Armando was teriffic, we had sump pump and encapsulation done at our house. I had messaged him thru his website in the evening, and he replied via email he could see my house for a quote the next morning. Super fast After we scheduled the work, his guys did the work super fast and clean. Really appreciate their professionalism, cleanliness, and friendly attitude. I had made multiple inquiries for quotes to other companies and his explanation and guidance for the work was the most 'human' to me. It great hiring their team for the job. read more

Chan drainage installed a French drain behind my house because water was seeping into my crawl space from the hill behind my house due to heavy rain. They did an excellent job and the price was fair, I had also received positive feedback from a neighbor that had used them for multiple projects which made me more comfortable going with them. Would highly recommend. My project took place July 2025, and my crawl space is no longer wet! read more

Armando and his team did an amazing job. They handled a very complex drainage project extremely well. They were very efficient, professional, and clean. It was very impressive. read more

Armando and his team are superb. They solved our decades-long water issues with a thoughtful, efficient, and affordabe reconfiguration of our drainage system. Everyone is friendly. Excellent communication. Durable work. Came back to show us how to maintain it ourselves. They are great. Five stars five stars five stars five stars. read more

I couldn't be happier with the work Chan drainage did at my home. From the beginning, Armando, the owner, showed true professionalism and took care of everything. He kept me informed, answered my questions, and made sure the job was done right. His crew worked hard and delivered outstanding results. If you're looking for reliable and high-quality service, I highly recommend them! read more

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Needed a failed sump pump replaced (it was over 10 years old). Setup the appointment and the crew of 2 arrived on time. They got right on the task and quickly removed the failed unit and swapped in the new pump. Fast, efficient, and thorough. Thanks for the completed service! read more

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We were dealing with a flood issue in our Novato backyard. Every time there was a storm, water would breach our ADU. We wanted a French drain system so we contacted Armando for a quote. He came the next day, took a look at our large backyard and knew right away what to recommend. There was no where for the storm water to go so he suggested a sump pump to discharge the water out to the street. The quote was reasonable so we went for it. His crew was fast, clean, and efficient. A fairly large project, they completed it in two days. He even helped us out with the electrical work for the sump pump. After these last storms, our backyard is dry as a bone, no more worries about our yard. We highly recommend Chan Drainage. Gracias Armando read more

Chan Drainage and Moisture Control - Sump pump - Waterproofing Near Me - Novato, California

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The job was to install a channel drain. Our existing 5" square drain could not handle the heavy rain we've been getting. Plus it didn't take long for leaves to clog it, resulting in water flooding into our garage. Crew showed up around 8:30 am and finished around 2:30pm. They were hard at work, friendly, and clean up after. Armando came by at the beginning of the job to tell us what they are going to do step by step and thank us for choosing his company. Being thankful is much appreciated. :-). read more

Chan Drainage and Moisture Control - Waterproofing Near Me - Novato, California

Awhile back a friend asked me to find someone to improve the sump pump setup in his building. The existing setup was quite nice; the hole ("sump") was big, and he had a second backup pump resting on some pavers in the hole, so that if the primary failed or was overwhelmed the backup would kick in. The one weakness: both pumps depended on grid electricity, PG&E. He had a gasoline-powered generator, but that introduced a whole new set of issues; the right solution seemed to be a DC-powered backup with a trickle-charge low maintenance battery. I contacted a company that seemed to specialize in this type work, but was stunned by the price quote. I shopped around, talking to two plumbing supply companies, looking for a strong recommendation. No luck. I spoke with a plumber who had done great work for me in the past; he didn't want to work in that hole. Finally I called ChanDrainage. I wasn't convinced that this was the right company (they seemed to do basement waterproofing), but Armando Chan agreed to come by when he was in the area, and quote the work. Anyone can quote a job, but by this time I knew just enough about sump pumps to weed-out the flakes. Armando was the real thing. I was interested in replacing my backup AC with a DC, supported by two batteries, giving me twice the running duration. Armando heard me, and offered a variation on that idea. He quoted me a price that definitely worked. He said that he was pretty busy, but might be able to slip me into the schedule. I crossed my fingers! A week or so later Armando texted and asked his crew could do the install on Wednesday. Of course! His crew showed up, just as expected. Armando had come-up with pretty clean solution. Instead of retiring one of my ACs, he would put a backup on each of them, elevating each pair so that my pumps triggered one after the other. Ismael, Carlos and Luis got to work; it was nice to work with a crew that clearly knew what they were doing. I'm realizing that this is a long review, and most of it is about nuances of the task. I guess my point is that I'm smart-enough to recognize a great sump pump design and installation team, and I highly recommend Armando and his crew. read more

