Knockout Plumbing & Mechanical, LLC

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Learn about our screening process

5 Years In Business

Company Details

  • Verified Licenses


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Service Details

  • Residential Work
  • Commercial Work

Areas of Expertise

  • Plumbing
  • Mechanical/Gas
  • Drain Clog or Blockage - Camera Locate
  • Remodels
View All Offerings and Cities Served

Cost Information

  • Free Estimates
  • Credit Cards Accepted


11 Verified Reviews*
  • 5
  • 4
  • 3
  • 2
  • 1

Highly rated for

  • Quality
  • Value
  • Customer Service
*Reviews imported from Google have not been individually verified by HomeAdvisor.
Showing 1-10 of 11 results
5.0 Suzanne D. Kirkland, WA

I found the leak in the attic and knew exactly where to find it. I had to let them go through my room ceiling after looking at where the burst was located. No way they could get to it any other way. Job done in an hour. Is $1k to expensive? When 1000's are experiencing the same issue? No you do what you need to do to come back online. I was happy with their business. They explained how to avoid this in the future.

5.0 Bob F. Bellevue, WA

excellent service

5.0 Vanessa V. Seattle, WA

Great experience working with Colin on installing a gas line for our kitchen. We got three bids and theirs was almost the lowest but I got such great vibes from Colin it was an easy choice. Looking forward to working with them again!

5.0 Daniel Ash Google Review

I had an emergency waterline leak situation. I called several companies. Knockout was the first to respond and came quickly. They were professional, fair, and very communicative throughout the process. I am very happy with how it all turned out. I will call them again in the future.

4.0 Garrett B. Seattle, WA


5.0 Michael Bacus Google Review

I got a couple quotes for a rough-in plumbing job on our permitted addition in Bellevue(ADU kitchen, bath and laundry plus water heater and kitchenette). We ended up going with Knockout Plumbing. Zach, Colin, Jon and Shannon were all a pleasure to deal with. They really went out of their way to make sure I was happy. Plumbing passed city inspections on the first inspection. Thanks Knockout :)

5.0 Kurt N.

They did a great job and would highly recommend their service,

5.0 Jeremy W.

Their work was done right, fantastic customer service.

5.0 Sa Ngu Google Review

Josh replaced my sink faucet which was dripping for months. He was respectful and helpful in every way. It was extremely refreshing to deal with a plumber who has manners, good communication skills, as well as proficiency. I can’t say enough how grateful I am that we found him.

5.0 Deyette Swegle Google Review

We woke up to a flooded basement due to leaking water heater and a discovered we also had a faulty water valve. We called Knockout Plumbing and they were able to come out and give us a quote, get the parts and install all in the same day. We appreciate their speedy response excellent workmanship and fair price!


Knockout Plumbing & Mechanical, LLC
Water Main/Sewer
New Construction/Rough in
Bathroom Remodel

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  1. Verify Trade License
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  3. Verification of State Business Filings
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