Kyowanissei Co.,Ltd. engages in the construction and civil engineering businesses in Japan. It operates in four segments: Gas Equipment Business, Gas Pipeline Business, Building Equipment Business, and Electrical and Civil Engineering Business. The company offers gas and appliance installation services, including design and installation of gas piping equipment; heating; hot water supply and air conditioning equipment construction; solar cell, fuel cell, and battery system construction; repair of commercial air conditioners; maintenance and inspection of commercial air conditioners; and commercial air conditioner cleaning services. It also provides gas pipeline construction, such as gas pipeline laying work; road paving work related to gas pipeline installation work; and maintenance services for gas pipeline and gas leakage. In addition, the company offers facility construction services comprising water supply and drainage sanitary facilities; heating, cooling, and ventilation construction; sale and construction of gas heat pump air conditioners and gas hot water systems; construction of disaster prevention equipment, which includes sprinkler equipment and inert gas fire extinguishing equipment; construction management of various piping facilities; renewal and rehabilitation works; construction of drainage and water supply pipes rehabilitation; and maintenance of water supply, hot water supply, drainage, ventilation, and other facilities. Further, it provides electrical installation and maintenance; construction of irrigation systems for golf courses, water supply and drainage systems for clubhouses, and air conditioning systems, as well as irrigation and greening of soccer stadiums and school grounds; general civil engineering works; road pavement repair work and parking lot maintenance works; and sewer pipe connections installation. The company was founded in 1893 and is headquartered in Chuo, Japan.