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Armando and his team were professional and the communication around project expectations and execution were exceptional. I would recommend Chan Drainage to any family or friend. read more

We've been experiencing severe water intrusion issues in our crawlspace that have resulted in sitting water and humidity issues that have damaged our hardwood flooring above. Our backyard is a terraced hill, so all the water was coming down against the backside of our house as there was no drainage in place. We needed to have a French drain, waterproofing membrane and Mira drain installed along the exterior stem wall and foundation of our home to rectify those drainage issues. We collected multiple estimates from highly reputable companies throughout the Bay Area. Chan Drainage's estimate was significantly more affordable than the others and provided a more detailed work scope. Armando also said that he could get the job done in 2-4 days whereas the other companies said it would take them a couple of weeks. Obviously, we decided to hire Chan Drainage for the job, and I'm so happy we did!! Armando sent a crew of 6-8 guys each day. They were organized, respectful of our property, and detail-oriented. It was obvious that they knew exactly what they were doing and excelled at team work. I was amazed that they completed the 2ft deep by 2ft wide 130ft +/- long run of trenching in less than 1.5 days!! Armando even added a catch basin, new concrete footer for our side gate post (which had to be removed for the trench) and multiple clean outs to the scope of work at no additional charge to us. When I asked him what the cost would be for those added work scopes, he said that he always honors his original estimate and that, since he forgot to include those items on it, he would not charge us for them. I was so impressed by his integrity that I decided to pay him a little extra as a thank you. I will provide an updated review once the rainy season commences as, even though I'm confident that Chan's work has resolved our crawlspace's water instruction issues, I won't be able to state as much with 100% certainty until after we've experienced a few downpours. read more

My wife and I are so fortunate to find Armando and his wonderfully hard working team. Armando was very informative and knowledgeable in what is needed to create a vapor barrier in our crawl space. He was also able to address the support posts. I can't imagine spending a few minutes in a crawl space. His team arrived to work promptly every day for hours creating french drains, installing a barrier and sump pump. They also trenched outward. When all was done the job site was immaculately clean. Thank you so much Armando and his team! read more

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Armando and the team worked hard and did what they said they would. Highly recommend. A+

The owner Armando is on time, professional, and stands by his work. He did our crawl space and also fixed our HVAC vents. Would 100% trust him again for any other work we need. read more

another 5++ star review for Chan Drainage. As others have said: Armando is responsive, knowledgeable and delivers a high quality service. His crew, led by Pablo, were just fantastic: careful, thorough, conscientious, skilled, and clearly committed to doing an outstanding job. The final proof will be in the pudding when the next rains arrive but I am super happy with Chan Drainage and recommend highly. Our neighbor recommended them to us, and we are so glad we chose them over the other bids. you will be too! read more

I had Armando and his crew install a wide rock culvert drain into a large catch basin with a Zoeller sump pump and a discharge line. I found Armando to be the most knowledgeable about drainage systems compared to other contractors I talked to. His team did good work. Armando went the extra mile to ensure the job was done right. read more

I had four different companies quote and Chan Drainage was the cheapest. I was very pleased with the work they did. Not only did they do exactly what they said they would, they covered some of the extra expenses that the other companies said they would not. They were able to run the electrical for the sump pump, when no one else would offer that. Chan Drainage was also able to run the outlet from the sump pump all the way out to the street, whereas the other companies said they would terminate the outlet somewhere in my yard. read more

I've used Chan Drainage for 3 projects now at my house and have been satisfied each time. The crew comes on schedule until the work is done and they do not leave for other jobs in between. The owner himself comes to check on the work and to ensure that you are satisfied with the progress. The pricing is also very competitive. I would highly recommend using them! read more

Highest of marks!!! Met with Armando on a Tuesday to get a bid for a problematic storm drain at the base of my garage. My driveway is steep down to the garage and flooding in the garage has been chronic and consistent in the last few years. Armando's bid was very reasonable to reroute and repipe the drainage along the side of my house (about 100 ft) and let gravity take its course. The job required his crew to saw concrete, jack-hammer, PVC, and holding tank. His team then poured new concrete and cleaned up perfectly. Job took them 2 days total. I give the overall process/project from first contact to completion a 10 out of 10. I would use Chan Drainage again and i will recommend them to everyone. read more

