CH. Karnchang Public Company Limited, together with its subsidiaries, provides construction services in Thailand and the Lao People's Democratic Republic. The company offers engineering and construction services for infrastructure construction work, including roads, bridges, elevated roads, expressways, and building and industrial factory construction work, as well as mechanical and electrical equipment work comprising installation of equipment and machinery for various factories, etc.; and mass rapid transit systems, airports, and water supply and harbors. It also invests in infrastructure projects; sells construction materials; and rents construction equipment. The company serves government agencies, state enterprises, and private entities. CH. Karnchang Public Company Limited was incorporated in 1972 and is headquartered in Bangkok, Thailand.