ISG Offices

Architecture + Engineering Services in Sioux Falls, SD

345 North Reid Place
Suite 300
Sioux Falls, SD 57103
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ISG Sioux Falls
1,500+ square feet of outdoor patio space, with views of the Big Sioux River and the Arc of Dreams landmark sculpture, is ideal for a game of bags, outdoor meetings, or happy hour.

In The Community

ISG Celebrates 50th Anniversary + New Sioux Falls Office Grand Opening

In 2023, ISG celebrates its 50th anniversary milestone. An architecture, engineering, environmental, and planning firm, ISG has 13 offices positioned throughout the Midwest and serves clients nationwide. Throughout the year, ISG hosted a series of anniversary events to show our appreciation for the communities, clients, partners, and employee owners who have supported the mission of making a difference.

Press Releases

Meet Project Management Group Leader Tiara Marcus

Based in the Sioux Falls office, Project Management Group Leader Tiara Marcus has been a part of the ISG team for over a year. With her engineering background and hands-on experience, she brings an in-depth knowledge of best practices and efficiencies for project teams.

Employee Owners

Meet ISG President David Doxtad

For over a decade, David has served as one of ISG’s empowering leaders. As President, he strives to find opportunities for his fellow employee owners, encouraging them to grow into leaders and elevate their experience and success at ISG. Read on to learn more about David’s journey into the industry, his favorite aspects of ISG, and a bit about life in Sioux Falls, South Dakota.

Employee Owners

Featured Projects

No matter the project, we are here for it. Our partnerships and client relationships are a testament to the projects we have designed with our clients. Take a look!

Work with us

We are always up for a challenge! Reach out to ISG to start a discussion and experience the difference our all-in mentality brings to your next project.