Headquartered in Neenah, Wisconsin and with branch offices in Valparaiso, Indiana and Machesney Park, Illinois, the McMahon Group is composed of four affiliated firms offering a broad spectrum of professional services to meet clients' specific needs.

The McMahon Group's portfolio includes manufacturing/industrial facilities, commercial, education, institutional, recreational, civic, public works and water/wastewater treatment plants. Our history of repeat service shows the success of our commitment to delivering high-quality projects, on time and within budget.