An MN plumbing license lookup is the single most important step before hiring any plumber in Minnesota. Unlicensed plumbing work violates Minnesota law, voids insurance claims, and creates health hazards that affect your entire household through the water supply. The good news: verifying a plumber's license takes less than 60 seconds.
This guide shows you exactly how to perform an MN plumbing license lookup, what the results mean, and what to do if something doesn't check out.
How to Do an MN Plumbing License Lookup (3 Steps)
Step 1: Get the Plumber's Name or License Number
Ask any plumber you're considering hiring for their license number. A legitimate licensed plumber will provide this without hesitation — it's public information. If they're evasive about their license number, that's your first red flag.
You can also search by company name or the plumber's full name if you don't have the license number.
Step 2: Search Our Free MN License Database
Enter the name or license number into our free search tool. We aggregate all Minnesota DLI plumbing license records — Master Plumber, Journeyman Plumber, Plumbing Contractor, and Apprentice — updated daily from official state data.
Search MN plumbing licenses free →
Step 3: Check These Four Fields
| Field | What to Look For | Red Flag |
|---|---|---|
| Status | "Active" | Expired, Inactive, Revoked, or Suspended |
| License Type | Matches the work scope | Apprentice doing unsupervised work; no Contractor license for the company |
| Expiration Date | Well into the future | Expiring within 30 days on a long project |
| License Number | Matches what plumber provided | Number doesn't match or returns no results |
Understanding Minnesota Plumbing License Types
Not all plumbing licenses are equal. Understanding the types helps you know whether the person showing up at your door is actually qualified for your project.
Master Plumber
The highest individual plumbing license in Minnesota. A Master Plumber can pull permits, supervise other plumbers, and own a plumbing contracting business. For major projects — new construction, full remodels, main line work — you want a Master Plumber involved.
Journeyman Plumber
A fully trained plumber who has completed their apprenticeship and passed the journeyman exam. They can perform all plumbing work but typically cannot pull permits independently. A journeyman working for a licensed plumbing contractor is standard for most residential jobs.
Plumbing Contractor
This is the business license. Any company offering plumbing services in Minnesota must hold a Plumbing Contractor license. The company must employ at least one licensed Master Plumber. Always verify both the company's Contractor license and the individual plumber's personal license.
Apprentice Plumber
A registered apprentice learning the trade. Apprentices can perform plumbing work only under direct supervision of a licensed journeyman or master. If an apprentice shows up alone to do your plumbing work, that's illegal.
Why MN Plumbing License Lookup Matters
Plumbing failures are not cosmetic problems. Improperly installed plumbing can:
- Contaminate drinking water — Cross-connections between supply and drain lines create backflow hazards
- Cause hidden water damage — Slow leaks inside walls destroy framing and promote mold
- Void your homeowner's insurance — Insurers routinely deny claims for work done by unlicensed plumbers
- Create code violations on resale — Unpermitted plumbing work surfaces during home inspections
A 60-second MN plumbing license lookup eliminates all of these risks before work begins.
Need to Verify Multiple Plumbing Licenses at Once?
Property managers, general contractors, and commercial building owners often need to verify plumbing licenses for multiple subcontractors. Our batch verification tool handles this — paste a list or upload a CSV and get instant results for every name.
Batch verify plumbing licenses →
Track Plumber License Expirations Automatically
If you work with the same plumbing contractors regularly, set up monitoring to get alerted before their licenses expire. Our system checks DLI records daily and notifies you at 90, 60, and 30 days before expiration — so you never get caught with an expired subcontractor on a job site.
Set up plumber license monitoring →
What to Do If Your Plumber's License Doesn't Check Out
- Ask the plumber directly — Occasionally renewal paperwork is in process. Request written proof.
- Do not let work begin — Working without a valid license is a misdemeanor under Minnesota Statute 326B.
- Report to DLI — If someone is offering plumbing services without a license, file a complaint at dli.mn.gov.
- Find a licensed alternative — Search our database for active licensed plumbers in your area.
Find a licensed MN plumber → | Get a full compliance report →
Get weekly MN license updates — free
We track Minnesota license regulation changes so you don't have to. No spam, just the updates that matter.
No spam. Unsubscribe any time.