STOP THE LEAK. PROTECT YOUR HOME.
Long Island's trusted masonry & waterproofing experts. Family-owned since 2000. Serving Suffolk & Nassau County.
Our Services
Complete masonry and waterproofing solutions for Long Island homeowners and businesses.
Interior Waterproofing
Keep your basement dry from the inside out. Professional systems designed for Long Island's high water table and unpredictable storms.
Learn MoreExterior Waterproofing
Stop water before it reaches your foundation with exterior membrane systems applied directly to foundation walls.
Learn MoreFoundation Crack Repair
Foundation cracks get worse over time. We fix them right the first time — maintaining structural integrity and preventing future damage.
Learn MoreFrench Drain Systems
Redirect water away from your home with professionally installed French drain systems that solve hydrostatic pressure problems.
Learn MoreSump Pump Installation
Essential basement flood protection. We install and service sump pumps across Long Island — Suffolk and Nassau County.
Learn MoreMasonry Services
Stoops, pavers, retaining walls, concrete — built to last decades. Custom designs brought to life by Long Island's experienced crew.
Learn More24/7 Emergency Service
Water doesn't wait for business hours. Neither do we. Call us any time — day or night — for immediate emergency response.
Free Estimates
Know what to expect before any work begins. Call or fill out our form for a no-pressure, no-obligation free estimate today.
GET FREE ESTIMATEWhy Choose Diamond?
Family Owned Since 2000
We're not a big corporation. We're your Long Island neighbors. Christopher Burke and his 5-person crew deliver personal service every single time.
Licensed & Insured
Fully licensed across Suffolk County (HI67081), Nassau County, and Town of Freeport (19283). You get complete peace of mind on every job.
Work Done Right
We don't cut corners. Ever. 25 years of Long Island homes prove it. We know Long Island's specific soil and water table challenges — and how to solve them.
WATER IN YOUR BASEMENT?
You're not alone. Long Island's high water table and heavy storms make basement flooding one of the most common problems homeowners face. The good news: Diamond has fixed it for over 1,000 Long Island homes — and we can fix yours too.
Wet Basement Walls
Water seeping through walls is a sign of hydrostatic pressure. Left untreated, it gets worse.
✓ We Fix This.Flooding After Heavy Rain
Long Island storms are no joke. If your basement floods after heavy rain, you need a real solution.
✓ We Fix This.Foundation Cracks
Cracks in your foundation allow water in and compromise structural integrity over time.
✓ We Fix This.Before & After
Real Long Island homes we've transformed — real results.
What Long Island Homeowners Say
"I'm not typically one to write a review but these guys were amazing. Owner was very responsive. Answered all of our questions, fair pricing, and impeccable work. They installed a french drain system in our basement and haven't seen an ounce of water down there since."
"I had every homeowner's worst nightmare—water coming into the home through cracks in the foundation. The owner diagnosed and solved my issues in a timely, cost effective, and professional manner. He answered my calls and texts at night and on the weekends. Their 5 star rating was earned."
"My basement would flood during heavy rains and my husband and I would have a lot of anxiety. Diamond's professionalism made us feel comfortable and the french drain system they installed is the best investment—not having to worry about our basement flooding again."
"Very impressed with this company. They were fast, scheduled within days of calling and cleaned up really well. Would definitely recommend."
"This is the second time using Diamond. We had water entering our basement and they did an excellent job waterproofing the outside foundation. The guys were so professional and did a wonderful job! I will definitely continue using Diamond on any future projects."
"Diamond repaired my western block foundation. They did a great job and are keeping an eye on it as it settles. I am glad to recommend Diamond to everyone and will use them again."
Proudly Serving Long Island
Suffolk County, NY
Complete coverage across all of Suffolk County
Nassau County, NY
Full service throughout Nassau County
Town of Freeport, NY
Licensed and serving the Town of Freeport
Towns We Serve
Not sure if we serve your area? Call us: 516-920-2543
BASEMENT FLOODING RIGHT NOW?
Don't wait — call us immediately. 24/7 emergency service available. We respond fast.
📞 CALL NOW: 516-920-2543Ready to Protect Your Home?
Get a free estimate from Long Island's most trusted masonry and waterproofing team. No pressure. No obligation. Just honest answers from people who care.
GET FREE ESTIMATE