Get matched with top basement waterproofing pros in Union Gap, WA

Q: What are the most expensive parts of finishing a basement?

• <div><p>Anything having to do with the structure of your home, such as raising the ceiling, is usually the most expensive part of finishing a basement. Another project component that could be a surprisingly high expense is adding an exterior entrance. </p><p>The <a href="https://www.angi.com/articles/what-average-cost-add-exitwalk-out-my-finished-basement.htm">cost of a walkout basement</a> can be anywhere from $5,000 to $35,000.</p></div>

Q: How can I prevent future water accumulation issues?

• <div><p>Preventing water accumulation involves regular inspections, maintaining effective drainage systems, ensuring proper roof maintenance, and taking preventive measures against heavy rainfall or floods.</p></div>

Q: How often do you need to clean your crawl space?

• <div><p>Plan on cleaning your crawl space at least once a year, though twice a year is ideal. During the cleaning, remove any debris or dust and check for potential issues like pest infestations or water damage. The sooner you catch these issues, the easier (and cheaper) it will be to fix them.</p></div>

Q: Can you add a bathroom to an unfinished basement?

• <div><p>Yes, you can add a bathroom to an unfinished basement, but you&rsquo;ll want to take proper precautions if doing so. As with any bathroom addition, you&rsquo;ll need to make sure that it&rsquo;s approved by local building authorities first. With unfinished basements, you especially need to keep an eye on proper ventilation practices.</p></div>

Q: What are signs that I need to waterproof my basement?

• <div><p>Due to the nature of basements, some level of waterproofing is necessary to prevent water from seeping in and causing damage. Some definitive signs that your basement needs waterproofing measures or needs existing waterproofing measures need to be updated include:</p><ul><li><p>Water in your basement, including damp walls or puddles on the floor</p></li><li><p>Mold spots in your basement</p></li><li><p>Musty smells or odors</p></li><li><p>Warped doors or walls</p></li><li><p>Cracks in walls</p></li><li><p>Insect issues, such as cockroaches and termites</p></li></ul><p></p></div>

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Verified Reviews for Basement Waterproofing pros in Union Gap, WA

*The Angi rating for Basement Waterproofing companies in Union Gap, WA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

*The HomeAdvisor rating for Basement Waterproofing companies in Union Gap, WA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

Last update on February 17, 2026

Reviewed in February 2026
Bryan and his team did an amazing job of drying up and replacing our floor and baseboards after a small sump pump leak in our basement room. Thoughout the job they send updates and pictures and always replied to phone calls and text messages. I really appreciate their work and communication.
Rehab Renovations, Inc.
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Reviewed in April 2025
We used Joes Yard Service for repair to our underground sprinkler system. They did a great job. Gave us an estimate, date to be done and how much time it would take to do the job. They were on time, did the job in one day and cost was as per their estimate. We will indeed use them again...
Joe
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Reviewed in March 2023
After my basement flooded, I was in need of a good flooring installer to finish out my basement. Aaron (the owner) came highly recommended from a work colleague. I am very happy with the work. Great price, and he was in and out in two days! Couldn't ask for better contractor!
Nailed Construction LLC
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Reviewed in July 2021
Sam and his crew prepped and painted my house in a timely professional manner at a good price, I would highly recommend them.
S & R General Contractors, LLC
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Reviewed in November 2020
DVR construction did an incredible job. Bobby was the primary person that did the work and he did a great job. Daniel, the owner, is a very personable person and strides to make sure his clients are happy and goes out of the way to make sure that his clients are happy with the work. Our...
D&R builders LLC
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Reviewed in July 2015
<p>I contacted DH West Coast to have them replace some damaged sheetrock, in my basement Mediaroom, on July 14th. DH called back to make an appointment to see exactly what needed repaired, appointment was scheduled for Thursday morning. They showed up, on time and Darrel said if I wanted them to...
DH West Coast Construction LLC
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Reviewed in June 2015
<p>My basement is still leaking, I believe Cory fixed what he said he did, however there must be another problem why basement is still flooding. it only leaks during a very, very heavy rainfall. I may just hire someone to dig down and completely seal outside of wall so I will no longer have to...
Able Repair & Remodeling
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Reviewed in February 2014
Steven called and set up an appointment for the late afternoon. In mid afternoon he called to say his previous job was complete and asked if he could come by sooner. His original diagnoses of the problem was correct and he quickly made the repair. Having never had to use a plumber before I...
Burkes Plumbing
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Reviewed in October 2012
Our plumbing in the basement has had constant issues since moving in 7 years ago. After setting up an appointment, the technician arrived at the set time and began cleaning the drain. After doing the main drain clearing, the owner arrived and did a video inspection (an extra cost) of the line,...
Doug's Rooter Service
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Find Basement waterproofing pros in Union Gap

Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"I was please with the estimator, Boston's knowledge and willingness to walk me through the process and unfamiliar territory of basement waterproofing. He was very knowledgeable and answers so many questions, at the time of the walk through as well as in the days after when I had questions after receiving other bids and trying to compare them. In the end, it was just my low budget that kept me from going with Terra Firma. I thought their system was excellent, and would have worked well with my basement, but I had to opt for a less expensive design."

