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Learn about our screening process

2 Years In Business

Company Details

  • Verified Licenses


  • Mon: 8:00 AM - 5:00 PM
  • Tue: 8:00 AM - 5:00 PM
  • Wed: 8:00 AM - 5:00 PM
  • Thu: 8:00 AM - 5:00 PM
  • Fri: 8:00 AM - 5:00 PM
  • Sat: Closed
  • Sun: Closed
View All Details & Credentials


Service Details

  • Residential Work
  • Commercial Work
  • Small Jobs Welcome

Areas of Expertise

  • Plumbing for remodels, additions, and upgrades around the whole house
  • High efficiency boiler installation and service
  • High efficiency tankless water heater installations, repairs, and service for your new installation
  • Excellent customer service backed up with a decade of experience while beating out the competition prices. While still giving those who served our country and community get a discount as well
  • Gas line installation, replacement, and repair
View All Offerings and Cities Served

Cost Information

  • Free Estimates
  • Warranty Offered
  • Trip Charge May Apply
  • Credit Cards Accepted


10 Verified Reviews
  • 5
  • 4
  • 3
  • 2
  • 1

Highly rated for

  • Quality
  • Value
  • Customer Service
Showing 1-10 of 10 results
4.5 Richard G. Boulder, CO

Kelly is the owner and plumber for Knock Out. He did a fine job installing our new boiler, and had to overcome some problems along the way. I would recommend him highly.

5.0 Lindsey T. Jamestown, CO

Excellent communicator, very professional, and all around great human. Kelly helped us ideate through options and walked us through context in his decision making. I will hire him next time we need service without a doubt.

5.0 Tyler K. Denver, CO

Super professional and great communication! Walked me through the whole install on my tankless water heater. Even gave me a teacher discount! Would recommend!

5.0 Manuel M. Commerce City, CO

Does a good job in good time. Quality work

5.0 Hailey B. Denver, CO

Kelly quickly found us a spot in his schedule to come help us relocate a gas pipe in our old Denver basement. He worked quickly, despite an old pipe cracking, and got the job done and up to code in a day. I would recommend.

5.0 Steven M. Louisville, CO

It was a pleasure to interact with Kelly who did excellent work to replace our water heater expansion tank.

5.0 D G. Broomfield, CO

They came up with a solution w the least amount of damage to my walls, ceiling and floors. I had an outlet out on my fireplace wall And itâ s perfect. They even put the tv up, center my tv mount too. Above and beyond the call of duty. Thank you for great work. Good price and friendly demeanor.

5.0 Ed S. Boulder, CO

Kelly arrived on time and completed the work quickly.

5.0 Matthew K. Longmont, CO

My tank broke over Saturday night. Kelly was there Sunday morning and went straight to work. I need water lines and my gas line moved to the new location. He quoted me 10-11 hours and got it done in 8. Very professional from I stal to customer service. I will definitely hire home to complete some plumbing in my house. â­ ï¸ â­ ï¸ â­ ï¸ â­ ï¸ â­ ï¸

5.0 Michael O. Greeley, CO

On time,finished ahead of schedule and very affordable.


Knock Out Mechanical

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HomeAdvisor verifies state-level licensing where applicable - note: some states require local or county level licensing and you should verify whether or not your pro is properly licensed.
To find more licensing information for your state, visit our Licensing Requirements page.

Seal of Approval

What is the screening process that Service Professionals go through in order to become members of the HomeAdvisor network?

  1. Verify Trade License
    HomeAdvisor checks to see if the business carries the appropriate state-level license.
  2. Verify Insurance
    As a part of our screening process, we encourage professionals to carry general liability insurance. We require coverage for hundreds of services.
  3. Verification of State Business Filings
    For business types that require a Secretary of State filing, we confirm that the business is in good standing in the state in which it is located.
  4. Criminal Records Search
    HomeAdvisor uses 3rd party data sources to conduct a criminal search for any relevant criminal activity associated with the owner/principal of the business.
  5. Sex Offender Search
    We confirm that the owner/principal is not listed on the official state Sex Offender web site in the state in which the owner/principal of the company is located.
  6. Bankruptcy Search
    We use 3rd party data sources to check the history of the principal/owner of the business for bankruptcy filings by or against them.
  7. Legal Search for Civil Judgments
    We use 3rd party data sources to check the principal/owner of the business for state level civil legal judgments entered against them.
  8. Liens Search
    We use 3rd party data sources to check the principal/owner of the business for liens placed against them.
  9. Identity Verification (SSN)
    HomeAdvisor verifies the social security number(s) of the owner/principal for identity check purposes. This check applies primarily to smaller business entities.
  10. Identity Verification (Reverse Phone Lookup)
    We conduct a reverse business phone lookup to identify records matching the phone number information provided by the business.

NOTE: Member service professional information confirmed as described above may change or expire over time; while HomeAdvisor attempts to maintain accurate and up-to-date information, and confirms changes when notified, we cannot guarantee that profile and screening information is accurate. Therefore, we recommend that before working with a service professional you verify that information presented is still current and/or acceptable to you.
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