Idaho Plumber License Requirements (2026)

The Idaho State Plumbing Board, within the Division of Occupational and Professional Licenses (DOPL), regulates state plumbing licenses. Idaho’s main individual path is apprentice registration to Journeyman Plumber; a Plumbing Contractor certificate is required to offer plumbing-contracting services to the public. The state plumbing license is distinct from Idaho’s general contractor registration, from which licensed plumbers are exempt when they stay within their licensed scope.

Regulatory Body

Under Idaho Code Title 54, Chapter 26; Idaho Plumbing Board rules, Idaho Division of Occupational and Professional Licenses — Idaho State Plumbing Board (Idaho Plumbing Board) is the body that issues this license and enforces compliance with it. Issues plumbing apprentice, journeyman, specialty, and contractor credentials; administers plumbing permits, inspections, and licensing.

Official portal: https://dopl.idaho.gov/plb/
Address: 11341 W. Chinden Blvd., Boise, ID 83714
Phone: (208) 334-3233

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 an Idaho-residency requirement.

Good moral character

The current Board materials reviewed focus on the applicable experience, examination, application, and contractor-bond requirements.

Background investigation

The current Board materials reviewed do not prescribe a separate criminal-background-check requirement.

Experience and Education

Eligibility requires 4 years of For a Journeyman license, the Idaho apprenticeship route requires 8,000 hours of work experience and four years of approved schooling. An alternative route requires 16,000 hours of plumbing work experience. In-state experience must be completed while the applicant holds active Idaho apprentice registration. The Plumbing Contractor application requires an active Idaho Journeyman credential; confirm any additional experience route with DOPL before applying., documented and independently verifiable. Payroll, tax, project, and supervisor records are the usual proof the board will accept.

Accepted proof of experience or eligibility

Active Idaho apprentice-registration history for in-state hours
Board-approved apprenticeship-school completion documentation, where using that route
Employer or other experience verification required by the Journeyman application
Current Idaho Journeyman credential for a Plumbing Contractor application

Education substitution

Four years of approved schooling is part of the 8,000-hour apprenticeship route. The alternative published route is 16,000 hours of work experience; do not assume other education substitutions.

Exam Requirements

Testing provider or authority: IAPMO examination through PSI, followed by application to Idaho DOPL. 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:

Idaho Journeyman Plumber examination — question count: confirm with the authority, timing: confirm with the authority, passing score 75%
Idaho Plumbing Contractor examination — question count: confirm with the authority, timing: confirm with the authority, passing score 75%

Examination fee: Verify the current PSI/IAPMO examination fee when scheduling; DOPL separately lists a $22.50 application fee.

Retake policy: A failing applicant may apply to retake after paying the applicable examination fee. Confirm the current candidate bulletin and DOPL application instructions before scheduling.

Insurance and Bonds

A contractor license surety bond of $2,000, on the Idaho Plumbing Board's prescribed form, is a precondition to issuance.

General liability

A $2,000 surety/compliance bond is required before DOPL issues the Plumbing Contractor certificate. The plumbing licensing materials reviewed do not state a separate statewide general-liability minimum for the trade certificate.

Workers' compensation

A licensed plumber is exempt from Idaho contractor registration when contracting only within the licensed plumbing scope. If contractor registration is required for other work, its separate workers’ compensation and liability requirements apply.

Additional financial requirements

No state financial-statement requirement was identified for the Journeyman or Plumbing Contractor certificate.

Fee Schedule

Fee	Amount
Application	$22.50
Initial license	$147
Renewal (every 3 years)	$108

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 Idaho plumber.

Renewal and Continuing Education

Renewal of the Idaho Journeyman Plumber and Plumbing Contractor comes due every 3 years. As cited, the renewal fee stands at $108. Current DOPL fee table: Journeyman renewal $21.60; Plumbing Contractor renewal $108. Verify the license’s own expiration date and renewal notice.

Continuing education: No plumbing CE is required according to DOPL’s current Plumbing FAQ.

Downloadable Asset

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

Download the PDF roadmap →

Reciprocity

The NASCLA Accredited Examination is not accepted by Idaho for this classification.

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

DOPL confirms that Idaho has reciprocal licensing agreements and directs applicants to its current Reciprocal Information document. Do not rely on older lists of named states; verify the license type and current agreement with DOPL.

