Our Winkelman office was originally founded by Don Winkelman, Sr. and his sons in 1969, providing services in Central Minnesota as a general contractor focused on commercial and institutional construction.
In 1983, two of the company’s long-term employees, Duane Schultz and Keith Schupp, purchased and began to grow the family-owned business. Over the years the Winkelman office built upon its knowledge and reputation to become a regional full-service construction company working primarily in Central Minnesota but also in Wisconsin, North Dakota and Iowa. In 2017, the firm transitioned to the Bradbury Stamm family of companies where we continue to work to enhance their capabilities and to support their local markets.
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