MoldHelpUSAWhy mold is common in Olympia
Olympia Airport, the nearest official station, averages about 51 inches of precipitation a year under NOAA's 1991–2020 normals, and November, December, and January each bring close to 8 inches. That is a lot more water than Seattle sees, spread over months of short, cool, cloudy days when nothing dries quickly.
About 48% of Olympia's homes were built before 1980, and about 12% before 1940, according to the Census Bureau. Older houses on the Eastside, Westside, and in South Capitol often sit on crawl spaces with limited venting, single-pane windows, and attics that collect condensation. Ground that stays saturated through the winter pushes moisture up into crawl spaces with torn or missing vapor barriers.
Drying wet materials within a day or two, as the EPA suggests, takes a dehumidifier in an Olympia winter.
Source: NOAA climate normals
Mold services in Olympia
What mold work costs in Thurston County
| Service | Typical range |
|---|---|
| Mold inspection, national range | $300–$1,000 |
| Lab sample, per sample (national) | $50–$350 |
| Typical remediation job (national) | $1,100–$3,400 |
The ranges are national, from Angi and HomeGuide. In Thurston County, crawl space vapor barriers, vent repairs, and attic ventilation are common add-ons, quoted apart from the mold removal. See the remediation cost guide.
Washington mold licensing: what to check
No Washington license exists for mold remediation. Before hiring in Olympia, run the company through L&I's "Verify a contractor" lookup to confirm it is registered, bonded, and insured, and ask what will change in the crawl space or attic so the moisture does not come back. See the Washington page.
Will insurance cover it?
Most Olympia mold comes from months of winter dampness, which insurers usually treat as maintenance rather than a covered loss. A pipe that freezes and bursts, or a roof torn open in a windstorm, is more likely to be covered, usually up to a mold limit. Flooding from Budd Inlet or a creek needs a flood policy. Thurston County owners can ask the state Insurance Commissioner for help if a claim is denied. See does insurance cover mold.
Areas we connect you in
Eastside, Westside, South Capitol, Downtown, Bigelow Highlands, Northeast Olympia, Southeast Olympia, Cooper Point area, Wildwood, Carlyon, and surrounding neighborhoods of Olympia.