Colorado Plumber License Cost: Every Fee from Exam to Contractor Setup

The state fees for a Colorado plumber license are surprisingly modest — it's the municipal registrations, insurance premiums, and business setup costs that catch people off guard. Here's the full cost picture, broken down by stage so you can budget the entire path from apprentice to contractor.

State-Level DORA Fees

DORA's State Plumbing Board sets the individual licensing fees. The application fees below are one-time charges; the separate renewal fee is listed as well:

The renewal fee of $18 covers the full renewal cycle. Starting March 1, 2027, that cycle extends from two years to three years, so the per-year cost of maintaining your license actually drops.

PSI Exam Fees

You pay PSI Services directly — these fees are separate from DORA's application costs:

PSI exams are scheduled online. If you fail, the retest fee is $70; confirm PSI's current retest scheduling rules before booking. Long-term apprentices who've been registered for six or more years face a mandatory testing schedule (at least once every two years).

Contractor Registration Costs

If you're setting up a plumbing business, the state-level contractor registration adds another layer:

The contractor registration requires a designated active Master Plumber as the business's responsible master — that person must be a full-time W-2 employee. If you're the master and sole owner, you still need the business entity registered with the Secretary of State before DORA will process the contractor application.

Municipal Registration Fees

This is where the costs start varying widely. Colorado is a Home Rule state, and local building departments require separate contractor registrations before you can pull permits in their jurisdiction. Here are some of the major ones:

Every jurisdiction you work in requires its own registration. A contractor operating across the Denver metro, Colorado Springs, and Boulder areas could easily be maintaining three to five active municipal registrations simultaneously, each with its own fee schedule and renewal calendar.

Insurance Requirements

Municipal building departments won't issue a contractor registration without proof of insurance. The minimums vary by jurisdiction, but expect:

• Commercial General Liability: $600,000 to $1,000,000 per occurrence (Boulder County requires $600,000; City of Boulder requires $1,000,000/$2,000,000)
• Workers' Compensation: Mandatory for all employees. Corporate officers and LLC members who own at least 10% can file a formal rejection with CDLE, but the default is mandatory coverage. Noncompliance penalties can reach $500 per day.

Insurance premiums depend on your revenue, number of employees, claims history, and the specific work you do. For a small plumbing operation, general liability premiums typically run several thousand dollars per year. Workers' comp adds another layer based on your payroll.

The Total Picture

For someone going from scratch to a licensed journeyworker (the standard full-scope individual license), the hard state costs are:

• Apprentice registration: $30
• PSI exam: $75–$78
• License application: $120
• Total: roughly $225–$228

That's the floor. If you're going all the way through master and contractor setup in a single major metro area, the math looks more like:

• All of the above, plus master exam ($75–$78) and master application ($140)
• Contractor registration: $210
• LLC + SOS annual report: $75 first year
• One municipal registration: $250–$350
• Insurance premiums: several thousand per year
• Total first-year contractor setup: roughly $4,000–$8,000+ depending on your insurance quotes and how many municipalities you register in

The state licensing fees are the easy part. The municipal layer and insurance requirements are where careful planning makes the difference between a smooth launch and an expensive scramble.

For the complete fee reference — including less common charges like delinquency fees, reinstatement costs, and the specific insurance thresholds for Denver, PPRBD, Boulder, and other Colorado jurisdictions — the Colorado Plumber License Guide has the full breakdown organized by stage.

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