


Family-owned and operated since 2000, Complete Basement Systems (CBS) is proud to be Long Island’s longest-standing basement and crawl space repair company. For more than 25 years, we’ve helped homeowners protect their most valuable investment by preventing water and humidity damage. Our consultative approach sets us apart—we don’t just fix problems, we educate homeowners and deliver tailored solutions designed for lasting peace of mind.

Founded in 1984, PTS Foundation Supply (PTSFS) has been the Northeast’s go-to resource for helical piles, driven anchors, and installation equipment. From design to installation, we know how complex foundation projects can be. That’s why professionals across the region count on our 100+ years of collective experience to provide reliable products, expert insight, and a partnership that helps every project start—and finish—on solid ground.

Since 1973, Premium Technical Services (PTS) has been the Tri-State area’s trusted partner in foundation repair, below-grade waterproofing, and grouting. With more than 50 years of service and over 100 years of combined expertise on our team, we bring proven solutions to keep your foundation strong, dry, and secure for the long run.
Family-owned and operated since 2000, Complete Basement Systems (CBS) is proud to be Long Island’s longest-standing basement and crawl space repair company. For more than 25 years, we’ve helped homeowners protect their most valuable investment by preventing water and humidity damage. Our consultative approach sets us apart—we don’t just fix problems, we educate homeowners and deliver tailored solutions designed for lasting peace of mind.

Founded in 1984, PTS Foundation Supply (PTSFS) has been the Northeast’s go-to resource for helical piles, driven anchors, and installation equipment. From design to installation, we know how complex foundation projects can be. That’s why professionals across the region count on our 100+ years of collective experience to provide reliable products, expert insight, and a partnership that helps every project start—and finish—on solid ground.
Oyster Bay Foundation Repair and Basement Waterproofing
"*" indicates required fields
For more than two decades, Complete Basement Systems has helped families across Long Island protect their homes from below-ground threats. As a family-owned company operating since 2000, we bring over 25 years of hands-on experience to every project we take on.
Oyster Bay homeowners face unique challenges when it comes to keeping their basements dry and their foundations stable. The coastal climate, seasonal rainfall, and aging housing stock throughout the area can all contribute to water infiltration and structural cracks that put homes at risk. That's where our team comes in.
We specialize in Oyster Bay foundation repair and basement waterproofing, delivering solutions that address both immediate problems and long-term prevention. Whether your Oyster Bay home shows signs of moisture seeping through walls, a musty smell that won't go away, or visible cracks in the foundation, we have the tools and training to fix it right the first time.
Our services extend throughout the region, with basement waterproofing in Nassau County remaining one of our core specialties. When you need Oyster Bay foundation repair, you deserve a contractor who understands local soil conditions, building codes, and the particular stresses that Long Island weather places on residential structures. Complete Basement Systems has built its reputation on exactly that kind of localized expertise.
Ready to protect your home? Contact us today to schedule a free consultation and learn how we can help keep your basement dry and your foundation solid for years to come.
Why Foundation Repair Is Essential in Oyster Bay

Homes throughout Oyster Bay sit on soil that shifts and settles over time. From the historic neighborhoods near Raynham Hall to the waterfront properties along Oyster Bay Harbor, local geology and climate create conditions that put foundations under constant stress.
Several factors contribute to foundation problems in this region:
- Hydrostatic pressure from groundwater pushing against basement walls during wet seasons
- Seasonal freeze-thaw cycles that cause soil to expand and contract
- Sandy and clay-rich soils common to Long Island's North Shore that drain unevenly
- Aging construction materials in older homes that deteriorate over decades
When these forces go unchecked, the damage adds up. Foundation walls can bow inward, floors may become uneven, and doors or windows start sticking in their frames. A small crack completely ignored today can widen into a serious structural concern tomorrow.
The consequences extend beyond structural damage. Water intrusion issues create the perfect environment for mold growth, which affects indoor air quality and can trigger health problems for your family. That persistent musty smell in your basement often signals hidden moisture that needs professional attention.
Left unaddressed, foundation issues can decrease your property value and make your home difficult to sell. More importantly, severe settling or wall failure poses real safety risks to everyone living under your roof.
Complete Basement Systems takes a comprehensive approach to Oyster Bay foundation repair and basement waterproofing. We assess the root cause of the problem, not just the visible symptoms. Our solutions may include installing an exterior drainage system to redirect water away from your foundation, reinforcing weakened walls with proven stabilization methods, and sealing entry points where moisture finds its way inside.
Our Foundation Repair Services

Complete Basement Systems begins each project with a thorough inspection and honest conversation about your concerns. Our consultative approach ensures we recommend only the services your property actually needs.
Foundation Repair
From newer construction to historic homes found throughout Oyster Bay's established neighborhoods, we address the full range of structural concerns. Our team identifies what's causing the damage, whether it's soil movement, poor drainage, or years of heavy rain taking its toll, and implements targeted solutions that protect your investment.
Carbon Fiber Reinforcement
For bowing or cracking walls, carbon fiber straps provide remarkable strength without invasive excavation. This modern technique stabilizes foundation walls and prevents further movement, giving homeowners lasting security and peace of mind.
Crack Repair
We offer both epoxy injection for structural cracks and urethane injection for stops that are actively allowing water into your basement. Each method serves a specific purpose, and we'll explain which approach makes sense for your situation.
With Oyster Bay foundation repair and basement waterproofing services from CBS, you get solutions backed by 25 years of proven results.
Basement Waterproofing in Oyster Bay