A System Design Specialist helping a homeowner

Fleet of vehicles in our Portland, Oregon locatio

Loading up a truck for a waterproofing job

+33

Response time10 mins

Response rate100%

120 neighbors recently requested a quote

Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"We’ve had a lot of crews in our home for various projects over the years, and I have to say this was one of the most courteous. They worked hard, navigating through our kitchen to access the basement and I really appreciated their efforts. Thank you MTU, we now have safe walls in our cellar and fresh beams to keep the house standing ;)"

Piers under an existing homes middle wall

Response time1 day

Response rate100%

5 neighbors recently requested a quote

Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved (Corporate)

In business since 1983

Free estimates

Credit card accepted

HEATING, COOLING, ELECTRICAL, SOLAR, PLUMBING, AND\nDRAIN SERVICES IN THE TRI-CITIES & YAKIMA, WA\nSpeedy Response - Expertise and Experience - Efficient Troubleshooting - Quality Workmanship - Transparent Pricing - Excellent Customer Service\n\nAre you facing an HVAC breakdown, a plumbing emergency, electrical issues, or considering a solar energy upgrade? Look no further! We are your trusted experts in HVAC, plumbing, electrical repairs, generator needs and solar energy solutions, and we're here to solve your problems swiftly and efficiently.

43 neighbors recently requested a quote

Recommended by88%of homeowners

Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 1997

Free estimates

Emergency services offered

Thank you for considering hiring us for your project! At Mr. Rooter Plumbing we pride ourselves on quality work, integrity and competitive pricing. We believe in giving our absolute best, no matter how big or small your project.\nWe are experts in our trade, and we will keep you educated and informed throughout the completion of your project. We treat your property like it's our own, with the utmost respect, just like we would our own family!\nAs the owner, my aim is to earn a 5-star review on the completion of your project. So, please let me know if at any time we are not living up to earning your perfect 5-star review.\nWe look forward to earning your business, so please ask us for references!

Response time8 hrs

Response rate100%

9 neighbors recently requested a quote

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Bedrock Excavation and General Contracting LLC

New to Angi

Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 2025

Free estimates

Small jobs welcome

Pride ourselves with quick quality work with honest prices

9 neighbors recently requested a quote

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TerraFirma Foundation Systems

4.4(

238

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 2005

Free estimates

Emergency services offered

"I used TerraFirma to install a sump pump in my leaking basement. The team that worked on installation were great to work with. I was very pleased with the quality of work, the communication throughout the process, and their respect for my home."

+11

Response time7 hrs

Response rate100%

Recommended by89%of homeowners

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State Wide Contracting

5.0(

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 2011

Free estimates

Emergency services offered

"Went great, Contractor found poor construction with existing windows and fixed the issue when installing new windows."

+25

Recommended by100%of homeowners

Basement Drainage Channels - Install

Serving Union Gap, WA and surrounding areas

In business since 2021

Free estimates

Emergency services offered

"Great to work with! Most importantly; on time and efficient. Highly recommend Jg construction!"

+44

Recommended by100%of homeowners

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Ybarra Professional Builders

4.3(

)

Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 1977

Free estimates

Credit card accepted

"They were in time and no cost over runs. Alfredo and Miguel were excellent"

Response time4 days

Recommended by83%of homeowners

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Hampton Enterprise LLC

3.7(

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"They did a very good job. They were quick and I am very happy with the work that they did for me."

Recommended by60%of homeowners

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Showing 1-10 of 23

Basement Waterproofing questions, answered by experts

Anything having to do with the structure of your home, such as raising the ceiling, is usually the most expensive part of finishing a basement. Another project component that could be a surprisingly high expense is adding an exterior entrance.

The cost of a walkout basement can be anywhere from $5,000 to $35,000.

Preventing water accumulation involves regular inspections, maintaining effective drainage systems, ensuring proper roof maintenance, and taking preventive measures against heavy rainfall or floods.

Plan on cleaning your crawl space at least once a year, though twice a year is ideal. During the cleaning, remove any debris or dust and check for potential issues like pest infestations or water damage. The sooner you catch these issues, the easier (and cheaper) it will be to fix them.

Yes, you can add a bathroom to an unfinished basement, but you’ll want to take proper precautions if doing so. As with any bathroom addition, you’ll need to make sure that it’s approved by local building authorities first. With unfinished basements, you especially need to keep an eye on proper ventilation practices.

Due to the nature of basements, some level of waterproofing is necessary to prevent water from seeping in and causing damage. Some definitive signs that your basement needs waterproofing measures or needs existing waterproofing measures need to be updated include:

Water in your basement, including damp walls or puddles on the floor
Mold spots in your basement
Musty smells or odors
Warped doors or walls
Cracks in walls
Insect issues, such as cockroaches and termites

The Union Gap, WA homeowners’ guide to basement waterproofing services

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

See all articles

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•
Jul 20, 2026Jul 20, 2026
How Much Does Basement Waterproofing Cost? [2026 Data]
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•
Jul 9, 2026Jul 9, 2026
How Much Does It Cost to Finish a Basement? [2026 Data]
An unfinished basement has a lot of potential for a family room or guest suite. So how much does it cost to finish a basement? Read on for all cost factors.
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•
Jul 10, 2026Jul 10, 2026
How Much Does Crawl Space Encapsulation Cost? [2026 Data]
A variety of factors can affect your total crawl space encapsulation cost. Here’s a breakdown of the cost of this project, whether you hire a pro or DIY.
D.P. Taylor
•
Jul 9, 2026Jul 9, 2026
How to Hire a Basement Waterproofing Contractor
Waterproofing your basement is important to protect your home. Follow these tips to ensure that you hire the right waterproofing contractor for the job.
Dan Simms
•
Jul 9, 2026Jul 9, 2026
What Is Basement Waterproofing and How Does It Work?
Struggling with a damp basement? Learn about basement waterproofing and how these tips can help keep your basement safe from the elements.
Dan Simms
•
Jul 8, 2026Jul 8, 2026
How to Waterproof a Basement Like a Pro
Dealing with a damp basement? Follow these steps for DIY basement waterproofing to keep water and moisture out and boost your home’s energy efficiency.