Wiegmann Associates is proud to again be named as one of St. Louis’ Largest Mechanical Contractors by the St. Louis Business Journal. Thank you to our amazing team and clients for fueling our longevity and growth!

Based in St. Charles, Missouri with nearly 120 employees, Wiegmann Associates was ranked the 7th largest mechanical contractor in St. Louis. Since 1995, Wiegmann Associates has focused on offering innovative, energy saving and cost-effective HVAC solutions in St. Louis and across the United States. Today, Wiegmann is one of the industry’s premiere national design/build mechanical contractors and an expert in value engineering.