Cost guide · Updated October 2026
How Much Does Basement Waterproofing Cost?
Interior waterproofing is usually less expensive than exterior work because it skips excavation.
Typical range
$2,461–$8,202National average
$5,241Source: Angi, accessed October 2026. Actual prices depend on your home, materials and location.
Get a real quote for your home
National averages are a starting point. A local waterproofing pro can price your exact project for free.
Common prices
| Item | Typical cost |
|---|---|
| Interior sealant or coating | $1–$8 per sq. ft. |
| Interior drainage system | $25–$55 per sq. ft. |
| Sump pump | $1,200–$2,500 |
| Crack injection | $800–$1,500 per crack |
| Permits | $150–$500 |
What affects the price
- Interior or exterior. Exterior waterproofing requires digging and costs more.
- Basement size. Larger basements need longer drainage runs and more material.
- Source of water. Fixing gutters and grading can reduce how much waterproofing you need.
- Existing damage. Mold or water damage repair adds to the total.
How to get an accurate quote
- Get at least three quotes. Prices for the same job often vary a lot between contractors.
- Compare the same scope. Make sure each quote covers the same materials, removal, permits and cleanup.
- Check license and insurance. Ask for proof of insurance and look up the contractor's license with your state.
- Get it in writing. A written estimate should list the work, the price, the payment schedule and the warranty.
Get a real quote for your home
National averages are a starting point. A local waterproofing pro can price your exact project for free.
Sources
- Angi cost guide, accessed October 2026
Prices are national figures published by the sources above and are for general information only. They are not a quote or an offer from FixFinch or any contractor.