How much does foundation waterproofing cost?
Foundation waterproofing runs $2,500 for interior crack-and-coat sealing, $6,500 for a typical interior French drain with sump pump, and $18,000+ for full exterior excavation and membrane application.
Quick price points (2026)
| Scope | Cost | What it includes |
|---|---|---|
| Low | $2,500 | per job |
| Typical | $6,500 | per job |
| High | $18,000 | per job |
How to budget for this project
- Get 3 quotes
Get itemized quotes from at least three licensed contractors in your area.
- Adjust for your region
Compare the same scope and account for regional labor and permitting.
- Add 10–15% contingency
Hidden conditions, code upgrades and permit fees can increase the original quote.
- Plan the cash, not the financing
Build the replacement cost into the home's repair plan before the work becomes an emergency.