Yagi Koumuten is a timber construction company that adopts the KES and SL structural methods. The company uses cellulose-fiber insulation, solid wood and domestic timber. It has a group company, Kikuchi-gumi, with a processing workshop in Tsuzuki-ku, Yokohama. Yagi Koumuten participates in local community events, for example the 40th Hisasue Furusato parent–child festival on 3 September 2017. The company's technical staff provide information and answer inquiries regarding KES/SL methods, cellulose insulation and timber materials.