Helmkamp Construction Co.
ConstructionIllinois, United States11-50 Employees
Helmkamp Construction Co. is a mid-sized contractor based in East Alton, Illinois, with roots dating back to 1938. The company carries out a range of self-performed construction trades, including excavations, concrete foundations and slabs, structural steel, rough and finish carpentry, labs, millwright equipment installations, and laser alignment and precision leveling tasks. It serves a broad set of private markets, such as building, chemical, data/communication, educational, financial, food and beverage, healthcare, manufacturing, metals/steel, pharmaceutical, power, and refining. While its operations are centered in Illinois and Missouri, Helmkamp markets its capabilities nationally and has undertaken work in additional states at customer request. In January 2026, the firm announced a partnership with Vestal Corporation as part of an integrated project team supporting Wieland's transformational investment.