Unincorporated Montgomery County, Tennessee requires a building permit for a home through Montgomery County Building and Codes1. The county enforces adopted building codes, requires construction inspections and requires a Certificate of Occupancy before the home is occupied234. County zoning also applies, while septic permits come from the state56.
At a glance
- Building permit
- Required for a home, issued by County Building and Codes1
- Zoning
- Yes, a County Zoning Resolution for the unincorporated area5
- Septic permit
- State permit through TDEC, not a county permit6
- Owner-builder exemption
- Conditional: one residence every two years for the owner's own use7
- Inspections
- Required at specified stages of permitted construction3
- Minimum home size
- Varies by district and dwelling type; the published mobile-home minimum is district-specific8
- Certificate of Occupancy
- Required before occupying county-permitted construction4
Who to call
Building permits
Montgomery County Building and Codes
Building, pool, sign, deck and other construction permits, plan review and inspections for unincorporated Montgomery County, and collection of the Adequate Facilities Tax
350 Pageant Lane, Suite 309, Clarksville, TN 37040
Planning & zoning
Clarksville-Montgomery County Regional Planning Commission
Zoning recommendations, rezoning cases and minor-plat review for unincorporated Montgomery County
329 Main Street, Clarksville, TN 37040
Roads & driveways
Montgomery County Highway Department
Road bonds and driveway connection approval for driveways onto Montgomery County roads, required before Building and Codes will issue a building permit
1213 Highway Drive, Clarksville, TN
Septic permits
TDEC Environment Groundwater Office (Subsurface Sewage Disposal Systems)
Septic (SSDS) permitting for Montgomery County, per the county's own referral to the state office
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Montgomery County, Tennessee?
Unincorporated Montgomery County requires a building permit for a home through Montgomery County Building and Codes1. The department's permit list covers single-family homes, additions, mobile homes, barns, sheds, renovations and several other projects9. The county adopted the listed 2018 International Codes and began enforcing that edition in 2021 within its jurisdiction outside cities2. Permitted work must pass inspections at specified construction stages, and the permit holder is responsible for scheduling them3. After all required inspections pass, a Certificate of Occupancy must be requested and issued before anyone occupies the home4. An owner may build one residence every two years for personal use, but not for resale, lease or rent; a hired prime contractor or construction manager is not covered by that exemption for work of $25,000 or more7.
Who is the Montgomery County Building and Codes Department, and how do you reach them?
Montgomery County Building and Codes issues residential permits and administers inspections in the county jurisdiction outside cities13. Reach the department at 931-648-5718 or visit 350 Pageant Lane, Suite 309, Clarksville, TN 37040, Monday through Friday from 7:30 a.m. to 4:30 p.m9. County permits must be issued to the property owner or a licensed contractor and paid in full by check or cash when issued; applicants receive an inspection checklist and use their application number when requesting inspections10. Before issuance, the county may require site-plan review or evidence of proper sewage disposal10. The county's published checklist also calls for septic documentation, a road-bond copy and an Adequate Facilities Tax receipt marked "Paid in Full" where applicable9.
Does Montgomery County have zoning?
Montgomery County's zoning resolution applies outside Clarksville's corporate boundaries and publishes separate standards for estate, mobile-home, residential, office and commercial districts511. That district matters: minimum lot size, setbacks, lot coverage and building height vary by zoning district and use12131415. The published minimum floor area of 480 square feet applies specifically to mobile homes in the RM-1 and RM-2 districts, not to every dwelling countywide8. The joint Clarksville-Montgomery County Regional Planning Commission makes rezoning recommendations for city and county land16. Before buying or designing, ask the Commission to identify the parcel's district and applicable table, exceptions and overlays; reach it at 931-645-7448, [email protected], or 329 Main Street, Clarksville, TN 3704016.
How do septic permits work in Montgomery County?
Septic permits in Montgomery County come from the Tennessee Department of Environment and Conservation rather than the county6. A Septic System Construction Permit is required before installing a new system or repairing a faulty one, and larger conventional or alternative systems may require a licensed engineer's design17. Montgomery County Building and Codes directs applicants to the Environment Groundwater office at 615-687-7000 for the septic permit18. State review generally takes about 10 days and must be completed within 45 days; the conventional-system fee is $400 for up to 1,000 gallons per day, with $100 for each additional 1,000 gallons per day17. Only 34.1% of county soils are rated without severe limits for a conventional drain field, so make septic feasibility an early purchase contingency rather than assuming acreage alone makes a lot buildable19. We could not confirm the county-specific septic inspection sequence; ask TDEC when applying.
