C.S. Lumber Co., Inc. engages in the design, manufacture and sale of wood products. It operates through the following segments: Pre-cut, Construction Contract, Real Estate Leasing, and Others. The Pre-cut segment handles pre-cut wood processing and the manufacture of panels. The Construction Contract segment manages construction of detached houses and wooden buildings. The Real Estate Leasing segment deals with leasing and management of commercial real estate properties. The Others segment includes the sale of real estate properties. The company was founded by Chiyozuke Nakai on April 1, 1983 and is headquartered in Chiba, Japan.