Welcome to Knudson Lumber! Knudson Lumber has been a part of the Kittitas Valley since 1937. We offer a full service lumberyard with delivery throughout Kittitas County and beyond. Knudson Lumber has one of the largest selections of timbers in Central Washington along with quality doug fir and treated lumber. We also offer windows, doors, metal roofing , siding, decking, paint. lawn and garden items, pavers, landscaping blocks, plumbing, eclectrical, tools and more.