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You can perform plumbing work in Minnesota if you are:

  • At least 18 years old.

  • Licensed with the Minnesota Department of Labor and Industry (DLI) or registered with DLI as a registered unlicensed plumber, or enrolled in a DLI-registered apprenticeship program.

  • A W-2 employee of a licensed plumbing contractor or registered plumbing employer.

  • Licensed owner or officer of a licensed plumbing contractor or restricted plumbing contractor.

You can perform plumbing work without a license if:

  • You are registered with DLI as a registered unlicensed plumber or enrolled in a registered apprenticeship program.

  • Your work falls under the scope of the work your employer is authorized to perform.

  • Your work is always directly supervised by a licensed journeyworker or master plumber.


Registered unlicensed plumber

  • Apply online or submit the application forms and $14 application fee.

  • You will be assigned a registration number beginning with the letters "PA."

  • Registrations expire June 30 each year.

Registration renewal


Journeyworker plumber exam and license

You must pass an exam to apply for a journeyworker plumber license. To take the journeyworker exam, you must:

  • Complete a registered plumbing apprenticeship program, or

  • Hold a restricted journeyworker plumber license or restricted master plumber license and at least two years of practical plumbing experience gained while holding the restricted plumber license,

  • Provide DLI with evidence of sufficient plumbing work experience as a registered unlicensed plumber; or

  • Have a current plumber’s license from another state where the licensing jurisdiction requires at least four years of practical plumbing experience and an examination to qualify for licensure.

Credit for work experience will be granted if you:

  • Were registered with DLI as a registered unlicensed plumber while working in Minnesota. 

  • Were employed by a company that was licensed by DLI as a plumbing contractor or registered with DLI as a registered plumbing employer.

The exam

If you do not pass the exam you must wait 30 days before reapplying. When you pass the exam you will receive instructions about how to pay for your license.

License renewal

Licenses expire December 31 of odd-numbered years. To renew your license:


Master plumber exam and license

You must pass an exam to apply for a master plumber license. To take the master plumber exam, you must:

  • Be licensed as a journeyworker plumber for at least one year; or

  • Be a currently licensed master plumber from another state where the requirements of the licensing jurisdiction are equivalent to those of Minnesota as determined by DLI; or

  • Be a current Minnesota restricted master plumber with five years of verifiable experience in business as a plumbing contractor in Minnesota.

The exam

If you do not pass the exam you must wait 30 days before reapplying. When you pass the exam you will receive instructions about how to pay for your license.

License renewal

Licenses expire December 31 of even-numbered years. To renew your license:


Where can I find information about contractor licensing requirements?

View contractor plumbing licensing requirements.

Questions?

Contact us at dli.license@state.mn.us or 651-284-5031.