through the Planning Office with the requested property, occupant, contractor, site and project details; new construction and mobile-home decking require a state building permit^2,3,6.
5. Schedule the required zoning-compliance inspections, and arrange TDEC's final septic inspection before the system is covered^1,10.
6. For a county-road culvert or tile, have the Road Superintendent evaluate the location and required tile size; for state highway right-of-way, obtain a TDOT driveway permit^11,12.

Inspect the zoning map with the Land Use Regulations Administrator and confirm the parcel's district, allowed use, minimum lot area, setbacks and FEMA floodplain status before relying on a listing's description of buildability^2,6. If the seller proposes a split, ask whether a subdivision plat and Planning Commission review are required; divisions into tracts or lots smaller than 5 acres require a plat⁶. Test septic feasibility early because only about 3.6% of county soils lack severe limitations for a conventional drain field⁷. Confirm public-road frontage and have the Road Superintendent size any county-road driveway tile before installation^6,11. We could not confirm one countywide private-well or utility-connection rule, so ask Planning and TDEC about the parcel^2,9.