CH. Karnchang Public Company Limited, together with its subsidiaries, provides construction services in Thailand and the Lao People's Democratic Republic. It operates through two segments, Construction and Related Service and Investment in Infrastructure Business. The company engages in the construction of mass rapid transit systems, airports, roads and expressways, energy projects, water supply and harbour projects, and buildings. It also invests in infrastructure project development business; and sells construction materials. The company serves government agencies and private customers. CH. Karnchang Public Company Limited was founded in 1972 and is based in Bangkok, Thailand.