Get matched with top basement waterproofing pros in Sequim, WA

Square 1 Venture Group, LLC

4.97(

Recommended by 100% of Angi customers

12 years of experience

It doesn't have to be hard to maintain your property. You can turn to Square 1 Venture Group LLC for top-notch Crawl Space services or painting services. We'll take the time to understand your unique needs, then complete your job with expert skill and efficiency. Rely on us to update your residential l property in the Sequim, Port Townsend, Port Angeles areas. Clean outs, Insulation, French Drains, Structural Repairs, Foundation Repairs and more, I have over 35 years in the industry!

"I rate the job of cleaning our power washing our exterior house (great care to not damage the older painting, but cleaned the grime and dirt), and our walkways and driveways. Jon is a lovely man who was very prompt, estimate the time for the job perfectly, and left our old home and exterior in much better than I thought it might look. Don't have any hesitant to hire this company. The charge for the job was very reasonable. Thank you Jon, and I hope to see you again."

Dottie F on June 2023

"I rate the job of cleaning our power washing our exterior house (great care to not damage the older painting, but cleaned the grime and dirt), and our walkways and driveways. Jon is a lovely man who was very prompt, estimate the time for the job perfectly, and left our old home and exterior in much better than I thought it might look. Don't have any hesitant to hire this company. The charge for the job was very reasonable. Thank you Jon, and I hope to see you again."

Dottie F on June 2023

Rain Pros Inc

Rain Pros Inc

Customers say: Super punctual

Recommended by 94% of Angi customers

20 years of experience

Rain Pros is Puget Sounds premier full-service drainage company, with a reputation of unmatched customer service and exceptional quality. Our professionals have years of experience in drainage installation, repair and maintenance. We are very proud to be growing company and leader in each of our fields. For bid requests regarding the installation of a new drainage system please email our general manager ([email protected]). For drainage repair and inspection requests please contact our service coordinator at (253) 678-7111, additionally you can email- [email protected] to immediately cue for with our service department.

"Joel (salesman), Pepe and Lucio (foremen) did a GREAT job, start to finish. Every last laborer demonstrated a positive attitude along with a top-notch work ethic. And when the project was completed, one could NOT even see where any of the digging took place. Of a certainty, Rain Pros has got MY vote!"

Michael W on January 2026

"Joel (salesman), Pepe and Lucio (foremen) did a GREAT job, start to finish. Every last laborer demonstrated a positive attitude along with a top-notch work ethic. And when the project was completed, one could NOT even see where any of the digging took place. Of a certainty, Rain Pros has got MY vote!"

Michael W on January 2026

Groundworks

Groundworks

29 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

"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

4.62(

Groundworks

4.62(

Customers say: True professional

31 years of experience

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.

"We cannot say enough good things about the help and care Ernest Vigil gave us from the start of our crawl space project to the end. He returned our calls and emails promptly and helped guide us each step of the way. He went above and beyond when a problem arouse to find local help to quickly come out to help address and fix the problem. Mathew from Puget Sound Water Rescue one of the local company is a good company to have on call. And your team members from Georgia were outstanding. We have several neighbors who have watched the care and quality we received with ground works and have said they will be the first company they will call when they are ready to have work done on their homes. Thank you, Ernest and the rest of your team for treating us like you would a member of your own family. It has been a pleasure working with you. Cindy and Alan D."

Cindy D on January 2026

"We cannot say enough good things about the help and care Ernest Vigil gave us from the start of our crawl space project to the end. He returned our calls and emails promptly and helped guide us each step of the way. He went above and beyond when a problem arouse to find local help to quickly come out to help address and fix the problem. Mathew from Puget Sound Water Rescue one of the local company is a good company to have on call. And your team members from Georgia were outstanding. We have several neighbors who have watched the care and quality we received with ground works and have said they will be the first company they will call when they are ready to have work done on their homes. Thank you, Ernest and the rest of your team for treating us like you would a member of your own family. It has been a pleasure working with you. Cindy and Alan D."

