Parking Lot Sealcoating in Seattle, Washington

Coal-tar or asphalt emulsion sealcoat application to protect and extend the life of existing asphalt. In Seattle, pricing typically runs $0.14 to $0.34 per sq ft (single coat with crack fill) — about 15% above the national average. Wet coastal Pacific with low UV but heavy rainfall saturation — drainage design is everything. Glacial till with variable silt layers — perched water tables complicate subgrade. Permitted through Seattle Department of Construction and Inspections; typical review window 12-20 weeks with Green Factor and stormwater overlay.