Mold Removal Cost And Risk In King County, WA

A typical professional mold job in King County runs about $1,650 to $6,650 before rebuild, using the Seattle-Tacoma-Bellevue, WA price level. Below are the 82 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Washington rules.

1983Median year homes were built

47%Homes built before 1980

44%Homes rented, not owned

$811,200Median home value

988,330Housing units

2,262,713People

Housing figures from Census ACS 2019 to 2023. Remediation workers here earn a median $28.99 an hour, BLS May 2025 wage survey.

Half the homes in King County were built before 1983, and 47 percent went up before 1980. Older plumbing, roofs and window seals are where slow leaks start, and slow leaks are the mold most home policies leave out. About 44 percent of homes in King County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 98112 has the oldest homes here, a median year of 1944, and ZIP 98121 the newest, 2004.

Typical Prices In King County

JobSizeNational RangeKing County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,650 to $6,650
Mold Remediationan attic$2,000 to $7,500$2,200 to $8,350
Mold Inspection and Testinga visual inspection$200 to $600$200 to $650
Mold Inspection and Testingan inspection with samples$300 to $1,000$350 to $1,100
Mold Inspection and Testinga clearance test$300 to $800$350 to $900

Estimate is the national range times 111.1 divided by 100, the price level for Seattle-Tacoma-Bellevue, WA, rounded to $50. National ranges from Remediational cost guide, price level from BEA Regional Price Parities 2024.

The standard limited fungi endorsement caps mold at $5,000. Against a typical job here of up to $6,650, that cap falls short by about $1,650 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates King County high for inland flooding, winter weather. Water from these events is where mold claims start, and flood water is a separate policy. FloodSmart says mold damage is not covered under standard NFIP flood policies. FloodSmart

HazardFEMA Risk Rating
Inland floodingVery High
Coastal floodingRelatively Moderate
HurricaneNot Applicable
Cold waveRelatively Low
Winter weatherRelatively High

Source FEMA National Risk Index, December 2025, county level.

ZIP Code Neighborhoods In King County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
98001Auburn198445%$538,800
98002Auburn197951%$397,700
98003Federal Way198342%$428,500
98004Bellevue200028%$2,000,001
98005Bellevue197952%$1,373,000
98006Bellevue197952%$1,233,500
98007Bellevue197855%$934,600
98008Bellevue196874%$1,130,000
98010King County199725%$793,300
98011Bothell199323%$888,000
98014King County199031%$849,500
98019King County199311%$746,500
98022King County198246%$577,200
98023Federal Way198440%$545,600
98024King County198146%$1,005,100
98025King CountyNot published100%Not published
98027King County198736%$976,400
98028Kenmore198443%$869,800
98029King County20014%$964,400
98030Kent198636%$540,100
98031Kent198343%$552,300
98032Kent198539%$473,000
98033Kirkland198936%$1,259,900
98034Kirkland198050%$875,200
98038King County199718%$714,100
98039Medina197456%$2,000,001
98040Mercer Island197361%$1,884,200
98042Lake Morton-Berrydale198738%$613,000
98045King County198832%$845,700
98047Pacific198737%$431,300
98050King CountyNot published17%Not published
98051King County198839%$702,500
98052Redmond199028%$1,107,900
98053Union Hill-Novelty Hill200114%$1,155,500
98055Renton199129%$561,600
98056Renton198939%$726,300
98057Renton198743%$606,500
98058Fairwood197951%$627,200
98059East Renton Highlands199232%$809,800
98065King County200319%$890,300
98070Vashon197459%$717,700
98072Cottage Lake198829%$1,067,000
98074Sammamish199116%$1,211,700
98075Sammamish199917%$1,457,900
98077Cottage Lake198630%$1,131,500
98092King County199821%$594,800
98101Seattle199733%$741,400
98102Seattle197256%$988,700
98103Seattle196760%$1,012,900
98104Seattle198744%$663,000
98105Seattle197553%$1,261,100
98106Seattle198050%$666,800
98107Seattle199238%$924,900
98108Seattle196959%$693,500
98109Seattle200330%$986,000
98112Seattle194474%$1,407,400
98115Seattle196066%$1,041,500
98116Seattle197356%$917,000
98117Seattle195073%$1,028,100
98118Seattle196662%$746,400
98119Seattle196860%$1,032,500
98121Seattle200420%$796,600
98122Seattle198746%$929,400
98125Seattle197359%$844,500
98126Seattle196358%$751,900
98133Shoreline197458%$719,100
98134Seattle197067%$385,300
98136Seattle195965%$900,000
98144Seattle197354%$890,400
98146Burien196565%$642,300
98148Burien197754%$576,400
98155Shoreline196970%$758,000
98164SeattleNot published0%$714,600
98166Burien196077%$785,700
98168Tukwila196470%$500,600
98177Shoreline196080%$995,700
98178Bryn Mawr-Skyway196067%$628,200
98188Tukwila197558%$452,900
98198Des Moines197559%$527,100
98199Seattle196073%$1,160,000
98224King County197367%$604,700
98288King County197064%$442,300

ZIP areas are Census ZIP Code Tabulation Areas, placed in the county that holds most of their land, per the Census 2020 ZIP relationship files.

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