Plumbing work in Minnesota is heavily regulated under Minnesota Statutes Chapter 326B. Every plumber — and the company they work for — must hold a current license issued by the Department of Labor and Industry. This isn't optional: unlicensed plumbing work is a misdemeanor, and improperly installed plumbing creates health hazards that affect entire communities through the water supply.
This guide explains Minnesota plumbing license types, what each allows the holder to do, and how to perform an MN plumbing license lookup before your next project.
Minnesota Plumbing License Types
Journeyman Plumber
A Journeyman Plumber has completed an apprenticeship (typically 4–5 years) and passed the journeyman exam. They can:
- Install, repair, and maintain plumbing systems
- Work on new construction and remodels
- Work independently on residential projects in some jurisdictions
A Journeyman Plumber cannot pull plumbing permits in most situations — that typically requires a Master Plumber or licensed plumbing contractor.
Master Plumber
A Master Plumber has additional years of experience beyond journeyman status and has passed the master plumber exam. They can:
- Pull plumbing permits
- Supervise apprentices and journeymen
- Own and operate a licensed plumbing contracting business
- Sign off on plumbing installations for inspections
If you're hiring a plumbing company for significant work — new construction, full bathroom remodel, main line replacement — you want a Master Plumber on the job.
Plumbing Contractor
This is the business license required for any company offering plumbing services. A Plumbing Contractor license is held by the business entity itself, separate from the individual plumber licenses. The company must have at least one licensed Master Plumber on staff.
Apprentice Plumber
Registered apprentices can perform plumbing work under the direct supervision of a journeyman or master. They hold a license showing their apprentice status — they cannot work independently.
How to Perform a Minnesota Plumbing License Lookup
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Our MN license search covers all DLI plumbing license types. Search by company name, plumber name, or license number to instantly verify current status, expiration date, and license type.
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What to Check on a Plumbing License
When you run a Minnesota plumbing license lookup, verify these fields:
| Field | What You Need | Why It Matters |
|---|---|---|
| Status | Active | Any other status = not legally allowed to work |
| License Type | Matches the work scope | A journeyman can't pull permits; an apprentice can't work alone |
| Expiration Date | Not imminent | Licenses expire — especially after CE deadline periods |
| License Number | Matches contractor's paperwork | Anyone can claim a license number they don't hold |
Why Plumbing Permits Matter More Than You Think
Minnesota plumbing permits exist for good reason. Improperly installed plumbing can:
- Cause sewage backflow into drinking water lines (a serious public health hazard)
- Result in hidden leaks that cause structural damage before detection
- Fail inspection — requiring tear-out and reinstallation at your expense
- Void insurance claims related to water damage
Licensed plumbers know the code. They pull permits so their work gets inspected. If a plumber offers to skip the permit to "save you money," that's a warning sign.
Common Questions About MN Plumber Licenses
Can a handyman do plumbing work in Minnesota?
Only minor repairs that don't require permits — like replacing a faucet, fixing a running toilet, or unclogging a drain — can be done without a plumbing license. Any work that involves opening walls, connecting to the main supply line, or extending drain/waste/vent systems requires a licensed plumber.
Can a homeowner do their own plumbing?
Yes. Minnesota law allows homeowners to do plumbing work on their own primary residence without a license, but permits are still required for significant work, and the work must pass inspection. Homeowners cannot do plumbing work on rental property they own.
How often do plumbing licenses expire?
Minnesota plumbing licenses typically expire on a 2-year renewal cycle. Continuing education requirements vary by license type. Always verify expiration date when checking a license — even licenses that were valid last year may have lapsed.
Red Flags When Hiring a Plumber
- Can't provide a license number on request
- Offers to skip the permit "to keep costs down"
- License lookup shows expired or revoked status
- Sends an apprentice to do permitted work unsupervised
- No business license (Plumbing Contractor license) — just an individual's journeyman license
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