Ragnar Benson Construction is a full-service general contractor specializing in commuter rail, intermodal facilities, and ports. With almost 40 years of experience in the railway industry, we offer various delivery models, including general contracting, construction management, preconstruction, and design-build services. In addition, we specialize in constructing intermodal facilities, classification yards, mechanical repair facilities, fueling facilities, automobile marshaling terminals, and mainline capacity improvements. Focusing on innovation, safety, and environmentally-responsible construction, Ragnar Benson delivers quality work and service.

Since 1922, we have built a solid reputation by being a company our clients can rely on for a professional, innovative, and collaborative approach to their construction projects. For decades, Ragnar Benson has been recognized as one of Chicago’s leading builders.
New Ownership
Since 2005, we have been owned by William Charles, Ltd of Rockford, IL. William Charles is one of the largest privately held companies in Illinois and is involved in heavy highway construction, environmental remediation, general contracting and real estate development. We are able to provide a greater depth of services to our clients with the support and experience William Charles ownership brings.
IEA Acquisition
William Charles Construction including Ragnar Benson is acquired by Infrastructure and Energy Alternatives (IEA), ensuring continued growth and synergy for decades to come.
MasTec Acquisition
Acquired by MasTec and are now part of the organization’s Clean Energy and Infrastructure segment.






Our employees are the keys to our success

We recognize the value of having experienced employees who provide real-world insights and experience, and at the same time, we value new talent able to bring fresh ideas to our company. We pride ourselves in working as a team to accomplish a common goal, and to provide the utmost in high quality construction and service.