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Foundation, basement or crawlspace waterproofing / encapsulation pros in Seattle

Avatar for Insulation Co., LLC - Removal & Clean Outs
Insulation Co., LLC - Removal & Clean Outs
20508 Cypress Way
4.95(
130
)
Approved Pro
Insulation Co., LLC - Removal & Clean Outs
20508 Cypress Way
4.95(
130
)
Approved Pro
Super Service Award
Customers say: True professional
16 years of experience
Free onsite estimate

Insulation Co. LLC - your premier insulation partner since 2008, is right in the heart of Seattle and extends our services throughout Western Washington. As the regions trusted attic and crawl space specialists, we bring a wealth of experience and expertise to every project. We specialize in creating pristine, energy-efficient spaces and offer comprehensive attic and crawl space services. Our expert insulation removal and replacement services, along with thorough cleaning, ensure your home is always in top shape. We are skilled in removing and remediating molds and enhancing air quality with professional duct insulation and sealing. Our skilled team also provides rodent proofing ensuring your home remains a sanctuary free of unwanted guests. We upgrade your home's defenses with our robust crawl space doors, vapor barriers, and air-sealing techniques. For moisture issues, we offer sump pump and French drain solutions. For manufactured homes, we provide specialized crawl space services.

"We had Insulation Co remove and replace our blow-in attic insulation as a part of a larger electrical project. Both phases of the insulation work went quickly and smoothly. Better yet, Jo from the company was incredibly responsive and kind in his communications with us which is a big bonus for first-time homeowners still learning how a lot of this stuff works. Our family recommends Insulation Co should you need similar services."

Richard F on April 2025

Insulation Co. LLC - your premier insulation partner since 2008, is right in the heart of Seattle and extends our services throughout Western Washington. As the regions trusted attic and crawl space specialists, we bring a wealth of experience and expertise to every project. We specialize in creating pristine, energy-efficient spaces and offer comprehensive attic and crawl space services. Our expert insulation removal and replacement services, along with thorough cleaning, ensure your home is always in top shape. We are skilled in removing and remediating molds and enhancing air quality with professional duct insulation and sealing. Our skilled team also provides rodent proofing ensuring your home remains a sanctuary free of unwanted guests. We upgrade your home's defenses with our robust crawl space doors, vapor barriers, and air-sealing techniques. For moisture issues, we offer sump pump and French drain solutions. For manufactured homes, we provide specialized crawl space services.

"We had Insulation Co remove and replace our blow-in attic insulation as a part of a larger electrical project. Both phases of the insulation work went quickly and smoothly. Better yet, Jo from the company was incredibly responsive and kind in his communications with us which is a big bonus for first-time homeowners still learning how a lot of this stuff works. Our family recommends Insulation Co should you need similar services."

Richard F on April 2025


Avatar for P4 Construction, LLC
P4 Construction, LLC
19680 146th St SE
5.00(
2
)
Approved Pro
P4 Construction, LLC
19680 146th St SE
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 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 drainage services our job is to control and direct water away from your home or building.We have 13 years in the drainage field and specialize in,waterproofing foundation walls,basement drainage,yard drains,french drains,crawlspace interior drain systems,sump pump installations and replacement,new pvc downspout drain pipe installations,clean and or repair downspout pipes.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 work with the best materials out there.We take pride on what we do.Our hard work speaks for itself.We look forward on helping you with your drainage projects.

"We hired them to install a 40 foot french drain. Eric was very knowledgeable and professional, not to mention a very nice person and good listener. He was punctual and he and his crew were extemely hard workers. The job functions as promised, looks great and they were very conscientious about how they left the work area neat and clean. I wish I could hire them for other projects."

Bill G on June 2024

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 drainage services our job is to control and direct water away from your home or building.We have 13 years in the drainage field and specialize in,waterproofing foundation walls,basement drainage,yard drains,french drains,crawlspace interior drain systems,sump pump installations and replacement,new pvc downspout drain pipe installations,clean and or repair downspout pipes.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 work with the best materials out there.We take pride on what we do.Our hard work speaks for itself.We look forward on helping you with your drainage projects.

"We hired them to install a 40 foot french drain. Eric was very knowledgeable and professional, not to mention a very nice person and good listener. He was punctual and he and his crew were extemely hard workers. The job functions as promised, looks great and they were very conscientious about how they left the work area neat and clean. I wish I could hire them for other projects."

Bill G on June 2024


Avatar for Attic Doctor LLC
Attic Doctor LLC
10333 NE 1st St #154
5.00(
14
)
Approved Pro
Attic Doctor LLC
10333 NE 1st St #154
5.00(
14
)
Approved Pro
Super Service Award
Customers say: Quick response
109 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!

"Great job done"

Kyle R on January 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!

"Great job done"

Kyle R on January 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
30 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


Avatar for Groundworks
Groundworks
18915 16th Ave S
4.57(
76
)
Approved Pro
Groundworks
18915 16th Ave S
4.57(
76
)
Approved Pro
Super Service Award
Customers say: True professional
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
84 local quotes requested

Groundworks specializes in helping homeowners with their residential and commercial foundation repair, basement waterproofing and wall repair, and concrete repair needs. Our top priority is providing high-quality home repair solutions and personalized service across the Seattle area. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation.

