Dealing with a wet basement in Long Island isn’t just about mopping up water—it’s about protecting your home’s foundation from serious structural damage. Between the region’s high water table, nor’easters, and aging drainage systems, basement issues can escalate quickly. Homeowners often face tough decisions: Should you attempt DIY repairs or hire professionals? How do you know if a contractor will actually solve the problem rather than apply temporary fixes? And with so many companies claiming expertise, how do you identify one that understands Long Island’s specific moisture challenges?
The good news is that several companies in the area offer comprehensive solutions backed by proper licensing, proven systems, and long-term warranties.
Here’s how the top options compare.
What Are Buyers Concerned About With Long Island Basement Repair Companies?
- French drain systems clog from debris or silt buildup, leading to water pooling around foundations and eventual basement flooding or bowing walls.
- Sump pump failures from poor maintenance, incorrect installation, or power outages leave basements vulnerable to rapid water accumulation.
- Long Island’s naturally high water table creating continuous moisture issues that require specialized knowledge and permanent solutions rather than surface-level fixes.
- The challenge is finding a reliable contractor who can accurately diagnose problems, provide trustworthy repair recommendations, and deliver fair pricing without hidden costs.
- Foundation settlement is causing drainage slope changes that result in poor water flow, basement wall cracks, and recurring flooding issues.
TL;DR Long Island Basement Repair Companies at a Glance
| Company | Best for | Key Advantage |
| Premium Technical Services | Residential and commercial properties requiring comprehensive foundation and waterproofing solutions | Family-owned operation offering basement waterproofing, foundation repair, crawl space encapsulation, and commercial engineering services across Nassau and Suffolk Counties |
| E&M Basement Waterproofing | Properties needing customized drainage and moisture control systems | Family-operated since 1979, with over 25,000 customers served and a 10-year workmanship guarantee on all installations |
| Boccia Inc. | Properties requiring both waterproofing and masonry restoration services | 70 years in business with in-house crews, a lifetime basement warranty, and an affiliated engineering firm for structural evaluations |
| ACM Basement Waterproofing | Homeowners seeking direct owner involvement and property-specific solutions | Local non-franchise company with owner Mark McAlpin personally involved in inspections and a Basement Health Association Star Award recipient |
| A.M. Shield Waterproofing Corp | Properties with complex hydrostatic pressure and drainage challenges | Certified Waterproofing Specialists with detailed inspection protocols and customized proposals based on Long Island’s environmental conditions |
1) Premium Technical Services – Comprehensive Foundation and Waterproofing Solutions Across Residential and Commercial Properties
Premium Technical Services operates as a family-owned business serving Long Island through three unified brands: Premium Technical Services for commercial and engineering projects, Complete Basement Systems for residential work, and Premium Foundation Supply for contractor distribution. Based in Massapequa, the company provides foundation repair, basement waterproofing, crawl space services, and advanced commercial solutions, including underpinning, slab jacking, and helical pile installations across Nassau County, Suffolk County, and Greater New York City.
The company addresses both residential moisture control needs and complex commercial structural challenges. Their residential services through Complete Basement Systems include basement waterproofing, crawl space encapsulation, drainage systems, sump pumps, dehumidifiers, and foundation crack repair using epoxy injection, urethane injection, and carbon fiber reinforcement methods. For commercial clients, Premium Technical Services delivers engineering-driven solutions such as permeation grouting, structural engineering support, and helical pile systems designed for large-scale projects requiring professional oversight.
Key Highlights:
- Licensed and insured operations across Nassau County, Suffolk County, and Greater New York City with established service coverage throughout Long Island.
- Comprehensive service range spanning residential waterproofing, foundation stabilization, crawl space repair, and commercial engineering solutions under one organizational structure.
- Multiple crack repair methods, including epoxy injection, urethane injection, and carbon fiber reinforcement, for addressing various foundation conditions.
- Distribution services through Premium Foundation Supply support contractors with helical piles, anchoring products, certified installer training, and contractor partnership programs.
Why Choose Premium Technical Services:
Premium Technical Services stands out as the most comprehensive option on this list due to its ability to handle everything from residential basement waterproofing to complex commercial foundation projects requiring engineering coordination. The unified brand structure means homeowners can access the same professional-grade systems and expertise used in commercial applications, while contractors benefit from distribution services and certified training programs that ensure proper installation standards across the region.
