About Us

Our doors opened in 1904 as Arnzen Construction and with the addition of St. Rosa Lumber in 1998, we have expanded our ability to serve regional residents, businesses and farms with an unwavering commitment to quality, innovation and customer service.

We’re constantly developing new products, services and capabilities to ensure that our clients can rely on us for the best in materials, designs and construction methods.



Our management and sales team includes:

John Arnzen, who is responsible for sales, project supervision and managing the materials purchasing and overall quality of all Arnzen Construction and
St. Rosa Lumber services.

For 40 years, John has worked in construction, project management and sales. He’s the fourth generation of his family to manage Arnzen Construction, and was recognized as one of 10 Outstanding Young Minnesotans in 2000.


Lillian Arnzen, who brings over twenty years of expertise and integrity to managing all office operations.








Welding shop manager Mike Arnzen, has 25 years of experience in managing welding shop operations and staff with responsibilities for sales, purchasing materials and overall quality of the welding services.






Jason Rademacher brings his 25 years of experience in building and manages the parts and equipment purchasing for Arnzen Construction.







Design Sales & Project Managers