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Steel Building – Hay Shed – Eastern South Dakota_edited.jpg

About Us

Seppanen Contracting is a full-service contractor in South Dakota

We are your turnkey solution from the time of concept to construction.

We offer construction design and build, steel erection, and development. In addition, we are a full-service concrete contractor. Our projects and capabilities range from heavy to light commercial, agriculture projects such as dairy facilities, farm shops, hay sheds, and much more. We have a wide service area in South Dakota and North Dakota.



Take Responsibility & Be Accountable

As a dedicated group of employees and owners, we understand that safety requires a teamwork approach to impact, influence, and inspire one another to be responsible for keeping each other safe and healthy.

Each employee and owner has the right to derive personal satisfaction from his or her job and the prevention of occupational injury or illness is of such importance that safety must always be given top priority.  


The commitment we make every day with regard to safety is to adhere to our industry-leading safety standards, hold safety at the forefront of everything we do, continually improve our processes, demonstrate leadership, and promote comprehensive safety programs, policies, and procedures. SCI expects all Employees and its partners to take responsibility and be accountable for making this commitment to themselves, our clients, our community, and our families. 

Meet Our Leadership

View Our Latest Projects

View some of our past projects. We can specialize in commercial and agriculture projects, including dairy facilities, farm shops, hay sheds, concrete flatwork, steel buildings, rural buildings, and much more. See what we can do for you! 


John E. Seppanen, President

Russell Seppanen, Vice President


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