General Regulations, Licensing, and Administrative Provisions
This domain tests how plumbing work is authorized and regulated in Kentucky: who may perform it, when a permit is required, how inspections are sequenced, and what happens when work is done without approval. The Kentucky Plumbing Code is 815 KAR 20:090, which adopts the International Plumbing Code with Kentucky amendments. The Division of Plumbing, within the Department of Housing, Buildings and Construction, administers master and journeyman licensing under KRS Chapter 318. A master plumber may contract for plumbing work and is responsible for permits and supervision; a journeyman installs under a master's authority; an apprentice works under direct supervision. Local jurisdictions may issue permits and inspect, so confirm the authority having jurisdiction before starting.
Core rules
- A permit is required before installing, altering, replacing, or repairing a plumbing system, with limited exceptions for minor repairs defined by the code.
- Permit applications and plans must identify fixtures, pipe sizes, materials, and venting.
- Rough-in and final inspections are separate; concealing work before rough-in inspection is prohibited.
- The permit holder must request inspections, keep approved plans available, and correct violations.
- Plumbing contracting by unlicensed persons is a violation and can expose the property owner and contractor to penalties.
Worked example
A journeyman installs a new 3-inch drain and covers it with concrete before the rough-in inspection. The inspector may require the concrete to be removed to expose the work. Passing a later final inspection does not cure the missed rough-in, because the inspection sequence is a legal requirement, not a scheduling suggestion.
Traps
Do not assume a water heater replacement is automatically permit-exempt; do not let a master plumber rent a license to an unlicensed installer; do not proceed when local amendments differ from the model code.