How Much Does It Cost to Waterproof a Basement

Friday, December 27th, 2019


So you have a damp basement that’s causing all kinds of problems. You realize the indoor air is filled with musty odors, you’re coughing a lot, and the floor and walls feel colder than usual. The only recourse you have is to waterproof it. And this will cost you money, but how much?

Let’s look at how much interior basement waterproofing and exterior proofing will cost you so you can budget for your project.

Interior waterproofing costs

The first step in protecting your basement is waterproofing the interior. It’s a process that involves many things. Let’s look at them and their respective costs:

  • Epoxy injection: If there are hairline foundation cracks in your walls or floor, you will have to fill it up with epoxy before you can proof the basement. This will stop water from leaking through the cracks. Curing takes about five hours. A skilled waterproofing technician will charge between $350 and $500 per crack repair.
  • Sump pump installation: It’s recommended that you install a sump pump to remove water that gets through the wall during flooding. A brand new sump will be upwards of $1,000 if installed. Plumbers may charge upwards of $100-180 per hour to set it up, translating to at least $800-1,200 for eight hours of work. Though costly, it will go a long way to protect your home from water damage.
  • Waterproof concrete sealants: You’ll need to apply this to protect your surfaces from water damage as well. Bituminous sealants cost $10-$80 per bucket, while polyurethane costs $10-$100. Silicone is another option and this goes for $10-$220.
  • Crawl space vapor barrier: Sealing and proofing the crawl space from water will cost you anywhere between $2,000 and $10k. The cost will depend on the size and condition of your crawl space, the number of layers, and the type of crawl space insulation you will use.
  • Interior French drains: It's a good way of preventing flooding as it channels water away from the foundation. Installing 50-ft French drain costs roughly $1,000 at $50-60 per linear foot.

  • Basement waterproofing paint: A quart goes for $10 while a gallon goes for $39 or thereabouts. A gallon is enough to paint 70-120 square feet. This is in no way a permanent solution. You’ll just have to spend more money on a product that is only temporary.
  • Minor repairs: Improvements and repairs to the interior will cost you at least $2,000.

Note: Prices are just ranges and not the eventual cost. Talk to your contractor to get a free and fair estimate after an inspection.

Exterior waterproofing costs

If you live in an area with poor soil conditions or flooding problems, you’ll have to waterproof the exterior of your basement to ensure no water gets inside. The best time to do this is when you’re building your home. Some of the costs you will incur in the process include:

  • Excavation: It’s commonly used when the contractor can’t access the completed concrete basement walls from the inside. Good examples are wet bars, fireplaces, and leaks behind paneling. Once done, you can waterproof the entire wall or sections of it. Depending on depth and ease of access, you’re likely to pay $100 to $200 per linear foot. Excavation works can take 24 hours.
  • Water damage repairs: Your Columbus, OH, basement must be in a condition for waterproofing to be effective. To remove standing water or repair any damage to your basement, set aside $500 to $2,000 for the work.
  • Sodium bentonite treatment: This is a clay-like substance that creates a barrier between the wet soil and your foundation. When water molecules come in contact with sodium bentonite, it expands and fills up the crack, preventing water from seeping through. On average, it costs $5 per ton.
  • Exterior French drains: They’re a useful and inexpensive way of keeping water away from your structure. Exterior drains cost $10-$15 per linear feet.
  • Window well drain: Installing a well drain around a window is a cost-effective way of preventing water from entering your basement and causing damage. Set aside $500-$1,500 for this activity.
  • Foundation membrane: Though more costly than a cementitious coating, it’s useful in stopping leaks as it has no seams between panels. Liquid waterproofing membrane costs $3-$5 per square foot, while the sheet membrane costs $3.50 to $6.50 per square foot. Be sure your contractor backfills it with at least six inches of soil after installation.

What’s the cost of labor?

Some Columbus, OH, contractors will charge you a fixed amount for the entire project, while others per linear foot. A 1,000 square foot basement will cost roughly $5,000 to waterproof, or $5 per foot. This amount covers the cost of labor and materials, including cleaning gutters, minor repairs, epoxy injection, sump pump installation and creating French drains. Nearly every waterproofing contractor will back their work with a warranty. Typical warranties for waterproofing projects could run for 10 years to 25 years.

Want to waterproof your basement? Contact your local basement contractor to get free estimates for your project.

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