Living near the Long Island Sound means dealing with elevated water tables and humidity levels that challenge even well-built homes. Seasonal storms deliver heavy rainfall that saturates the soil, and that moisture inevitably seeks a path through basement walls into your living space.
Oyster Bay basement waterproofing isn't optional in this climate. It's essential protection against water damage, mold, and the gradual weakening of your home's structure. A dry basement also means usable square footage and stronger resale value when it's time to sell.
Complete Basement Systems offers comprehensive basement waterproofing solutions designed for local conditions. Our services include interior drainage systems, sump pump installation, vapor barriers, and crawl space encapsulation for homes with below-grade spaces that trap moisture.
With Oyster Bay foundation repair and basement waterproofing expertise, we keep your basement dry year-round. Trust CBS for Oyster Bay foundation repair and basement waterproofing that delivers lasting results.
Our Basement Waterproofing Services

Complete Basement Systems delivers basement waterproofing Long Island homeowners can trust. Our team focuses on permanent solutions, not quick fixes that fail when the next storm hits. We inspect every property thoroughly before recommending a customized plan.
Basement Waterproofing
We use proven techniques for sealing basement walls and floors against water entry. Our process addresses the source of the problem, stopping moisture before it causes damage.
Crawl Space Repair & Encapsulation
Unsealed crawl spaces let ground moisture rise into your home. Encapsulation creates a complete vapor barrier that protects your floor system and improves indoor air quality.
Sump Pumps
A reliable sump pump removes water that collects beneath your basement before flooding occurs. We install battery backup systems so you're never caught waiting during a power outage.
Dehumidifiers
Controlling humidity prevents mold and protects building material from decay. Our commercial-grade units handle the demands of below-grade spaces.
Drainage Systems & Window Wells
Proper drainage channels water away from your foundation. We address soil grading, interior drains, and window wells to ensure complete protection.
Schedule your inspection today to learn the cost of Oyster Bay foundation repair and basement waterproofing for your home.
The Benefits of Working With Complete Basement Systems
When you choose CBS for Oyster Bay foundation repair and basement waterproofing, you're partnering with Long Island's most experienced basement and crawl space repair company. Here's what sets us apart:
- Consultative approach: We educate homeowners about their options rather than pushing unnecessary services. Your house gets exactly what it needs.
- 25+ years of expertise: Since 2000, we've solved foundation problems across Nassau and Suffolk counties. We've seen it all.
- Local knowledge: We understand how clogged gutters, North Shore soil conditions, and coastal weather patterns affect Oyster Bay homes.
- Comprehensive solutions: From mold remediation to exterior excavation, we handle every aspect of basement and foundation care.
- Proven reputation: With 50+ five-star Google reviews, our results speak for themselves.
- Family values: As a family-owned business, we treat every customer's home like our own.
For Long Island basement waterproofing and Oyster Bay foundation repair and basement waterproofing you can count on, trust the team that's been protecting local homes for over two decades.
Oyster Bay Foundation Repair and Basement Waterproofing FAQs
What Are the Signs That My Foundation Needs Repair?
Look out for cracks in walls or concrete floors, doors and windows that stick, uneven floors, and gaps between walls and ceilings. Water stains and bowing basement walls also signal trouble. If you notice these concerns, schedule an inspection before minor issues become major problems.
How Do I Know If My Basement Is at Risk of Flooding?
Several warning signs indicate flood risk: previous water stains, musty odors, condensation on pipes, efflorescence on walls, or visible cracks. Homes near Oyster Bay Harbor or in low-lying areas face a higher risk. Poor drainage and aging waterproofing systems also create vulnerability during heavy storms.
What Is the Cost of Foundation Repair and Basement Waterproofing in Oyster Bay?
Every home is different, so costs vary based on the scope of damage and solutions required. Oyster Bay foundation repair and basement waterproofing projects depend on factors like home size, problem severity, and chosen methods. Contact CBS for a free inspection and detailed estimate.
How Long Does Basement Waterproofing Last?
Professional basement waterproofing typically leads to decades of protection when properly installed and maintained. Quality interior drainage systems and sump pumps can last 25 years or more. CBS uses durable materials and proven techniques that deliver long term results for Oyster Bay homeowners.
What Are the Long-Term Benefits of Foundation Repair?
Foundation repair protects your home's structural integrity, prevents costly future damage, and maintains property value. Addressing problems early stops water intrusion, reduces mold risk, and provides peace of mind. Oyster Bay foundation repair and basement waterproofing from CBS keeps your home safe for generations.
Get in Touch With Complete Basement Systems Today
Don't wait until small problems become expensive repairs. Whether you're dealing with a damp basement or cracked foundation, Complete Basement Systems is ready to help with basement waterproofing Oyster Bay homeowners can count on.
Schedule your free inspection and discover why Oyster Bay homeowners have trusted CBS for over 25 years. Contact us today for Oyster Bay foundation repair and basement waterproofing solutions that last.
Call us at (516) 409-6000 or fill out our online form to request your free consultation.



