Basement Waterproofing Cost Calculator
Last updated: October 15, 2026
Estimate a basement-waterproofing project cost from perimeter drainage, sump pumps, wall sealing, exterior work, permits and contingency.
Starting figures illustrate this model. Enter your own measurements, quoted costs and applicable terms; this page does not retrieve live prices or provider rates.
Estimated basement-waterproofing cost
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- Interior drainage and sump pumps: —
- Wall sealing: —
- Exterior work and permits: —
- Contingency: —
On this page
Quick summary: Estimate a basement-waterproofing project cost from perimeter drainage, sump pumps, wall sealing, exterior work, permits and contingency.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Estimate a basement-waterproofing project cost from perimeter drainage, sump pumps, wall sealing, exterior work, permits and contingency.
How to use it
Enter Interior drainage perimeter (linear ft); Drainage system per linear ft ($); Sump pumps; Installed cost per sump pump ($); Wall sealing area (sq ft); Wall sealing per sq ft ($); Exterior excavation and grading ($); Permits and electrical work ($); Contingency (%). Select Calculate to update the results.
How the calculation works
The calculator totals perimeter drainage and pumps, area-based wall sealing, exterior work and permits, then adds contingency.
Worked example: starting scenario
| Interior drainage perimeter (linear ft) | 120 |
|---|---|
| Drainage system per linear ft ($) | 90 |
| Sump pumps | 2 |
| Installed cost per sump pump ($) | 1500 |
| Wall sealing area (sq ft) | 800 |
| Wall sealing per sq ft ($) | 4 |
| Exterior excavation and grading ($) | 0 |
| Permits and electrical work ($) | 300 |
| Contingency (%) | 10 |
| Estimated basement-waterproofing cost | $19,030.00 |
|---|---|
| Interior drainage and sump pumps | $13,800.00 |
| Wall sealing | $3,200.00 |
| Exterior work and permits | $300.00 |
| Contingency | $1,730.00 |
Important limitations
Water source, foundation type, access, excavation, mold, structural cracks, electrical work, drainage discharge and local labor affect actual bids.