Plumbers in Boulder, CO

Compare 100 plumbers in Boulder by HomeProFax Score v2 (license, discipline, permits, BBB + HomeProFax reviews). Always verify license status with the issuing board before hiring.

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Plumbers in Boulder: what the records show

Boulder has 209 plumbing license holders in our DORA data, and 63 are active. 28 of them are active plumbing contractor registrations, the businesses that can contract plumbing work with you directly. 6 Boulder plumbing records carry a board discipline flag.

Shortcut: ask any Boulder contractor for their verified HomeProFax report. See all Boulder contractor data.

How to hire in Boulder

Check the license is active, look at permit history for jobs like yours, read the BBB and HomeProFax review components in the score breakdown, and use the outbound Google/BBB links on each profile to cross-check external reviews (we link out — we do not store Angi, Yelp or Google ratings).

By the numbers

Counts are HomeProFax profiles with a Boulder address, from the DORA plumbing roster (refreshed Oct 21, 2026) and City of Boulder open permit data, matched through the City of Boulder licensed-contractor register (CC0). Boulder is the deepest permit coverage we have in Colorado.

Why Boulder plumber reports go deeper

Boulder publishes its construction permits and its licensed-contractor register as open data. That lets us match permits to the right company using the business name plus a phone number, ZIP or city, not just a name. The 26 Boulder plumbing profiles with permits on file carry 6,229 permits between them, so you can see how often a company actually works in town and on what kind of job.

The license itself still comes from the state. Plumbers in Colorado are licensed by the DORA State Plumbing Board; Boulder also keeps its own contractor register for businesses that pull permits in the city.

Boulder's numbers lean heavily toward expired records (144 of 206), because the state roster keeps people who have left the trade or the area. The active ones are listed first.

What to ask for before you hire

You don't need to spend an evening on government lookup screens. Ask the plumber you're considering for their HomeProFax report. It puts the license record, any board discipline flag, permits on file and outside links on one page, with sources. A contractor with a clean record can share it in a minute. If one won't, that tells you something too.

Search any business name free on HomeProFax.com if they haven't shared it yet.

Boulder jobs where permits matter

• Water heater and boiler replacements: older Boulder homes often have gas appliances that need a permitted, inspected swap.
• Heat pump and electrification projects: these often involve a plumber, an electrician and a mechanical contractor, each with its own permit.
• Sewer lateral repairs: ask who handles the right-of-way permit.

A company with dozens of Boulder permits on its report has a track record in town you can actually see.

More in Boulder: all Boulder contractors. Nearby: Denver plumbers, Colorado Springs plumbers. Statewide: Colorado.

Plumbers in Boulder — common questions

Do plumbers need a license in Boulder?

Yes. Plumbers in Colorado are licensed by the state through the DORA State Plumbing Board. Businesses that pull permits in Boulder also appear on the City of Boulder licensed-contractor register.

How many Boulder plumbers have permits on record?

26 of the 206 Boulder plumber profiles on HomeProFax have City of Boulder permits on file, 6,229 permits in total.

How does HomeProFax match Boulder permits to a plumber?

Through the City of Boulder licensed-contractor register: same business name plus a matching phone number, ZIP or city. Name-only matches are not used.

What should I ask a Boulder plumber for?

Their HomeProFax report, which shows the state license, any discipline flag and their Boulder permit history on one page.

How many active plumbing contractors are based in Boulder?

28 active plumbing contractor registrations and 63 active plumbing licenses in total have a Boulder address in HomeProFax's DORA data.

How do I check if a Boulder contractor is licensed?

Open any profile above to see its license status, issuing board and expiry date from public records, then verify it with the Colorado DORA State Plumbing Board, which licenses plumbers statewide, before you hire. You can also search a business name or license number on HomeProFax.

How many plumbers are listed in Boulder?

This page lists 100 plumbers in Boulder, ranked by HomeProFax Score v2.

What does the HomeProFax score mean?

The score (0-100) sums license status (35), discipline and legal flags (20), permit history (20), and BBB plus HomeProFax homeowner reviews (25). It is not a rating of workmanship. See how scores work.