Do you need a license to work as a plumber in Colorado?
Yes. In Colorado, a residential, journeyworker or master plumber needs a license from the Division of Professions and Occupations, and a plumbing contractor must register with the State Plumbing Board and be or employ full-time a master plumber. An individual may do plumbing on their own property or residence without a license, but rental property occupied or to be occupied by tenants remains subject to the licensing provisions. Since July 1, 2025, a plumbing contractor must display its Colorado registration number and that of its master plumber on its vehicles, billing materials, bid sheets and website. This is C.R.S. §§ 12-155-108, 12-155-118, 12-155-125, 12-20-102.
| What | Colorado |
|---|---|
| Plumber license | State plumber license + contractor registration |
Source
C.R.S. §§ 12-155-108, 12-155-118, 12-155-125, 12-20-102
Read the statute in the Colorado Revised Statutes (Colorado General Assembly): leg.colorado.gov.
Checked against the statute on November 13, 2026.
This is a summary of a published statute, not legal advice. Rules change, local ordinances can add to them, and the terms of a specific lease may differ. Check the citation and speak to a lawyer before acting.
How Seayora uses this rule
A contractor on Seayora keeps each license with its issuing state, its expiry date and the last four digits of its number, and the business is warned before one lapses — on the website and both phone apps. A customer finding a pro on Seayora sees whether a license is on file.
Guides on this rule
- Contractor License Requirements by State: Every Trade — Which states require a state license for electricians, plumbers, HVAC, general and home improvement contractors, with the statute for each.
Compare this rule in every state
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The same question in other states
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Connecticut
- Delaware
- District of Columbia
- Florida
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- Hawaii
- Idaho