Medina sits on a Lake Washington peninsula with water on every side but the east, and the long wet season keeps crawl spaces damp unless ground cover, drainage and ventilation are in good shape. Removal means fixing the moisture, cleaning the framing and replacing wet insulation. Call the number on this page to be connected with a local mold remediation company in Medina.
A lakeside setting
Medina is a small, mostly residential city about 4 miles east of Seattle across the SR 520 Evergreen Point Floating Bridge, bordered by Clyde Hill and Hunts Point and wrapped by Lake Washington on all sides except the east. Its shoreline program also covers creeks, streams and wetlands inside the city. Homes near water breathe moist air, and lots that slope toward the lake can push groundwater and runoff against a foundation. Large footprints and finished spaces above a crawl space can make a small problem expensive if it goes unnoticed. Because the wet season runs from October into April, growth that starts in fall can spread across many joist bays before anyone opens the hatch, so an annual look under the house is a reasonable habit.
What to do now
- Shine a light through the access and look for water on the ground cover, sagging insulation and spotting on the joists.
- Check outside: gutters, downspouts, irrigation heads and any grade that slopes toward the house.
- Look under kitchens, baths and laundry rooms for drips or wet subfloor.
- Hold off on sprays and coatings; EPA says not to paint or caulk over mold.
- Arrange a full crawl-through by a remediation company or an independent inspector, and get the findings in writing.
Reading the signs
| What you see | Likely cause |
|---|---|
| Growth clustered under one bathroom | A slow supply or drain leak |
| Wet soil along the lake-facing or downhill wall | Runoff or groundwater moving through the lot |
| Beads of water on ducts or pipes | Damp crawl space air meeting cold metal |
| Spotting near every vent | Moist outdoor air entering through the vents |
| Fallen or gray batts | Long-term moisture weighing down insulation |
What affects cost
Angi's Seattle cost guide lists crawl space mold work at $425 to $1,650. HomeGuide's 2026 national range is $1,500 to $4,000. Footprint, the share of framing affected, clearance, insulation replacement, duct checks and any drainage or ground cover work set the total. If framing needs to be replaced, Medina's Development Services Department processes building permits; its director serves as the city's Building Official. Washington has no state mold license or certification, so confirm the company's registration with Washington L&I as a construction contractor.
Crawl Space Mold Removal questions in Medina
I rent. Who deals with a wet, moldy crawl space?
Should the same company inspect and remove the mold?
Does a dehumidifier help in a crawl space?
What does crawl space mold removal cost?
More mold services in Medina
Crawl Space Mold Removal nearby
Sources
- Wikipedia: Medina, Washington
- City of Medina: Shoreline Master Program
- City of Medina: Development Services Department
- City of Medina: Code Compliance
- Public Health - Seattle & King County: Mold (tenants and landlords)
- EPA: Mold Cleanup in Your Home
- EPA: A Brief Guide to Mold, Moisture and Your Home
- Angi: How Much Does Mold Remediation Cost in Seattle, WA?
- HomeGuide: How Much Does Mold Removal and Remediation Cost? (2026)
- Angi: How to Hire a Mold Remediation Company (separate testing and remediation)
- L&I: Verify a Contractor, Tradesperson or Business
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