RETAINING WALLS IN SUFFOLK COUNTY
Retaining Walls in Suffolk County, Built to Hold, Built to Last.
Concrete, stone, and masonry retaining wall installation and repair for residential, HOA, commercial, and municipal properties across Suffolk County and Nassau County. Self-performed — our own crews, our own equipment, no subcontractors.
4.6/5 Google Rating
· BBB A+ Since 2012
· Licensed in Suffolk & Nassau County
BBB A+ Accredited
Since 2012
Dan's Best of the Best
2025 Winner
Suffolk County Licensed
Contractor License
Nassau County Licensed
Contractor License
Fully Insured
General Liability + Workers Comp
WHY RETAINING WALLS FAIL ON LONG ISLAND
If Your Yard Is Losing Ground, A Retaining Wall Stops the Problem Before It Takes Your Driveway With It
Erosion, sloping lots, and shifting soil are common across Suffolk County. Areas like Dix Hills and Commack see sharp grade changes between properties that put constant pressure on soil over time. When that pressure doesn't have somewhere to go, it goes where you don't want it — into your driveway, your foundation, or your neighbor's yard.
A retaining wall stops that movement. It holds back soil on sloped or graded lots, protects driveways and paved surfaces from washing out, creates level usable space where a slope made the yard unusable, and separates a paved surface from a planted area cleanly. Built right, a retaining wall is a permanent fix. Built wrong — without proper drainage, correct footing depth, or the right material for the load — it fails and takes everything behind it with it.
We build retaining walls using our own crews and our own equipment. No subcontractors. That matters because retaining walls have to be built right the first time. A wall that fails can take your soil, your driveway, and sometimes your foundation with it. Our crews are fully licensed and insured in Suffolk County and Nassau County — so the work is backed the way it should be.
We work with concrete block, natural stone, and poured concrete depending on what your property calls for. The right material depends on the height of the wall, the load it needs to hold, drainage requirements, and the aesthetic of the property. We look at your specific site before recommending anything — what works in one yard may not be right for another.
OUR RETAINING WALL SERVICES
Three Types of Retaining Walls, One Contractor on Long Island
We install and repair all three retaining wall types across Suffolk and Nassau County — with the same crew, the same accountability, on every job.
Poured concrete and concrete block retaining walls for commercial, municipal, and residential properties — high-load capacity, long lifespan, suited for taller walls and heavier soil pressure.
Stone & Masonry Retaining Walls
Natural stone and masonry retaining walls for properties where aesthetics matter as much as function — residential landscapes, HOA communities, and commercial entryways across Long Island.
Retaining Wall Repair
Repair for leaning, cracking, or failing retaining walls before the damage spreads — mortar joint repair, wall reinforcement, drainage correction, and full reconstruction when needed.
KNOW THE WARNING SIGNS
Four Signs Your Retaining Wall Is Failing, and What Happens If You Wait
A failing retaining wall doesn't announce itself until it's already causing damage. These are the signs to watch for — and act on.
Leaning or Tilting
A wall that has started leaning forward is losing its ability to hold the soil behind it. This is the most visible sign of structural failure — and the longer you wait, the more soil pressure builds against a compromised structure. Don't wait for it to fall.
Cracking or Gaps
Horizontal cracks in a concrete wall or gaps appearing between block units mean the wall is moving. Vertical cracks may indicate settling. Either way, water is getting in and freeze-thaw cycles are making it worse every winter.
Water Pooling at the Base
Water pooling near the base of your wall means drainage behind the wall has failed. Hydrostatic pressure — water weight pushing from behind — is one of the leading causes of retaining wall failure on Long Island. It needs to be corrected before the wall gives way.
Soil Pushing Through
Soil visible through gaps or pushing out from behind the wall means the wall is no longer functioning structurally. This stage typically means partial or full reconstruction is needed — and the longer it continues, the more soil and surface damage you're dealing with.
Do Retaining Walls Require a Permit in Suffolk County?