Customer Experience:
“Had an excellent experience with Premium. They were responsive and professional throughout the entire project. I highly recommend” – Daniel Schilling (Google Reviews)
2) E&M Basement Waterproofing – Family-Operated Waterproofing Solutions Since 1979
E&M Basement Waterproofing is a family-owned company established in 1979 by Ed Mihelic and Maria, serving residential and commercial properties across Nassau County, Suffolk County, Queens, Brooklyn, Manhattan, and throughout Long Island. The company has served over 25,000 customers and provides basement waterproofing, foundation waterproofing, French drain installation, sump pumps, crawl space encapsulation, egress window installation, and drainage systems. Ed Mihelic continues to oversee field operations and customer evaluations while Maria manages administrative operations, maintaining hands-on family involvement throughout project planning and installation.
The company is fully licensed and insured in Nassau County, Suffolk County, and New York City. E&M Basement Waterproofing uses VOLTEX waterproofing material for exterior foundation applications, installs Zoeller sump pumps with battery backup systems, and provides AprilAire dehumidifiers designed for heavy moisture conditions. All waterproofing installations are fully guaranteed for 10 years, including French drains, dry wells, egress window installations, and foundation waterproofing services.
Key Highlights:
- Over 25,000 customers served since 1979, with three generations of family involvement in waterproofing operations.
- 10-year workmanship guarantee covering French drain systems, foundation waterproofing, sump pump installations, drainage systems, and crawl space solutions.
- VOLTEX waterproofing system is certified under NSF Standard 61 for potable water use, designed to provide waterproofing protection for the life of the structure.
- Hand-digging methods are used for installations to reduce disruption to landscaping and surrounding property areas.
- Code-compliant egress window systems with integrated drainage protection and 10-year warranty coverage against water penetration.
Considerations before going with E&M Basement Waterproofing:
Exterior excavation and waterproofing solutions may not always be feasible depending on site conditions, surrounding structures, or accessibility limitations. Certain situations may require combinations of drainage, waterproofing, and moisture control systems to properly address basement water intrusion issues.
3) Boccia Inc. – Multi-Generational Waterproofing and Masonry Expertise Since 1955
Boccia Inc. is a waterproofing and masonry company serving Nassau County, Suffolk County, and Queens since 1955. Founded by Rizziero (Ray) Boccia, the company has operated through four generations of the Boccia family and completed thousands of projects throughout Long Island and Queens. The company performs all work using in-house crews without subcontracting and provides residential and commercial services, including basement waterproofing, foundation repairs, masonry restoration, facade waterproofing, parking garage waterproofing, and commercial roof repair.
The company is licensed and insured and operates as a New York State Licensed Mold Abatement Contractor and Certified EIFS Industry Professional. Boccia Inc. introduced its patented Hollow Kick Molding Drainage System in 1986 for basement waterproofing applications. Through its affiliated engineering firm, Engineered Building Inspections, P.C. (EBI), established in 1995 by Vincent Boccia, P.E., the company provides professional engineering services including structural evaluations, parking garage condition assessments, facade investigations, and corrective building solutions.
Key Highlights:
- 70 years of continuous operation with four generations of family involvement and thousands of completed projects across Long Island.
- In-house crews perform all waterproofing, masonry, restoration, and structural repair work without subcontracting to outside contractors.
- Lifetime basement warranty for waterproofing systems designed for long-term performance and protection against water intrusion.
- Patented Hollow Kick Molding Drainage System developed specifically for basement waterproofing applications.
- Affiliated professional engineering firm providing structural evaluations, construction drawings, and corrective solutions for complex building defects.
Considerations before going with Boccia Inc.:
Business hours are limited to Monday through Friday, 9 AM to 5 PM, with no weekend availability. Projects requiring immediate weekend attention or consultations outside standard business hours may experience scheduling delays.
4) ACM Basement Waterproofing – Local Non-Franchise Company with Direct Owner Involvement
ACM Basement Waterproofing is a family-owned Long Island company serving Nassau County and Suffolk County since 1991, along with select surrounding areas including Brooklyn and the Bronx. The company operates as a local business rather than a franchise and specializes in basement waterproofing, crawl space waterproofing, and foundation repair for properties affected by water intrusion, moisture buildup, and structural foundation issues. Owner Mark McAlpin is personally involved in inspections, recommendations, and estimates, providing direct customer interaction and property-specific repair solutions.
