Basement Waterproofing

Water damage and moisture issues in your basement can lead to significant harm to your home, making basement waterproofing a critical investment.

Schedule Your Free Inspection and Quote

Seattle Basement Waterproofing Services

Basement waterproofing is essential for protecting your home from water intrusion, mold growth, and hydrostatic pressure, especially in the wet climate of Seattle, Redmond, Bellevue, Kirkland, Sammamish, and the Greater Eastside. Our team uses the proprietary Extreme Water Abandonment (EWA) System, a permanent interior waterproofing solution designed to capture and redirect water before it reaches your basement floor or walls. This system provides guaranteed, lifelong protection for your foundation while creating a cleaner, drier, healthier living space.


Schedule Your Free Inspection and Quote

Understanding Basement Waterproofing


Basement water intrusion is one of the leading causes of structural damage, mold growth, and poor indoor air quality, especially in moisture-heavy areas like Seattle, Redmond, Bellevue, Kirkland, and the Eastside. Effective basement waterproofing protects your home by addressing the root causes of moisture, including hydrostatic pressure, foundation cracks, failed footing drains, and poor exterior drainage. The process often includes installing interior drainage systems, sealing cracks, redirecting groundwater, and applying moisture barriers to keep your basement permanently dry. By waterproofing your basement, you prevent costly repairs, stop mold before it spreads, improve your home’s air quality, and increase long-term property value. At Wet Basement Services, our specialists deliver proven, permanent waterproofing solutions using our proprietary Extreme Water Abandonment (EWA) System, engineered to keep your basement dry for life.

Signs You Have Water In Your Basement


Here are some indicators that you may need basement waterproofing. If you haven’t noticed these issues yet, take the time to check for them. The sooner you identify basement problems, the better!

a woman smellling a musty basement in seattle

A musty odor in your basement is a strong indication of dampness, mold, and mildew accumulation.

Wet Basement Carpet Seattle

If your basement carpet is damp without any obvious source, it’s crucial to investigate the cause immediately.

Wet Basement Drywall

Flooding and moisture can cause the drywall in your basement to become wet, leading to potential mold growth and other issues.

Basement Condensation Issues

Condensation in your basement is a problem that needs prompt attention. What should you know about basement condensation?


Do you see any of these basement water intrusion signs? Schedule a free inspection and quote now.


Main Causes of Water Intrusion In Your Basement


Clogged Footing Drains


Clogged footing drains can lead to basement water leaks. These drains are designed to channel water away from your basement, but if they become blocked, water can accumulate inside. If you notice water pooling in your basement, it may be due to clogged drains.

Heavy Rain


During heavy rain and severe weather, your home's drainage system may struggle to handle excess water. To prevent basement flooding during these events, consider investing in improved waterproofing solutions.

Soil Settling


Water intrusion issues can also occur due to soil settling. When the soil beneath your basement shifts, it can create an uneven foundation, compromising your waterproofing. In such cases, you may need to explore new waterproofing methods.

Hydrostatic Pressure


If you’re experiencing pressure on your basement walls and floor, it may be a result of excess water in the surrounding soil. This hydrostatic pressure can cause basement walls to bow inward, leading to water leaks. To prevent these issues, it's crucial to address hydrostatic pressure in your basement.

Basement Waterproofing Solutions


Basement Sump Pump


A sump pump is one of the most important components of a basement waterproofing system. It removes standing water before it reaches your floors or walls and helps prevent flooding during heavy rain or rising groundwater. For homes in Seattle, Redmond, Bellevue, and surrounding areas, a properly installed sump pump provides essential protection against recurring moisture and long-term water damage. If you are planning any type of basement waterproofing, a sump pump should be included in the overall solution.


Sump Pump and Back Up Sump Pump Installation

Interior French Drain


If water collects around the edges of your basement or you notice damp spots along the perimeter, an interior French drain may be needed. This system creates a hidden drainage channel along the inside foundation wall that redirects water into the sump pump basin for safe removal. Adding a professionally installed interior drain helps keep your basement dry, prevents mold, and relieves hydrostatic pressure beneath the slab.


