The McMahon Group is a family of companies providing engineering, architectural, design/build and operations services to public and private clients since 1909. As we enter our next century of business, we are committed to designing for a sustainable future and helping our clients meet the challenges that lie ahead.

The McMahon Group's portfolio spans from local public works projects to high-rise structural design; from innovative wastewater treatment facilities to lean architecture for medical facilities; from unique storm water management solutions to utilizing GIS to help communities manage their assets. Our history of repeat service demonstrates the success of our commitment to delivering high-quality projects, on time and within budget.

We operate from our corporate headquarters in Neenah, Wisconsin, with additional office locations in Machesney Park, Illinois and Valparaiso, Indiana. From these locations, we have a strong local presence as well as national service capabilities.

Your goals. Your schedule. Your budget.
Your project, delivered the McMAHON way.