The Hunterdon Scoop / Hire

Waterproofing and foundation repair contractors in Hunterdon County

Old fieldstone foundations, high water tables along the Delaware and the Raritan tributaries, and basements that never got waterproofed right the first time. Here is the state registration that matters for this trade, how to check it yourself, and what a fair price looks like.

Skip to all 28 businesses filed under Masonry & Concrete in the county directory ↓

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What it costs

For New Jersey, basic interior waterproofing (drainage system, sump pump, vapor barrier) runs $2,500 to $5,000; a fuller interior system with drainage and a sump pump averages $5,000 to $12,000 (Brickface NJ pricing guide, 2026). Interior sealants and coatings for minor seepage run $500 to $1,500, and that is a temporary fix, not a cure. Straightforward foundation repair averages around $5,000, ranging $2,000 to $8,000; structural underpinning runs an average of $25,000 and can run to $50,000 (Angi, 2026). Permits alone run $150 to $500. Get the scope in writing before you compare numbers, because 'waterproofing' means different things to different companies.

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Before you sign anything

  1. Ask for the NJ Home Improvement Contractor number and check it yourself at newjersey.mylicense.com (use the Business Search). Registration is mandatory for any home improvement work over $500.
  2. If the sales rep tells you the foundation itself is failing, not just leaking, get a second opinion from a structural engineer before signing. A waterproofing company has an incentive to sell you the bigger job.
  3. Structural foundation repair (underpinning, wall replacement, major crack repair) generally needs a township permit and can require an engineer's drawing. A contractor who says otherwise, on a job that's clearly structural, is telling you something.
  4. Get the warranty in writing, including whether it's transferable if you sell the house, and whether it covers just the product or the labor too.
  5. Ask what happens to the water after their system collects it. A sump pump that just moves the problem to your neighbor's yard, or your own foundation footing, is a bad design.

Waterproofing contractors register as Home Improvement Contractors with the NJ Division of Consumer Affairs. Structural foundation work can also require a permit and an engineer’s stamp, which is a separate question from registration.

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The local picture

Much of the marketing in this trade comes from regional waterproofing chains with a sales-then-subcontract model rather than local crews. That is not automatically a problem, but it means the registration check and the written scope matter more than usual here.

Questions neighbors actually ask

Do waterproofing contractors need to be licensed in New Jersey?

They need to be registered as Home Improvement Contractors with the Division of Consumer Affairs, the same registration roofers and siding companies carry. It's a registration, not a trade exam, so an active status confirms insurance and identity on file, not skill. Verify the number yourself at newjersey.mylicense.com.

Do I need a permit for basement waterproofing or foundation repair?

Interior waterproofing (drain tile, sump pump, sealants) is usually treated as maintenance and often does not need a permit, but check with your township, because practice varies. Structural foundation repair, anything touching the footing, underpinning, or a failing wall, generally does need a permit and can require an engineer's stamp. If a contractor is proposing structural work and skipping the permit conversation, slow down.

Interior or exterior waterproofing, which one do I need?

Interior systems (drain tile along the inside perimeter, a sump pump) are cheaper and less disruptive, and they handle most seepage problems. Exterior excavation and membrane work costs more and tears up the yard, but it stops water before it reaches the wall at all, which matters more on a home with a finished basement or a wall that's actively bowing. A contractor who proposes exterior work without explaining why interior wouldn't do the job owes you that explanation.

Why do foundation repair quotes vary so much?

Because the diagnosis varies as much as the fix. A hairline crack sealed from the inside and a bowing wall that needs carbon fiber straps or full underpinning are different jobs by tens of thousands of dollars. Get an independent structural opinion on anything described as bowing, shifting, or settling before you commit to one company's repair plan.

28 businesses filed under Masonry & Concrete in the county directory, A–Z

Everything filed under Masonry & Concrete in the county directory, alphabetically. It is a broad category, so it takes in neighboring lines of work as well as waterproofing and foundation repair contractors. No ordering, no ranking, no picks.

Names, towns and numbers come from The Hunterdon Scoop business directory, pulled July 28, 2026. Want this list narrowed to your town? Browse Masonry & Concrete by town. A business appearing here is not a recommendation, and no business pays to be on it.

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