St James Basement Waterproofing

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Long Island Chooses Us

Linda Weiss

We feel very fortunate to have found this company. I met with Mike regarding leaks in the basement. He assessed the entire house, gave me options and clearly explained the process. Everyone from Mike, to the secretary in the office to the workers were absolutely amazing. They did the work as promised, gave us a reasonable price, and left the place immaculate. We could not be happier with the results! This is a great family owned business. You can’t go wrong!

rose smith

The work was done with the utmost professionalism and competence. The service representative was very thorough in examining the dehumidifier, air purifier and sump pump and provided any service needed including draining the pump.

Craig Todaro

Mark took it upon himself to come to my home and examine my issue himself. He is knowledgeable not only in basement waterproofing, but also in land grading, excavating and several other adjacent topics. While it was concluded my issue was not foundation oriented, he did not hesitate to propose several other creative ideas to help address my issue. He has a great disposition, and I would not hesitate to recommend his services to others.

Linda Russo

I bought my house 24 years ago, and for 24 years I lived with water coming in to my finished basement. A few years back I hired another company to put in a French Drain System which never worked. As the storms got worse the water in my basement increased. Because of my previous experience I was hesitant to hire another company until I read about ACM and met Mark who was highly recommended by my Home Service Company. Mark spent about 2 hours explaining the process, and what was needed. In February 2025 ACM put a extensive French Drain System which included taking down the sheet rock walls, demoing tile and placing a membrane along the whole perimeter of the drain system. All of this work was completed in 3 days exactly what Mark said. The guys were professional, polite, and best of all they were careful to save my Radiant Heating System which was under the tile. Since the French Drain System was placed I have not had 1 drop of water coming into my basement. I am very grateful to Mark's ACM Company, and was able to refinish my basement without fear of water damage. I highly recommend ACM Basement Water Proofing to all who are having water problems with their basement.

Maria Lacoste

ACM Basement Waterproofing did an excellent job in my basement, no more water intrusion. The job was handled professionally and on time. I am happy to recommend them.

William Rothstein

I chose ACM because of their "Best of Long Island" award, and I'm glad I did. Mark's crew (led by Joe) installed an interior French drain and a sump pump in our basement. Six months later, we've had no problems with water. These guys know what they're doing.

Links2282

My wife and I would like to say thank you to Mark and his team for their excellent work installing a French Drain in our finished basement. For years we had to worry about flooding if we got a large amount of rain in a short time. The entire staff was totally professional. knowledgeable, competent and efficient. They were clean and caring and after each day they protected the whole worksite. Without a doubt, we would recommend them for all your basement waterproofing needs.

Peter Webb

I called acm after finding water in the basement. Mark answered the call and quickly helped diagnose the issue. He guided me to check baseboard and sure enough a broken valve was causing this leak. It's good to find someone to help a homeowner without rushing to take their money. It's good to find a honest business man

St James Basement Waterproofing Solutions That Really Work

St James Crawl Space and Basement Waterproofing for Every Home

If you own a home in St. James, you’ve likely seen how quickly a basement can get damp or a crawl space can start smelling musty—especially after heavy rain or a Nor’easter rolling in off the Sound. Older homes near Lake Avenue, Moriches Road, or even tucked farther from the coast aren’t immune. Rising groundwater and shifting soil can quietly damage your foundation before you see the signs.

That’s why so many St. James homeowners turn to ACM Basement Waterproofing. We offer real, lasting solutions—basement waterproofing, crawl space repair, and foundation repair—all designed to tackle the root of the problem, not just cover it up.

If you’ve noticed moisture, musty smells, or cracks forming, don’t wait for things to get worse. Schedule your inspection with ACM today and take the first step toward a dry, secure home in St. James.

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Stony Brook Basement Waterproofing Customer Reviews

“A great experience. Work was performed as expected, exactly when stated by Mark. Staff is professional and caring. Upon completion of project, you wouldn’t even know they had been there!” – George, Saint James

Take a look at our testimonials page for reviews from customers from other towns.

Keeping Your St. James Basement Dry

At ACM, we know how stressful it can be to deal with basement water, crawl space moisture, or foundation issues. These problems often start small—but if left unaddressed, they can affect your home’s structure and your peace of mind.

That’s why homeowners in St. James trust us for honest inspections, clear recommendations, and long-term solutions. Whether it’s basement waterproofing, crawl space repair, or foundation work, we’re here to help—no pressure, no guesswork.

Reach out today to schedule your inspection and take the first step toward a safer, drier home in St. James.

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