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SEATTLE PLUMBER | KNOCKOUT PLUMBING & MECHANICAL

Call / text us now for immediate plumbing services.

Seattle's family owned plumbing experts

Call or Text us anytime for plumbing assistance

“Screened & Approved by HomeAdvisor”
Backed by 5-star Google Reviews – Licensed, Bonded & Insured

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About Us:

Knockout Plumbing: A dedicated team of skilled professionals

Knockout Plumbing is a family-owned plumbing company proudly serving Seattle since 2006. We specialize in residential remodels, hot water heaters, sewer repairs, repiping, and fixture installations, — handling everything from routine maintenance to complete plumbing system installs. Whether you’re a homeowner, home builder, or business owner in the Greater Seattle area, our experienced team is committed to providing high-quality, cost-effective service tailored to your needs. With a deep understanding of Seattle homes and a passion for excellence, we’re here to knock it out — every time.

Knockout Plumbing is a family-owned plumbing company proudly serving Seattle since 2006. We specialize in residential remodels, hot water heaters, sewer repairs, repiping, and fixture installations, — handling everything from routine maintenance to complete plumbing system installs. Whether you’re a homeowner, home builder, or business owner in the Greater Seattle area, our team is ready to Knock-It-Out!


Services:

01.

Drain Cleaning & Sewer Repairs

Quickly resolve clogs, backups, and damaged sewer lines with professional drain cleaning and sewer repair services. We use hydro jetting, camera inspections, and expert troubleshooting to keep your pipes flowing.

02.

Gas Line Services

From leak detection to full replacements, our certified technicians keep your gas lines running safely and efficiently throughout Seattle.

03.

Water Heater Services

Get reliable hot water fast with our quick, high-quality water heater replacements—installed by Seattle’s trusted plumbing experts.

04.

Remodeling & re-pipe

Planning a kitchen or bath remodel? Need to upgrade old pipes? We handle re-piping and plumbing upgrades for seamless, code-compliant results.

05.

Leak Detection & Pipe Repair

Stop hidden leaks and burst pipes before they cause major damage. We specialize in pinpointing issues quickly and delivering lasting repairs.

06.

5. Sump Pumps & Outdoor Drainage

Protect your property from flooding with reliable sump pump installations and exterior drainage solutions tailored to Seattle’s wet climate.

FAQ

  • Seattle

  • Everett

  • Bothell

  • Snohomish

  • Woodinville

  • Lake Stevens

  • Lake Forest Park

  • Kenmore

  • Bellevue

  • Kirkland

  • Renton

  • Kent

  • Federal Way

  • Marysville


 

We offer immediate plumbing, emergency plumbing, and are available now – just give us a call or fill out our form and someone from our team will call you shortly! We are real people on the other end of the line, always available to chat.

🚿 Remodeling & Repiping:

  • Kitchen remodel plumbing, including fixture relocation and new layouts

  • Bathroom remodel plumbing, including tub, shower, and vanity relocation

  • Laundry room additions and plumbing rough-ins

  • ADU & DADU plumbing rough-ins for accessory dwelling units

  • Full-home repipes to replace aging or failing plumbing systems

  • Water and drain line rerouting for remodels or damaged lines

  • Valve replacements and upgrades

🛠️ Sewer & Water Line Services:

  • Sewer line repair and replacement

  • Water main repair and replacement

  • Leak detection and pipe repair

  • Outdoor drainage solutions to protect your property

🔥 Water Heaters & Gas Lines:

  • Gas, electric, tankless, and combi-boiler water heater installation and replacement

  • Gas line installation and repairs

💧 Pumps & Emergency Services:

  • Sump pump installation and replacement

  • Emergency plumbing services for urgent issues

At Knockout Plumbing & Mechanical, we deliver the same professional expertise as the big commercial plumbing companies — but with a level of personal attention, honesty, and responsiveness they simply can’t match. As a locally owned and operated plumbing company in Seattle, we genuinely care about our customers and our community. You’ll never feel like “just another number” when you work with us.

We offer competitive, transparent pricing and high-quality workmanship on every job — from small repairs to full-home repipes and sewer replacements. Unlike some national chains, we don’t cut corners, overbook, or upcharge you for unnecessary services. Instead, we take the time to understand your needs, explain your options, and get the job done right the first time.

