McLean County, Kentucky requires a building permit and has adopted zoning, so call the county Planning and Zoning Commission before designing or placing a home on a parcel.12 A private septic system requires local health-department review and a permit before construction.34
At a glance
- Building permit
- Required by McLean County1
- Zoning
- Yes; confirm the parcel's district and allowed use2
- Septic
- Permit and inspection required through the local health department345
- RV living
- Long-term private-land occupancy was not confirmed; ask Planning and Zoning2
- Tiny home
- County-specific occupancy and minimum-size rules were not confirmed2
- Owner-builder
- No county-specific building exemption was confirmed; homeowners may obtain their own plumbing permit for a personal residence6
- Private well
- No owner permit or fee, but a Kentucky-certified well driller must do the work78
Who to call
Planning & zoning
McLean County Planning and Zoning Commission
Building-permit applications, zoning questions and county zoning maps
210 Main Street, P.O. Box 127, Calhoun, KY 42327
Septic permits
McLean County Health Department
Local environmental-health contact for onsite sewage and septic routing
McLean County Health Department 200 West Highway 81 North Calhoun, KY 42327
Contact details are copied from each office’s official page and were checked against it on September 28, 2026.
Do you need a building permit in McLean County, Kentucky?
Yes. McLean County requires a building permit under the county zoning ordinance's administration-and-enforcement provisions and provides a building-permit application through the Planning and Zoning Commission.1 Kentucky's residential code otherwise says permits, inspections and certificates of occupancy are not required for a single-family dwelling unless a local ordinance requires them; McLean County's local requirement is therefore the controlling starting point here.9
Kentucky uses a mandatory statewide residential code for single-family dwellings, two-family dwellings and townhouses, with Kentucky amendments superseding conflicting provisions of the underlying residential code.10 A building permit is not the only approval a project may need: plumbing work requires a plumbing construction permit, and a project in an identified floodplain requires both state and local floodplain permits.611
Who handles McLean County building permits and inspections?
Start with the McLean County Planning and Zoning Commission for the building-permit application, zoning ordinance and zoning maps; the county page lists the commission at the courthouse and gives its permit contact number.12 The application decision should come before construction scheduling because Kentucky's statewide code makes the local ordinance decisive for permits on a single-family dwelling.9
Separate technical inspections may involve state or trade inspectors. The county maintains a County Inspectors page covering building, electrical, manufactured-housing, HVAC, plumbing and environmental-health contacts.13 Plumbing construction or alteration requires a Division of Plumbing permit, which may be issued to a licensed master plumber or to a homeowner working on the homeowner's own personal residence.6 Ask Planning and Zoning which inspections and certificate-of-occupancy steps attach to the exact structure and parcel before hiring trades.
Does McLean County, Kentucky have zoning?
McLean County has adopted zoning administered through its Planning and Zoning Commission.2 The county publishes zoning maps and directs permit applicants through the Planning and Zoning Commission.12 An official Island map shows agricultural, commercial, industrial and several residential categories, but that Island-specific evidence should not be treated as the district schedule for every parcel in McLean County.1415
Get the parcel's mapped classification before assuming a home, accessory structure or business use is allowed. We could not confirm countywide rules for setbacks, minimum lot size, minimum dwelling size, lot coverage or building height. The same gap applies to a county-specific agricultural exemption from building or zoning rules. Ask Planning and Zoning for the provisions tied to the parcel's district and whether an incorporated city's rules apply at the address. Kentucky law also requires planning-commission approval before land is subdivided within a planning-unit jurisdiction.16
How do septic permits work in McLean County?
Green River District Health Department serves McLean County for onsite sewage work, including site evaluations and construction permits.3 The county's environmental-health contact is listed through the McLean County Health Department.13 Kentucky requires a permit before any portion of an onsite sewage system is constructed, installed or altered, and the permit follows a site evaluation.4 Every onsite system that is installed, constructed, altered or repaired must be inspected by a certified inspector.5
Soil is a serious due-diligence issue here: only about 4.7% of mapped soils are rated without severe limitations for a conventional septic drain field.17 That does not decide whether a particular tract will pass, but it makes an early site evaluation especially valuable before choosing a house location. Where sewer is unavailable, Kentucky plumbing rules require the building drain to connect to an approved private sewage-disposal system.18
Can you live in an RV or tiny home on land in McLean County?
