• Licensed & insured local pros
• Free, no-obligation quotes
• Compare multiple quotes side by side

Last updated: October 2026

Mold remediation costs in Washington follow national ranges — roughly $10–$25 per square foot, or about $5,350 for a typical project (2026 industry reference data) — but the housing stock and climate vary widely by city. Across the 10 Washington cities we track, an average of 50.4% of homes were built before 1980 (U.S. Census Bureau, ACS 2020–2024) with average annual rainfall of 33.2 in/yr (NOAA 1991–2020 normals). Older homes plus persistent moisture is the combination that drives most remediation jobs.

City-by-city cost guides

• Mold remediation cost in Bellevue, WA — pop. 151,847
• Mold remediation cost in Bellingham, WA — pop. 93,438
• Mold remediation cost in Everett, WA — pop. 111,845
• Mold remediation cost in Kent, WA — pop. 135,603
• Mold remediation cost in Renton, WA — pop. 105,317
• Mold remediation cost in Seattle, WA — pop. 754,195
• Mold remediation cost in Spokane, WA — pop. 230,293
• Mold remediation cost in Tacoma, WA — pop. 222,758
• Mold remediation cost in Vancouver, WA — pop. 195,300
• Mold remediation cost in Yakima, WA — pop. 96,961

How to use these guides

Each city page pairs the national cost ranges with that city's real housing-age and rainfall data, so you can see whether your home sits in a higher-risk profile before you collect quotes. When you do call contractors, get at least three written quotes, confirm they address the moisture source (not just the mold), and ask for post-remediation clearance testing.