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Armando's expertise and work is top notch and has completed two projects for me. The most recent was to deal with groundwater that was damaging the foundation of my home. Armando came up with an ingenious plan for a French drain system connected to a sump pump at a very reasonable cost. He even added a slope in the newly poured concrete to prevent pooling of water in a problem area. His crew executed the job perfectly and in only four days. We were amazed at how little noise they generated when demolishing the old concrete. They even moved all the stuff out of the basement and back inside, making the entire project stress free. Much thanks to Armando and his crew! read more

I would highly recommend Armando and his crew at Chan Drainage. We needed to add a sump and clean up our under house situation. The team was professional, fast and great to work with, they came back to do some additional insulation work too and I'm hopeful that we can have them for a bigger farm drainage project again when the ground is right. Armando is conscientious and so polite, I wish all contractors took the time to explain with care as Armando! Five stars! read more

Very good experience working with Armando on a house drainage project. He sent a lot of workers every day to get the job done quickly and efficiently. Everything was put back where it was supposed to go, the concrete work on top of the french drains was clean and neat. When I had an issue, he resolved it. There's not a lot of in-process communication, but quick responses to any questions. Recommended. read more

We interviewed several companies to install a vapor barrier and drainage in our crawl space. Armando, the owner, was very responsive and patient with our questions as we analyzed our options. He was very clear on what needed to be done (and what wasn't necessary) and provided a fair bid. His team was very efficient, respectful and hard working. Then end result looks great and already dropped humidity by 30%. read more

Armando did exactly what was promised at a fair price. Very professional and great communication. He really knows water intrusion and drainage. AAA+ read more

Armando and his team are incredible. We had a problem with water overflow behind our house as it backs up to a hill of open space. Our neighbor had redone his stairs next to our fence and with the dirt disturbed, we suddenly had flooding issues. We had a temporary fix with sandbags but it needed a more expert eye to really solve the problem. Armando came promptly to give us an estimate... and he quickly diagnosed the issue and proposed the solution. He installed a drain system behind the retaining wall that drops into an external drain that runs along the side of the house and out to the front yard and drains to the street. His price was the most reasonable of all the estimates and he just gave me a feeling of confidence. His team arrived promptly and worked very hard for two days putting the plan in place. It was immediately evident that the water that was seeping behind the house and pooling was gone! Even when I had a concern a day or two later, he immediately came back to address any concern and has been very prompt and responsive. The whole system works together in the most organized and efficient way. Everything clean and spotless and just so professional and nice to deal with us. I really can't say enough good things and we will most assuredly use them again if the need arises. read more

Armando and his crew did an extensive French drain project for our house 3 years ago and everything is still functioning very well which is huge peace of mind. I had received 4 different estimates, and not only was Armando's reasonably/competitively priced . . . . I had an independent drainage expert look at our property and review the bids. Each contractor had slightly different plans in the proposals for how to best address our serious drainage problem. He said Armando's plan was excellent and that he clearly knew what he was doing. He said, at the price for such extensive work, "run, don't walk" to hire Armando. Armando's crew did a massive job here in 7 days flat and were great all around. Armando has continued to be available for questions about the sump pump, battery backup, etc., as they have come up. Incredibly impressed. Glad I read all the stellar Yelp reviews; they were spot-on. read more

I am grateful to have found Armando and Chan Drainage. I have battled water in my crawlspace and garage and needed to replace an entire home drainage system. Armando came to my home immediately, provided a quick and straightforward estimate, and took the time to explain everything he recommended in detail. He is, hands down, a drainage expert. That was before the work even started. His crew is a fine-tuned machine. This type of work is not easy, but they are very good at what they do, and it shows. They all work with a synergy that I rarely see. The work is tight and professional, and you can't help but enjoy watching what they do. I always notice that some companies take shortcuts, emphasize speed over quality, and "get it over with" --- this is not the case. With Chan, you notice that they go the extra mile and work with a perfection mindset; in the end, watching them work is a privilege. I am one of the lucky ones to see them in action. They even left the surrounding home in better condition than when they arrived. I cannot say enough good things about Armando and his crew. Incredible work and craftsmanship. Thank you. read more

Armando and the team at Chan Drainage are such hard workers and did an incredible job fixing the drainage behind a large retaining wall on our hillside home. The cost was very reasonable, especially considering the warranty they offer and the impeccable job they did. Will absolutely be using them again should we need it. read more

Armando is super responsive and reasonable priced. His crew is knowledgeable and cleans up very well. Highly recommend!

