Long Island's Trusted Foundation Repair Specialists
We diagnose honestly. We fix permanently. We don't sell what you don't need.
Nassau and Suffolk County homeowners call us when they're done being scared and done being sold. We hold Nassau DCA and Suffolk Consumer Affairs licenses, carry $500K liability, and we'll tell you straight what your foundation actually needs — and what it doesn't.
Get Your Free Foundation Inspection
Response within 1 business hour
Nassau County DCA Licensed
Nassau County DCA Home Improvement Contractor License
Suffolk County Licensed
Suffolk County Consumer Affairs HIC License
$500K Insured + Workers Comp
$500,000 General Liability + Workers Compensation
BBB Accredited Business
A+ Rating (Pending Verification)
Free Inspection, No Obligation
Written quote valid 30 days
Locally Owned & Operated
Long Island family business
Why Long Island Foundations Fail
Long Island's unique geology — dense clay soils, high water tables, and freeze-thaw cycles — creates conditions that stress foundations year-round. Ignoring early signs leads to structural damage that's far more expensive to fix.
- Long Island's water table sits 2–6 ft below the surface — hydrostatic pressure on basement walls every day, year-round
- 45% of LI homes use 1955–1975 CMU block foundations — now 60–70 years old and entering the failure window
- 30–40 freeze-thaw cycles per winter widen existing cracks by 9% each cycle — spring reveals what winter did
- Clay soils in Nassau County and North Shore Suffolk shrink and swell with every wet/dry cycle, cracking block walls
- Levittown-era slab-on-grade homes (400K+ on LI) have no drainage — 70 years of settlement shows up as floor cracks
- Post-Sandy deferred repairs: 13 years of accumulated hydrostatic damage is now surfacing across South Shore flood zones
The good news: most Long Island foundation problems are repairable — and the sooner you address them, the less it costs. A hairline crack caught early costs a fraction of what a bowing wall or failed waterproofing repair runs.
Our Foundation Repair Services
From crack injection to full underpinning, we handle every foundation problem Long Island homes produce.
Foundation Crack Repair
Foundation cracks are Long Island's most common structural complaint — and the most misunderstood. Not every crack is an emergency, but every crack is a message…
Bowing Wall Repair
A bowing basement wall is Long Island's most urgent foundation problem. Hydrostatic pressure from our naturally high water table pushes outward against aging CM…
Basement Waterproofing
Long Island gets 45 inches of rain per year with no true dry season, a water table that sits 2–6 feet below the surface, and clay soils that hold water like a s…
Real Reviews from Long Island Homeowners
What Our Customers Say
“I was quoted $28,000 by two other companies. Long Island Foundation Pros looked at the same wall and told me I needed carbon fiber straps — $6,800. My basement has been dry for 18 months. I wish I'd called them first.”
Karen M.
Garden City · carbon-fiber-strap-repair
“My 1962 ranch in Levittown had water coming in every spring for as long as I can remember. They installed an interior drain system and I haven't touched a wet-vac since. Honest guys who showed up when they said they would.”
Frank D.
Levittown · basement-waterproofing
“As someone buying a house on the North Shore, I needed a foundation assessment before closing. They came out the next day, gave me a full written report, and told me exactly what I was dealing with. No upsell, just facts. I bought the house and had them fix it.”
Michael T.
Northport · foundation-crack-repair
“The owner was on site every day. They explained every step. When they found the crack was smaller than the photo suggested, they adjusted the scope and charged me less. That never happens.”
Diane R.
Massapequa · foundation-crack-repair
“After Sandy our basement has never been right. Three different companies over the years didn't fix it. Long Island Foundation Pros finally found the source — a failing footer drain — and actually fixed it. Should have called them in 2013.”
Robert S.
Freeport · basement-waterproofing
“I was terrified the whole house would collapse. They walked me through every crack, showed me photos, and explained what was serious and what wasn't. Turned out I needed a lot less than I feared. Honest and professional.”
Patricia L.
Syosset · bowing-wall-repair
“As a single mom having to deal with foundation repair, it was overwhelming until I called these guys. They explained everything, gave me options at different price points, and never pressured me. The job was done in two days.”
Sandra K.
Smithtown · foundation-crack-repair
“Another waterproofing company tried fixing it twice and couldn't stop the water. Long Island Foundation Pros identified the real source — a failed footing drain, not the wall crack everyone else kept patching. Dry basement ever since.”
James H.
Commack · basement-waterproofing
Join hundreds of Long Island homeowners who trust us with their most valuable asset.
Get Your Free Foundation InspectionWritten quotes valid for 30 days. No same-day pressure. No obligation.
Nassau & Suffolk Counties
Serving All of Nassau & Suffolk County
We serve homeowners throughout Nassau and Suffolk Counties. Click your town for local foundation repair information.
Nassau County
Suffolk County
Common Questions
Common Questions About Foundation Repair on Long Island
Have a question not listed here? Contact us — we're happy to help.
The Long Island Foundation Pros Difference
Honest Diagnosis
We tell you what your foundation actually needs — not the maximum we can sell you. If crack injection is the right answer, that's what we recommend, even when more expensive options are possible.
Owner Present on Every Job
The estimator and the crew chief are not strangers. Our owner is on-site for every project. You get continuity from inspection through completion.
Dual-County Licensed
We hold both Nassau County DCA and Suffolk County Consumer Affairs Home Improvement Contractor licenses — a requirement many competitors quietly lack.
No Pressure, Ever
Written quotes valid for 30 days. No 'sign today or the price doubles.' No manufactured urgency. Foundation repair is a major decision — take the time you need.
Ready for Your Free Foundation Inspection?
No obligation. No pressure. Just an honest assessment of what your home needs.
Written quotes valid for 30 days. No same-day pressure. No obligation.
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