ServiCover📌 Key Takeaway: Interior drainage systems usually cost $2,000-$6,000, exterior membrane waterproofing $5,000-$10,000, and injecting a single leaking crack $300-$1,000.
Waterproofing Options
| Solution | Typical Cost | Notes |
|---|---|---|
| Leaking crack injection | $300-$1,000 | For isolated leaks |
| Interior drainage system | $2,000-$6,000 | Channels water to a sump pump |
| Exterior membrane | $5,000-$10,000 | Requires excavation; stops water at the wall |
Start With the Cheap Fixes
- Clean gutters and extend downspouts several feet from the house.
- Regrade soil so it slopes away from the foundation.
- Seal window wells and add covers.
Interior vs. Exterior
Interior systems manage water that gets in and are less disruptive. Exterior waterproofing stops water before it reaches the wall but means digging around the foundation, which also disturbs landscaping.
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Get Free Quotes →Frequently Asked Questions
Is a damp basement a foundation problem?
Not always — condensation and poor drainage are common causes. Persistent water through cracks can weaken walls over time.
Does waterproofing add value?
A dry basement with a transferable warranty is a strong selling point, especially if you plan to finish the space.
🔎 How we research: The ServiCover Editorial Team compiles prices and guidance from published 2026 cost guides, manufacturer information and industry sources. Prices are national ranges and vary by location, home and provider, so always compare written quotes. We don't perform the work ourselves, and we may earn a commission when you request quotes through our partners — see our Advertiser Disclosure.