Your Local Basement Waterproofing Experts in Vashon

For reliable basement waterproofing, Vashon residents trust Three Brothers Waterproofing first. Vashon is a small city in King County, and its marine / oceanic climate drives the work we do here.

From Maplewood to Normandy Park, our teams serve Vashon and the wider western Washington, tackling the basement waterproofing problems that come with King County's warm, dry summers and heavy winter rainfall. We know the local properties and move fast across all 2 ZIP codes.

Each Vashon job comes with a written workmanship guarantee and a flat-rate quote you sign off on before we start - no surprises. That's why Vashon residents trust Three Brothers Waterproofing.