Hear from Our Customers
You shouldn’t have to check your basement every time it rains. You shouldn’t smell that musty odor when you walk downstairs. And you definitely shouldn’t be mopping up water or worrying about what’s growing behind your walls.
A dry basement means you can actually use that space. Store what matters without ruining it. Breathe cleaner air. Sleep through storms without wondering if you’ll wake up to a mess.
It also means protecting your home’s value. Water damage doesn’t just cost you now—it shows up during inspections, scares off buyers, and eats into your equity. Fixing it right the first time stops that cycle and gives you one less thing to lose sleep over.
Del Val Basement Waterproofing is a family-run waterproofing contractor serving Upper Uwchlan, PA and the surrounding Chester County area for over 15 years. We know this region—the soil composition, the drainage challenges, the way older homes were built before modern waterproofing standards existed.
We’re not a national franchise reading from a script. We’re local, and we’ve seen what works in Upper Uwchlan and what doesn’t. Our crews live here, our reputation is built here, and we stand behind every job with a lifetime transferable warranty.
You’ll get straight answers, fair pricing, and work that actually solves the problem instead of just covering it up temporarily.
First, we come out for a free inspection. We’re looking at where water’s getting in, how your foundation is holding up, what’s happening with drainage around your home, and whether your soil is creating pressure issues. You get honest answers about what needs to be fixed and what doesn’t.
Once you’re ready to move forward, we map out the work. For interior waterproofing, that usually means installing our sub-floor pressure relief system—a proven alternative to old French drains that actually handles Chester County’s clay soil and seasonal water pressure. We add sump pumps where needed and seal vulnerable areas. For exterior work, we excavate around the foundation, apply waterproof membranes, and install proper drainage systems that redirect water away from your home.
The job gets done without tearing apart your life. You can stay in your house. We keep the work area contained. And when we’re finished, your basement stays dry—even during the heaviest storms Upper Uwchlan throws at it.
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You’re getting systems designed specifically for Upper Uwchlan’s conditions. The clay-heavy soil here doesn’t drain like sand or loam—it holds water and creates hydrostatic pressure against your foundation. That’s why cookie-cutter solutions fail and why we use sub-floor pressure relief systems recommended by structural engineers.
You’re also getting both interior and exterior options. Interior waterproofing is more budget-friendly and less invasive—we handle it from inside without major excavation. Exterior waterproofing is more thorough, addressing the problem at the source with membranes and drainage systems that can last 20 to 30 years when installed correctly.
And you’re getting protection that covers more than just water. We handle mold remediation if it’s already started growing. We encapsulate crawl spaces to control moisture and improve air quality throughout your home. We repair foundation cracks before they turn into bigger structural issues. Every service connects back to the same goal: keeping your basement dry and your home protected for the long haul.
Most interior waterproofing projects in Upper Uwchlan run between $3,000 and $7,000, depending on your basement size and how much drainage work is needed. Exterior waterproofing costs more—usually $8,000 to $15,000—because it involves excavation, membrane installation, and exterior drainage systems.
The price depends on what’s actually wrong. If you just need a sump pump and some interior sealing, you’re on the lower end. If your foundation has multiple crack points, poor grading, and no existing drainage system, the scope grows.
We give you a free estimate after inspecting your home. No pressure, no upselling services you don’t need. Just an honest assessment of what it takes to keep your basement dry and what that costs in real numbers.
Interior systems with quality sump pumps and drainage typically last 20 to 25 years with basic maintenance. Exterior waterproofing can last 20 to 30 years or longer if it’s done right the first time with proper membranes and drainage.
The lifespan depends on installation quality and how well the system matches your home’s specific conditions. Cheap materials or shortcuts during installation mean you’re looking at problems within 5 to 10 years. That’s why we use proven systems and back our work with a lifetime transferable warranty.
Maintenance is minimal. Check your sump pump once or twice a year. Keep gutters clear so water doesn’t overwhelm your drainage system. That’s about it. The system does its job quietly in the background, and you don’t think about it until the next big storm rolls through and your basement stays bone dry.
Clay soil is the biggest culprit. Upper Uwchlan sits on clay-heavy ground that doesn’t absorb water quickly. When it rains, that water has nowhere to go, so it builds up around your foundation and pushes through cracks, seams, and weak points.
Older homes add to the problem. Many properties in this area were built before modern waterproofing standards existed. No exterior membranes, no proper drainage systems, no sump pumps—just a foundation sitting in soil that holds water like a sponge.
Grading issues make it worse. If your yard slopes toward your house instead of away from it, every rainstorm sends water straight to your foundation. Combine that with clogged gutters or downspouts that dump water right next to your basement walls, and you’ve got a recipe for flooding. Fixing it means addressing the water before it reaches your foundation and giving it a path to drain away safely.
Exterior waterproofing is more thorough because it stops water before it reaches your foundation. We excavate around the perimeter, apply waterproof membranes directly to your foundation walls, and install drainage systems that redirect water away from your home. It lasts longer and handles the problem at the source.
Interior waterproofing is less invasive and more affordable. We install drainage systems and sump pumps inside your basement to manage water that’s already made it through. It works well for most homes and doesn’t require tearing up your landscaping or driveway.
The right choice depends on your situation. If your foundation is in rough shape with multiple leaks and structural concerns, exterior waterproofing makes sense. If you’re dealing with occasional seepage or want a cost-effective solution that still works, interior waterproofing gets the job done. We’ll walk through both options during your free inspection and recommend what actually fits your home and budget.
Yes. Interior waterproofing doesn’t disrupt your daily routine much at all. We work in your basement, keep the mess contained, and you can go about your life upstairs. Most interior jobs take two to four days depending on the size and complexity.
Exterior waterproofing is louder and more involved because we’re excavating around your foundation, but you still don’t need to leave. There’s noise, equipment, and activity outside, but your living space stays intact. Exterior projects typically take one to two weeks depending on weather and how much of the perimeter needs work.
We communicate the schedule upfront so you know what to expect. You’ll know when crews arrive, how long each phase takes, and when we’ll be finished. No surprises, no dragging the job out longer than necessary.
It shouldn’t—and if it does, we come back and make it right. That’s what our lifetime transferable warranty covers. If the system fails because of our workmanship or materials, we fix it at no cost to you.
Most waterproofing failures happen because the system wasn’t designed for the home’s specific conditions or because shortcuts were taken during installation. We avoid that by using proven systems like our sub-floor pressure relief setup, which handles Chester County’s clay soil and seasonal water pressure better than outdated French drains.
The warranty transfers if you sell your home, which adds value and gives buyers confidence. It’s not a gimmick or a limited-time offer. It’s a real guarantee that we stand behind the work we do, and your basement stays dry for as long as you own the house.
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