Kentucky Plumber Side Work: What's Legal and What's Not

The Side Work Question Every Kentucky Plumber Asks

You hold a journeyman license. A neighbor asks you to repipe their bathroom on the weekend for cash. It seems harmless — you have the skills, the tools, and the time. But in Kentucky, this work is illegal, and the penalties are steep enough to end your career.

The core issue is not skill. It is legal authority. Kentucky draws hard lines between who can perform plumbing work, who can contract for it, and who can pull the permits that make it legal.

Why Journeymen Cannot Do Side Work

Under KRS Chapter 318, a journeyman plumber is authorized to perform plumbing work only under the general supervision of a licensed master plumber. That means working for a master's business, on jobs where the master has pulled the permit and takes legal responsibility.

A journeyman cannot:

• Pull plumbing permits (only master plumbers and homeowners working on their own primary residence can)
• Contract directly with the public
• Advertise plumbing services independently
• Perform compensated plumbing work outside a master plumber's employment

Weekend side jobs, even for family and friends, fall outside these boundaries when performed for compensation without a permit. The work is unauthorized regardless of how well you execute it.

What About Master Plumbers?

A master plumber has broader authority — but side work still requires proper structure. To legally perform plumbing work for compensation outside your primary employer, you need:

• Your own registered business entity (LLC, sole proprietorship, etc.)
• A Letter of Representation filed with the DHBC linking your master license to that business
• Active general liability insurance of at least $250,000
• A valid plumbing permit pulled through the state Division of Plumbing for each job

A master plumber who moonlights without these elements is performing unauthorized work, just like an unlicensed journeyman. The permit is what makes the work legal — not the license alone.

The $1,000 Per Day Penalty

Performing plumbing work for compensation without a valid credential — or without a valid permit — is a violation of KRS Chapter 318. The state can impose civil penalties of up to $1,000 per day of violation, plus administrative actions including stop-work orders and license suspension.

These penalties apply to unlicensed individuals performing plumbing work for hire and to licensed practitioners who perform compensated work outside the required master-supervision, permit, or insurance structure.

The Division of Plumbing enforces these violations through its state inspectors, who are present on job sites across Kentucky. A complaint from a neighbor, a competing contractor, or even the homeowner themselves can trigger an investigation.

The Homeowner Exception

Kentucky allows homeowners to perform plumbing work on their own primary personal residence without a plumbing license. They still need to pull a state plumbing permit and pass inspections — but they are exempt from the licensing requirement itself.

This exception does not extend to rental properties, investment properties, or work performed on someone else's home.

The Legal Path Forward

If you are a journeyman who wants to do independent work, the path is clear: upgrade to a master plumber license, register a business, get insured, and pull your own permits. If you are a master who wants to take on side projects, set up the proper business structure first.

The Kentucky Plumber License Guide walks through the exact steps to move from employee to independent contractor legally — including the business registration, insurance, and Letter of Representation filings.

See more Kentucky guides →