Castle Rock Building Supply

We are a small, family-owned building supply store in beautiful downtown Castle Rock, Washington. Castle Rock Building Supply has been serving Cowlitz and southern Lewis counties since the 1930s. Owner Ken Campbell has been serving the area since the 1960s and has been providing the building material you need since 2005. Customer service is our business, and we are able to provide it on a personal level that you can't get at larger stores.

Services & Products

We stock or can order almost everything you need for your building project. We carry a large selection of treated and untreated lumber and plywood. Drywall and accessories, Composition and Metal Roofing, Nails, Screws, Fasteners, Power and Hand Tools, Spray Paint, Stains and Sealers, Electrical, Lighting, Plumbing, Pre-mixed Concrete, Cement, Cement Blocks and Rebar. We can order a wide variety of Milgard Windows, Masonite Doors and Wayne Dalton Garage Doors, along with other brands. We also provide delivery service for lumber and other materials you might need.

Standard Lumber

Our standard fir lumber 1x2 through 2x12 is all Kiln Dried. These are the sizes and lengths we handle. We can special order different lengths. We do not stock 14 foot lengths in KD lumber. 1x2 - 8ft 1x4 - 8ft & 12ft 1x6 - 8ft 2x2 - 8ft 2x4 - 92 5/8 thru 16ft No 14' 2x6 - 92 5/8 thru 20ft No 14 or 18' 2x8 - 8ft thru 20ft No 14' 2x10 - 8ft thru 20ft No 14' 2x12 - 8ft thru 20ft No 14'. Our standard fir beams 4x6 and larger are all green. These are the sizes and lengths we generally carry. We can order any even lengths 8 feet and over that we don't have in stock. We can also get kiln dried and appearance grade beams upon request. Please call for availability. 4x6 - 8 thru 16ft 4x8 - 8 thru 16ft 4x10 - 8 thru 16ft 4x12 - 8 thru 16ft 6x6 - 8 thru 16ft 6x8 - 8 thru 16ft 6x10 - 8 thru 16ft 6x12 - 8 thru 16ft