Marshall County, Kentucky requires building permits and inspections for residential and commercial construction12. Unincorporated Marshall County has no county zoning, while Benton and Calvert City have municipal zoning requirements3. Septic permits go through the Marshall County Health Department4.
At a glance
- Building permit
- Required for residential and commercial construction countywide1
- Building office
- Marshall County Building Office in Benton5
- Zoning
- No county zoning on unincorporated land; Benton and Calvert City have city zoning3
- Septic permit
- Required through the Marshall County Health Department46
- RV and camping
- No county zoning restriction on unincorporated land; health, floodplain and other rules still apply78
- Tiny or manufactured home
- No county zoning restriction on unincorporated land; building and septic rules still apply910
- Floodplain development
- State and county floodplain permits are required in a Special Flood Hazard Area11
- Private well
- No owner-applied permit or fee; use a Kentucky-certified water-well driller12
Who to call
Building permits
Marshall County Building Office
Building permits, plan reviews and construction inspections in Benton, Calvert City, Hardin and Marshall County
1101 Main Street, Ste. 205, Benton, KY 42025
Septic permits
Marshall County Health Department
Onsite wastewater site evaluations, permits, inspections and homeowner septic-install permits
267 Slickback Rd. | Benton, KY 42025
Floodplain permits
Marshall County Information Technology — Floodplain Management
Floodplain determinations and local Marshall County floodplain permits
1101 Main Street, Benton, KY 42025
Contact details are copied from each office’s official page and were checked against it on October 7, 2026.
Off-grid gear
Going off-grid in Marshall County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Marshall County, Kentucky?
Yes. Marshall County requires a building permit for residential and commercial construction throughout the county1. The Marshall County Building Office enforces the Kentucky Building Code and Kentucky Residential Code and inspects construction in Benton, Calvert City, Hardin and the county132. Published fees depend on project type and size, and fees must be paid before a permit to begin work is valid14. The county does not publish a general owner-builder exemption from its building-permit requirement. Kentucky allows an owner who owns and occupies the property to perform covered HVAC work without an HVAC license, but an initial HVAC system still requires an HVAC permit and inspection15.
Who is the Marshall County building department, and how do you reach it?
The Marshall County Building Office issues building permits, reviews plans and conducts construction inspections for Benton, Calvert City, Hardin and the rest of Marshall County5. The office is at 1101 Main Street, Ste. 205, Benton, KY 42025, and the phone number is 270-527-47445. Arrange a meeting by telephone because field duties can affect staff availability16. The published application calls for project, construction and contact information, plus one paper plan set and a digital copy17. Ask the Building Office for the inspection sequence and final occupancy requirements before work begins; Marshall County's published materials do not confirm a countywide certificate-of-occupancy procedure.
Does Marshall County have zoning?
Unincorporated Marshall County has no county zoning regulations or county zoning districts1819. County zoning therefore sets no minimum dwelling size, minimum lot size, setbacks, lot-coverage cap or building-height limit on unincorporated land2021222324. Building-code, septic, floodplain, subdivision, deed and road-access requirements can still constrain a project. Benton and Calvert City have their own zoning requirements, and a zoning permit or letter of compliance must accompany the building-permit application where municipal zoning applies3. Confirm the parcel's jurisdiction before relying on the unincorporated-county answer.
How do septic permits work in Marshall County?
The Marshall County Health Department administers local onsite wastewater evaluations, permits and inspections425. Obtain the septic construction permit after the site evaluation and before installing or altering the system26. Each lot in a subdivision that will use onsite sewage must be evaluated individually; a proposed cluster system also requires documents providing for perpetual ownership, operation and maintenance27. Installed, constructed, altered or repaired systems require inspection before backfilling, subject to the regulation's installer-affidavit procedure28. A homeowner may obtain a permit to install their own system, but the Health Department limits homeowner permits to once every five years25. Only about 1.5% of county soils are rated without severe limits for a conventional drain field, so make septic feasibility a purchase contingency29.
Can you live in an RV or tiny home on your land in Marshall County?
County zoning does not restrict RV occupancy, temporary camping, tiny-home occupancy, manufactured-home occupancy or accessory dwellings on unincorporated Marshall County land7891030. That answer is limited to county zoning; building, septic, health, floodplain, subdivision, deed and utility rules can still apply. A tiny home used as a dwelling remains subject to Marshall County's building permit, inspections and residential code1213. Benton and Calvert City have municipal zoning, so ask the relevant city before placing or occupying an RV, tiny home, manufactured home or accessory dwelling there3.
Building a home in Marshall County: the steps, in order
- Confirm whether the parcel is unincorporated or inside Benton or Calvert City; municipal projects need the applicable zoning permit or compliance letter with the building application31.
- Check the flood map; development in a Special Flood Hazard Area requires both Kentucky and Marshall County floodplain permits11.
- Arrange the onsite evaluation with the Marshall County Health Department and obtain the septic construction permit426.
- Submit the building application, one paper plan set and a digital copy to the Marshall County Building Office17.
- If a new driveway enters a state highway, submit a written application to the Kentucky Department of Highways District Engineer32.
- Schedule construction inspections with the Building Office and have the septic system inspected before backfilling228.
What should you check before buying land in Marshall County?
Start with septic feasibility because only about 1.5% of Marshall County soils are rated without severe limitations for a conventional drain field29. Check flood status because development in a Special Flood Hazard Area requires both state and county permits11. For a private well, budget for a Kentucky-certified water-well driller; the owner does not file a separate private-well permit application or pay a permit fee, but the driller must submit the required documentation12. Confirm legal road access and ask the road owner about driveway approval; a driveway entering a state highway requires written application to the District Engineer32. If land was recently divided, verify plat and onsite-sewage approval because each proposed septic lot must be evaluated individually27.
Watch-outs
- No general owner-builder exemption from Marshall County's building permit was confirmed; the homeowner permit offered by the Health Department applies to septic installation25.
- Benton and Calvert City have municipal zoning even though unincorporated Marshall County has no county zoning regulations3.
- Only about 1.5% of Marshall County soils are rated without severe limitations for a conventional drain field, so obtain a site evaluation before fixing the house location2925.
- Development in a Special Flood Hazard Area needs both a Kentucky floodplain permit and a Marshall County floodplain permit11.
Sources
- Building Office | Marshall County, KY, quoted and re-checked
- Building Office | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Marshall County KY Health Department Septic Systems (2026 county census)
- Marshall County Building Office (marshallcountyky.gov)
- Kentucky Revised Statutes - Chapter 211, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Information Technology – Floodplain Management, quoted and re-checked
- Water Well Information for Home Owners | Kentucky Energy and Environment Cabinet, quoted and re-checked
- Building Office | Marshall County, KY, quoted and re-checked
- Ordinance #2025-06 – Building Plan Review & Inspection Fees, quoted and re-checked
- KRS 198B.674 — Exemptions (Kentucky statewide rule), quoted and re-checked
- Building Office, quoted and re-checked
- Building Plan & Permit Application, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Marshall County Health Department (marshallcohealthdepartment.com)
- 902 KAR 10:110. Issuance of on-site sewage disposal system permits (Kentucky statewide rule), quoted and re-checked
- 902 KAR 10:085 Kentucky on-site sewage disposal systems, quoted and re-checked
- 902 KAR 10:085. System Installation Inspection (Kentucky statewide rule), quoted and re-checked
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Zoning Compliance | Marshall County, KY, quoted and re-checked
- Building Office | Marshall County, KY, quoted and re-checked
- 603 KAR 1:020 Driveway approaches, entrances; construction and maintenance (Kentucky statewide rule), quoted and re-checked
Written October 7, 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.