Colorado Plumbing License: Tiers,
Exams and How to Qualify

Colorado plumber license at a glance

This guide is general information about Colorado licensing, not legal advice. Colorado State Plumbing Boardrules, fees and deadlines change — confirm your own position with the board, or with a licensed attorney, before you rely on anything here.

Colorado plumber license types: the full Colorado State Plumbing Board ladder

The ladder in Colorado runs apprentice, journey-level, master, with a separate business credential for contracting to the public. Colorado registers apprentices with the board from the outset, and the board's rules govern the ratio of apprentices to licensed plumbers on a job, so your hours only count when the supervision arrangement complies. Colorado also requires a plumbing contractor registration for the business, distinct from the individual master licence that qualifies it.

Exact experience hours and fees vary by license type and can change, confirm current requirements on the Colorado State Plumbing Board Plumber program page.

Colorado journey-level vs Colorado master Plumber in Colorado, what is the difference?

How do you get a Colorado journey-level Plumber license?

1. 1

   Register with the Colorado State Plumbing Board before you start logging hours

   Colorado counts supervised experience, but it counts it on the Colorado State Plumbing Board, Division of Professions and Occupations (DORA)'s terms. Register as an apprentice at the outset, work under a licensed plumber in the supervision arrangement the rules require, and keep your own record of hours and employers alongside whatever your employer files. Plumbers who accrue years of good experience without registration are the ones who discover the problem at application time, when reconstructing the paperwork is hardest.

2. 2

   Build verifiable supervised experience

   Plumbing licensing everywhere rests on time under supervision, and Colorado is no exception. Registered apprenticeship through a UA local or a state-approved programme is the cleanest route, because it produces classroom instruction and documented hours in a form the Colorado State Plumbing Board recognises, and it is paid throughout. Whatever route you take, the test at the end is whether someone with direct knowledge of your work can verify it, so keep employer records, pay records and job descriptions.

3. 3

   Prepare for the code examination the Colorado State Plumbing Board uses

   The examination is built on the plumbing code Colorado enforces, with state and sometimes local amendments layered on top, and it covers water supply and distribution, drain, waste and vent systems, sizing and venting, isometrics, gas piping where the credential includes it, backflow prevention and safety. It never covers the electrical code. Colorado registers apprentices with the board from the outset, and the board's rules govern the ratio of apprentices to licensed plumbers on a job, so your hours only count when the supervision arrangement complies. Colorado also requires a plumbing contractor registration for the business, distinct from the individual master licence that qualifies it. Confirm the current adopted code and edition with the Colorado State Plumbing Board before buying a code book, because an out-of-date edition is a common and avoidable reason to fail.

4. 4

   Apply, sit the examination and receive the credential

   File the application with the Colorado State Plumbing Board, Division of Professions and Occupations (DORA), with your verified experience, identification and the current fee, and sit the examination once you are approved. Fees, application review times and examination scheduling are set by the Colorado State Plumbing Board and by whichever testing vendor it contracts, and both change — take the current figures from the board rather than from a third-party summary. DORA's licensee lookup covers plumbers alongside Colorado's other regulated professions, showing licence type, status, expiry and any board discipline.

5. 5

   Move up the ladder, then add the business credential if you contract

   The journey-level licence is not the end of the ladder. Colorado sets an additional period of journey-level experience before the master examination, and the master tier is what carries design, supervision and, in most jurisdictions, permit-pulling authority. Contracting plumbing work to the public is a further step again, requiring the business credential with liability insurance and a bond. Renew everything on the Colorado State Plumbing Board's cycle and complete any continuing education it requires — a lapsed licence stops work immediately and reinstatement takes longer than renewal.

Does a Colorado plumber license transfer to other states?

Plumbing reciprocity is real but narrow. Where Colorado has arrangements, they typically apply to a specific licence class held actively and in good standing for a defined period in a state whose requirements the Colorado State Plumbing Board, Division of Professions and Occupations (DORA) considers substantially equivalent, and they usually waive the trade examination rather than the whole application — expect the business or law portion, the fee, the experience verification and any state-specific requirements to remain. The states covered and the classes covered change, and an arrangement that existed when a colleague moved may not exist now. Confirm the current position with the Colorado State Plumbing Board before relying on an out-of-state licence, and do not let the original licence lapse in the meantime, because it is usually the basis the application rests on.