Can you live in an RV or tiny home on your land in Montgomery County?
We could not confirm a Montgomery County rule that allows residential or long-term RV occupancy on private land, so ask the Regional Planning Commission before planning to live in an RV while building. County zoning applies in the unincorporated area, and allowed uses and dimensional standards depend on the parcel's district511. We also could not confirm a separate tiny-home occupancy rule. A very small unit is not automatically exempt from zoning or permitting: the published 480-square-foot minimum applies only to mobile homes in the RM-1 and RM-2 districts8. Mobile homes in those districts also have district-specific lot size, setback, lot-coverage and height standards12131415. Building and Codes lists mobile homes among projects requiring its permit process9.
Building a home in Montgomery County: the steps, in order
- Ask the Regional Planning Commission to confirm the parcel's zoning district, development table, overlays and whether plat review is needed511.
- Apply to TDEC for the septic construction permit, or document proper sewage disposal for Building and Codes61710.
- For access from a county road, obtain the Highway Department road bond; for a state-highway driveway, contact the state highway office2021.
- Pay the Adequate Facilities Tax and obtain a receipt marked "Paid in Full"9.
- Have the property owner or licensed contractor obtain and pay for the building permit, then keep the inspection checklist and application number10.
- Schedule each required inspection as work advances, correct any rejected work, and request the Certificate of Occupancy only after all required inspections pass34.
What to check before you buy land in Montgomery County
Start with zoning and septic feasibility. Montgomery County's minimum lot size, setbacks, lot coverage and height are district-specific, and an on-lot septic system may trigger a 20,000-square-foot minimum lot standard12131415. Only 34.1% of county soils are rated without severe limits for a conventional drain field, so obtain a site-specific septic evaluation before closing19. Confirm whether access meets the county road-bond process or needs a TDOT state-highway entrance permit2021. Agricultural buildings may qualify for a county-zoning exemption only when the land and structure meet Tennessee's conditions, and the exemption does not apply in the listed highway, airport, park or floodplain situations22. Finally, budget for the Adequate Facilities Tax and property taxes; the median annual property-tax bill is about $1,671 at an effective rate near 0.7%92324.
Watch-outs
- Do not treat the published 480-square-foot mobile-home minimum as a countywide tiny-home rule; it applies specifically in the RM-1 and RM-2 districts8.
- We could not confirm a published Montgomery County rule on RV or tiny-home occupancy; ask the Regional Planning Commission about the parcel and proposed use16.
Sources
- Montgomery County Building and Codes - Permit Types (2026 county census)
- Montgomery County Building and Codes, quoted and re-checked
- Montgomery County Department Services, quoted and re-checked
- Residential Building Permit Important Notices, quoted and re-checked
- Montgomery County Zoning Resolution (Unincorporated Area) (2026 county census)
- TDEC - Subsurface Sewage Disposal Systems (SSDS) (2026 county census)
- Residential Building Permit Important Notices, quoted and re-checked
- Zoning Resolution of Montgomery County, Tennessee, quoted and re-checked
- Montgomery County Building and Codes (montgomerytn.gov)
- Montgomery County Department Services, quoted and re-checked
- Zoning Resolution of Montgomery County, Tennessee, quoted and re-checked
- Zoning Resolution of Montgomery County, Tennessee, quoted and re-checked
- Zoning Resolution of Montgomery County, Tennessee, quoted and re-checked
- Zoning Resolution of Montgomery County, Tennessee, quoted and re-checked
- Zoning Resolution of Montgomery County, Tennessee, quoted and re-checked
- Clarksville-Montgomery County Regional Planning Commission (cmcrpc.com)
- Septic System Construction Permit (Tennessee statewide rule), quoted and re-checked
- TDEC Environment Groundwater Office (Subsurface Sewage Disposal Systems) (montgomerytn.gov)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Montgomery County Highway Department (montgomerytn.gov)
- Highway Entrance Permits (Tennessee statewide rule), quoted and re-checked
- Exemption from County Zoning Regulation for Buildings on Land Used for Agriculture, Opinion No. 22-07 (Tennessee statewide rule), quoted and re-checked
- Median property tax bill: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.