About John / Our story
About Underhill Plumbing Services, Thornton, Colorado
Underhill Plumbing Services is a residential plumbing company in Thornton, Colorado, owned by John Kuykendall, a Colorado Master Plumber (License #03002471). We work on water heaters, tankless units, fixtures and leaks in homes across the Denver Metro.
Who's behind it
Underhill Plumbing Services is John Kuykendall's company. John is the responsible Master Plumber for the business, and the Master Plumber license number shown on this site is his.
We're a new company. That means no wall of reviews yet and no history to point to, so the best we can do is show real work and answer questions straight. Every photo on this site is from one of John's jobs.
What we aim for
- Plain answers. What's wrong, what the options are, and what we'd do if it were our house.
- Options, not pressure. If a repair makes more sense than a replacement, you'll hear that.
- A clear focus. Homes first, and a list of services we know well. Light commercial jobs are considered case by case.
The name
People ask. Yes, the name is a nod to a certain traveling hobbit. The plumbing, we take seriously.
What we work on
Water Heater Repair & Replacement
Tank water heaters that leak, run out of hot water or won't light. Repaired when it makes sense, replaced when it doesn't.
Tankless Water Heaters
Wall-mounted tankless installs sized for Colorado winters, plus repair and descaling for the units you already have.
Faucets, Toilets & Fixtures
Dripping faucets, running toilets, tired shower valves and new fixtures you've picked out.
Leak & Pipe Repair
Pinhole leaks, failed fittings, frozen and split pipes, leaking shutoff valves and supply lines.
Whole-Home Water Filtration
Whole-house filtration and scale control installed where water enters your home, including HALO systems.
Gas Line Repair
Leaking gas valves and fittings, damaged gas pipe, and gas lines for water heaters and tankless units.
24-Hour Emergency Plumbing
Burst pipes, active leaks and water heater failures that can't wait.
Where we work
Based in Thornton, serving the Denver Metro area.
Recent work
Photos from John's jobs: water heaters, filtration systems and copper piping.
Something leaking, dripping or cold?
Call and tell us what's going on, or pick a time online. If it's not something we handle, we'll say so.