Crawl Space Mold Removal in Burien, WA

Clues that point under the floor

• An odor like wet cardboard or soil that lingers in rooms over the crawl space
• Growth on the joists nearest the vents, where damp outside air enters first
• Insulation that is wet, compressed or falling
• A water line, debris or salt crust inside the space after a storm tide
• Window and wall condensation upstairs that seems heavier than it used to be

Shoreline and inland conditions

Burien is a Highline-area city about 11 miles south of Seattle, with 5.5 miles of Puget Sound along its western edge. For homes on the water, the risk is easy to picture. On Dec. 18, 2024 a +12.66-foot high tide combined with strong wind sent waves over waterfront properties and roads at Three Tree Point, covering SW 172nd Street with water and debris and causing localized flooding. FEMA maps set base flood elevations and flood depths for properties next to the Sound, and owners can look up their zone on King County's online flood map or call the city's floodplain administrator. Seawater that reached a crawl space needs to be cleaned out and dried quickly, not left to evaporate.

Inland, around Olde Burien and the streets east of Ambaum Boulevard, the problem is slower: vents breathing wet air from fall through spring, soil that doesn't dry, and gutters or downspouts that dump water against the foundation. Repairs to plumbing, gas, electrical or mechanical systems uncovered during cleanup may need a City of Burien permit.

Cost drivers

Angi's Seattle cost guide puts crawl space mold work at $425 to $1,650; HomeGuide's 2026 national range is $1,500 to $4,000. A Burien estimate rises with the size of the affected area, tight clearance, the amount of insulation and debris to haul out, and any ground cover or drainage work. Salt-water intrusion and storm debris usually mean more removal than a slow seasonal mold problem.

What the call sets up

The line puts you in touch with an independent local mold remediation company; this site doesn't do the work. Mention whether water came in during a storm tide, how long the smell has been there and whether the source is fixed. Expect a crawl-through with moisture readings and a written scope. Washington has no state mold license, so check the company's contractor registration on L&I's Verify a Contractor tool. Public Health - Seattle & King County doesn't do mold assessments, but it does offer guidance for homeowners and tenants.