We Are the Leading Foundation Repair, Structural Repair and Basement Waterproofing Contractor in New Jersey and Eastern Pennsylvania
Serving homeowners throughout Morris, Monmouth, Middlesex, Mercer, Somerset, Hunterdon, Ocean, Bergen, Essex, Union counties in NJ, and Bucks and Montgomery counties in PA
Since 2006, we have been providing trusted, expert waterproofing and structural repair services—from French drains to parking decks and everything in between—as well as foundation repair, foundation replacement, structural repairs, masonry, and construction restoration. With over 2,000 satisfied customers, we’ve built an excellent reputation for delivering reliable, long-lasting solutions.
As a fully licensed, bonded and insured waterproofing and foundation repair contractor, we use the most effective methods trusted by both engineers and architects. At Down Under Waterproofing and Foundation Repair, we prioritize transparency and integrity—there are no high-pressure sales tactics. We offer honest advice, guide you through the process, and ensure the job is done right the first time.
Our goal is simple: to fix, not patch. Trust us to provide quality, lasting solutions. We’ve been there, we’ve done that—and we’re here to help. This is why we have been NJ's Trusted Waterproofing and Foundation Repair Experts since 2006.
Our Services
Professional French drain installation, sump pump systems, foundation crack repair, and basement moisture control services throughout New Jersey.
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).
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.
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.
Doors-Windows
Professional Bilco door and basement egress window installation in New Jersey, improving safety, accessibility, and home value.
Professional traditional stucco and EIFS (Exterior Insulation and Finish System) repair, installation, and replacement services throughout New Jersey.
Professional repair, full rebuilds, and new installations across New Jersey.
Professional masonry services in New Jersey including brick repair, repointing and tuckpointing, step construction and replacement, block work, and chimney brick restoration.
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Basement Waterproofing Service Areas
Down Under Waterproofing provides professional basement waterproofing and foundation repair services throughout New Jersey and Eastern Pennsylvania. We proudly serve homeowners and businesses in the following counties:
- Morris County, NJ
- Monmouth County, NJ
- Middlesex County, NJ
- Bergen County, NJ
- Essex County, NJ
- Union County, NJ
- Mercer County, NJ
- Somerset County, NJ
- Hunterdon County, NJ
- Ocean County, NJ
- Bucks County, PA
- Montgomery County, PA
Our services include interior and exterior waterproofing, French drain installation, sump pump systems, foundation crack repair, crawl space encapsulation, and structural foundation repair.
Contact us today for a free inspection and estimate. We are committed to protecting homes throughout Central and Northern New Jersey as well as Eastern Pennsylvania.