Interior French Drain Installation

Exterior French Drain


When water pools around the outside of your foundation or the soil becomes saturated, an exterior French drain can help move groundwater away from your home. This system is placed around the outside perimeter and captures water before it reaches your foundation walls. Including an exterior drain as part of your waterproofing strategy provides an extra layer of protection against basement leaks and moisture intrusion.


french drain installed at a seattle home

Before and After Images

before and after image

Waterproofing a 115 year old basement in Seattle, WA


We specialize in professionally addressing water leaks in Seattle's historic homes featuring concrete, stone, brick, and cinder block walls. Rely on us to resolve your water intrusion problems, backed by a lifetime transferable warranty, regardless of your property's age.

Read More... (link)

Client Experiences


My family hired Wet Basement Services last year when our basement flooded after a particularly heavy rain storm. After calling numerous companies (all of who were booked out for weeks) I was so lucky to find Wet Basement Services.  Jean D.

Explore Client Experiences

Owners and employees of Wet Basement Services

Achieve Permanent Basement Waterproofing with Expert Assistance


Short-term or low-quality waterproofing solutions won't suffice for your basement. It's essential to implement a comprehensive waterproofing strategy that ensures long-lasting protection. For effective long-term waterproofing, you need high-quality solutions from a Wet Basement Services waterproofing expert.



Flooded basement? These are your guys! With the record setting rain in Seattle in the last year, we unfortunately experienced a bunch of flooding in our finished basement and were left very unsure of how to manage; we reached out to several "waterproofing" companies and we received various responses from plumbers, foundation contractors and so-called "water cleanup experts...
Kim R.


My family hired Wet Basement Services last year when our basement flooded after a particularly heavy rain storm. After calling numerous companies (all of who were booked out for weeks) I was so lucky to find Wet Basement Services. They were busy as well, but they were able to come out after a couple of weeks. John quickly identified the issue and recommended the best system for us that also...
Jean D.


We don’t always do a great job letting people know when something is working well…unfortunately, we always let them know when it’s not.

So, we wanted to reach out to let you know that ALL your systems installed in June of 2022 at our home in Wallingford are functioning well under pressure…literally 😉 We’ve heard, but are not overwhelmed by the sound, of both submerged pumps...

Catherine H.


We had WBS come out in early 2022 to install a sump pump and drain tiles in our basement during a house remodel. They were quick and accommodating to our needs and explained everything to us as they worked. Our house is on a high water table (which we did not know when installing the pump), so during heavy rainfall in December of 2023 we noticed the concrete where the tiles were...
Brent T.


I couldn't be happier with the exceptional service and outstanding results I received from Wet Basement Services. I am a first time home buyer and got myself in a pickle where I purchased a very old house that had a previous water leaking issues in the basement. As someone who had very little knowledge on homes and understanding this was a huge issue, I received estimates from around 10 different vendors...
Kenneth B.


Had a great experience with these guys; they were up front about our various options, how disruptive they were, and the total cost. I felt like I had all the information I needed to make a good, informed decision. The actual work was done exactly on schedule and for a very reasonable price. Very happy with everything: ease of getting a quote, options offered, speed and quality of work just all around a great experience...
Michael W.


I highly recommend this group. They took care of water intrusion in our basement. They took the time to studied the problem, and in our case went the extra effort to figure out how to problem solve because we had a challenging set up with floor radiant heating.

They also gave me a competitive bid. Make sure you ask them to quote for the backup battery for the pump, which I recommend.

Mario G.


Having my basement fixed by Jersey and John was one of the best decisions I’ve made since becoming a homeowner. Every time it rains, I’m so relieved we don’t have to worry about the basement retaining water.

Jersey was so quick with his estimate, and John and his team were thorough, reassuring and easy to communicate with throughout the process. I’m so grateful for the...

Brittany C.