Since Gerry Wiegmann ventured on his own to start Wiegmann Associates in 1995, two things have remained constant for the company — the mechanical contractor specializes in HVAC systems, and a Wiegmann has always been heavily involved in the company’s operations. But...

Wiegmann Associates has been named one of the top specialty contractors in the nation by Engineering News Record, the leading international construction industry news magazine. With $61.2 million in 2020 revenue, Wiegmann Associates ranks among the largest mechanical contractors in...

We are proud to announce that Wiegmann Associates was ranked among the Top 150 Privately Held Companies in St. Louis by the St. Louis Business Journal. Thank you to our amazing team and clients for fueling our growth and longevity!

Wiegmann Associates has once again been named one of the top specialty contractors in the Midwest by Engineering News-Record, the leading international construction industry news magazine. With $48.81 million in 2020 revenue, Wiegmann Associates was ranked the 6th largest mechanical…

ST. LOUIS, MO – Josh Estrel of O’Fallon, MO has joined Wiegmann Associates as a Project Engineer. He is responsible for designing and engineering heating, cooling and ventilation systems for various Wiegmann Associates projects. Estrel holds a bachelor’s degree in Mechanical…

ST. LOUIS, MO – Zachary Vanelli of Ballwin, MO has joined Wiegmann Associates as an Account Executive. He is responsible for communicating with customers about potential project opportunities, developing conceptual designs, performing engineering loads and calculations and generating construction proposals….

Rendering courtesy of Perkins + Will ST LOUIS, MO – Wiegmann Associates has begun HVAC work as part of a $105 million renovation and expansion project at Lindbergh High School in St. Louis, MO. As the mechanical contractor, Wiegmann is...

ST. LOUIS, MO – Wiegmann Associates has been awarded a 2021 Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) Safety Excellence Award in the 200,001-300,000 man-hour category. Every year SMACNA recognizes its members with the lowest injury/illness rates. This…

ST LOUIS, MO – Wiegmann Associates has completed HVAC work for two cannabis cultivation facilities in St. Louis, MO. As the Engineer of Record and mechanical contractor for the design/build project, Wiegmann designed and installed a system that adheres to...

With 105 employees and 2020 revenue of $64.45 million, Wiegmann Associates has been named the 5th largest St. Louis Mechanical Contractor by the St. Louis Business Journal. Wiegmann Associates is a St. Louis-based mechanical contractor and a national leader in...