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Best basement waterproofing pros near Seattle, WA

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TRUSTED BY SEATTLE, WA HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon103
    Verified basement waterproofing services reviews

Top-Rated Basement waterproofing pros in Seattle - Updated Nov 2026

Avatar for Insulation Co., LLC - Removal & Clean Outs
Insulation Co., LLC - Removal & Clean Outs
4.9(
226
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Seattle, WA and surrounding areas

Approved

In business since 2009

Free estimates

Warranties offered

"I contacted a few companies for quotes and Insulation Co was local to Edmonds, so I engaged them. Jo provided a fast quote over email, which I found odd as the other guys made an effort to come out and view the job and obviously high pressure sell you.... The quote was inline and lower than other guys, so based on that and the great reviews they had, I went with it. Other companies had as many 1 star reviews as 5 star and that was a deal breaker. Jo has almost all 5 Star reviews...The team was able to schedule a time within a week and did all the work while we were out of town. I'm very happy with the results. Did a crawl space insulation, vapor barrier, all the AC duct work and even the adjoining wall to the basement, which I didn't expect. Were in and out in half a day, all cleaned up and professional. House floors are noticeably warmer. Highly recommend this local small business."
1
2
3
1
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+46

Response time5 hrs
Recommended by49%of homeowners
Avatar for Puget Sound Builders & Renovation
Puget Sound Builders & Renovation
5.0(
1,372
)
Basement Drainage Channels - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 2006

Credit card accepted

Customers say: True professional

"We hired Puget Sound B&R for basement remodeling and Dan did a fantastic job managing the project. The crew was hardworking, respectful, and detail-oriented. Our basement now feels like a completely new living space. Great experience from start to finish with outstanding workmanship."
Bathroom Renovation
Basement Remodel
Bathroom Renovation
Basement Remodel
Kitchen Remodeling

+23

10 neighbors recently requested a quote
Near Me Roofing Company
5.0(
74
)
Basement Drainage Channels - Repair

Serving Seattle, WA and surrounding areas

Approved

In business since 2012

Free estimates

Credit card accepted

"Excellent service and very thorough with explanation and getting the right. I researched many skylight installation companies and decided to hire Ari and Elijah. I will recommend my colleagues and friends and family. I will absolutely use this roofing company for any roof work on my house."
Response time4 days
Recommended by80%of homeowners
Avatar for Wu Construction
Wu Construction
4.6(
238
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Seattle, WA and surrounding areas

Approved

In business since 1983

Free estimates

Emergency services offered

"Better than I could have asked for. They came up with a GREAT solution to my basement leaking issues (I had a river in my basement last winter) thus far this fall not a drop. His option was faster, cheaper and more effective than the other 3 companies i had bid the job. I could not be happier!"
Additional Photos
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Additional Photos

+11

Response time10 mins
Response rate100%
25 neighbors recently requested a quote
Avatar for MTU Services LLC
MTU Services LLC
5.0(
5
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Seattle, 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 ;)"
Elevator pit waterproofing and sealing
Piers under an existing home
Piers under an existing homes middle wall
Solutions/Answers
Response time1 day
Response rate100%
4 neighbors recently requested a quote
Avatar for Iconiq Construction, LLC
Iconiq Construction, LLC
4.9(
32
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Seattle, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Warranties offered

"Iconiq Construction Service did an amazing job finishing our basement. The team was professional, efficient, and detail-oriented. The results were outstanding, creating a functional and beautiful space. Highly recommend their services!"
kitchen remodel
Kitchen remodel
addition project
bathroom remodel
bathroom remodel

+2

Response time1 day
Response rate94%
9 neighbors recently requested a quote
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Basement Waterproofing FAQs, answered by experts

In Seattle, interior basement waterproofing projects typically take between three and ten days, depending on the size and condition of the basement. Exterior waterproofing, especially full-perimeter drainage or foundation sealing, can extend from one to six weeks. Rainy weather may cause additional delays, particularly in spring and fall. Factoring in planning, contractor scheduling, and permit approval, the entire process often spans two to four months from start to finish.

Helpful?

Seattle offers a range of basement waterproofing professionals, including specialists focused on interior moisture control, exterior foundation sealing, and drainage system installation. Some contractors are experts in structural repairs for older Seattle homes, while others provide mold remediation or crawl space encapsulation. Consulting with a local structural engineer can help assess complex issues. Always verify contractors’ experience with Seattle’s unique soil and rainfall patterns to ensure effective, long-lasting solutions.

Helpful?

In Seattle, basement waterproofing projects benefit from materials designed for persistent rain and clay-heavy soils. For interior waterproofing, use high-grade epoxy injections for crack repair, vapor barriers with superior moisture control ratings, and dehumidifiers built for the Pacific Northwest climate. Exterior solutions should include elastomeric membranes, drainage boards, and bentonite clay panels, which perform well in local soil. Installing perimeter French drains and reliable sump pumps further protects against Seattle’s frequent groundwater intrusion.

Helpful?

Basement waterproofing in Seattle delivers immediate benefits like reduced humidity, improved air quality, and prevention of mold growth. Over the long term, it safeguards your home’s foundation from water damage, preserves property value, and enhances energy efficiency during damp winters. Waterproofing also helps prevent structural shifting common in Seattle’s soil, making your basement a healthier, more usable space while reducing the risk of costly repairs in the future.

Helpful?

Before starting basement waterproofing in Seattle, confirm if your project requires permits, especially for exterior excavation or drainage work. Schedule waterproofing during the drier summer months to minimize weather-related delays. Arrange for a soil analysis to determine drainage needs specific to your property. Notify neighbors if excavation may affect shared boundaries, and request detailed project timelines and references from local contractors experienced with Seattle’s rainfall and soil conditions.

Helpful?

The Seattle, WA homeowners’ guide to basement waterproofing services

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