Cindy D on January 2026

TerraFirma Foundation Systems

TerraFirma Foundation Systems

21 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.

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

Andrew M on February 2020

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

Andrew M on February 2020

TerraFirma Foundation Systems

4.51(

TerraFirma Foundation Systems

4.51(

21 years of experience

"Had a sump pump installed. Haven’t had a repeat of the problem."

Edward H on December 2025

"Had a sump pump installed. Haven’t had a repeat of the problem."

Edward H on December 2025

Groundworks

Groundworks

26 years of experience

Based in Phoenix, AZ, we specialize in foundation repair, basement waterproofing, concrete leveling, and crawl space repair. Serving Arizona, we deliver reliable solutions for businesses and commercial properties. Contact us today!

"Gauge is a Representative who puts his Clients first. He reminds me, of a younger me. (This says a lot, because I was always a top notch Sales Rep and I retired early, as a result of my personal efforts and how I always did, as I said, and placed my Clients as top priority). I have yet to begin my project, but he won over my business and I?m excited to see the results. I?m confident they will exceed my expectations."

Martin &amp;amp;amp;quot;Rocky&amp;amp;amp;quot; B on January 2026

"Gauge is a Representative who puts his Clients first. He reminds me, of a younger me. (This says a lot, because I was always a top notch Sales Rep and I retired early, as a result of my personal efforts and how I always did, as I said, and placed my Clients as top priority). I have yet to begin my project, but he won over my business and I?m excited to see the results. I?m confident they will exceed my expectations."

Martin &amp;amp;amp;quot;Rocky&amp;amp;amp;quot; B on January 2026

BUILDING PERFORMANCE PROS LLC

BUILDING PERFORMANCE PROS LLC

1 years of experience

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!

"The workers were on time. Very efficient. They did a blower door test and found the air leaks and insulated these areas. Blew installation above the garage, cleaned out the crawl space and put new installation there and basement. Found a water leak from my toilet,Thank goodness. Covered everything in the basement and swept and cleaned up after. I would recommend them!"

Nancy W on October 2025

"The workers were on time. Very efficient. They did a blower door test and found the air leaks and insulated these areas. Blew installation above the garage, cleaned out the crawl space and put new installation there and basement. Found a water leak from my toilet,Thank goodness. Covered everything in the basement and swept and cleaned up after. I would recommend them!"

Nancy W on October 2025

WESTERN CONSTRUCTION SYSTEMS

4.85(

WESTERN CONSTRUCTION SYSTEMS

4.85(

Customers say: Quality work

Recommended by 92% of Angi customers

Not a franchise, Family owned and operated since 1987. CCB# 94222, Serving the entire NW. FREE Estimates/ Inspections. Western Construction Systems LLC. is a locally owned, family owned and operated specialty construction company serving the entire north-west. WCS LLC. Prides its self in high quality work which is micro-managed by highly trained crews to ensure the highest level of confidant work. WCS LLC. Has also worked internationally in South America and currently has crews in Haiti. We have worked as far south as El Salvador and as far north as Alaska. We are able to attend to small residential job as well as large industrial projects.

"Western Construction Systems came out and did exceptional work at my house! They went above and beyond my expectations! They were friendly, professional, and hard-working! They took care of all the issues that I had concerns with and then some! Their prices were fair, especially for the high quality of work that they did! I know I pestered them with questions, but they were patient every single time. Before I contacted them to have the work done, I had high anxiety about the drainage issues. When they were finished, I felt confident that there were no more issues. Peace of mind is priceless!"

Robyn S on August 2022

"Western Construction Systems came out and did exceptional work at my house! They went above and beyond my expectations! They were friendly, professional, and hard-working! They took care of all the issues that I had concerns with and then some! Their prices were fair, especially for the high quality of work that they did! I know I pestered them with questions, but they were patient every single time. Before I contacted them to have the work done, I had high anxiety about the drainage issues. When they were finished, I felt confident that there were no more issues. Peace of mind is priceless!"

Robyn S on August 2022

Kattau Construction

Kattau Construction