ACM is licensed in Nassau County and Suffolk County, and states it has never had a complaint with consumer affairs in either county. The company is insured for basement waterproofing, crawl space waterproofing, and foundation repair operations throughout Long Island. ACM is a member of the Basement Health Association (BHA) with Certified Waterproofing Specialists on staff and is one of only three companies in New York State to receive the Basement Health Association Star Award. The company holds a Better Business Bureau Rating of A+.
Key Highlights:
- Owner Mark McAlpin personally conducts inspections and provides recommendations rather than delegating to sales representatives.
- Basement Health Association Star Award recipient, one of only three companies in New York State to achieve this recognition.
- Licensed in Nassau County and Suffolk County with no consumer affairs complaints in either jurisdiction.
- Better Business Bureau A+ rating reflecting commitment to customer satisfaction and service standards.
- Local non-franchise operation focusing on long-term waterproofing and structural repair solutions rather than temporary surface-level fixes.
Considerations before going with ACM Basement Waterproofing:
Waterproofing and foundation repair system longevity varies based on groundwater conditions, drainage performance, soil movement, and moisture exposure. Sump pumps and battery backup systems may require periodic inspection and maintenance to maintain long-term operation.
5) A.M. Shield Waterproofing Corp – Certified Specialists with Customized Waterproofing Solutions
A.M. Shield Waterproofing Corp is a locally owned waterproofing contractor serving Long Island, Queens, and Westchester since 1995. Operating from Albertson, New York, the company provides residential and commercial waterproofing services throughout Nassau County, Suffolk County, Queens, and Westchester. The company began with one truck and expanded into a full-service waterproofing contractor serving homeowners, builders, engineers, commercial property owners, management companies, and homeowners’ associations throughout New York.
A.M. Shield employs nationally Certified Waterproofing Specialists (C.W.S.) serving Long Island, NYC, and Westchester. The company’s staff maintains Certified Waterproofing Specialist (C.W.S.) certifications, Certified Environmental Specialist (CES) certifications, OSHA training certifications, and lead paint certifications. President Hugo C. D’Esposito CWS CES served on the board of directors for the Basement Health Association from 2002 through 2025 and served as Education Director for 10 years. General Manager Jonathan Sorscher CWS CES joined the company in 2004 and oversees company operations and waterproofing services.
Key Highlights:
- Nationally Certified Waterproofing Specialists with ongoing industry education and technical training in waterproofing systems, mold remediation, and drainage solutions.
- Leadership involvement in Basement Health Association, including 10 years as Education Director and board service through 2025.
- Comprehensive waterproofing systems, including Tegra-Tite 500, bentonite systems, HDPE composite systems, Aquafin products, and Geo-Wrap drainage systems.
- Detailed property evaluations assessing foundations, drainage systems, grading conditions, hydrostatic pressure, soil conditions, and groundwater behavior.
- Both in-store and virtual consultation options with financing available for waterproofing and foundation repair projects.
Considerations before going with A.M. Shield Waterproofing Corp:
Business hours are Monday through Friday, 9 AM to 5 PM, with no weekend availability. Saturday and Sunday are closed, which may limit scheduling flexibility for homeowners requiring weekend consultations or inspections.
The Verdict: Which Basement Repair Company Should You Choose? (Our Top 3 Picks)
After evaluating service offerings, certifications, warranties, and customer support across Long Island’s basement repair companies, three providers stand out for different homeowner needs.
Premium Technical Services offers one of the most comprehensive service ranges for residential and commercial properties. Through its connected brands, homeowners can access basement waterproofing, foundation repair, drainage solutions, and engineering-backed support, making it a strong option for projects that require more advanced structural expertise.
E&M Basement Waterproofing is a great choice for homeowners who value experience and long-term reliability. Having served thousands of customers since 1979, the company combines family ownership with a 10-year workmanship guarantee and a proven track record in waterproofing and drainage solutions.
Boccia Inc. stands out for homes that may need both waterproofing and masonry restoration. With decades of experience, in-house crews, and a lifetime basement warranty, the company is well-suited for older properties that require a broader range of repair services.
The best choice depends on your property’s specific needs. Consider factors such as project complexity, warranty coverage, engineering support requirements, and the type of moisture or foundation issues you need addressed before making your decision.
