Basement Waterproofing & Foundation Repair NJ

Serving Central New Jersey and Eastern Pennsylvania from Robbinsville, NJ

Down Under Waterproofing provides basement waterproofing, foundation repair, crawl space encapsulation, French drain installation, sump pump systems, and structural repair for homeowners throughout New Jersey and Eastern Pennsylvania.

Based in Robbinsville, NJ, we proudly serve Mercer, Monmouth, Middlesex, Somerset, Hunterdon, Morris, and Ocean counties, along with Bucks and Montgomery counties in Pennsylvania.

Since 2006, we have helped homeowners fix wet basements, foundation problems, drainage issues, and crawl space moisture using reliable, long-term repair solutions tailored to local soil conditions and weather.

Reliability

Down Under Waterproofing & Foundation Repair has built a strong reputation for reliability, integrity, and consistently high-quality workmanship. We invite you to read our testimonials or request references to see why homeowners trust us throughout New Jersey.

On Time Performance

Down Under Waterproofing & Foundation Repair is committed to completing every project within the agreed-upon time frame and honoring scheduled appointments. We value your time and never leave customers waiting.

Latest Technology

Down Under Waterproofing & Foundation Repair utilizes the latest industry technologies to ensure every project is completed efficiently, reliably, and built to last.

Trusted Basement Waterproofing & Foundation Repair Since 2006

Down Under Waterproofing service truck and crew ready for a basement waterproofing job in New Jersey

Why Choose Us?

Down Under Waterproofing has helped over 2,000 homeowners solve basement water problems, foundation issues, and structural concerns throughout New Jersey and Eastern Pennsylvania.

Based in Robbinsville, NJ, we provide basement waterproofing, foundation repair, crawl space encapsulation, drainage solutions, and structural repair services designed specifically for local soil conditions and weather.

We are fully licensed, bonded, and insured, and we believe in fixing problems the right way the first time. Our team provides honest recommendations, clear communication, and long-term solutions without high-pressure sales tactics.

We proudly serve homeowners in Morris, Monmouth, Middlesex, Mercer, Somerset, Hunterdon, Ocean, Bergen, Essex, Union counties in NJ, and Bucks and Montgomery counties in PA

Our Location

Our Services

Wet and water-damaged concrete block basement walls in a New Jersey home

Basement Waterproofing

Professional French drain installation, sump pump systems, foundation crack repair, and basement moisture control services throughout New Jersey.

Stair-step cracks in exterior brick foundation wall indicating foundation settlement in NJ

Foundation/Structural Repair

Foundation repair services in New Jersey including bowing wall repair, failed footing stabilization, underpinning, brick and masonry repair, foundation wall replacement, historic foundation restoration, and basement dig-outs (floor lowering).

Construction Restoration

Structural repair services in New Jersey including sill plate replacement, floor leveling, termite damage repair, rotted wood replacement, and installation of support columns, beams, girders, and floor joists.

Contractor applying waterproof caulk sealant to above-grade concrete wall joint in New Jersey

Above Grade Waterproofing

Building envelope waterproofing services in New Jersey including commercial caulking, waterproof coatings, and flashing installation to protect against water intrusion.

Crawl Space Encapsulation

Unsealed dirt crawl spaces allow moisture, mold, mildew, and pests to thrive. Our crawl space encapsulation services in New Jersey create a clean, dry, and protected foundation environment.

Newly installed black Bilco basement cellar door in a New Jersey residential backyard

Doors-Windows

Professional Bilco door and basement egress window installation in New Jersey, improving safety, accessibility, and home value.

Two-story New Jersey home with professionally applied smooth stucco exterior finish

Trusted Basement Waterproofing & Foundation Repair in NJ

It is our commitment to serve as your Trusted Building Partner to deliver your project on time and on budget driven by Safety, Quality and a relentless pursuit toward Customer Satisfaction.

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