What it costs
Interior French drain runs about $40–$85 per linear foot, and a sump pump $600–$2,500 installed. A whole-basement interior system for 750–1,000 sq ft typically lands around $4,500–$10,000.
Source: HomeGuide: basement waterproofing cost; HomeGuide: sump pump installation cost. Price your basement with the cost estimator.
Worth knowing
- Fixes water at the floor-wall joint and under the slab
- Needs the bottom of the walls and the floor edge exposed
- Works from inside, any time of year
- Pair with a battery backup pump if power cuts are common
What to send contractors
- Where the water appears and how much
- Basement size and wall type
- Whether there is already a sump pit
- Which walls are finished
Questions
Does interior drain tile stop water coming through the wall?
It collects water that gets through and removes it before it reaches the floor. It does not stop the wall itself getting wet; that is what exterior waterproofing does.