Yes — many retaining walls in Suffolk County require a building permit, especially walls over four feet tall. Local codes vary by town, so requirements depend on exactly where your property sits. The same wall that needs a permit in Huntington may have different requirements in Babylon or Islip.
We handle the permit process as part of every retaining wall project. Getting this right from the start protects you from fines, ensures the wall is built to current code, and matters if you ever sell the property. An unpermitted retaining wall can become a title issue at closing.
If you're not sure whether your project requires a permit, call us at (631) 643-2443. We'll tell you straight.
Why Drainage Is the Most Important Part of Any Retaining Wall Job
A retaining wall without proper drainage behind it is a wall waiting to fail. Hydrostatic pressure — the weight of water-saturated soil pushing from behind — is one of the leading causes of retaining wall failure on Long Island. Long Island winters make it worse. Water gets in, freezes, expands, and pushes against the wall every season.
Every retaining wall we build includes a drainage plan — gravel backfill, weep holes, or a perforated drain pipe behind the wall depending on the soil conditions and the height of the wall. This isn't optional. It's what separates a wall that holds for 30 years from one that starts leaning after three winters.
If you're repairing an existing wall, we assess the drainage before we start. In most cases, drainage failure is the reason the wall is failing in the first place.
FEATURED PROJECT
Commercial Retaining Wall Installation, Long Island, NY
Split-face concrete block retaining wall — commercial property, Long Island, NY
LOCATION
Long Island, NY
APPLICATION
Street-Facing Commercial Property — Public Frontage
WALL TYPE
Concrete Masonry Unit (CMU) Split-Face Block
WALL HEIGHT
4.5 feet finished
WALL LENGTH
68 linear feet
COURSES
5 standard courses + solid cap throughout
BASE
18" continuous concrete footing · Below frost line · Compacted aggregate base
DRAINAGE
Drainage pipe + compacted gravel backfill — full wall length
SERVICES
Failed timber wall — full removal included
This commercial property on Long Island's main commercial corridor had a retaining problem that had been getting worse for years — and an original timber wall that had completely rotted through at the base, leaving the slope with no structural support at all.
The wall separated the property's front grade from the public sidewalk. After every significant rain event, soil was washing down the face of the slope and onto the walkway — a liability issue that had already drawn complaints and needed a permanent resolution. The property owner needed a wall that would perform structurally, present professionally on a public-facing commercial frontage, and last decades without the maintenance cycle that had plagued the original timber installation.
Fiorini removed the failed timber wall completely — all posts, walers, and deadman anchors — and excavated to frost-depth for a continuous 18-inch wide concrete footing running the full 68-foot length. Before a single block was set above grade, a drainage pipe was laid and compacted gravel backfill was installed behind the full wall run — because drainage failure is what destroyed the original wall, and addressing it structurally from the footing up is what makes the new wall last.
Five courses of large-format split-face concrete masonry units were set with consistent mortar joints throughout, finished with a solid cap course running the full wall length. The split-face texture presents a clean, professional gray masonry face to the street — appropriate for the commercial corridor's visual standard and built to withstand Long Island's freeze-thaw cycles without joint movement or surface deterioration.
The sidewalk interface was restored cleanly at project close — no disruption to the adjacent public walkway, finished elevation matched exactly to the existing concrete sidewalk grade.
WHY FIORINI PAVING
The Retaining Wall Contractor Long Island Properties Trust
35+
Years on Long Island
Building and repairing retaining walls across Long Island since the late 1980s. We know what Suffolk County soil conditions, grade changes, and Long Island winters do to walls that weren't built correctly the first time.
275+
Retaining Walls Built & Repaired
275-plus retaining walls installed and repaired across Long Island — concrete block, poured concrete, natural stone, and masonry walls for residential, commercial, and municipal properties across Suffolk County and Nassau County.
