Hear from Our Customers
Your basement becomes usable space again. Not just for a season, but year-round. You stop moving boxes to higher shelves before every storm and checking the floor with a flashlight at midnight.
The air in your home gets cleaner because mold stops growing in the dark corners you can’t see. Your family breathes easier. Your allergies calm down.
Your foundation stops taking damage from hydrostatic pressure. Cracks don’t spread. Walls don’t bow. The structure of your home stays intact, which means your property value does too. When you’re ready to sell, a dry basement with a transferable warranty is something buyers actually want to see.
Del Val Basement Waterproofing is a family-run waterproofing contractor serving Downingtown, PA and Chester County. We’re not a national franchise with rotating crews. We’re local, and we’ve seen what happens to basements in this area when the rain doesn’t stop.
Downingtown gets hit hard during storm season. The soil around here holds water, and when that pressure builds up against your foundation, it finds a way in. We’ve fixed hundreds of basements in this town, and we back every job with a lifetime transferable warranty.
First, we come out and inspect your basement for free. We’re looking for where the water’s coming in, what’s causing it, and how much damage has already happened. We don’t guess. We check your foundation, your grading, your drainage, and your interior floor.
Then we walk you through what needs to happen. If it’s an exterior issue, we excavate around your foundation, apply a waterproof membrane, and install proper drainage. If it’s interior, we install our Sub Floor Pressure Relief System, which handles hydrostatic pressure better than old French drains that fail over time.
Once the system’s in, we test it. You get a written warranty. And when the next storm rolls through Downingtown, your basement stays dry. That’s the part that matters.
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You get a full inspection and honest assessment. If your problem doesn’t require a full waterproofing system, we’ll tell you. If it does, we’ll explain exactly what we’re installing and why.
Our systems include interior drainage, sump pump installation, vapor barriers, foundation crack repair, and exterior waterproofing when needed. For homes in Downingtown dealing with crawl space moisture, we handle encapsulation and ventilation too.
Downingtown’s clay-heavy soil and frequent rainfall make basement moisture a recurring issue if it’s not handled right the first time. We use systems designed for this climate and this soil type. Every installation comes with our lifetime transferable warranty, which means if you sell your home, the new owner is covered too. That’s not standard in this industry, but it should be.
Most basement waterproofing projects in Downingtown run between $3,000 and $10,000, depending on the size of your basement, the severity of the water intrusion, and whether you need interior or exterior work. Exterior waterproofing costs more upfront because it involves excavation, but it lasts 20 to 30 years when done right.
Interior systems like our Sub Floor Pressure Relief System typically cost less and can be installed faster. If you’ve got foundation cracks, bowing walls, or structural issues, those repairs add to the total.
We give free estimates, and we don’t play pricing games. You’ll know what it costs before we start, and we don’t upsell you on things you don’t need.
Exterior waterproofing stops water before it reaches your foundation. We dig around the outside of your home, apply a waterproof membrane to the foundation walls, and install drainage systems to redirect water away. It’s the most thorough option and lasts decades.
Interior waterproofing manages water that’s already making its way inside. We install drainage channels along the perimeter of your basement floor, direct water to a sump pump, and pump it out. It’s less invasive, costs less, and works well for homes where exterior access is difficult.
In Downingtown, we often recommend interior systems because they handle the hydrostatic pressure that builds up in our soil during heavy rain. Both methods work. The right one depends on your home’s specific situation.
Most interior waterproofing systems take one to three days to install, depending on the size of your basement and the complexity of the job. Exterior waterproofing takes longer, usually three to five days, because we’re excavating around your foundation.
Weather can slow things down if we’re working outside, especially during Downingtown’s wet seasons. But once we start, we don’t leave your home open or unprotected overnight.
You’ll have access to your basement during the work, though it’ll be dusty and loud while we’re installing the system. Once we’re done, we clean up, test everything, and walk you through how it works.
Yes, but only if you also address the moisture that’s already there. Waterproofing stops new water from coming in, which eliminates the main source of mold growth. But if your basement is already damp or has visible mold, you’ll need to dry it out and possibly remove contaminated materials.
Mold grows in basements because moisture gets trapped. Once we install a waterproofing system and a sump pump, the humidity drops. Pair that with a dehumidifier, and your basement becomes an environment where mold can’t thrive.
In Downingtown, where basements stay damp for months after a wet spring, waterproofing is the only real solution. Bleach and fans don’t fix the problem. Stopping the water does.
If you’re seeing dampness, musty smells, efflorescence on your walls, or higher humidity downstairs, you’ve got a moisture problem even if you’re not seeing standing water. That moisture is doing damage. It’s weakening your foundation, feeding mold, and lowering your indoor air quality.
A lot of homeowners in Downingtown wait until they see water pooling on the floor. By then, the damage is worse and the repair costs are higher. Catching it early saves money.
If you’re planning to finish your basement or use it for storage, waterproofing first is the smart move. You don’t want to install drywall and carpet only to rip it out two years later because water started coming in.
Yes. A dry basement with a transferable warranty is a selling point. Buyers in Downingtown know that basements flood here, and they’re looking for homes where that problem has already been solved.
When you can show a potential buyer that your basement is professionally waterproofed and backed by a lifetime warranty, it removes a major concern. They’re not wondering if they’ll have to spend $8,000 fixing water damage after they move in.
Even if you’re not selling anytime soon, waterproofing protects your investment. Foundation damage and water intrusion lower your home’s value. Fixing it now keeps your property worth what it should be.
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