We could not confirm a McLean County rule that allows long-term RV occupancy on private land, so do not treat the absence of a located rule as permission. Ask the McLean County Planning and Zoning Commission whether the parcel's district permits RV occupancy, temporary camping, a tiny home or an accessory dwelling, and what building, sanitation and utility approvals apply.12
Kentucky's rule allowing someone to sleep temporarily in a lawfully parked vehicle on a public road, street or parking lot for less than 12 hours does not authorize long-term RV living on private property.19 A tiny home used as a dwelling still encounters the statewide residential-code framework, while McLean County's specific minimum-size and tiny-home occupancy rules remain unconfirmed.10 If public sewer is unavailable, a dwelling's drain must connect to an approved private sewage system; this is not permission to use an unreviewed off-grid sanitation method.20
Building a home in McLean County: what are the steps?
- Ask the McLean County Planning and Zoning Commission to identify the parcel's zoning district, allowed residential use and applicable dimensional rules.212
- Submit the county building-permit application and confirm which building, electrical, HVAC, plumbing and occupancy inspections apply.112
- Request the onsite sewage site evaluation through the local health department before fixing the house and drain-field locations.3
- Obtain the septic construction permit before any part of the system is built, then arrange inspection before backfilling.45
- Obtain the plumbing construction permit before plumbing work begins.6
- If the driveway meets a state highway, submit a written driveway application to the Department of Highways district engineer.21
- If any development lies in an identified floodplain, secure both state and local floodplain permits before work.11
What should you check before buying land in McLean County?
Confirm zoning, permitted use and buildability with the McLean County Planning and Zoning Commission before closing.212 Make the septic evaluation an early contingency because about 4.7% of mapped soils lack severe conventional-drain-field limitations.17 Check the proposed house, driveway and septic locations against the floodplain; identified floodplain development needs both state and local permits.11
For water, Kentucky does not require the property owner to obtain a permit or pay a fee to construct or abandon a private well, but the work must be performed by a Kentucky-certified water-well driller.7 For access onto a state highway, a new farm or single-family driveway requires a written application to the Department of Highways district engineer.21 As a cost baseline rather than a quote for a specific parcel, the county's effective property-tax rate is about 0.7% and the median annual property-tax bill is about $984.2223
Watch-outs
- Do not assume an Island zoning category applies elsewhere in McLean County; confirm the parcel's own classification with Planning and Zoning.1412
- Only about 4.7% of mapped soils lack severe limitations for a conventional septic drain field, so obtain the health department's site evaluation before committing to a house location.173
- A mapped floodplain project needs both a Kentucky permit and a local floodplain permit before development.11
- Long-term RV living, tiny-home occupancy, setbacks and minimum dwelling size were not confirmed; ask Planning and Zoning about the exact parcel before buying.12
Sources
- McLean County KY - Building Permit Application (2026 county census)
- McLean County, KY Code of Ordinances - Chapter 153 Zoning (2026 county census)
- Green River District Health Department - Onsite Sewage (Septic Systems) (2026 county census)
- 902 KAR 10:110. Issuance of on-site sewage disposal system permits (Kentucky statewide rule), quoted and re-checked
- 902 KAR 10:085. System Installation Inspection (Kentucky statewide rule), quoted and re-checked
- Division of Plumbing Fee Change and Permit Information (Kentucky statewide rule), quoted and re-checked
- Water Well Information for Home Owners, quoted and re-checked
- 401 KAR 6:320. Certification of water well drillers and water well driller assistants (Kentucky statewide rule), quoted and re-checked
- 815 KAR 7:125, Kentucky Residential Code (Kentucky statewide rule), quoted and re-checked
- 815 KAR 7:125 Kentucky Residential Code, quoted and re-checked
- Find Your Flood Zone (Kentucky statewide rule), quoted and re-checked
- McLean County Planning and Zoning Commission (mcleancounty.ky.gov)
- McLean County Health Department (mcleancounty.ky.gov)
- Land Use Map — Island, KY, quoted and re-checked
- Land Use Map — Island, KY, quoted and re-checked
- KRS 100.277 — Commission approval required for subdivisions (Kentucky statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- 815 KAR 20:130. House sewers and storm water piping; methods of installation (Kentucky statewide rule), quoted and re-checked
- KRS 511.110 — Unlawful camping (Kentucky statewide rule), quoted and re-checked
- 815 KAR 20:130. House sewers and storm water piping; methods of installation (Kentucky statewide rule), quoted and re-checked
- 603 KAR 1:020 Driveway approaches, entrances; construction and maintenance (Kentucky statewide rule), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 28, 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.