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Seattle House Algae Removal

House algae removal strips the green film that coats siding on the shaded, rain-fed walls so common across the Northwest.

Seattle House Algae Removal

That greenish sheen on your walls is algae feeding on the constant moisture and shade our region provides. We soft wash the affected siding with a solution that dissolves the algae and its foothold rather than smearing it around. Killing the growth at the root means the green does not simply bloom back after the next rain. Your siding returns to its true color, and the treated surface holds off regrowth much longer.

Local Service Information

Seattle

The region’s largest city and the King County seat, set between Puget Sound and Lake Washington on hilly terrain.

County: King County
ZIP Codes Served: 98101, 98103, 98105, 98115, 98118, 98122, 98133
Neighborhoods: Ballard, Capitol Hill, Fremont, West Seattle, Queen Anne, Rainier Valley, University District
Nearby Communities: Shoreline, Burien, Tukwila, Mercer Island, Bellevue
Common Property Types: Predominantly single-family homes along with townhomes, condominiums, and multifamily housing; commercial property includes retail, office, and mixed-use buildings.
Local Tree & Landscape Notes: Common regional trees include Douglas fir, western red cedar, western hemlock, bigleaf maple, and red alder, alongside many ornamental species. Wet soils and dense canopy are common considerations for access and scheduling.
Permit Considerations: Permit requirements vary depending on tree size, species, protected areas, shoreline regulations, critical areas, and local municipal code. Always verify current requirements with the local jurisdiction before beginning work.
Climate: Marine west coast climate typical of the Puget Sound region: mild, wet winters and warm, relatively dry summers, with most rainfall from fall through spring. Occasional wind, snow, and ice events and seasonal soil saturation influence tree health and the timing of tree work.

From the craftsman blocks of Ballard and Queen Anne to the hillside homes of West Seattle and Rainier Valley, Seattle properties face relentless moisture that dulls siding and coats hard surfaces in green. Our exterior-cleaning crews handle pressure washing, soft washing, and house washing across the city’s dense mix of homes and small commercial buildings, restoring curb appeal near landmarks like Discovery Park and the Washington Park Arboretum.

Seattle’s neighborhoods range from tightly packed rowhouses in Capitol Hill and Fremont to larger lots in the University District, so we bring flexible access solutions and surface-specific methods to every job, whether it is a shared townhome wall or a detached single-family exterior.

Site Conditions: The city’s cool, damp lowland weather feeds persistent moss on shaded roofs, algae streaks down north-facing siding, and slick mildew on brick and concrete steps. Mature street trees drop needles, leaves, and pollen that clog gutters and stain walkways throughout Seattle’s older neighborhoods.
Seasonal Considerations: Long wet winters make fall gutter cleaning and roof moss treatment a priority before the rainy season peaks, while the drier stretch from late spring into summer opens the best window for full house washing and deck restoration ahead of outdoor entertaining.
Common Project Types: Popular Seattle services include house washing for weathered siding, moss removal and soft washing on asphalt-shingle roofs, gutter cleaning, driveway and stair pressure washing, and brightening for the wood and composite decks common on the city’s sloped lots.
Property Styles: Century-old craftsman and Victorian homes, mid-century boxes, and modern infill townhomes all share the streets here, so we match cleaning pressure and detergents to painted wood, cedar shingle, stucco, and newer fiber-cement finishes.
Local Materials & Plants: Seattle exteriors commonly feature painted-wood and cedar-shingle siding, brick, asphalt roofing, and concrete or paver hardscapes that attract moss, green and black algae, lichen, and mildew under the shade of mature maples and firs.
Planning Your Project: We plan Seattle work around narrow streets, steep driveways, and limited parking, coordinating access and protecting mature landscaping. On multifamily and mixed-use buildings, we schedule around tenants and match low-pressure soft washing to delicate historic finishes.

Give your Seattle home or building a fresh, clean face. Share which siding, roof, or hardscape surfaces need attention, and we will outline the right exterior-cleaning approach for your neighborhood.

Benefits

Dissolves the green algae film completely; Kills the growth at its root; Slows the return of the green sheen; Restores siding to its true color

Process

1) Identify the walls with the heaviest green coating; 2) Apply an algae-killing solution at gentle pressure; 3) Let it dwell to break down the growth fully; 4) Rinse evenly and verify the green is cleared

Ready to get started?

Schedule house algae removal and clear the green film so your true siding color shows again.
Call: 425-390-8500