Basement Waterproofing in Delaware costs $2,350-$8,100 (avg $4,700). See costs by method, local factors, and how to save.

Basement waterproofing costs $2,250-$7,800 nationally (avg $4,500). See costs by method, size, and state. Includes DIY vs pro breakdown, what contractors won’t tell you, and how to save 20-40%.