Wiegmann Associates has been named one of St. Louis' Largest Mechanical Contractors by the St. Louis Business Journal.  Wiegmann ranked in the top 10 with 225 employees nationwide. Wiegmann Associates is national mechanical contractor serving the commercial, industrial and institutional...

ST. LOUIS, MO – Wiegmann Associates won a Contracting Business Design/Build award for their work on the St. Charles Old Post Office historic renovation. The HVAC upgrade was part of a project to convert the St. Charles Old Post Office located...