Allied Waterproofing & Drainage
Company Overview
Founded in 1990, Allied Waterproofing and Drainage has provided top-notch waterproofing and drainage services across the Pacific Northwest for over two decades, maintaining the core values we set since our early days: quality, transparency, strong ethics, and dependability.
From 1990 onward, Allied Waterproofing & Drainage has built a trusted reputation for providing quality workmanship and affordable services for all kinds of drainage issues, waterproofing challenges, sewer line and water pipe replacements.
We still operate today with the foundational values we established from our early days: Superior quality, Transparency, Ethical practices, and Dependability.
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

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.

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.

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.

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

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.

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 .

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.

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!

Allied waterproofing ( Paul) stopped by to give us a quote and assessment for water in our basement. We had lots of water coming in , continuously over the last few months even with dry weather and no rain. We got quotes from other vendors, used a leak consultant to ensure it was not our pipes. Paul looked at the issue, listened to us and asked us to check our air conditioning unit. Though there was water seeping into the entire room- he shared that he has seen this happen before and we should check that anyways to make sure, though he would give us a quote anyways. What a lifesaver, it did turn out to be a leaking tube at the back of the air conditioning unit/ furnace where the water was traveling along the seam of the wall/ floor and coming into the room at a different point. He saved us a lot of money as the fix was $300 versus a major waterproofing effort for that part of the room. Love the integrity of this business. They get booked up very fast- we waited a month for an appointment- worth it.

Our basement flooded due to a formerly, incorrectly installed window well drain. Called Allied, who quickly inspected the problem, offered a number of options and gave me an estimate for my choice of options. Work crew showed up as scheduled, were very polite, explained what they were doing, and asked questions as necessary. They were quick and efficient plus re-landscaped and cleaned up yard to better condition than when they started. They demonstrated and tested the system to show me it was working and asked if I had any questions.
Invoice matched the estimate...but the work timeliness and quality FAR EXCEEDED MY EXPECTATIONS.
Great company, would highly recommend them!