Reciprocity agreements change, always confirm the current list and requirements on the Colorado State Plumbing Board Plumber program page before applying.

How much does a Colorado plumber license cost, and how long does it take?

The apprenticeship is the real investment and it is paid, so most Colorado plumbers reach licensure without tuition debt. The fees to budget for are the application and examination fees charged by the Colorado State Plumbing Board, Division of Professions and Occupations (DORA) and whichever testing vendor it contracts, the code book for the current adopted edition, and renewal with any continuing education. A business contracting to the public adds liability insurance and a bond, priced as an annual premium rather than the face amount. Every one of these is set separately and revised periodically, so take current figures from the Colorado State Plumbing Board's published fee schedule rather than from a third-party total.

Colorado plumbing exam content and license verification

What does the Colorado exam cover, and how do you check a licence?

There is no national plumbing examination. Colorado tests you on the plumbing code it enforces, with state amendments, covering water supply and distribution, drain, waste and vent systems, fixture and pipe sizing, venting, drainage isometrics, gas piping where the credential covers it, backflow prevention and safety. Colorado registers apprentices with the board from the outset, and the board's rules govern the ratio of apprentices to licensed plumbers on a job, so your hours only count when the supervision arrangement complies. Colorado also requires a plumbing contractor registration for the business, distinct from the individual master licence that qualifies it. Boards contract testing to vendors such as PSI, Prometric or ICC or administer examinations themselves, and whether the examination is open book with an approved code book — as many plumbing examinations are — is set by the Colorado State Plumbing Board rather than nationally. Confirm the current adopted code edition, the testing vendor and the passing standard with the Colorado State Plumbing Board, Division of Professions and Occupations (DORA) before scheduling, because all three are revised periodically and an out-of-date code book is a common cause of an avoidable failure.

How to verify a Colorado plumber license

DORA's licensee lookup covers plumbers alongside Colorado's other regulated professions, showing licence type, status, expiry and any board discipline. Check the credential type rather than merely that one exists: in plumbing the difference between an individual licence, a business credential and a specialty endorsement determines what the holder may lawfully do, and a customer or general contractor checking only that "he's licensed" learns very little. Confirm the status and expiry too, and where a business is contracting the work, confirm its liability insurance and bond as well as its licence. GlobalCybers verifies every candidate's credentials before they reach your portal.

How do you get a plumbing license in Colorado?

Colorado licenses individual plumbers statewide through the Colorado State Plumbing Board at the Division of Professions and Occupations, running a full apprentice, journeyman and master ladder alongside a separate plumbing contractor registration. Register as an apprentice with the Colorado State Plumbing Board so your supervised hours count, accrue the experience

the board requires under a licensed plumber with the related classroom instruction, then apply and pass the examination on the plumbing code Colorado enforces. The master tier follows after further journey-level experience. Verify the current requirements with the Colorado State Plumbing Board, Division of Professions and Occupations (DORA) before committing time or money.

Does Colorado have a journeyman plumber license?

Yes. Colorado licenses individual plumbers at journey level through the Colorado State Plumbing Board, Division of Professions and Occupations (DORA), and it is the credential employers hire on here. It sits above registered apprentice and below master, and it authorises independent work on most plumbing installations.

Colorado registers apprentices with the board from the outset, and the board's rules govern the ratio of apprentices to licensed plumbers on a job, so your hours only count when the supervision arrangement complies. Colorado also requires a plumbing contractor registration for the business, distinct from the individual master licence that qualifies it.

Colorado Plumber licenses, Frequently Asked Questions

Colorado State Plumbing Board, Division of Professions and Occupations (DORA) · IAPMO, Uniform Plumbing Code · International Code Council, International Plumbing Code · U.S. Department of Labor, Registered Apprenticeship · U.S. Bureau of Labor Statistics, OEWS May 2025 (47-2152). Fees and rules can change, confirm current details at dpo.colorado.gov/Plumbing before applying.

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