Building permits, zoning and land rules in Simpson County, Kentucky

Yes. Unincorporated Simpson County requires a building permit before excavation, construction, moving, additions or structural alterations begin; applications require a scaled plan plus health-officer and state-plumbing documentation¹. The residential process includes foundation, framing and final inspections, and occupancy or use requires a certificate of occupancy^1,5. Simpson County specifically references the Kentucky Residential Code standard for post-and-frame structures, but the complete code coverage was not confirmed from the published material⁶. Recurring maintenance, exempt buildings and uses, and required improvements installed under an approved subdivision plat are exceptions to the county permit and occupancy-certificate requirement¹. The county permits page links a fee schedule, but current amounts were not available; ask Planning and Zoning for the applicable fee^6,7.

Simpson County Planning and Zoning is the building and zoning office: call 270-586-3356 or visit 100 Courthouse Sq, Franklin, KY 42134⁶. The county publishes online applications, residential and commercial permit packets, development-plan materials and inspection requests¹. Applicants can apply and pay online, then contact the office for an invoice⁸. For county-road access, contact the Simpson County Road/Public Works Department at 270-586-4294, 2724 Kenneth Utley Drive, Franklin, KY 42134⁹. A proposed entrance onto a county-maintained road needs inspection and approval before installation, even when the owner installs it¹⁰. A new private farm or single-family driveway onto a state highway instead requires a written application to the Kentucky Department of Highways district engineer¹¹.

Yes. Simpson County's zoning regulations cover the unincorporated county and also apply in the City of Franklin; check other incorporated municipalities separately¹. The published districts include agricultural, residential, manufactured-home, business and industrial classifications, and the RV district is closed to new additions or expansions¹. Minimum lot size, lot coverage, height and setbacks depend on the district and sewer service: AG and RV lots using septic require one acre, while an R-1 lot requires 12,500 square feet with public sewer or one acre with septic¹. The RV district caps structures and impervious areas at 30% coverage¹. Dividing land for eventual lot development triggers subdivision rules in addition to zoning¹. The agricultural exemption has parcel-size, exclusive-use, setback and floodplain conditions¹. No general minimum dwelling size was confirmed; ask Planning and Zoning to identify the parcel's district before design⁶.

The Barren River District Health Department administers onsite sewage work in Simpson County². Local inspectors perform the site evaluation and inspection, and a certified Kentucky onsite septic installer must install the system based on that evaluation³. A homeowner installing a personal system must obtain a homeowner's permit through the local health department³. About 69.1% of Simpson County soils are rated without severe limits for a conventional drain field, but the parcel still needs its own evaluation¹². Where public water and sewer mains are reasonably accessible, buildings governed by county zoning must connect to them; health-department approval of proposed or completed water and sewage facilities also accompanies building-permit and occupancy applications¹.

Simpson County limits RV occupancy in permitted recreational-vehicle parks: an RV cannot serve as the primary residence there for more than 60 days, and it cannot be an incidental or accessory structure to a residential or commercial use¹. That rule does not affirmatively authorize RV living elsewhere on private land, so ask Planning and Zoning before relying on an RV during construction^1,6. We could not confirm a distinct tiny-home occupancy rule or general minimum dwelling size. Present a tiny home as a dwelling proposal subject to the building permit, zoning district and certificate-of-occupancy process¹. R-5 manufactured-home parks and subdivisions require at least five spaces or lots on an initially developed area of at least five acres, with no more than 12 homes per net developed acre¹.

1. Ask Planning and Zoning to confirm the parcel's district, allowed dwelling type, minimum lot size, setbacks, lot coverage and height limit¹.
2. Have the Barren River District Health Department evaluate the site and obtain the septic permit^2,3.
3. Confirm whether accessible public water and sewer mains require connection¹.
4. Submit the scaled plan and required health and plumbing documents through the published permit process, then ask Planning and Zoning for the fee shown by the county's linked schedule^1,7,8.
5. If doing your own plumbing, apply before work begins and file the required affidavit; this homeowner permit does not waive the county building permit⁴.
6. Secure road-entrance approval from the county or state authority before installation^10,11.
7. Request foundation, framing and final inspections, complete the septic inspection, and obtain the certificate of occupancy before moving in^1,3.

Start with zoning, septic, utilities, flood exposure and access. The parcel's district controls uses and dimensions, while dividing land for eventual development adds subdivision review¹. County flood-control and drainage rules apply alongside zoning to development or redevelopment involving rivers, streams or other bodies of water, and development in an identified floodplain also needs state and local permits^1,13. A county-road entrance needs approval before installation¹⁰. About 91.1% of county land has a slope of 15% or less, and about 69.1% of soils are rated without severe limits for a conventional drain field¹². The effective property-tax rate is about 0.6%, with a $1,246 median annual bill¹².