Hanoi Construction Joint Stock Company No. 1 (HACC1), established in 1958, is a leading Vietnamese construction company. Headquartered in Hanoi, HACC1 specializes in a wide range of construction activities, including industrial and civil construction, irrigation works, transportation infrastructure, and power line construction. The company also engages in real estate development, building material manufacturing and trading, and participates in Build-Operate-Transfer (BOT) projects. While originally a state-owned enterprise under Hanoi Construction Corporation, HACC1 transitioned to a joint stock company in 2005 and has since established itself as a major player in the Vietnamese construction and real estate sectors.