Why does a dishwasher have to drain through the sink plumbing?

• <div><p>Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.</p></div>

How long will it take to install my dishwasher?

• <div><p>Installing a dishwasher should take one to four hours, depending on the complexity of the installation and whether you DIY or hire a pro. Even if you're particularly handy, installing a dishwasher on your own will likely take longer — at least two hours. On the other hand, a professional can likely install a dishwasher in about an hour. Installation time will take longer if you have to remove an existing dishwasher, reroute plumbing, or repair damaged flooring underneath the appliance.</p></div>

Best dishwasher installation pros near High Ridge, MO

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Verified Reviews for Dishwasher Installation pros in High Ridge, MO

*The Angi rating for Dishwasher Installation companies in High Ridge, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

*The HomeAdvisor rating for Dishwasher Installation companies in High Ridge, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

Last update on June 13, 2025

Reviewed in June 2025
I hired this pro because he was honest about how difficult it is to deal with cutting tile around faucets in these old houses. He recommended cutting a big portion so the tile could be repaired if it broke but I would need a tile person to come in and fill in the tile. When he heard it was my...
Parkers Plumbing, LLC
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Reviewed in May 2025
S&S Flip LLC was on time, clear with their estimate, and walked through each step of what is going to be done. We had them install our dishwasher, install kitchen hardware, and fully repainting our new home. Highly recommend their services, and the fact they beat any other contractors...
S&S Flip LLC
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Reviewed in December 2024
Installers very friendly and did a beautiful job.
Midtown Home Improvements, Inc. (St. Louis)
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Reviewed in June 2024
Helped install a tricky dishwasher and water heater! Super attentive especially through setbacks.
DIY Pros
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Reviewed in May 2024
Paul was kind enough to point out that he had noticed our gutters were clogged and he fixed those too. He also leveled our dishwasher with no increase in the fee heâ d quoted for installing our microwave.
Pauls Honey Do Service
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Reviewed in March 2024
They made it easy and did an excellent job with install/cleaning
Reliance Roofing & Exteriors
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Reviewed in January 2023
Ended up with a Replaced garbage disposal. Came to check a leaky dishwasher. Said dishwasher wasn’t leaking but it is. So they were wrong
All American Appliance Service Inc
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Reviewed in June 2022
Our installer was very easy to work with, and was eager to accomplish what we asked for. Great guy.
Quality Flooring
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Reviewed in July 2021
Experienced installer that worked quickly and efficiently.
CVM Enterprises, Inc.
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Reviewed in July 2021
Timely and competent installation of a new dishwasher
Big 10 Plumbing and Electric
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Top-Rated Dishwasher installation pros in High Ridge - Updated Nov 2026

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Dishwasher Installation FAQs, answered by experts

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

Leaks, poor drainage, failure to start, water not heating, and excessive noise frequently require service.

Yes, vinegar is an excellent homemade solution to clean a dishwasher. Its acidity will cut through any buildup, while its natural deodorizing capabilities will take care of any nasty smells.

Installing a dishwasher should take one to four hours, depending on the complexity of the installation and whether you DIY or hire a pro. Even if you're particularly handy, installing a dishwasher on your own will likely take longer — at least two hours. On the other hand, a professional can likely install a dishwasher in about an hour. Installation time will take longer if you have to remove an existing dishwasher, reroute plumbing, or repair damaged flooring underneath the appliance.

Basic maintenance, such as cleaning filters, is DIY-friendly, but repairs involving electrical components, pumps, or valves should be handled by a professional.

The High Ridge, MO homeowners’ guide to dishwasher installation services

From average costs to expert advice, get all the answers you need to get your job done.

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