1,500+
Properties Served Across Long Island
From commercial parking lots and industrial facilities to HOA communities and substantial residential properties — 1,500-plus Long Island properties served with our own crews and our own equipment since the late 1980s.
WHAT OUR CLIENTS SAY
4.6 out of 5 Google Reviews
Based on 10 Google reviews · Verified through Google Business Profile
Nick Russo
President, O'Keefe Court Condominium Board
2024
Fiorini Paving did an excellent job repaving the parking lot at our condo facility. As president of the board, I was involved in reviewing multiple proposals, and Fiorini impressed us with their professionalism, responsiveness, and attention to detail from start to finish. The quality of the work was top notch, and they followed up after completion to ensure everything was holding up well. We're very satisfied with the results and would highly recommend Fiorini Paving for any paving or asphalt work.
Verified Google Review
Valerie McDermott
Car Dealership, Long Island, NY
September 2021
Verified Google Review
We are a car dealership, it is a huge challenge to navigate a paving project with all the vehicles on site. Not for these guys. ABSOLUTELY A++. They were excellent at communicating exactly what needed to be done in order for the entire project to go smoothly. The parking lot looks amazing and our drain issues solved!
Matthew Vitiello
Long Island, NY
March 2021
The guys at Fiorini Paving really did a phenomenal job for us. Not only did the quality of work exceed our expectations but they were also very easy to work with throughout the whole process. I highly recommend them.
Verified Google Review
AE Ealy
Local Guide · Long Island, NY
2024
Verified Google Review
Great price. They did a very good job. The crew was very professional. Everyone was respectful. They quoted a price, gave a deadline date to complete the job and came through. Highly recommend them.
COMMON QUESTIONS
Retaining Wall Questions, Straight Answers
Yes — many retaining walls in Suffolk County require a building permit, especially walls over four feet tall. Local codes vary by town, so it depends on where your property sits. We handle the permit process as part of every retaining wall project. Getting this right from the start protects you from fines and makes sure the wall is built to code. An unpermitted wall can also become a title issue if you sell the property.
Those areas have sharp grade changes between properties, which puts constant pressure on soil over time. Erosion and shifting soil are common problems on sloped lots across Suffolk County. A retaining wall stops that movement before it damages your driveway, walkway, or foundation — and turns a sloped yard into flat, usable space.
We work with concrete block, natural stone, and poured concrete. The right material depends on your property, the height of the wall, the load it needs to hold, drainage requirements, and the aesthetic of the property. We assess your specific site before recommending anything — what works in one yard may not be right for another.
In most cases, just the apron can be replaced. We do it regularly for older properties where the apron has heaved or separated from the blacktop. Sometimes a full driveway replacement makes more sense depending on the overall condition. We walk your property and give you a straight answer — no pressure either way.
Hydrostatic pressure — the weight of water-saturated soil pushing from behind the wall — is one of the leading causes of retaining wall failure on Long Island. Without proper drainage behind the wall, water builds up, freezes in winter, and pushes against the structure every season. Every wall we build includes a drainage plan — gravel backfill, weep holes, or a perforated drain pipe — based on soil conditions and wall height.
It depends on how far the failure has progressed. Early-stage leaning with intact drainage can sometimes be corrected with reinforcement and drainage repair. A wall that has moved significantly or lost its footing typically needs partial or full reconstruction. We assess the wall before recommending anything — sometimes a repair is the right call, sometimes rebuilding from the footing is the only fix that lasts.
Yes — retaining walls for commercial properties, HOA communities, and municipal sites are a significant part of our work. Commercial and municipal walls often require engineered drawings and stricter code compliance than residential walls. We hold the licenses, the insurance, and the permit experience to handle commercial and municipal retaining wall projects across Long Island.
READY TO GET STARTED?
Get a Free Retaining Wall Estimate in Suffolk County
Call us directly or submit an estimate request and we'll get back to you within one business day. We handle retaining wall installation and repair for residential, HOA, commercial, and municipal properties across Suffolk County and Nassau County.
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