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 Idaho's requirements against the bordering jurisdictions before committing to an application:

Montana Plumber License Requirements — Montana Journeyman and Master Plumber
Nevada Plumber License Requirements — Nevada C-1 Plumbing and Heating Contractor
Oregon Plumber License Requirements — Oregon Journeyman Plumber and Plumbing Business (PB) License
Utah Plumber License Requirements — Utah Master Plumber License and P200 Contractor License
Washington Plumber License Requirements — Washington Journey Level Plumber (PL01)
Wyoming Plumber License Requirements — Wyoming Plumbing Requirements (Local Credentials and Permits)

Step-by-Step Application Roadmap

Hold active Idaho apprentice registration. For in-state on-the-job experience to count, maintain an active Idaho Plumbing Apprentice registration.
Complete a published Journeyman route. Complete 8,000 work hours plus four years of approved schooling, or document 16,000 hours of plumbing experience.
Pass the IAPMO examination. Register with PSI, pass the Journeyman examination, then apply to DOPL for licensure.
Apply to DOPL for Journeyman licensure. Submit the required experience and examination documentation with the DOPL application.
Apply for the Plumbing Contractor certificate when offering services to the public. Hold the required active Idaho Journeyman credential, pass the contractor examination, and provide the $2,000 bond before issuance.
Use the correct contractor-registration scope. Idaho’s general contractor registration may be required for work outside the plumbing licensed scope; licensed plumbers are exempt while within it.
Renew on the Board’s three-year cycle. Check the DOPL portal and Board fee table for the expiration date and current renewal procedure.

Application Checklist

The items below are the ones worth confirming before the application is filed with Idaho Plumbing Board:

Maintain active Idaho apprentice registration for in-state experience
Complete the 8,000-hour/four-year-schooling route or document the 16,000-hour route
Pass the current IAPMO Journeyman examination through PSI
Apply to DOPL with the $22.50 application fee and the applicable initial license fee
For a Plumbing Contractor certificate, maintain the required active Idaho Journeyman credential, pass the contractor examination, and file a $2,000 bond
Check DOPL’s current reciprocity document rather than relying on an old state list

Common Filing Mistakes

Working from the cited board instructions, here are the snags most likely to trip up a Idaho Plumber filing.

Earning Idaho hours while unregistered

DOPL states that hours worked without the required state-issued license/registration do not count toward required on-the-job training.

Confusing contractor registration with the plumbing contractor certificate

A Plumbing Contractor certificate regulates plumbing contracting; the separate general contractor registration is exempt for licensed plumbers working within their trade scope.

Using an old named-reciprocity list

DOPL directs applicants to a current reciprocity document. Confirm the exact credential and agreement before scheduling or filing.

Forgetting the contractor bond

The Plumbing Contractor certificate cannot issue until the $2,000 surety bond is submitted after the contractor examination.

Study and Reference Materials

The references below are either cited by the board, used during the application, or standard preparation for the trade. They are listed purely for convenience — CLR earns no commission on any of them.

Idaho State Plumbing Code — Idaho DOPL. Use the current code adopted by the Idaho Plumbing Board.
DOPL Plumbing examination bulletin — Idaho DOPL. Use the current bulletin for approved references, scheduling, and examination rules.
Idaho Plumbing Board application instructions — Idaho DOPL. Primary source for the published experience paths and application documents.

Other Idaho Trade Licenses

Should the Plumber path not apply, these other Idaho trade guides from CLR may help:

Frequently Asked Questions

Does Idaho license plumbers statewide?

Yes. DOPL’s Idaho State Plumbing Board administers apprentice, journeyman, specialty, and contractor plumbing credentials statewide.

How do I qualify for Idaho Journeyman Plumber licensure?

The published paths are 8,000 work hours plus four years of approved schooling, or 16,000 work hours. In-state hours must be earned while the Idaho apprentice registration is active.

Is continuing education required for Idaho plumbing licenses?

No. DOPL’s current Plumbing FAQ states that Idaho has no plumbing continuing-education requirement.

What bond does an Idaho Plumbing Contractor need?

DOPL’s current contractor application requires a $2,000 surety bond after the contractor examination is passed and before the certificate is issued.

Does a licensed Idaho plumber also need contractor registration?

Not for contracting within the plumbing licensed scope. DOPL says licensed plumbers need general contractor registration only when contracting beyond that scope.

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.