Waterproofing Company in New London, PA

Your Basement Stays Dry. Your Foundation Stays Sound.

We deliver proven waterproofing systems that stop water before it becomes a problem—backed by 15+ years of experience and a lifetime transferable warranty.
A paint roller is applying white primer or paint onto a bare concrete surface, creating wide, uneven strokes across the gray basement floor—ideal for PA basement waterproofing in Montgomery & Chester County.

Hear from Our Customers

A man in work overalls and blue gloves kneels on the floor and uses a caulking gun to seal the edge of a sliding glass door in a modern indoor space.

Residential Waterproofing Company New London, PA

What You Get When Water Stops Being a Problem

You stop worrying every time it rains. You stop checking the basement after every storm. You stop dealing with that musty smell that never quite goes away.

A dry basement means your family isn’t breathing mold spores. It means your foundation isn’t slowly cracking under hydrostatic pressure. It means you’re not losing storage space or avoiding an entire level of your home.

New London gets 40-50 inches of rain every year. The clay soil here holds water like a sponge, then pushes it straight against your foundation walls. Spring thaw is the worst—frozen ground can’t absorb snowmelt, so it all ends up in your basement.

When your waterproofing system works the way it should, you don’t think about water anymore. You use your basement. You sleep through storms. You protect what you’ve built.

Local Waterproofing Contractor New London, PA

We've Been Fixing Wet Basements Since 2009

We’re a family-run waterproofing company serving homeowners throughout New London, PA and the greater Delaware Valley. We’ve installed thousands of systems in homes just like yours—stone foundations, high water tables, clay soil, all of it.

We’re not the biggest company you’ll find. We’re the one that shows up when we say we will, explains what’s actually wrong, and gives you a fair price. No pressure. No runaround.

Every system we install comes with a lifetime transferable warranty. That’s not marketing—it’s how confident we are that our work holds up. You can stay in your home during the entire process. Most jobs wrap up in a few days.

A person in spiked shoes is spreading self-leveling epoxy resin on a concrete floor with a large squeegee tool, part of a PA basement waterproofing project in Montgomery & Chester County.

Basement Water Damage Repair Company Process

Here's What Happens From Call to Completion

You call or fill out the form. We schedule a free inspection—usually within a day or two. One of our inspectors comes out, looks at your basement, checks the grading outside, and figures out where the water’s coming from.

We explain what’s happening and why. Then we walk you through your options—interior waterproofing, exterior work, sump pump systems, foundation crack repair. We tell you what we’d do if it were our house.

Once you’re ready to move forward, we schedule the work. Most interior jobs take two to four days depending on the size of your basement. We install the system, test it, clean up, and walk you through how it works. Then we back it with our lifetime warranty and you’re done.

No surprises. No upselling once we’re on site. Just straightforward work that keeps your basement dry.

A person uses a long-handled paint roller to apply bright red paint onto a large cement surface, ideal for basement waterproofing in Montgomery & Chester County, PA, with part of the area already painted and part still unpainted.

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About Del Val Basements

Best Waterproofing Company for Basement Moisture Problems

What's Included When We Waterproof Your Basement

We specialize in Sub Floor Pressure Relief Systems—a more reliable alternative to old-school French drains. This system relieves hydrostatic pressure before it cracks your walls or pushes water through your floor. It’s designed to last as long as your house does.

We also handle sump pump installation and backup systems, foundation crack repair, crawl space waterproofing, and exterior drainage work when needed. Every job starts with an honest assessment from someone who knows Pennsylvania foundations.

New London’s soil and weather patterns create specific challenges. Homes here deal with seasonal flooding during spring thaw, clay soil expansion and contraction, and older stone foundations that weren’t built with modern waterproofing. We’ve seen it all, and we know how to fix it right the first time.

You’re not just getting a system installed. You’re getting a solution designed for your home, your soil, and your water problem—with a warranty that transfers if you sell.

A worker in a yellow shirt and gloves is kneeling while installing a waterproofing membrane on a flat roof—an approach similar to Basement Waterproofing Montgomery & Chester County, PA—unrolling black material along the base of a wall.

How much does basement waterproofing cost in New London, PA?

Most interior waterproofing projects in the New London area run between $3,000 and $6,000. That typically includes a Sub Floor Pressure Relief System, sump pump, and necessary drainage work.

Exterior waterproofing costs more—usually $8,000 to $15,000 or higher—because it involves excavation around your foundation. We only recommend exterior work when it’s actually necessary, not as a default upsell.

The final price depends on your basement size, how much water you’re dealing with, and what’s causing the problem. We give you a clear estimate after the inspection. No hidden fees. No surprises once we start.

Our Sub Floor Pressure Relief Systems are designed to last the lifetime of your home. The materials don’t degrade. The drainage channels don’t clog when installed correctly. The system works passively—there’s nothing to wear out.

Sump pumps typically last 7-10 years depending on how often they run. We recommend battery backup systems for homes that flood during storms when power goes out.

That’s why we back our work with a lifetime transferable warranty. We’re not installing something that needs to be replaced in a decade. You’re getting a permanent fix.

Yes, and interior waterproofing is usually the smarter option. It costs less, takes less time, and works just as well for most water problems.

Interior systems relieve the hydrostatic pressure that causes water intrusion. Instead of trying to stop water on the outside—which eventually fails—we manage it on the inside where we can control it. The water gets directed into a drainage system and pumped out before you ever see it.

Exterior waterproofing makes sense if you have foundation cracks that need sealing or serious grading issues. But for most wet basements in New London, interior systems solve the problem without tearing up your yard.

Yes, if the smell is caused by moisture and mold—which it usually is. Once your basement stays dry, mold stops growing. The smell goes away over time as the space dries out completely.

We’re not masking the problem with dehumidifiers or sealants. We’re eliminating the moisture that causes it. No water means no mold. No mold means no smell.

If you want to speed up the process, you can run a dehumidifier after the system is installed. But the waterproofing itself is what solves the root cause.

No. You can stay in your house the entire time. Interior waterproofing is non-invasive—we’re working in your basement, not tearing apart your living space.

There will be some noise from jackhammering and equipment, but it’s not constant. Most homeowners go about their normal routines while we work. We clean up at the end of each day.

The whole process usually takes two to four days depending on your basement size. Then we’re done, and you’ve got a dry basement for good.

It won’t, but if it somehow did, our lifetime transferable warranty covers it. We come back and fix whatever’s wrong at no cost to you.

We’ve been doing this for over 15 years. We’ve installed thousands of systems. We know what works and what doesn’t. That’s why we’re comfortable offering a warranty that lasts as long as you own your home—and transfers to the next owner if you sell.

You’re not taking a risk here. We are. And we’re fine with that because we know our systems hold up.

Other Services we provide in New London