Plumbing Contractor License in Idaho: Requirements, Qualifier, Bond and Exams

Yes — statewide.

Idaho licenses plumbers through the Idaho Plumbing Board, administered by DOPL, in three classifications of competency: plumbing contractor, journeyman plumber and apprentice, plus specialty classes.

The plumbing contractor certificate is the one a contracting business runs on; the journeyman and apprentice certificates belong to the individuals who do the work.

Individual plumber licensing in Idaho — how a hire moves from registered apprentice to journeyman plumber — is its own topic.

The Idaho Plumbing Board, administered by DOPL, issues certificates of competency.

Within the contractor classification, our research shows one plumbing contractor certificate; the sources we read do not describe a class split by job value or project size.

Specialty classes exist alongside the three main classifications, and a specialty contractor certificate applicant must hold the relevant specialty journeyman certificate.

To check a certificate, DOPL runs its eDOPL online services under the Search for a License label.

The work itself follows the Idaho State Plumbing Code, published by IAPMO and linked from DOPL's Plumbing Board page; we could not confirm the adopted edition from the board's page, so check the current edition with DOPL.

Idaho ties the certificate to a qualified individual.

The contractor applicant must already hold a journeyman plumber certificate, pass the board-designated contractor exam and post the $2,000 compliance bond.

The journeyman certificate behind that takes a passing board exam plus either 8,000 hours as an apprentice making plumbing installations and 576 hours of board-approved instruction, or 16,000 hours of plumbing experience.

Two crew rules sit under that apprenticeship: apprentices must register with DOPL and may do plumbing work only under a journeyman's supervision.

The statute also keeps a journeyman close to the work: a contractor who personally does plumbing must be qualified as a journeyman plumber, or have a qualified journeyman on all work.

And one holder, one representation — a contractor certificate holder may represent only one person or entity at a time.

The plumbing contractor applicant must successfully pass an examination designated by the Board, and the journeyman certificate beneath it carries its own board exam.

Our research did not confirm the vendor for the Plumbing Board's contractor exam.

DOPL's HVAC program page says Idaho HVAC (and contractor) exams are delivered by PSI, and that the Contractors' Business and Law Reference Manual may be brought into the exam in a binder, with pre-highlighting allowed but no writing during the exam.

Whether the same arrangement applies to the plumbing contractor exam is not established in our research, so confirm the vendor and the materials policy with DOPL before you book study time.

The bond is on the record: the contractor applicant must provide a compliance bond in the amount of $2,000 for the certificate period.

What our research did not find is an insurance minimum — the Idaho plumbing statute and rules we read state no liability-insurance figure for the plumbing contractor certificate, so ask DOPL what it requires before you bid.

HVACHires' separate guide to contractor license bonds and insurance explains how these instruments work in general.

Certificates of competency are issued for 3 years and expire three years from the date of issue.

A contractor renewal requires proof of the board's continuing education, but the CE hours per cycle were not found in the Idaho plumbing rules (IDAPA 24.39.20) as we read them — ask DOPL for the current figure.

The $2,000 compliance bond is provided for the certificate period.

Application and renewal fee amounts for the contractor certificate were not established in our research; DOPL's plumbing program pages and its eDOPL portal are the place to confirm them.

We did not find a reciprocity provision for plumbing certificates in the Idaho statute, rules and DOPL pages we read.

We cannot tell you whether Idaho accepts another state's journeyman certificate toward the contractor certificate, waives the board exam for out-of-state holders, or credits out-of-state experience toward the 8,000-hour or 16,000-hour minimums.

Treat Idaho's requirements as applying to you in full until DOPL says otherwise, and ask the board before you staff a job around an agreement you have not verified.

The rule on record is explicit about notice, not about deadlines.

A plumbing contractor certificate holder may represent only one person or entity, and if that representation changes or ends for any reason, the holder must immediately notify DOPL in writing.

What our research does not establish is a replacement window — the Idaho rules we read state no deadline for substituting a new qualifier, so confirm with DOPL what the board expects in the gap.

Two things shape your options.

You cannot double up: one certificate holder represents one business at a time, so another shop's qualifier cannot also carry your license.

And growing a replacement from inside your crew is a long road: the journeyman certificate first — 8,000 apprentice hours plus 576 instruction hours, or 16,000 hours of experience, plus the board exam — then the contractor exam and the $2,000 bond.