Idaho Plumbing Contractor License

Contractor vs. Journeyman: What's Actually Different

This distinction trips up a lot of Idaho plumbers because the titles sound like they describe skill level. They don't — they describe scope of authority.

A Journeyman Plumber can perform independent, code-compliant plumbing installations. They can work without direct supervision, and they're qualified to supervise apprentices. What they can't do: pull permits, bid on projects, hire employees, or offer plumbing services directly to the public.

A Plumbing Contractor can do all of that. The contractor credential is the only license that authorizes a plumber to operate a business, pull state or local permits, and assume liability for the work of supervised apprentices and journeymen. Idaho doesn't issue a separate "master plumber" license — the contractor credential is the functional equivalent and the highest tier in the state.

In practical terms: if you want to work for someone else, a journeyman license is sufficient. If you want to run your own operation, you need the contractor upgrade.

Requirements for the Contractor License

The contractor license sits on top of an active journeyman credential. You can't skip the journeyman tier. Here's what you need:

Experience: An active Idaho journeyman plumber license with a minimum of 30 months (2.5 years) of post-licensure experience. The clock starts when DOPL issues your journeyman license, not when you passed the exam.

Application: Submit a Plumbing Contractor Application to DOPL with a $22.50 non-refundable fee. DOPL reviews your experience documentation before approving you to sit for the contractor exam.

Contractor exam: Schedule and pass the contractor exam through PSI Services. This is a separate exam from the journeyman test — it runs 4 hours and focuses on business operations, contractor regulations, project management, and state law rather than technical plumbing code. You'll need DOPL's Contractors' Business and Law Reference Manual printed and placed in a three-ring binder as your open-book reference. The exam fee is $75 per attempt, and the passing score is 70%.

Bonding: A $2,000 surety compliance bond, purchased through an authorized commercial surety provider. The bond must include the correct legal entity name and be notarized.

Insurance: General liability insurance with a minimum $300,000 per occurrence. While $300,000 meets the state minimum, most general contractors and commercial developers won't let you on-site with less than $1,000,000 per occurrence and $2,000,000 aggregate.

Licensing fee: $147 for the initial three-year license.

The Qualifying Plumber Requirement

When a business entity — an LLC, corporation, or partnership — applies for a contractor registration, it must designate a "qualifying plumber." This is an individual who holds an active Idaho journeyman license and whose credentials authorize the business to operate.

For sole proprietors, you serve as your own qualifying plumber. For larger entities, the qualifying plumber must be an officer, owner, or full-time employee of the business.

If the qualifying plumber leaves the company or lets their license lapse, the business's contractor registration becomes invalid until a replacement is designated.

What Happens If You Skip the Contractor License

Operating a plumbing business without a valid contractor registration carries real consequences: stop-work orders, civil penalties, and loss of permitting privileges with local building departments. Pulling permits under someone else's contractor license when you're actually running your own operation is a separate violation.

The enforcement mechanism is straightforward — anyone can look up your contractor status through DOPL's public search portal, and building inspectors routinely verify permit-puller credentials.

Cost Breakdown

The total outlay for upgrading from journeyman to contractor:

The bond premium depends on your credit and the surety provider. The insurance cost varies dramatically based on whether you carry the state minimum ($300,000) or the commercially realistic ($1,000,000/$2,000,000) limits.

For a complete walkthrough of the contractor upgrade process — including the bond and insurance requirements, the exam scheduling logistics, and a decision tree for choosing a business structure — the Idaho Plumber License Guide covers every step.

See more Idaho guides →