Basement Mold Removal in Burien, WA

Signs to look for

• A damp, musty smell in a lower level, especially after a storm off the Sound
• Black or green specks along the bottom of walls and behind furniture
• A white crusty bloom on concrete block or poured walls
• Soft or stained baseboards and swollen door trim
• Window wells holding water after heavy rain

Burien conditions

Burien sits just south of Seattle, about 11 miles from downtown, with 5.5 miles of Puget Sound shoreline along its western edge. For waterfront homes the main risk is salt water. FEMA maps set base flood elevations (Zone VE) and flood depths (Zone AO) for properties next to the Sound. On Dec. 18, 2024 a +12.66-foot high tide combined with strong wind sent waves over waterfront properties at Three Tree Point and left water and debris across SW 172nd Street. A lower level that takes in water during a storm like that has to be dried fast; EPA says to assume mold growth if a flooded space couldn't be dried within 24 to 48 hours.

Away from the shoreline, Burien basements get wet the usual Puget Sound way: saturated soil through a long rainy season, groundwater pushing on the uphill wall of a house built into a slope, and condensation on cold concrete in winter. You can look up your flood zone on King County's online flood map. Homeowners and renters policies don't cover flood damage.

What affects the cost

Angi's Seattle cost guide lists basement mold work at $425 to $2,475. Nationally, HomeGuide's 2026 figures are $1,500 to $6,000 for part of a basement and $6,000 to $15,000 for all of it. A finished room with carpet, pad and drywall to remove costs more than an unfinished space, and saltwater flooding can add debris removal and more demolition. Repairs to electrical, gas, mechanical or plumbing systems afterward may need a City of Burien permit.

What happens when you call

This site is a referral line, not a mold company. Your call reaches an independent local remediation company that will ask about the water source, how long things have been wet and whether you own or rent. Burien renters in apartments, duplexes, triplexes and four-plexes are covered by the city's Rental Housing Inspection Program, which inspects those buildings every three years; give the landlord written notice first, then contact the city if the landlord doesn't respond. Before hiring, check the company's construction contractor registration on L&I's Verify a Contractor tool, and ask whether an independent inspector will do the clearance check.