Who needs a Minnesota plumbing license?
Minnesota requires plumbing workers to be either licensed, registered as an unlicensed plumber, or enrolled in a DLI-registered apprenticeship. A registered unlicensed plumber may work only under direct supervision of a licensed journeyworker or master plumber. DLI also requires the worker to be a W-2 employee of a licensed plumbing contractor, restricted plumbing contractor, or registered plumbing employer. The Minnesota Department of Labor and Industry licensing basics explain the worker rules and application path.
The short answer is that the individual credential and the business credential do different jobs. Journeyworker and master licenses establish who may perform or supervise plumbing. A separate contractor license authorizes the business to offer and perform plumbing work. If you are still comparing trade paths, start with our broader guide to how to get a plumbing license.
The Minnesota plumbing credential ladder
Minnesota separates individual credentials from the contractor license held by the business. The statutory definitions describe a journeyworker as an employee working under a master plumber and a master as the person skilled in planning, superintending, and installing plumbing.
| Credential | What it allows | Key limit |
|---|---|---|
| Registered unlicensed plumber | Hands-on plumbing while building qualifying experience | Direct, in-person supervision is required |
| Journeyworker plumber | Practical installation as an employee or under a master plumber | Does not by itself license a contracting business |
| Master plumber | Planning, supervision, installation, and qualification as a business responsible individual | The individual license and contractor license remain separate |
| Plumbing contractor | The business may offer and perform plumbing statewide through licensed and registered workers | Must designate a master plumber as responsible individual |
| Restricted license or contractor | Work in qualifying smaller communities | Not valid in cities or towns over the population threshold |
For comparison, Minnesota uses a separate ladder for electrical work; see the Minnesota electrician license tiers.
Regular vs. restricted licenses
A restricted master plumber and restricted journeyworker plumber may work throughout Minnesota except in cities and towns with more than 5,000 residents according to the last federal census. The regular license is the practical choice if you want access to larger cities or expect your service area to grow.
The restricted path is now a legacy credential, not a normal entry route. Minnesota law set a narrow 2009 application window, and a restricted license is permanently forfeited if it is not renewed within 12 months after expiration. The current limits are stated in Minnesota Statutes section 326B.475. Do not treat restricted as an easier license you can newly choose today.
How to reach journeyworker and master
For the experience route, a registered unlicensed plumber becomes eligible for the journeyworker exam after four years and 7,000 hours of practical work. Those hours must include at least 2,000 in water-distribution installation, 2,000 in drain-waste-vent installation, and 1,000 in fixture installation. The dedicated registered unlicensed plumber page gives the current category breakdown.
A completed registered plumbing apprenticeship is another route to the journeyworker exam. DLI may also accept an active out-of-state license from a jurisdiction that required at least four years of practical experience and an exam. To qualify for the Minnesota master exam through the ordinary in-state route, you must have held a journeyworker plumber license for at least one year.
Both license levels require a written exam before application. The exam application fee is $50, and an unsuccessful candidate must wait 30 days before reapplying. DLI issues scheduling instructions only after approving the application, so do not reserve travel around an assumed test date. See the DLI plumbing license basics for the current exam and master-eligibility rules.
Business license, bond, insurance, and renewal
A plumbing contractor must designate a master plumber as its responsible licensed individual. The contractor license then authorizes the company to offer and perform plumbing work statewide through properly licensed or registered workers. Under Minnesota Statutes section 326B.46, the contractor must maintain a bond of at least $25,000. The same statute sets minimum liability limits of $50,000 per person and $100,000 per occurrence, plus at least $10,000 in property-damage coverage.
The personal-license renewal cycle is separate. Journeyworker and master licenses expire on December 31 of odd-numbered years. Renewal requires 16 hours of DLI-approved continuing education, including at least eight hours related to the State Plumbing Code. DLI currently lists a $53 journeyworker renewal fee and a $93 master renewal fee; late fees are $20 and $40 respectively on the plumbing license basics page.
There is one current agency-page conflict worth flagging. DLI’s licensing-basics page lists a $19 registered-unlicensed renewal fee, while its dedicated registration page lists $14. Both pages say the registration expires June 30 and requires two hours of continuing education. Use the amount shown in the iMS renewal checkout, and ask DLI to resolve the discrepancy before sending a paper payment. See the dedicated registered-unlicensed plumber page for its posted amount.
Which states have plumbing reciprocity with Minnesota?
Minnesota currently offers exam-free reciprocity only to qualifying journeyworker and master plumbers licensed by examination in North Dakota or South Dakota. Wisconsin is not on DLI’s current list. The applicant must hold the same or a higher license class, have held it for at least one year, and keep it current and in good standing. The application and examination fee is $50.
DLI also says that a Minnesota plumber who lets a license remain unrenewed for more than two years cannot regain that class through reciprocity and must retake the exam. Read the current conditions on the DLI plumbing reciprocity page before relying on an out-of-state credential.
Minnesota plumbing license FAQ
Can an unlicensed plumber work alone in Minnesota?
No. A registered unlicensed plumber must be directly supervised by a licensed master, restricted master, journeyworker, or restricted journeyworker plumber who works for the same employer. Electronic supervision does not satisfy the statutory definition of direct supervision. See Minnesota Statutes section 326B.42.
How many hours are needed for the journeyworker exam?
The experience route requires four years and 7,000 hours, including the specified minimums for water distribution, drain-waste-vent, and fixture installation.
Does Minnesota reciprocate with Wisconsin for plumbers?
No. DLI’s current reciprocity page lists North Dakota and South Dakota only.
What does a Minnesota plumbing business need?
A contractor license and a master plumber designated as the responsible individual are required. The business also needs a bond of at least $25,000. See Minnesota Statutes section 326B.46 for the contractor requirements.