ISG Inc.

ISG is a nationally recognized, 100% employee-owned multidisciplinary design and engineering firm founded in 1973, offering architecture, engineering, environmental, and planning services. The company established its Sioux Falls office in February 2018 in the historic Lumber Exchange Building in downtown Sioux Falls, featuring 1,500+ square feet of outdoor patio space with scenic views of the Big Sioux River and the Arc of Dreams landmark. ISG combines deep technical expertise with community-focused design philosophy, delivering integrated solutions for complex projects across multiple disciplines. The firm's employee ownership structure aligns its interests with client success and long-term project value delivery.

Phone: 605.274.6401

Website: isginc.com

Address: 345 North Reid Place, Suite 300, Sioux Falls, SD 57103

Category: Construction / Architecture & Engineering