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Verified Reviews for Basement Waterproofing pros in Cosmopolis, WA

*The Angi rating for Basement Waterproofing companies in Cosmopolis, WA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

*The HomeAdvisor rating for Basement Waterproofing companies in Cosmopolis, WA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

Last update on August 11, 2026

Find Basement waterproofing pros in Cosmopolis

Avatar for TerraFirma
TerraFirma
4.0(
99
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - RepairBasement Drainage Channels - Install

Serving Cosmopolis, WA and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"I had a patio that was in need of leveling. They knew exactly what to do and did it in a day. It looks great and I am very happy."
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%
106 neighbors recently requested a quote
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Avatar for Groundworks
Groundworks
4.3(
314
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Cosmopolis, WA and surrounding areas

Approved (Corporate)

In business since 1995

Free estimates

Emergency services offered

"Danila and Valeri did an excellent job on repairing the concrete on my driveway! These gentlemen are geniuses! I am very satisfied with their work!"
Foundation
Foundation
Foundation
Concrete
Concrete

+16

Response time2 days
149 neighbors recently requested a quote
Recommended by83%of homeowners
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Avatar for TerraFirma Foundation Systems
TerraFirma Foundation Systems
4.7(
12
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Cosmopolis, WA and surrounding areas

In business since 2005

Free estimates

Warranties offered

"So far so good. Rained hard last night and no evidence of flooding. We now have wall-to-wall carpeting so it better work!!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+11

Response time8 hrs
Response rate100%
Recommended by80%of homeowners
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Avatar for Expedeck
Expedeck
5.0(
24
)
Basement Drainage Channels - Install

Serving Cosmopolis, WA and surrounding areas

In business since 2015

Free estimates

Credit card accepted

"We have never had a more positive experience Start To finish on any project we have ever done. Each and every person stepping onto our property was outstanding!"
Andrew Farjo
Landscape Lighting with retaining walls
Accent wall / Seating wall with LED lighting
Andrew Farjo
Andrew Farjo

+31

Recommended by100%of homeowners
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Avatar for Creekside Excavation & Hauling LLC
Creekside Excavation & Hauling LLC
5.0(
7
)
Basement Drainage Channels - Install

Serving Cosmopolis, WA and surrounding areas

In business since 2021

Free estimates

Emergency services offered

"Immediate call back when requested quote, and great service. Crew workers are hard working and respectful. The work performed went way beyond the basics... from cutting down 3 ft weeds, removing debris, spraying for weed control, trimming under bushes, cleaning up edges of flower bed, and then spreading bark. I would hire them again, and recommend this company ?."
Foundation dig out & Pad Compaction
Land before road & landscaping
Progress including tree clearing
Finished Product
Additional Photos

+8

Recommended by100%of homeowners
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Avatar for Harbor Surface Solutions
Harbor Surface Solutions
3.7(
13
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Cosmopolis, WA and surrounding areas

In business since 2023

Free estimates

Offers commercial services

"I was very happy to find Harbor Surface Solutions to renovate my garage floor. It turned out very nice, we are more than happy with the job. Monica helped us pick the colors and her crew did a really great job installing our new floor. Previously our garage floor was always wet and we worried about mold, but it’s now like indoor space, waterproof, dry and looks fantastic. We highly recommend Harbor Surface Solutions. Thank you Monica for a job well done."
Shop floor renovation
Wet cracked concrete reno
Wet cracked concrete reno
Wet cracked concrete reno
Wet cracked concrete reno

+7

Response time11 hrs
Response rate94%
Recommended by12%of homeowners
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Avatar for Dumper Express Trucking and Excavating Service
Dumper Express Trucking and Excavating Service
5.0(
4
)
Basement Drainage Channels - Install

Serving Cosmopolis, WA and surrounding areas

In business since 2004

Emergency services offered

"Very well. They were on time and Everything went very smoothly. They were respectful of our landscaping and went around it."
Original view before we started clearing the lot.
Ocean Shores 319
New driveway
Ocean Shores 319
Ocean Shores 319

+3

Recommended by100%of homeowners
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Showing 1-10 of 20
Basement Waterproofing questions, answered by experts

The best ventilation for a crawl space is a fully encapsulated crawl space with its own separate ventilation system. If you go this route, ensure you have the proper crawl space code requirements done and dusted before encapsulating your crawl space with a moisture barrier and installing appliances that may not be up to the proper specs.

Basements are commonly converted into game rooms. The potential challenges you may run into include controlling moisture, working with low ceilings, limited natural light, and the need for additional electrical or HVAC work. Addressing these issues can add to the total cost, but it ensures a comfortable and functional space.

Yes, water coming up from the floor should be treated as an emergency. If you're unable to either identify or stop the source of the water on your own, contact an emergency plumber right away. In addition to harming your flooring, standing or pooled water can lead to water-damaged concrete.

Yes, professional installers use weather-resistant materials to protect the dish and cabling from environmental damage.

Yes, outside leaks can easily cause damage to your home if you don’t have waterproofing measures in place. Regularly check your property for signs of a leak, ensure your home’s landscaping is at least at a 5% slope, your basement windows are sealed, and you have an aligned gutter system to catch rainwater.

The Cosmopolis, WA homeowners’ guide to basement waterproofing services

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

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