You can rely on Chan Drainage for their excellent service, whether it's installing French drains, vapor seals, or repairing water leakages that arise. I know their work is good because other contractors who see it tell me what a great job they did. They also work closely with you as a long-term customer, which is crucial for understanding your systems and potential issues that may arise in the future. You are in good hands with Chan Drainage. read more

Excellent execution of our French drain project by an experienced and hard working crew. We were so impressed with the professionalism and attention to detail from every member of the Chan team. Highly recommend Chan! read more

I have a hillside home with a significant downslope coming right into my crawlspace and downstairs finished basement. It's been a battle against the water each year since we moved in with all the rains of the recent years. Armando and his crew did excellent work adding French drains around the perimeter of the home and along the interior basement stairwell which involved drilling and pouring new concrete. They also encapsulated our crawlspace so it's clean and much more usable as storage now. I waited until this season's rains before leaving a review. I'm happy to say that the work Chan Drainage did made it through multiple atmospheric rivers without a drop of water entering the basement and the crawlspace is no longer a muddy swamp. I couldn't be happier to finally have it fixed! Thank you Chan Drainage! read more

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This is an update to a review I wrote on 5/31/24 regarding the work performed by Chan Drainage on water I had coming into my basement under the foundation. Although I was happy with the work they performed, there was really no way to test it like a good rainstorm. We received over 6" of rain during the last two days and my basement is dry! Great job! read more

If anyone is looking for a solid epoxy floor, call Chan Drainage LLC! Armando was very responsive, provided fair pricing and did a quality job. We supplied materials but didn't have enough epoxy to coat the sides of the garage - Armando picked up a color to match and got the job done. His team helped us move heavy items too, we are thrilled with the result! Really honest and fair guy, highly recommend! read more

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Armando and his crew completed our drainage project quickly and professionally. He was recommended by a good friend and is fully licensed/insured. I highly recommend Chan Drainage. read more

I am real estate Broker for over 40 years and I am so luck find Amando Chan Drainage company in internet do my crawlspace and garage water problem I be battled water problem so many years he came check around give me ideal and warranty the job 5 years price very reasonable I will keep referral him to my clients for sure thank you Chan read more

Fast service, high quality work, professional job. Highly recommend for your crawl space needs

Armando Chan the owner of Chan Drainage is the guy to call for drainage problems. He has been in the business a longtime and understands the flow of water and the best way to fix problems. The work also comes with a 5 year warranty. We had a room in the lower story of the house flood in one of the atmospheric rivers we had. Mr Chan put in French drains and tied the new gutter drainage pipe into the system. No sump pumps that fail when the electricity goes out. He came out within two days of calling him to look at the job despite being in high demand. He explained what our options were and how to best fix the problem. He sent a detailed proposal to me that night. Mr. Chan sent four guys the first day and finished at 7 pm the 2nd day using six friendly, hard working, respectful, and experienced men. It was hard work but they seemed to enjoy it. At the end of day 1 they cleaned up all the tarps, and the room didn't look like buckets of dirt and rock had been carried through it. To excavate under the house they had to go through a newly carpeted room then through the utility door to gain access to the crawl space below the house. He had his guys excavate approx. 50' linear feet of 16" wide by 24" deep or 6" below foundation footing, and dig a drainage trench at lower retaining wall /foundation crawl space, and run drainage thru the exterior side under foundation. They also excavated 17' lineal feet of 16" wide x 20" deep drainage trench at exterior back left side of house and finished it off nicely. I add this detail as it was a big job and a hard space to access. We're so happy all the damage is complete. We're no longer cringing when we hear of more atmospheric rivers on the way. Highly recommend Armando Chan the owner of Chan Drainage. (415) 497-2517 read more

We had a fantastic experience with Armando and his team from Chan Drainage. If you are thinking of hiring them, you should. They did a french drain and sump pump for us. The price was fair and the work was completed on time and as scheduled. The team also left our yard spotless when they were done. We have worked with a number of different contractors over the years, and Chan is one of the best we have encountered. read more

We had water coming into our basement from all sides of the house, and I had several contractors tell me what a huge and complicated issue this would be to resolve. Armando was incredible - he knew exactly what needed to be done, explained it to us in simple terms, and was super patient with all of our questions. His quote was far below the others we received for this work. Not only that, but the work his team did was impeccable. They were unbelievably fast, took great care of our trees and plants that needed to be uprooted and then re-planted, and left the place spotless. We've just had some major rain and the basement is bone dry - couldn't be happier with the work they did. Honestly, don't waste time looking for other quotes - Chan drainage is the best out there. read more