If you’re looking for a trusted, reliable plumbing company in Seattle that combines big-company expertise with small-business integrity and care, Knockout Plumbing & Mechanical is the right choice for your home or business.


 

need immediate plumbing help?

Call or Text us at (206) 858-2211

Small Team. Big Standards. Not a Franchise—Just a Trustworthy Plumbing Company who Proudly Serves the city of Seattle.

Simone
Simone ⭐⭐⭐⭐⭐
Zach is a consummate professional. He was thorough, timely, efficient, personable, and diligent. He returned the next day after the job to place a cover on a part, which is something my partner & I wouldn’t have known. Clearly, he has integrity, which in my book is paramount. We emphatically would not recommend anyone else, but him and his team for plumbing jobs. We were beyond pleased with Zach’s skill and caliber. 20/10 ⭐️
Simone
Simone⭐⭐⭐⭐⭐
Zach is a consummate professional. He was thorough, timely, efficient, personable, and diligent. He returned the next day after the job to place a cover on a part, which is something my partner & I wouldn’t have known. Clearly, he has integrity, which in my book is paramount. We emphatically would not recommend anyone else, but him and his team for plumbing jobs. We were beyond pleased with Zach’s skill and caliber. 20/10 ⭐️
Evan Wiederspan
Evan Wiederspan⭐⭐⭐⭐⭐
Zack and his crew replaced my kitchen sink drain after it started leaking. I was really happy with the price, and the speed and quality of their work. It was also easy to get a quote and schedule over the phone. I would definitely hire Knockout Plumbing again in the future!
Michael Johnson
Michael Johnson⭐⭐⭐⭐⭐
Zach has done a number of plumbing jobs for us over the years ranging from large bathroom additions to smaller repairs, every time they've been top quality. I highly recommend Knockout!
Balavignesh K.
Balavignesh K.⭐⭐⭐⭐⭐
Knockout Plumbing did a great job installing my new water heater.
 Michael Bacus
Michael Bacus⭐⭐⭐⭐⭐
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 🙂
"Updating since I just used knockout plumbing again. Great service. Diagnosed the issue quickly and charged me minimal for the trip out. Will continue to use. First time: Great service. Came fast. They basically taught me how to use my house as a newer home-owner. And didn’t charge me the full fee since it was a simple task. Gave me tips to prevent issues. Knowledgable so will use again!"
-Jane Murphy
"There is nothing but great things to talk about this experience from beginning to end. I leave a message - Colin calls me back and we discuss the projects. He calmly addresses a plan. We get it scheduled, he shows up, does great work, answers my questions, and leaves everything looking and working great. No hesitation, hands downs, highly recommend Knockout Plumbing!"
-Dale Hoistad
"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."
- Daniel A.
Simone
Simone ⭐⭐⭐⭐⭐
Zach is a consummate professional. He was thorough, timely, efficient, personable, and diligent. He returned the next day after the job to place a cover on a part, which is something my partner & I wouldn’t have known. Clearly, he has integrity, which in my book is paramount. We emphatically would not recommend anyone else, but him and his team for plumbing jobs. We were beyond pleased with Zach’s skill and caliber. 20/10 ⭐️
Simone
Simone⭐⭐⭐⭐⭐
Zach is a consummate professional. He was thorough, timely, efficient, personable, and diligent. He returned the next day after the job to place a cover on a part, which is something my partner & I wouldn’t have known. Clearly, he has integrity, which in my book is paramount. We emphatically would not recommend anyone else, but him and his team for plumbing jobs. We were beyond pleased with Zach’s skill and caliber. 20/10 ⭐️
Evan Wiederspan
Evan Wiederspan⭐⭐⭐⭐⭐
Zack and his crew replaced my kitchen sink drain after it started leaking. I was really happy with the price, and the speed and quality of their work. It was also easy to get a quote and schedule over the phone. I would definitely hire Knockout Plumbing again in the future!
Michael Johnson
Michael Johnson⭐⭐⭐⭐⭐
Zach has done a number of plumbing jobs for us over the years ranging from large bathroom additions to smaller repairs, every time they've been top quality. I highly recommend Knockout!
Balavignesh K.
Balavignesh K.⭐⭐⭐⭐⭐
Knockout Plumbing did a great job installing my new water heater.
 Michael Bacus
Michael Bacus⭐⭐⭐⭐⭐
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 🙂