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Basement Waterproofing Cost in Washington
Read what 2 homeowners actually wroteIn Washington, basement waterproofing typically costs between $4,000 and $6,000, with most homeowners paying around $5,000. Data from recent projects shows a median price of $5,000, while the 25th percentile sits at $4,500 and the 75th percentile at $5,500.
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Shaded band: middle 50% of reports (25th–75th percentile). Median tick in teal.
Most jobs land between $4,100.00 and $5,900.00 (5th–95th percentile). Ignoring 1 outlier below and 1 above.
Based on reports from Apr 2026 (first entries this month).
Data last updated Apr 8, 2026.
Size context is still being collected (0 of 2 reports include home size or system size). Numbers above may not reflect what your specific home would pay. Add a report to sharpen this →
Latest reports
The underlying prices behind this page.
Purchased a house with a mouse-infested crawlspace and paid 6k for full service including remediation, tearing everything out, cleaning, re-insulating, and sealing, with a 20-year…
Paid $4k in 2017 for crawl space insulation replacement in a 1200 sq foot house in Seattle.
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