Top-rated basement waterproofing pros.

Get matched with top basement waterproofing pros in Seattle, WA

There are 24 highly-rated local basement waterproofing pros.

Need a pro for your basement waterproofing project in Seattle, WA?

Select your specific project to find the pro for you.

TRUSTED BY SEATTLE, WA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon112
    Verified basement waterproofing services reviews

Find Basement waterproofing pros in Seattle

Avatar for TerraFirma Foundation Systems

TerraFirma Foundation Systems

932 Industry Dr
5.00(
8
)
Approved Pro

TerraFirma Foundation Systems

932 Industry Dr
5.00(
8
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
89 local quotes requested

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Great; competitive price, installation went great, friendly and responsive staff in person and office"

Andrew M on February 2020

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Great; competitive price, installation went great, friendly and responsive staff in person and office"

Andrew M on February 2020


Avatar for Groundworks

Groundworks

18915 16th Ave S
4.44(
162
)
Approved Pro

Groundworks

18915 16th Ave S
4.44(
162
)
Approved Pro
Customers say: Super punctual
30 local quotes requested
28 years of experience

Groundworks, formerly, Matvey Foundation Repair is the leading structural and concrete repair firm in Western Washington. We specialize in repairing residential and commercial foundations, concrete slabs, bowing/cracked basement walls, sinking floors, concrete porches, settling/cracked foundations, and other structural issues. We raise and level concrete pavements, driveways, and sidewalks. We also offer basement waterproofing. Our expert design technicians provide professional services for commercial, residential, industrial, government, and municipal applications with award-winning products and superior customer service. CALL US TODAY FOR A FREE ESTIMATE! GROUN**76305

"Very informative. Clear and concise. Gave us many options. Daniel is a wonderful and honest person and was so helpful with our questions. The crew lead by Anthony, with Jordan, Uriel, and Richard did professional work. The finished product is wonderful and can already feel the results in the house. Would 1000% recommend. Just keep in mind it is a very messy job. These guys do the best they can to keep it clean"

Charles W on May 2025

Groundworks, formerly, Matvey Foundation Repair is the leading structural and concrete repair firm in Western Washington. We specialize in repairing residential and commercial foundations, concrete slabs, bowing/cracked basement walls, sinking floors, concrete porches, settling/cracked foundations, and other structural issues. We raise and level concrete pavements, driveways, and sidewalks. We also offer basement waterproofing. Our expert design technicians provide professional services for commercial, residential, industrial, government, and municipal applications with award-winning products and superior customer service. CALL US TODAY FOR A FREE ESTIMATE! GROUN**76305

"Very informative. Clear and concise. Gave us many options. Daniel is a wonderful and honest person and was so helpful with our questions. The crew lead by Anthony, with Jordan, Uriel, and Richard did professional work. The finished product is wonderful and can already feel the results in the house. Would 1000% recommend. Just keep in mind it is a very messy job. These guys do the best they can to keep it clean"

Charles W on May 2025


Avatar for Sump Pump Wizards LLC

Sump Pump Wizards LLC

707 Vine Ct
New on AngiNew on Angi
Approved Pro

Sump Pump Wizards LLC

707 Vine Ct
New on AngiNew on Angi
Approved Pro
1 years of experience
Free onsite estimate

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.


Avatar for Iconiq Construction, LLC

Iconiq Construction, LLC

1601 5th Avenue, Unit 9
5.00(
18
)
Approved Pro

Iconiq Construction, LLC

1601 5th Avenue, Unit 9
5.00(
18
)
Approved Pro
Customers say: Quick response
35 local quotes requested
2 years of experience

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

"I am extremely satisfied with the work completed by Iconiq Construction. Their craftsmanship, communication, and efficiency were impressive. The project turned out even better than I had imagined. Highly recommend their service to everyone."

Michael K on August 2025

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

"I am extremely satisfied with the work completed by Iconiq Construction. Their craftsmanship, communication, and efficiency were impressive. The project turned out even better than I had imagined. Highly recommend their service to everyone."

Michael K on August 2025


Avatar for Modern Painting Group

Modern Painting Group

9721 227th Pl Sw
4.89(
9
)
Approved Pro

Modern Painting Group

9721 227th Pl Sw
4.89(
9
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
15 local quotes requested

Modern Painting Group is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"We consulted with three different companies. We selected Edmond's bid (although it was not the least expensive) because we were impressed with the level of care and preparation he described. Besides the normal pressure washing, his team scraped peeling paint from our garage doors and even replaced the rotting wood under one of our bow windows before thoroughly prepping all the rest of the house, including caulking cracks that had developed in the foundation and sealing gaps between the new roof and our siding. He carefully matched the colors we wanted. His team was thorough and professional; they took pride in showing us the detailed work they were doing. Edmond conducted a thorough inspection after the job was completed, guaranteed the work, and only then accepted payment. Highly recommended."

Christe M on July 2024

Modern Painting Group is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"We consulted with three different companies. We selected Edmond's bid (although it was not the least expensive) because we were impressed with the level of care and preparation he described. Besides the normal pressure washing, his team scraped peeling paint from our garage doors and even replaced the rotting wood under one of our bow windows before thoroughly prepping all the rest of the house, including caulking cracks that had developed in the foundation and sealing gaps between the new roof and our siding. He carefully matched the colors we wanted. His team was thorough and professional; they took pride in showing us the detailed work they were doing. Edmond conducted a thorough inspection after the job was completed, guaranteed the work, and only then accepted payment. Highly recommended."

