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Best basement waterproofing pros near Rainier, WA

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TRUSTED BY RAINIER, WA HOMEOWNERS

  • Average homeowner rating star icon3.9
    Average homeowner rating
  • Verified reviews icon14
    Verified basement waterproofing services reviews

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

Avatar for TerraFirma
TerraFirma
4.0(
100
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - RepairBasement Drainage Channels - Install

Serving Rainier, WA and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"Had huge foundation problems at a project of mine on the waterfront. We used terrafirma to both waterproof the entire basement AND lift the foundation. 10/10 would recommend. extremely communicative, very knowledgeable, and even brought a crew in from Oregon to help us stay on schedule. Oscar and jorge got the job done extremely quickly and Seth was fantastic as my project manager."
A System Design Specialist helping a homeowner
Encapsulating a crawl space
Fleet of vehicles in our Portland, Oregon locatio
Loading up our truck for a piering job
Loading up a truck for a waterproofing job

+33

Response time2 hrs
Response rate100%
89 neighbors recently requested a quote
Near Me Roofing Company
5.0(
74
)
Basement Drainage Channels - Repair

Serving Rainier, 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 Groundworks
Groundworks
4.3(
314
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - RepairBasement Drainage Channels - Install

Serving Rainier, WA and surrounding areas

Approved (Corporate)

In business since 1995

Free estimates

Emergency services offered

"Had Groundworks install a drainage system and sump pump in our home’s crawl space. Anthony and his crew, Jordon, Uriel, and James were Outstanding. It was a three day job. They were on time every day and worked their tails off each day. It was a muddy job in cramped quarters. They never complained. Anthony kept me updated on the progress they made each day. Anthony shared pictures of the job as it progressed. They cleaned up the job site each day. Anthony went over all the details at the completion of the job and answered all of my questions. The whole process was Great. From the initial inspection done by Kristy to the office staff and the installation. The communication was also Great. I highly recommend Groundworks for a complete and thorough job."
Foundation
Foundation
Foundation
Concrete
Concrete

+16

Response time2 days
125 neighbors recently requested a quote
Recommended by83%of homeowners
Avatar for Harts Plumbers, Electricians, & HVAC Technicians
Harts Plumbers, Electricians, & HVAC Technicians
4.6(
1,464
)
Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Rainier, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Emergency services offered

Warranties offered

"This company is so professional and kind. Anthony, the rep who came to do the estimate on a basement kitchen sink and shower installation was so knowledgeable. and patient, My elderly mother has moved in and is making our finished basement her new home, he addressed all her concerns and helped to make some smart choices. Lexi, the phone coordinator was lovely as well."
Prep Area
Waterfall Finished!
Excavation jobs and more!
 install grease trap for commercial kitchen
Delivery of Shoring

+334

40 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Pinpoint Construction LLC
Pinpoint Construction LLC
5.0(
7
)
Basement Drainage Channels - Install

Serving Rainier, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Credit card accepted

Our mission is to be a provider that brings back the personal touch with our customers. We will build a relationship that will last a lifetime after you see our quality work. As a locally owned and operated business, we feel invested in our clients and constantly strive for customer satisfaction. Call or message us to schedule an estimate today!

Gravel driveway
Ruts in the driveway which causing the water to run down the driveway?
Well utility trench
Gravel driveway
Driveway work in North Kitsap

+15

Recommended by50%of homeowners
Avatar for Harts Plumbers, Electricians, & HVAC Technicians
Harts Plumbers, Electricians, & HVAC Technicians
4.6(
1,026
)
Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Rainier, WA and surrounding areas

Approved

In business since 2013

Emergency services offered

Warranties offered

"Brandon was at the job on time and went straight to work, My Tenants were without hot water. Before noon the job was completed. It was easy working with Brandon and he is greatly appreciated. I bought membership with the company and for any future plubing concerns I look forward working with Hart Services/Brandon."
Digging out the old broken pipes
House Repipe
House Repipe
House Repipe
House Repipe

+13

Recommended by91%of homeowners
Avatar for Diversified Crawlspace Servs
Diversified Crawlspace Servs
3.9(
25
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Rainier, WA and surrounding areas

Approved

In business since 1992

Free estimates

Emergency services offered

"We had a foot of water in our crawl space after the snow and 6 in. of rain from the December 2021 storms. I had called several companies to come out to take a look and give quotes. Ethan from diversified was the 3rd quote we received. Ethan explained the issue, explained what they would do to remedy it, and answered all my questions. He sent me the quote which was very resonable. BE SURE TO GET SEVERAL QUOTES. ONE COMPANY QUOTED US DOUBLE OF WHAT WE PAID DIVERSIFIED. They were able to get a team out two days later. The team was on time, professional, and did really good work. We ended up needing a sump pump due to ground water coming up. They applied a mold application and completed the work in a day. I highly recommend these guys and did my research prior to having them do the work. I am very impressed and happy we chose them."
crawlspace drainage
crawlspace drainage
crawlspace drainage
crawlspace drainage
crawlspace drainage

+18

6 neighbors recently requested a quote
Recommended by60%of homeowners
Avatar for Rain Pros Inc
Rain Pros Inc
4.7(
435
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Rainier, WA and surrounding areas

In business since 2006

Free estimates

Warranties offered

"These guys did a great job on the drain cleaning and explaining to me how the drains were connected beneath and outside my home. I felt like the price was quite fair. I had gotten an estimate to re-do a french drain outside my basement after that experience, and I told them I would get back to them in a few months due to cost. It was a good price, but repairs are repairs, and most of them are expensive. I tried getting these guys out again a few months later, but I had a really hard time getting in touch with anyone. I was happy with the work from before, for sure."
Before
Sump Pit with Sump Pump
Downspout coming off of a barn
4-inch PVC installed with the black asphalt emulsion and custom made flashing up.
Excavated

+51

Recommended by94%of homeowners
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Basement Waterproofing FAQs, answered by experts

No, your basement dehumidifier doesn’t need to be on 24/7. While it’s an excellent tool for tackling damp, musty air, especially in humid seasons, leaving it running nonstop can backfire. Over-drying the space can mess with your sinuses, warp wood, and even crack certain materials. Instead, only use your humidifier when moisture levels rise above 50%, and then give it a break when the humidity levels drop.

Waterproofing or encapsulating protects against moisture, preventing mold growth and structural damage. These services also enhance energy efficiency and improve air quality by keeping humidity levels in check.

Flooded basement cleanup can take anywhere from a few days to several weeks, depending on the extent of water damage, the type of water involved, and the need for repairs or mold remediation. Severe cases with structural damage or extensive mold may require longer timelines. Quick action and professional help can speed up the process and reduce overall damage.

The most flood-resistant materials you can count on in a flood scenario are concrete, closed-cell insulation, foam insulation (also known as expandable foam), pressure-treated wood, marine-grade plywood, and ceramic tile. When a material is flood-resistant, it can withstand direct contact with floodwater for at least 72 hours without being significantly damaged.

Egress windows or doors are required in finished basements to meet safety and building codes. If your basement is unfinished and used as a storage space, egress windows are not required, but anything considered a habitable space must have an additional point of egress in addition to the stairs.

The Rainier, WA homeowners’ guide to basement waterproofing services

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