basement waterproofing cost

Basement waterproofing in Los Angeles typically costs $5,000–$15,000 for a 1,000 sq ft basement, with interior drainage systems on the lower end and exterior excavation at the top. The right approach depends on where water is entering. This 2026 guide breaks down cost by method, what insurance covers, and when active water intrusion must be professionally dried before waterproofing can proceed. Free inspection: (818) 336-1800.