Montana Plumber License Requirements (2026)

The Montana Board of Plumbers licenses Journeyman and Master Plumbers statewide. A Journeyman license does not authorize a person to obtain plumbing permits, advertise as a plumbing business, or operate a plumbing business; a Master Plumber is required to obtain plumbing permits. The Board’s current materials govern application and renewal, while the state building code program administers plumbing permits and inspections.

Regulatory Body

Authority over this credential rests with Montana Department of Labor & Industry — Board of Plumbers (Montana Board of Plumbers), which issues and polices it under Montana Code Annotated Title 37, Chapter 69; ARM Title 24, chapter 180. Licenses Journeyman and Master Plumbers, administers Board examinations and continuing education, and coordinates with state plumbing-permit requirements.

Official portal: https://boards.bsd.dli.mt.gov/plumbers/
Address: 301 S. Park Avenue, 4th Floor, Helena, MT 59620
Phone: (406) 444-6880

Eligibility Requirements

This guide does not establish a minimum applicant age; confirm any age requirement with the issuing authority. Check the current application for identification and tax-number requirements. The current Board materials reviewed do not impose a Montana-residency requirement.

Good moral character

The Board application requires professional-license verification and other supporting records. Consult the current checklist for any discipline-related disclosures.

Background investigation

The Board materials reviewed do not identify a separate fingerprint-based background check for these licenses.

Experience and Education

The experience bar is 5 years of For Journeyman, submit verification of five years of legally obtained plumbing experience; the Board also lists completion of a registered apprenticeship program. For Master by examination, the current checklist requires four years (at least 6,000 hours) of legally obtained plumbing experience at Journeyman level or higher, including three years working with a licensed Master Plumber or in a supervisory capacity. A distinct out-of-state route requires nine years of legally obtained plumbing experience., and it must be backed by verifiable records — typically payroll, tax, project, or supervisor documentation covering the claimed period.

Accepted proof of experience or eligibility

Journeyman or Master application and current Board checklist
Experience-verification affidavit/voucher completed by an active Montana Master Plumber or Plumbing Contractor, as applicable
Registered-apprenticeship completion certificate, when using that route
Official verification of licenses held in other jurisdictions

Education substitution

A registered apprenticeship completion certificate is listed in the Journeyman requirements. The Board’s current application materials control which records demonstrate an individual route.

Exam Requirements

Testing provider or authority: Montana Board of Plumbers examination vendor or Board-administered examination, as directed after application approval. The following examination requirements cover the pathways described in this guide; follow each part's classification, waiver, and local-scope conditions. Unpublished format details do not remove an examination requirement:

Journeyman Plumber written and practical examination — question count: confirm with the authority, timing: confirm with the authority, passing score 70%
Master Plumber examination — question count: confirm with the authority, timing: confirm with the authority, passing score: confirm in the current candidate bulletin

Examination fee: Vendor examination fees vary by examination; confirm the current amount with the Board after application approval.

Retake policy: Follow the current Board application and examination instructions. Do not rely on older PSI-specific retake or timing claims.

Insurance and Bonds

There is no statewide surety bond tied to this credential in the cited record. Bonding can still surface at the project level — permit, license, or public-works bonds — so check before you bid.

General liability

The Board materials reviewed do not state a statewide general-liability minimum for a Journeyman or Master plumbing license.

Workers' compensation

A Montana-licensed plumber operating within the scope of the plumbing license is expressly exempt from the separate Construction Contractor License requirement. Workers’ compensation obligations remain governed by Montana law and the business’s employment arrangement.

Additional financial requirements

No financial-statement requirement was identified for the individual Journeyman or Master plumbing license.

Fee Schedule

Fee	Amount
Application	$380
Initial license	No separate amount recorded; confirm in the fee guidance
Renewal (every year)	No separate amount recorded; confirm in the fee guidance

To turn these board fees into a realistic year-one budget — bond premium, liability insurance, and exam prep included — open the cost calculator preloaded for Montana plumber.

Renewal and Continuing Education

The Montana Journeyman and Master Plumber must be renewed every year. A standalone statewide renewal fee is not published in the cited record. Renewal deadline is September 1. DLI states that FY 2026 timely license renewal fees are 100% abated, but late fees apply; confirm the next renewal fee with the Board.

Continuing education: Four hours of Board-approved continuing education each license year for active licensees; new licensees are exempt for their first renewal.

Downloadable Asset

2026 Montana Plumber License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity

Montana grants no NASCLA reciprocity for this classification.

Reciprocal State	Accepted Exam	Conditions
No formal bilateral reciprocity agreements identified.

The Board’s FAQ makes clear that an out-of-state license does not itself authorize plumbing work in Montana: an applicant must apply for Montana licensure by reciprocity. Confirm the current reciprocal jurisdiction and license type with the Board before applying.

