CH. Karnchang is a leading builder and infrastructure developer in Thailand. The company builds commercial structures, utility facilities, highways, bridges, and other infrastructure projects. Established in 1972, CH. Karnchang also invests in the Thai government's public works projects in an effort to expand its construction services. Recent projects, many undertaken through joint ventures, include Bangkok's first underground mass transit system, the Royal Thai Police headquarters, a wastewater system for Phuket, and Thai Airways International cargo maintenance area. Various subsidiaries additionally trade in construction materials, real estate, and construction material manufacturing, among others.