Allied Waterproofing & Drainage

★★★★★ 4.9 / 5 (52)
Emergency Call


: Seattle, WA 98101
: (206) 624-7333
: http://www.alliedwaterproof.com

Company Overview

Allied Waterproofing and Drainage was established in 1990 has offered top-notch waterproofing and drainage services in the Pacific Northwest for more than 20 years, maintaining the foundational values we established since our early days: superior quality, trustworthiness, integrity, and consistency.

From 1990 onward, Allied Waterproofing & Drainage has established a strong reputation for delivering exceptional craftsmanship and budget-friendly solutions across a range of drainage needs, waterproofing requirements, sewer line and water pipe upgrades.

We continue to operate today with the foundational values we established from our humble beginnings: Superior quality, Trustworthiness, Integrity, and Reliability.

Business Services

  • Drain installation
  • Drain repair
  • Foundation construction
  • Foundation repair
  • Moisture or vapor barrier installation
  • Moisture control inspection
  • Moisture control installation
  • Moisture control repair
  • Plumbing inspection
  • Plumbing installation or replacement
  • Plumbing repair
  • Sewer installation
  • Sewer repair
  • Sump pump installation
  • Sump pump repair
  • Water pipe installation
  • Water pipe repair
  • Waterproofing inspection
  • Waterproofing installation
  • Waterproofing repair

Business Location & Hours



Mon:8:00 AM - 5:00 PM
Tue:8:00 AM - 5:00 PM
Wed:8:00 AM - 5:00 PM
Thu:8:00 AM - 5:00 PM
Fri:8:00 AM - 5:00 PM
Sat:Closed
Sun:Closed

Recommended Customer Reviews

Sabrina S.
★★★★★

I'm very happy with the work that the crew did in my crawl space. Paul provided the estimate, and broke the estimate up into two potential jobs--one crawl space drainage system with sump pump and interior trenches and one a job that I might do in the future that involves diverting down spout water. I appreciated that Paul conducted a thorough review of the problems in my crawl space and walked around the property to get a full understanding of the issues that were causing standing water in my crawl space. It is a 1958 house which had a lot of standing water in the crawl due to an existing DIY sump pump that was not up to code and leaked. Paul's estimate also included a drawing of the system which helped me get a better sense of the scale of the repairs.

The crew did a great job and took 3 days for the extensive work. The crew even fixed an issue that was caused by a totally different worker without me bringing it up--they repaired the screen on the vent to prevent animals from getting into the crawl space.

The work area was also left very clean. Thanks for the hard work and for the repairs!

Scott M.
★★★★★

I have worked with Paul on a number of projects, but initially he redid our sewer system. His was the best price, value, and quality of work hands down. I can't recommend them highly enough.

Kabila W.
★★★★★

Allied Waterproofing & drainage came highly recommended by a friend who knew someone who used their services. They installed a French drain in my basement which seemingly took in water from everywhere. The guys worked hard for four consecutive days and did a fantastic job. They even went the extra mile and rerouted the water expelled from the sump pump directly to the sewer line (the previous homeowner had some makeshift inefficient convention going on). I'm happy to report that my basement is dry and my piece of mind is restored.

Ian J.
★★★★★

Paul & his crew are fantastic. They were among several companies giving me bids (guidance and quotes alike) on water coming into our property and house. You get a spectrum of bids of course, ranging from questionably cheap and vague to extremely high cost & large scale solutions for worst case scenarios depending on the perspective of the estimator.

Allied came through with a few options for each problem I had, and carried great quiet confidence they knew how to solve it. They gave very fair rates for the work, were extremely quick and efficient while on project, and attentive to anything I brought up.

These guys have done 3 projects for us now, and I couldn't be happier with the results. We did exterior & interior french drains to stop water coming over the foundation line AND up from the ground floor level. They also added another drain in the back corner of our yard which was a year round mud pit. The results are perfect: dry house, useable yard, and my sump pump barely fires anymore, even during rain.

I HIGHLY recommend Allied waterproofing, and will certainly call them again in the future if need be.

Kal T.
★★★★★

Can we give them six stars?  Allied Waterproofing and Drainage is tremendous.  We had two vendors give us estimates on resolving a gutter drainage situation.  The first vendor proposed a solution that would have torn up our entire basement and cost about $17,000.  Allied came out and the gentleman immediately grasped that the solution to the situation only required re-directing some gutter drainage.  He showed us how he could easily re-route the water to a safe place in one of our gardens with a minimum of digging and disruption.  His proposal was under $3,000. We hired them.  When their crew showed up, they figured out an ever better way to route the water than we had considered, so as to hide the pipes.  Once done, they then put everything back the way it had been, even re-installing dirt we had dug out of a flower bed.  By the time they were finished, I couldn't tell where they had dug, as they were able to put the topping gravel back so it looked like nothing had ever happened.  I still can't figure out how they did it.  The whole job was done in one day and their clean-up was superb.  I would hire them again without hesitation. Super-highly recommended.

Bu J.
★★★★★

This company is professional. They got my drainage issue resolved with a perfect solution and fair price. Highly recommend them!

Aaron E.
★★★★★

In 2016 my basement flooded after back to back winter rain storms. Paul and Allied Waterproofing gave me a competitive bid to put in a perimeter drainage system which allowed water to go around the basement, not through it. The work was quick and efficient and the system worked flawlessly for years. This past winter we again got back to back storms which caused some water to seep into one corner where a water stopping membrane had been cut too short by carpet installers. Paul and his team once again came out swiftly and addressed the issue without fuss. I would highly recommend Allied for any similar projects.

Thaddeus G.
★★★★★

Both Paul and the staff were responsive, thorough, and clearly communicated every aspect of the job from start to finish. Great people to work with. Also, they all closely followed good COVID protocols. I highly recommend them .

Jen B.
★★★★★

Agree with previous clients - never been so happy to part with my money. From the start, Paul was incredibly responsive, their office team was timely and communicative about scheduling...and when their team showed up on site, they had on masks and clearly had a defined covid protocol to keep themselves and their clients safe. The team quickly completed the work, explained in laymen's terms what was going on and cleaned up meticulously. I'd highly recommend Allied and will be calling them again when we work on the south side of our house. Couldn't be happier with the entire experience.

Ismini R.
★★★★★

A professional and hard-working team who did a thorough job. Upon checking their own work, they also found another issue unknown to us that is simple to solve but was off of our radar. Would recommend!

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