Our Winkelman office was originally founded by Don Winkelman, Sr. and his sons in 1969, providing services in Central Minnesota as a 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. This transition brought enhanced financial stability, a stronger commitment to safety, nation-leading tools, processes and resources, while maintaining a strong local focus and commitment managed by a tenured local management team.



A legacy begins...

In 1969, Don Winkelman opens Winkelman Enterprises in the basement of a duplex in north St. Cloud. Duane Schultz joins the same year.


Early success

After completing its first big project, Dick Putz Field and Municipal Ice Arena in St. Cloud, the company builds its new office in northeast Sauk Rapids, allowing space for more employees and positioning itself for growth.


Technology leader

The company introduces the first use of laser level technology in Central Minnesota with the Nash Finch distribution project, adding to its growing portfolio of quality manufacturing facilities.


Building a strong future

Duane Schultz and Keith Schupp purchase the company. Under their leadership, Winkelman evolves to provide design build/ construction management services which set the company apart from this point forward.


A new niche in education

The company builds five new schools in Central Minnesota - including its largest project to date, St. Michael/Albertville High School - paving the way to becoming the education building specialist it is today.


An industry leader recognized

Duane Schultz is inducted into the MN Associated Builders and Contractors (ABC) Hall of Fame. Soon after, the company wins a National Excellence in Construction award from ABC for remarkable achievements in leadership, safety, innovation and diversity with the College of St. Benedict Ardolf Science Center.


Preserving a landmark

The company renovates the historic Paramount Theater in St. Cloud and wins the outstanding preservation award from the Minnesota Preservation Alliance.


Building green

The company moves into its new energy efficient office space on Highway 10. Not long after, Keith Schupp becomes the first LEED certified professional in Minnesota.


Community recognition

After 36 years of business success and community involvement, the St. Cloud Chamber of Commerce awards the company, and longtime Chamber member, Small Business Persons of the Year. It’s a career highlight for both owners.


Building strong client relationships

As the company continues to grow, so does its relationships with clients. As a result, several private clients request the company’s services for building projects across the United States.


Opportunities and versatility

The company continues to evolve its internal development processes to promote growth and longevity, which include creating opportunities for investment in multi-family and senior housing projects.


A tradition of community involvement

The company’s focus on building the community goes well beyond brick and mortar. Gifts to the community include major donations to local organizations and pro bono work, such as donating construction management services to the Lake George Fountain.


Setting the standard for future generations

As the company prepares for a new chapter of success, it pays tribute to the longtime employees who set the standard and built a legacy for generations to come.


The Winkelman legacy transitions to Bradbury Stamm Construction.


Breaking new ground

The company completes it’s largest project in its history - the $89 Million Sartell High School.