Basement Waterproofing Cost Calculator
Most basement waterproofing projects cost $3,000–$10,000. Enter your basement size and method to see an estimate for your home.
Last reviewed September 2026
- Linear feet treated
- 140 ft
- Price per foot
- $50–$100
Uses published installed prices per linear foot plus a new sump pump. Finished walls, concrete removal, access and local labor rates change the total. Most whole-basement projects cost $3,000–$10,000.
Basement waterproofing prices
| Job | Typical cost |
|---|---|
| Interior drain tile, per linear foot | $50–$100/ft |
| Exterior drain tile and membrane, per linear foot | $100–$200/ft |
| New sump pump installation | $500–$4,000 |
| Typical whole-basement project | $3,000–$10,000 |
Before you pay for waterproofing
Many wet basements are solved outside for far less: extending downspouts, regrading soil and clearing window wells. Use the basement leak finder to check the cause first, and get at least two quotes that list linear feet, sump pump, and any wall or floor restoration separately.
Basement waterproofing questions
How much does basement waterproofing cost?
Most basement waterproofing projects cost $3,000–$10,000, with many homeowners spending around $5,000. Interior drain tile typically costs $50–$100 per linear foot and exterior drain tile with excavation $100–$200 per linear foot.
Is interior or exterior waterproofing better?
Interior drainage manages water that reaches the wall and sends it to a sump pump; it's cheaper and can be done any time of year. Exterior waterproofing keeps water off the wall entirely but requires digging to the footing, so it costs more and disturbs landscaping.
Do I need a sump pump with interior drain tile?
Yes. Interior drain tile collects water and carries it to a sump pit, where the pump sends it outside. A battery backup is worth considering if your area loses power in storms.
Does waterproofing paint work?
Waterproof coatings can reduce dampness from minor moisture, but they don't stop water under pressure through cracks or the floor-wall joint. They're a supplement, not a fix for active leaks.