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

A single-family building permit appears unnecessary in unincorporated Trigg County¹. Kentucky's exemptions are conditional: each approval is unnecessary only when no local ordinance requires it². We could not confirm a current Trigg County ordinance that resolves that condition, so ask the Cadiz-Trigg County Planning Commission before construction¹¹.

The Kentucky Residential Code governs single-family homes, two-family homes and townhouses even without a local inspection program; HVAC and electrical inspections still apply where no single-family building inspection program exists⁶. A qualifying farm structure outside a municipality may fall under Kentucky's agricultural building-code exclusion, but retail use, regular employment by 10 or more people, and timber-product storage or processing are excluded¹². Plumbing work requires a state plumbing permit¹³. Owner-performed plumbing for a personal residence requires advance application, an affidavit and code-compliant work personally performed by the owner; only 1 new-home homeowner plumbing permit may be issued per individual in a 5-year period^7,8. HVAC has separate homeowner-permit conditions, including system sizing and duct and piping design⁸.

We could not confirm an office issuing single-family building permits in unincorporated Trigg County; ask the Cadiz-Trigg County Planning Commission¹¹. Ask the Cadiz-Trigg County Planning Commission at 270-350-5566 or secretary@ctcplanning.com whether a local ordinance requires a building permit for the parcel^2,11. Inside Cadiz, the city Building Inspector must issue a building permit before excavation, construction, moving or alteration of buildings or accessory buildings³. Cadiz also publishes a zoning-permit application, while septic permits countywide remain with the Trigg County Health Department^1,14.

Trigg County 911 receives the required address-request form for new structures at P.O. Box 672, Cadiz, KY 42211, phone (270) 522-7445 or ljenkins@trigg911.com¹⁵. The Trigg County Road Department handles entrance culverts on county roads at the same mailing address, phone (270) 522-8377 or roadforeman@triggcounty.com¹⁶. A driveway connecting to the state highway system instead requires Kentucky Transportation Cabinet approval¹⁷.

Trigg County has no countywide zoning; inside Cadiz, city zoning districts apply and the city publishes a zoning-permit application^1,4,18. Septic permits for parcels inside and outside Cadiz remain with the Trigg County Health Department¹. Some subdivisions also have recorded deed restrictions, so a rural parcel can carry private limits even where county zoning is absent¹.

We could not confirm countywide numerical rules for minimum home size, setbacks, lot coverage or building height; ask the Cadiz-Trigg County Planning Commission¹¹. Ask the Cadiz-Trigg County Planning Commission about the exact parcel and obtain the recorded plat and deed restrictions before designing a home¹¹. Land division can trigger another layer: subdivision within a Kentucky planning-unit jurisdiction requires planning-commission approval before the plat may be recorded, while a qualifying agricultural division that creates no new street can fall outside the statutory subdivision definition^19,20.

The Trigg County Health Department administers onsite sewage locally under Kentucky's statewide program²¹. Contact the office at 196 Main Street, PO Box 191, Cadiz, KY 42211 or (270) 522-8121²². A site evaluation comes first, and the permit must be issued before any part of the onsite system is built⁵. Trigg County's local guidance says a septic building lot must be at least a half-acre¹.

After installation, the system must be inspected by a certified inspector⁵. Only 23.5% of Trigg County soils are rated “not limited” for a conventional septic drain field; the remaining soils have some degree of limitation, so a site evaluation may point to an engineered system rather than rule out septic²³. Kentucky may allow an alternative system when the proposed conventional design is not approvable, and approved composting toilets or a separated greywater system may reduce design flow; the remaining onsite system still needs approval, a permit, and inspection⁵.

We could not confirm a Trigg County rule that allows long-term RV occupancy or a tiny home as a permanent dwelling on an individual parcel outside Cadiz; ask the Cadiz-Trigg County Planning Commission¹¹. The reported absence of countywide zoning does not by itself establish that either use is lawful, and recorded subdivision restrictions may still control a specific property¹. Ask the Cadiz-Trigg County Planning Commission about zoning approval and the Trigg County Health Department about the septic permit^11,22.

In Cadiz residential districts, use of a mobile home as a dwelling or business for more than 30 days outside a licensed or approved mobile-home park is prohibited; modular homes on permanent foundations are allowed in city subdivisions subject to subdivision regulations and deed restrictions²⁴. A tiny home used as a dwelling must still satisfy the Kentucky Residential Code and approved sewage requirements^2,25.

1. Confirm whether the parcel is in Cadiz, a subdivision, or unincorporated Trigg County; obtain the plat and recorded deed restrictions where applicable^1,11.
2. Ask the Planning Commission whether a single-family building permit, building inspection, or certificate of occupancy is required by local ordinance; inside Cadiz, obtain the city building permit and apply for zoning approval^2,3,14.
3. Request the required address for the new structure from Trigg County 911¹⁵.
4. Arrange the septic site evaluation and obtain the septic permit before construction; the local septic minimum is a half-acre^1,5.
5. Apply to the Kentucky Transportation Cabinet for a state-highway driveway, or coordinate an entrance culvert on a county road with the Trigg County Road Department^16,17.
6. Check the flood map before site work because floodplain construction, demolition, or renovation requires a state floodplain permit, and participating local governments also issue local floodplain permits^10,26.
7. Obtain the state plumbing permit and use a Kentucky Certified Water Well Driller if the property needs a private well^9,13.

Start with jurisdiction and title: confirm the Cadiz city boundary, review the recorded plat and deed restrictions, and ask the Planning Commission whether zoning approval or subdivision review affects the project^1,19,27. Rental property inside Cadiz is subject to the city's published privilege-license tax return and fee schedule, but we could not confirm a separate short-term-rental rule²⁸. Then make the purchase contingent on a satisfactory septic site evaluation. Only 23.5% of Trigg County soils are rated “not limited” for a conventional drain field; other sites may need an engineered system, and the local septic lot minimum is a half-acre^1,23.

Check road access and flood exposure before choosing a homesite; state-highway access needs Transportation Cabinet approval, while development in, along, or across a stream needs a Kentucky Division of Water floodplain permit and may also need a local floodplain permit^17,26. Trigg County is 59.3% wooded, while 60.5% of its land has a slope of 15% or less, but parcel-level clearing, drainage, and grade can differ sharply from county averages²³. For budget context, the county's median property-tax bill is about $1,065 per year and its effective property-tax rate is about 0.6%²³.