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)
| Tier | Cost | Unit |
|---|---|---|
| Low | $2,500 | per job |
| Typical | $6,500 | per job |
| High | $18,000 | per job |