More Of Everything In A Smaller Space. Stewart Lumber & Hardware Co. is a well known building supply business serving the Seattle, Wash. area. Whether you are a homeowner, contractor or remodeler, we have a wide selection of construction supplies to meet your needs. We are a family business under the same ownership since 1926. Our knowledgeable and friendly staff offer helpful advice and can help you find the right hardware or material to complete your building project. The large inventory at Stewart Lumber & Hardware Co. includes Lumber and plywood Decking Siding Millwork Doors and Windows, Sheetrock. Were here for you Monday through Saturday. Call for details and be sure to ask about monthly specials.