Christe M on July 2024


Avatar for Envirosmart Solution Inc

Envirosmart Solution Inc

330 SW 43rd Street Suite K267
5.00(
1
)
Approved Pro

Envirosmart Solution Inc

330 SW 43rd Street Suite K267
5.00(
1
)
Approved Pro
19 local quotes requested
21 years of experience

We are a local family-owned business that opened its doors in 2004 with our main goal of providing the best customer experience that we can to every single customer from the smallest to the biggest projects and maintain a long term relationship. We are ONE-STOP-SHOP for ALL Energy Efficiency needs. We are located in Renton, WA and gladly serving over 25 cities in the Washington Puget sound area. Our affordable, licensed, insured, and trained workers are here to help make your home safe, energy-efficient and comfortable. We can do: Energy efficiency upgrades and planning, Attic & Crawl space clean up and decontamination, Attic & Crawl space insulation installation. Vapor & Radiant barriers installation. Air Ducts & Dryer vent cleaning & replacement. HVAC, Ventilation installation and repair. Solar fans. HVAC Lighting installation, Generators, Surge protectors.

We are a local family-owned business that opened its doors in 2004 with our main goal of providing the best customer experience that we can to every single customer from the smallest to the biggest projects and maintain a long term relationship. We are ONE-STOP-SHOP for ALL Energy Efficiency needs. We are located in Renton, WA and gladly serving over 25 cities in the Washington Puget sound area. Our affordable, licensed, insured, and trained workers are here to help make your home safe, energy-efficient and comfortable. We can do: Energy efficiency upgrades and planning, Attic & Crawl space clean up and decontamination, Attic & Crawl space insulation installation. Vapor & Radiant barriers installation. Air Ducts & Dryer vent cleaning & replacement. HVAC, Ventilation installation and repair. Solar fans. HVAC Lighting installation, Generators, Surge protectors.


Avatar for Attic Doctor LLC

Attic Doctor LLC

10333 NE 1st St #154
5.00(
15
)
Approved Pro

Attic Doctor LLC

10333 NE 1st St #154
5.00(
15
)
Approved Pro
Super Service Award
Customers say: Quick response
147 local quotes requested
2 years of experience

Welcome to your one-stop shop for insulation, rodents and mold! Attic Doctor is a local, licensed contractor providing eco-friendly solutions to all of your attic and crawl space problems. Scratching sounds coming from the attic, when you’re trying to sleep? Mold destroying your roof and air quality? Losing your mind over heating and cooling costs? Call the Attic Doctor!

"Rodent exclusion work - they keep coming back until it’s done! No other rodent exclusion outfits I had out offered any kind of guarantee. After 6 months I needed them again and they were here in a flash! Amazing customer service. "

Anja C on July 2025

Welcome to your one-stop shop for insulation, rodents and mold! Attic Doctor is a local, licensed contractor providing eco-friendly solutions to all of your attic and crawl space problems. Scratching sounds coming from the attic, when you’re trying to sleep? Mold destroying your roof and air quality? Losing your mind over heating and cooling costs? Call the Attic Doctor!

"Rodent exclusion work - they keep coming back until it’s done! No other rodent exclusion outfits I had out offered any kind of guarantee. After 6 months I needed them again and they were here in a flash! Amazing customer service. "

Anja C on July 2025


Avatar for John's Waterproofing Co.

John's Waterproofing Co.

219 Airport Road
4.86(
51
)
Approved Pro

John's Waterproofing Co.

219 Airport Road
4.86(
51
)
Approved Pro
Customers say: Quick response
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
34 local quotes requested

John's Waterproofing Co. is the premier waterproofing company serving in Oregon and Washington for over 50 years. We Specialize in Basement and Crawlspace Waterproofing and Repairs, we offer free inspections and estimates along with caring customer service. Contact our office today for your waterproofing needs!

"John’s was quick to respond and were able to get us on the schedule quickly. They communicated effectively and did quality work. I will work with John’s again."

Matt H on October 2022

John's Waterproofing Co. is the premier waterproofing company serving in Oregon and Washington for over 50 years. We Specialize in Basement and Crawlspace Waterproofing and Repairs, we offer free inspections and estimates along with caring customer service. Contact our office today for your waterproofing needs!

"John’s was quick to respond and were able to get us on the schedule quickly. They communicated effectively and did quality work. I will work with John’s again."

Matt H on October 2022


"Overall a good experience. We hired ACS to take down and rebuild a brick pillar supporting our front porch. Gary's crew was excellent. Although they only spoke Spanish they were helpful and did a good job communicating as much as they could about what they were doing and/or had done. We're very happy with the end product. Gary stayed true to his quote and the contract price. The project was more involved than I expected, but they came through and completed it on budget. My only complaint is that Gary was hard to get a hold of at times."

Stephanie S on August 2021

"Focused on your Satisfaction"-For over 21 years, Communication and Professionalism have been our top priorities. Consistently working hard to make your remodeling project a pleasant experience.

"Overall a good experience. We hired ACS to take down and rebuild a brick pillar supporting our front porch. Gary's crew was excellent. Although they only spoke Spanish they were helpful and did a good job communicating as much as they could about what they were doing and/or had done. We're very happy with the end product. Gary stayed true to his quote and the contract price. The project was more involved than I expected, but they came through and completed it on budget. My only complaint is that Gary was hard to get a hold of at times."

Stephanie S on August 2021


Avatar for Iron Earth Construction LLC

Iron Earth Construction LLC

115 West Hill Street
5.00(
3
)
Approved Pro

Iron Earth Construction LLC

115 West Hill Street
5.00(
3
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
32 local quotes requested

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our

"Very accommodating and great service and product"

Sally K on September 2023

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our

"Very accommodating and great service and product"

Sally K on September 2023

...
Showing 1-10 of 208
Basement Waterproofing questions, answered by experts

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?

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?

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?

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?

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.