Does Wyoming License Plumbing Contractors? What the Business Needs Instead

Locally, as far as our research shows.

We found no state plumbing contractor license in Wyoming — an absence inferred from the state sources we checked rather than stated by one, so confirm with the city where you will work.

The state's trade-licensing agency, the Department of Fire Prevention and Electrical Safety (the State Fire Marshal), licenses electricians and runs no plumbing or HVAC license program; its site offers electrical licensing and permits only.

As of September 29, 2026, cross-state research lists Wyoming among the states with no state plumber license at all — plumbers are licensed by cities and counties.

What the research did confirm is municipal: the City of Casper licenses the plumbing trades, and Cheyenne's Contractor Licensing Board issues contractor licenses of its own.

No state agency issues a plumbing contractor license in our research: the Department of Fire Prevention and Electrical Safety licenses electricians and runs no plumbing or HVAC license program.

The issuing bodies the research verified are municipal.

The City of Casper licenses the plumbing trades — Apprentice, Journeyman and Master Plumbers, plus Gas Utility Installers — and, for the business, the Plumbing Contractor license.

Cheyenne works through its Contractor Licensing Board, which issues contractor licenses and determines the examination requirements for its qualified supervisor, plumbing and mechanical licenses.

Which contractor classes Cheyenne establishes for plumbing work is not established in our research — the board has the current class list.

The qualifier rule the research confirmed is Casper's: a Plumbing Contractor must have or employ a full-time licensed master plumber.

The master's own requirements are on the city's page too: a federally recognized plumbing apprenticeship certificate or four years in a Casper-licensed shop, plus five years as a journeyman or master in a Casper-licensed shop, and an approved ICC G27-N exam or equivalent.

The Journeyman Plumber rung beneath it needs an approved ICC exam — G27-N, G28-N or an equivalent — and a federally recognized apprenticeship or four years in a Casper-licensed shop.

Cheyenne licenses journeyman-level craft employees with at least 4 years / 8,000 hours of documented experience as a licensed apprentice, or certified equivalent training, plus a satisfactory exam — but whether a Cheyenne contractor license requires a full-time qualifier is not established in our research.

Our guide to the contractor license qualifier explains how these rules work where a license does require one.

No state exam appears in our research: with no state plumbing contractor license, we found no state trade exam and no business-and-law exam requirement.

Locally, Casper names approved exams for its plumber rungs: a Journeyman Plumber needs an approved International Code Council exam — G27-N, G28-N or an equivalent — and a Master Plumber needs ICC G27-N or an equivalent.

Cheyenne's Contractor Licensing Board determines the examination requirements for its qualified supervisor, plumbing and mechanical licenses, with ICC, the City, NICET and others listed as administrators.

What those exams cover is not established in our research, so get the current requirement from the city where you will apply.

The confirmed rule is Cheyenne's: a contractor license shall not be issued until a certificate of insurance has been filed with and approved by its Contractor Licensing Board.

The coverage minimums behind that certificate are an open question in our research — we could not confirm the amounts, so ask the board what it requires before you file.

For Casper's Plumbing Contractor license, our research established no bond or insurance amount — ask the city.

No statewide bond or insurance requirement for plumbing contractors appears in our research; where a city does require coverage, our guide to contractor license bonds and insurance explains how surety bonds and certificates of insurance work.

Casper's listed fees, first column as shown, are $300 for a mechanical/plumbing contractor, $75 for a master, $25 for a journeyman and $3 for an apprentice.

The city's table also shows a second, unlabelled column — $150.00 next to the contractor's $300.00 — that our research could not tie to a fee type, so ask Casper which applies before you budget.

Cheyenne's licenses renew annually: its fee schedule lists journeymen at $50 application, $30 initial license and $15 renewal, and master and qualified supervisor licenses at $50, $50 and $25.

A separate Cheyenne contractor-license fee is not established in our research — confirm the current schedule with the Contractor Licensing Board.

Not established in our research.

We found no reciprocity agreement covering Wyoming plumbing contractor licenses in the sources we checked, and the licenses the research confirmed are city-issued — Casper's and Cheyenne's.

Our research did not confirm how Casper or Cheyenne treats an out-of-state plumbing license or out-of-state experience.

Before you bid work across a state line, ask the building or licensing department in the city where the job is — it can tell you what it accepts.

In Casper, the requirement is that the business have or employ a full-time licensed master plumber, so if that master leaves, the business no longer has the person its license requires.

Our research does not describe Casper's process or deadline for naming a replacement, so confirm the steps with the city before the change happens.

One adjacent rule shows how tightly Casper ties credentials to employment: apprentice plumber licenses are issued to the plumbing contractor in the apprentice's name and are valid only while the apprentice works for that contractor.

For Cheyenne, our research did not establish a qualifier requirement for its contractor licenses, so there is no confirmed departure rule — ask the Contractor Licensing Board how it handles personnel changes.

The municipal programs our research verified are Casper's and Cheyenne's.

Casper licenses Apprentice, Journeyman and Master Plumbers, Gas Utility Installers and the Plumbing Contractor license, and ties apprentice licenses to the employing contractor.

Cheyenne's Contractor Licensing Board sets exams for its plumbing and qualified supervisor licenses, requires insurance approval before issuing a contractor license and renews licenses yearly.

Our research lists Laramie among the cities that may run their own trade-license programs, but it did not verify Laramie's program, so treat the city list as a starting point rather than a complete one.

There is no statewide Wyoming plumbing license lookup, so verifying a contractor means contacting the city — and other cities and counties may add their own plumbing requirements or permits.

The building or licensing department where the work is done is the authority; ask it what it requires of a plumbing business before you take the job.

For the individual plumber licenses themselves — apprentice, journeyman and master — our plumber licensing in Wyoming page covers the job-seeker side.