Mount Sinai 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

Mount Sinai’s Complete Basement Waterproofing Contractors

Mount Sinai Basement and Crawl Space Waterproofing for Dry Homes

We understand why Mount Sinai homeowners hesitate to call waterproofing companies:

Fear of high-pressure sales
Worried about unnecessary work
Concerned about disruption
Skeptical of “free” inspections

Here’s our promise to Mount Sinai: No sales pressure. No invented problems. Just honest assessment of your home’s needs, whether along Route 25A or Crystal Brook Hollow Road.

But waiting has real consequences in Mount Sinai. Every season without proper basement waterproofing means more moisture damage, higher repair costs, and decreased home value. The gentle slope toward Mount Sinai Harbor means water naturally flows toward foundations—it’s physics, not sales tactics.

ACM Basement Waterproofing earned Mount Sinai’s trust through honest work and fair pricing. Ready for a no-pressure conversation about your foundation? Call today—waiting won’t make water problems disappear.

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Prepare Your Mount Sinai, NY Home

Mount Sinai, NY Building Department
Address: 1 Independence Hill, Farmingville, NY 11738
Phone: 631-451-8696
The Building Department Contact Form
Hours: Monday – Friday, 9:00 am – 4:15 pm

Mount Sinai, NY Links:
Town of Brookhaven Building Department Website
Renew Your Building Permit Application
Building Permit Application
Zoning Information

Your Local Home Experts in Mount Sinai, NY

We’ve put together a list of contractors to help you with your Mount Sinai, NY, project. We provide this as a helpful resource, yet we do not formally endorse any of the listed companies.

Plumber
VP Plumbing & Heating
36 Chestnut St, Mt Sinai, NY 11766
631-403-0014

Electrician
HomeOps Electric
640 D Belle Terre Rd, Port Jefferson, NY 11777
631-296-0946

Driveway Paving Contractor
Hickory Homes and Properties, Inc.
103 Kisco Ave, Mt Kisco, NY 10549
914-215-7429

Landscaper
Erie Bros.Maintenance & Landscaping, Inc.
615 Canal Rd, Mt Sinai, NY 11766
631-403-4170

Masonry
Blue Diamond Masonry
3 Albright Rd, Coram, NY 11727
631-698-5219

Mount Sinai Basement Waterproofing Customer Reviews

“Mark was very professional and reliable.” – Julie, Mount Sinai

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

Mount Sinai Basement Waterproofing

“Will waterproofing disrupt our lives?” No—most Mount Sinai basement projects take 2-3 days.
“Is foundation repair messy?” No. We protect your Mount Sinai home like our own.
“Can you really fix our crawl space?” We’ve solved worse problems than yours.

Mount Sinai homeowners appreciate straight answers and quality work. That’s ACM. No games, no pressure, just dry basements and solid foundations throughout Mount Sinai. Ready for honesty? Call us.

Protect Your Home Today

We make it simple, affordable, and stress-free — with guaranteed results.

*50% Off Materials Discount applicable to new projects over $10,000
*All financing is subject to credit approval. Your terms may vary. Payment options through Wisetack are provided by our lending partners. For example, a $5,500 purchase could cost $253.54 per month for 24 months, based on a 9.9% APR, or $1,833.33 per month for 3 months, based on a 0% APR. Offers range from 0 to 35.9% APR based on amount requested and creditworthiness. Not all merchants and lending partners participate in 0% interest programs. Terms range from 3 - 120 months and may vary based on merchant, lending partner, or transaction size. State interest rate caps may apply. No prepaid finance charges or participation fees. See additional terms at wisetack.com/faqs.
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