How Much Does Basement Waterproofing Cost? A Straight Answer
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Most basement waterproofing companies won't give you a real number until they're standing in your basement. We'd rather be upfront.
If you've been searching for basement waterproofing pricing, you've probably noticed most contractors dodge the question — "it depends," "call for a quote," "every home is different." All of that is technically true, but it's also a way of avoiding the conversation. So here's a real answer, based on what we actually charge.
The Short Answer
For a typical single-family home getting a full-perimeter interior waterproofing system, expect to pay in the neighborhood of $75 per linear foot of foundation. A home with 120 linear feet of foundation — a common size for a single-family house — typically runs around $9,000 for a complete system.
Del-Val Basement Waterproofing is generally priced on the lower end compared to other basement waterproofing companies in the region, without cutting corners on the system itself.
What That Price Actually Includes
A lot of homeowners assume "waterproofing" means a bucket of sealant on the wall. A real system is a lot more involved than that, and knowing what's included helps explain the cost:
A trench dug along the interior footing, roughly 10 inches wide and going down to the bottom of the footing — about 14 to 16 inches off the wall
HDPE perforated drainage pipe laid in the trench, surrounded by clean stone
Mira Drain installed at the cove where the wall meets the floor, to catch water before it spreads across the basement floor
For block foundations, weep holes drilled into the lowest block cores, so water trapped inside the hollow blocks drains down into the system instead of seeping into the room
A 22-inch deep sump crock with a lid
A 1/2 HP sump pump on every full-perimeter job, discharging a minimum of 10 feet away from the foundation outside
That's the full system — not a patch job, not a partial fix. It's designed to handle water at its source and move it safely away from your home for good.
What Makes the Price Go Up or Down
Your specific cost depends on a few things:
Linear footage of foundation — a smaller home costs less, a larger one costs more, since pricing scales with the length of foundation being treated
Foundation type — block foundations with weep holes take more labor than poured concrete
Obstructions — finished basements, built-in stairs, or utilities running through the work area can add complexity
Partial vs. full perimeter — some homes only need waterproofing along one or two problem walls, not the entire foundation
Additional drainage needs — homes with severe grading or groundwater issues may need supplemental exterior drainage work
This is exactly why we don't publish a single flat price — a 60-linear-foot partial job and a 200-linear-foot full-perimeter job on a large home are very different projects. But a free inspection gets you an exact number in writing, not a guess.
What About Other Services?
Interior waterproofing is the most common request, but it's not the only fix for every basement. Crawl space waterproofing, exterior waterproofing, standalone sump pump replacement, and foundation crack repair are all priced differently based on the specific problem and scope of work. If you're not sure which one your home needs, that's exactly what the free inspection is for — we'll tell you honestly what's actually necessary, not just try to sell you the most expensive option.
Why the Cheapest Option Usually Costs More Later
It's tempting to go with whoever quotes the lowest number, but in basement waterproofing, the cheapest bid is often the most expensive mistake. A system without proper HDPE piping, without weep holes for block walls, or with an undersized sump pump might handle a light rain — and then fail completely during the next major storm, leaving you paying for the fix twice.
Get a Real Number for Your Home
Every Del-Val Basement Waterproofing system comes backed by a Lifetime Transferable Warranty, so the investment protects your home for as long as you own it — and transfers to the next owner if you sell. If you want an exact, written quote instead of a ballpark, schedule a free inspection and we'll walk your basement with you and explain exactly what it needs and why.