Ultimate Guide 9 min read Updated 2026-02-01

Basement Waterproofing Guide 2026

Stop basement leaks. Interior vs exterior solutions, costs, and DIY options.

Waterproofing Solutions

MethodCostEffectiveness
Interior sealant$500-$1,500Temporary
Interior drainage$3,000-$8,000Good
Sump pump$500-$1,500Essential
Exterior waterproofing$8,000-$15,000Best
French drain$2,000-$6,000Good

Recommended Approach

  • Identify source - Groundwater vs surface water
  • Grade away from house - Extend downspouts
  • Install sump pump - If needed
  • Interior drainage - For active water
  • Exterior - For severe problems
Most basements need combo of solutions.

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