Weighing more than one jurisdiction? The national hub compares published Plumber license requirements by state — exam, bond, fee, and experience thresholds side by side.

Plumber Licensing in Neighboring States

Contractors working near a state line, or weighing where to qualify first, should compare Montana's requirements against the bordering jurisdictions before committing to an application:

Idaho Plumber License Requirements — Idaho Journeyman Plumber and Plumbing Contractor
North Dakota Plumber License Requirements — North Dakota Master and Journeyman Plumber
South Dakota Plumber License Requirements — South Dakota Plumber and Plumbing Contractor
Wyoming Plumber License Requirements — Wyoming Plumbing Requirements (Local Credentials and Permits)

Step-by-Step Application Roadmap

Document the applicable Journeyman route. Collect five years of legally obtained plumbing experience and the required verifier voucher, along with apprenticeship documentation where applicable.
Apply for Journeyman examination/licensure. Use the current Board checklist and provide the required licensing and experience records.
Pass the Journeyman examinations. The Board lists a 70% or higher score on the written and practical examination.
Build the Master-qualifying experience. For the standard Master route, document four years/6,000 hours at Journeyman level or higher, including three years with a licensed Master or in supervisory capacity.
Apply for Master licensure. Use the current Master checklist and furnish the required experience verification and official license verifications.
Use the Master credential for business and permits. Only a Master Plumber may obtain plumbing permits and engage/advertise as a plumbing business under the Board’s FAQ.
Complete annual renewal and CE. Renew by September 1 and complete the required Board-approved CE unless an exception applies.

Application Checklist

Have each of the following squared away before the packet goes to Montana Board of Plumbers:

Document the applicable Journeyman or Master experience route
Obtain the active Master Plumber or Plumbing Contractor voucher required for the Journeyman route
Submit the current Board application and official out-of-state license verifications, where applicable
Pass the Journeyman written and practical examinations at 70% or better
For Master, document the current 6,000-hour/three-year Master-or-supervisory component or qualifying out-of-state route
Complete four hours of approved CE before annual renewal

Common Filing Mistakes

The following pitfalls summarize the issues most likely to delay, return, or derail a Montana Plumber application based on the published board instructions and source materials cited on this page.

Treating a Journeyman license as a business/permit credential

The Board expressly says a Journeyman may not obtain permits or engage in or advertise as a plumbing business.

Using an out-of-state license without Montana approval

Out-of-state plumbers must apply for Montana licensure by reciprocity before working as licensed plumbers in Montana.

Using the 2026 fee abatement as a permanent renewal price

The Board’s FY 2026 timely-renewal abatement is specific to that renewal cycle; late fees apply and future fees should be checked before renewal.

Adding a construction-contractor license unnecessarily

The 2026 construction-contractor law exempts a Montana-licensed plumber acting within the scope of the plumbing license.

Study and Reference Materials

These materials are drawn from the regulator's own citations and the references applicants commonly use to prepare. CLR receives no compensation for listing them.

Montana Board of Plumbers current application checklists — Montana DLI. Primary source for qualification and supporting-document requirements.
Montana State Plumbing Code and current adopted UPC materials — Montana Building Codes Program. Use the current adopted code, rather than an older codebook, for technical preparation.
ARM 24.180.2102 CE requirements — Montana Administrative Rules. Source for the annual four-hour CE requirement and qualifying course topics.

Other Montana Trade Licenses

Looking at a different trade? CLR also publishes these Montana licensing guides:

Frequently Asked Questions

Who licenses plumbers in Montana?

The Montana Board of Plumbers, within the Department of Labor & Industry, licenses Journeyman and Master Plumbers statewide.

How much experience is required for a Montana Journeyman Plumber?

The Board lists five years of legally obtained plumbing experience, verified by the required form, and also identifies registered-apprenticeship completion documentation.

Can a Montana Journeyman Plumber obtain plumbing permits?

No. The Board states that only a Master Plumber may apply for and obtain plumbing permits; a Journeyman may not advertise as or engage in a plumbing business.

Does Montana accept an out-of-state plumbing license automatically?

No. The Board says you must apply for Montana licensure by reciprocity. Confirm the current agreement and credential with the Board.

How much CE is required for Montana plumbers?

Each active licensee must complete four hours of Board-approved CE each license year. New licensees are exempt for the first renewal.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-09-04 · Next scheduled review 2026-12-03

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Corrections and presentation updates

2026-09-30: Corrected examination detection when format details are unpublished and updated the summary layout and requirements score. Source-check dates are unchanged.
2026-09-08: Shared template updated to distinguish unspecified eligibility requirements, retain cost qualifications, and use consistent headings. Source-check dates are unchanged by presentation updates.
2026-09-21: Local-only guides now use a compliance-focused structure and terminology instead of implying a statewide license application. Source-check dates are unchanged by this presentation update.