Hear from Our Customers
You stop cleaning up water every spring. You stop smelling that musty odor when you walk downstairs. You stop wondering if today’s the day mold starts growing behind your walls.
A waterproofed basement means you can actually use that space. Store things without worrying they’ll get ruined. Finish it without second-guessing whether moisture will wreck your investment. Sleep through storms without checking your phone for weather alerts.
Your home value stays protected too. Water issues can knock 25% off what a buyer’s willing to pay. A dry basement with a transferable warranty does the opposite—it’s one less thing they’ll try to negotiate down. You’re protecting what you’ve built, literally and financially.
Del Val Basement Waterproofing is a family-run company that’s spent over 15 years fixing basement water problems across Montgomery County. We know New Hanover’s soil—the clay that holds water and pushes against your foundation walls when it expands.
We’re not the biggest operation you’ll find. We’re the one that shows up, does the work right, and backs it with a lifetime transferable warranty. John Harte started our company because homeowners were getting overcharged for work that didn’t last. We do the opposite.
You’ll work with people who’ve seen hundreds of wet basements in this area. We know what works in New Hanover and what’s a waste of your money.
First, we come out and inspect your basement for free. We’re looking at where water’s getting in, what your foundation looks like, and how your property drains. We check for cracks, seepage patterns, and whether your existing drainage is doing anything useful.
Then we recommend either an interior or exterior approach—or both, depending on what your home needs. Interior systems work from inside your basement using our Sub Floor Pressure Relief System. It handles water before it becomes a problem you can see. Exterior waterproofing means excavating around your foundation, sealing your walls, and installing proper drainage. It’s more involved but it stops water at the source.
We explain what we’re doing and why. You’ll know what to expect during the work and what your basement should look like when we’re done. Most jobs take a few days. When we finish, you get a lifetime transferable warranty that covers the work for as long as you own the home—and follows the house if you sell.
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Every basement waterproofing job includes a full inspection of your foundation and drainage. We’re checking your walls, floors, and the grading around your home. If you’ve got cracks, we repair them properly before sealing anything.
For interior work, we install a Sub Floor Pressure Relief System that’s been recommended by structural engineers. It manages groundwater pressure before it forces its way through your floor or walls. We also install sump pumps where needed and make sure they’re connected to drainage that actually moves water away from your house.
Exterior basement waterproofing in New Hanover, PA means we excavate down to your footer, apply waterproof membrane to your foundation walls, and install a drainage system that redirects water before it touches your home. We also address grading issues that send water toward your foundation instead of away from it.
New Hanover’s clay soil is tough on foundations. It holds moisture, expands when wet, and puts constant pressure on basement walls. Our systems are built to handle that. You’re not getting a generic fix—you’re getting a basement waterproofing solution designed for the conditions your home actually faces.
Most homeowners in the area pay between $4,000 and $8,000 for a complete system. Interior waterproofing usually runs less than exterior work because there’s no excavation involved. If you need both interior and exterior, or if your foundation has significant damage, costs go up.
The price depends on how much linear footage we’re covering, whether you need a sump pump, and how severe your drainage issues are. A small basement with minor seepage costs less than a full-perimeter job with foundation repairs.
We give you a free inspection and a clear estimate before any work starts. No surprises, no upselling. And financing costs less per month than cleaning up floods twice a year—most people spend $1,200 every time their basement gets soaked.
Interior systems can last decades without needing maintenance if they’re installed correctly. Our Sub Floor Pressure Relief System is designed for the life of your home. Sump pumps should be checked periodically, but the drainage system itself doesn’t wear out.
Exterior waterproofing lasts even longer because you’re sealing the foundation from the outside. The membrane and drainage we install are built to handle New Hanover’s wet springs and clay soil for 30+ years.
That’s why we back our work with a lifetime transferable warranty. We’re not expecting callbacks. If something fails, we fix it. But the systems we install are built to outlast the problem.
It depends on where the water’s coming from and what your budget looks like. Interior waterproofing is faster and less expensive. It manages water that’s already trying to get in by redirecting it before it floods your basement. It works well for most homes and handles New Hanover’s high water table without tearing up your yard.
Exterior waterproofing stops water before it reaches your foundation. It’s the most thorough option, but it requires excavation and costs more. If your foundation walls are cracked or you’re dealing with serious structural issues, exterior work might be necessary.
Sometimes the best approach is both—seal the outside and add interior drainage as backup. We’ll tell you what your home actually needs after we inspect it. No point paying for exterior work if interior will keep you dry.
Waterproofing stops the moisture that mold needs to grow. If your basement stays dry, mold doesn’t have the conditions it needs to spread. That said, if you already have mold, waterproofing won’t remove it—you’ll need to clean or remediate the affected areas first.
Once we install a waterproofing system, your basement’s humidity drops. No more musty smell. No more damp walls. Mold needs consistent moisture to thrive, and a properly waterproofed basement doesn’t give it that.
About 38% of basements with moisture problems develop mold. That’s a health risk and a property value problem. Waterproofing eliminates the source, which is a lot more effective than cleaning mold off your walls every few months.
If you see water after it rains, that’s obvious. But there are earlier signs most people miss. Efflorescence—that white, chalky stuff on your concrete—means water’s moving through your walls. Musty odors mean moisture is present even if you don’t see standing water. Cracks in your foundation that are wider than a quarter or that leak when it rains need attention.
You might also notice your basement feels damp or humid even when it hasn’t rained. That’s groundwater pressure pushing moisture through your concrete. Paint peeling off walls, rusted metal, or warped wood are all signs that water’s getting in.
New Hanover’s clay soil makes this worse. The soil doesn’t drain well, so water sits against your foundation and eventually finds a way in. If you’re seeing any of these signs, a free inspection will tell you what’s happening and whether waterproofing will fix it.
Yes. Basement waterproofing typically returns about 30% ROI when you sell. More importantly, it prevents your home from losing value. Water damage and mold can drop your property value by up to 25%. Buyers either walk away or demand steep discounts when they see moisture issues.
A dry basement with a transferable lifetime warranty is a selling point. It’s one less thing a buyer has to worry about or negotiate over. In Pennsylvania, you’re required to disclose water issues on your Seller Property Disclosure Statement. If you’ve waterproofed, you’re disclosing a solution, not a problem.
Even if you’re not selling anytime soon, you’re protecting your investment. Water damage gets expensive fast—foundation repairs, mold remediation, replacing damaged belongings. Waterproofing costs less than fixing the damage water causes over time.
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