"I just had the BEST experience with Groundworks, working with Brian Eames, and the crew of Alex, Iuri and Luis. My project was a big project consisting of installation of approximately 40 pier piles, pin piles and helical piles to my foundation, in order to better anchor my home to the bedrock (I live on a hill). I was EXTREMELY nervous about the project and planned for it for a year and a half. Brian consistently calmed my fears every step of the way, and each time I had a question, he took as much time as needed to give me all the answers and reassure me. When my project finally occurred last week, I was immediately comforted by the presence of the crew - Alex, Iuri and Luis. They were professional, respectful, kind, and explained everything in detail before they started on the project to alleviate any concerns I had. When the project was complete, the clean up was amazing, They put everything back together perfectly, and it was as if they had never been here. I now have t"

Ho G on April 2025

Groundworks specializes in helping homeowners with their residential and commercial foundation repair, basement waterproofing and wall repair, and concrete repair needs. Our top priority is providing high-quality home repair solutions and personalized service across the Seattle area. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation.

"I just had the BEST experience with Groundworks, working with Brian Eames, and the crew of Alex, Iuri and Luis. My project was a big project consisting of installation of approximately 40 pier piles, pin piles and helical piles to my foundation, in order to better anchor my home to the bedrock (I live on a hill). I was EXTREMELY nervous about the project and planned for it for a year and a half. Brian consistently calmed my fears every step of the way, and each time I had a question, he took as much time as needed to give me all the answers and reassure me. When my project finally occurred last week, I was immediately comforted by the presence of the crew - Alex, Iuri and Luis. They were professional, respectful, kind, and explained everything in detail before they started on the project to alleviate any concerns I had. When the project was complete, the clean up was amazing, They put everything back together perfectly, and it was as if they had never been here. I now have t"

Ho G on April 2025


Avatar for TerraFirma Foundation Systems
TerraFirma Foundation Systems
10111 South Tacoma Way Unit D5
4.50(
64
)
Approved Pro
TerraFirma Foundation Systems
10111 South Tacoma Way Unit D5
4.50(
64
)
Approved Pro
Customers say: Quick response
55 local quotes requested
20 years of experience

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.

"Was a great experience, professional and fast."

David F on April 2025

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.

"Was a great experience, professional and fast."

David F on April 2025


Avatar for ACS - Seattle, LLC
ACS - Seattle, LLC
4742 42nd Avenue Southwest, Suite 500
4.54(
40
)
Approved Pro
ACS - Seattle, LLC
4742 42nd Avenue Southwest, Suite 500
4.54(
40
)
Approved Pro
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
14 local quotes requested

"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

"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 Washington Foundation Solutions Inc
Washington Foundation Solutions Inc
1406 Ivy Rd
New on HomeAdvisorNew on Angi
Approved Pro
Washington Foundation Solutions Inc
1406 Ivy Rd
New on AngiNew on HomeAdvisor
Approved Pro
7 years of experience
Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!


Avatar for King County Roofing & Exteriors, LLC
King County Roofing & Exteriors, LLC
8201 164th Ave NE Ste 200
5.00(
1
)
Approved Pro
King County Roofing & Exteriors, LLC
8201 164th Ave NE Ste 200
5.00(
1
)
Approved Pro
Free onsite estimate

With over 20 years 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.

" Cracks in our foundation had us worried, but the team did a flawless repair job. Feels like new again."

David J on April 2025

With over 20 years 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.

" Cracks in our foundation had us worried, but the team did a flawless repair job. Feels like new again."

David J on April 2025


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
47 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

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Foundation, basement or crawlspace waterproofing / encapsulations FAQs

Yes, crawl space encapsulation is a good investment. It improves your home's energy efficiency and air quality, boosting its value. With routine inspections and maintenance, encapsulation provides a long-lasting solution to moisture and pest issues. Regular check-ups protect your investment, enhance energy efficiency, and maintain your home's structural integrity. If your home is prone to pests or moisture seepage, encapsulating your crawl space is definitely worth it.

A vapor barrier is a thin sheet of plastic that prevents moisture from seeping into your crawl space, while insulation prevents unconditioned air from entering. Combining both insulation and a vapor barrier creates a dry, temperature-stable environment. Some insulation products serve both purposes, enhancing energy efficiency and protecting against moisture and temperature fluctuations.

The homeowners guide to foundation, basement or crawlspace waterproofing / encapsulations
From average costs to expert advice, get all the answers you need to get your job done.
Empty basement with new concrete floor and white walls
Apr 21, 2025
Apr 21, 2025
If you’re planning to install a new foundation, check out budgeting and cost factors to consider.
raising the foundation of a home with a house lift
Apr 21, 2025
Apr 21, 2025
Learn how much it costs to raise a house. Explore how factors like the house size, structure, age, landscaping, and labor rates affect the price.
A man digging out a french drain
Mar 31, 2025
Mar 31, 2025
Budget for French drain costs based on factors including square footage, accessibility, labor, location, landscape repairs, and more.
crawl space prepared for an encapsultion
Mar 20, 2025
Mar 20, 2025
Use this guide to budget for crawl space encapsulation cost factors such as crawl space size, prep, maintenance tasks, labor, and more.
Basement of house sealed against water damage
Feb 13, 2025
Feb 13, 2025
If you need to waterproof your basement, consider essential cost factors, including basement size, sealant type, home age, and more.
drainage system being installed in trench in yard
Nov 26, 2024
Nov 26, 2024
Explore costs for French drains, catch basins, storm sewers, and trench drains with our yard drainage system installation cost guide.
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