Waterproofing March 5, 2026
Basement Waterproofing in NYC: Interior vs Exterior Systems
Which basement waterproofing system is right for your NYC home — and what each one costs.
Interior systems (drain tile + sump pump) start around $4,000 for a typical NYC basement and handle water once it's already in.
Exterior systems (excavation + membrane + drainage board) start around $12,000 and stop water at the wall — the right answer for chronic leaks.
Crack injection ($500–$1,500) is the fix for a single hairline leak.
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