1623 Greenwood Avenue
Michigan City, IN 46360
Phone: 800-871-1555
Fax: (219) 873-0210
Central Indiana Office
5721 Progress Road
Indianapolis, IN 46241
Phone: (317) 423-1020
Fax: (317) 423-1055
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about us

Since it was founded in 1922, Tonn and Blank has built a long history of quality,
innovation, and trusted partnerships


  • 1922
    Tonn and Blank Construction Company founded in Michigan City, Indiana, as a partnership between C.W. Tonn and J.G. Blank.
  • 1929
    Incorporated in the State of Indiana


  • 1936 - Present
    We began offering customers value-added capabilities to complement our core construction business. We are constantly educating ourselves on the latest in construction technology, staying on top of what's up and coming in the industry, expanding our capabilities, and enhancing our services.

    We are dedicated to our clients and are grateful for the long-term relationships and the mutual loyalties we've developed with them over the years. We'll continue to do whatever is necessary to build on that foundation, remaining a trusted partner in every construction endeavor.

We build some of the best-looking, best-functioning structures in Indiana and the Midwest.

what we do

Tonn and Blank is a leading building construction company headquartered in Michigan City, Indiana, and serving the entire Midwest region. We offer decades of expertise in managing all aspects of construction services, from pre-planning to complete, design-build project delivery.

our diverse team specializes in:

  • Manufacturing construction
  • Healthcare construction
  • Government construction
  • Sustainable building construction
  • Commercial and industrial construction
  • Bridge construction

At Tonn and Blank, we believe in acting as true partners to you for the duration of your construction project.

we are...

  • financially stable
  • dedicated to providing superior service that sets us apart from other firms
  • LEED-credentialed and committed to sustainable construction
  • the only contractor you need to manage your project from concept to completion

our mission

As a licensed general contractor, Tonn and Blank works to not only meet, but to exceed your expectations. We understand your concerns when taking on a new construction project – and our goal is to alleviate those worries and ensure that your project goes as smoothly as possible.

From our front-end building design review and enhancement services, to virtual design and construction with our Building Information Modeling service, through the ribbon-cutting ceremony, we're always at your service.

We've already partnered with clients across the Midwest, from Chicago and Indianapolis to smaller communities like Fort Wayne, Indiana. Whatever your project, and no matter the size and scope, Tonn and Blank is the general contractor of choice.

Tonn and Blank has long been recognized as a premier Midwest contractor.

Tonn and Blank finds rewards in every project we complete – but we’re always honored to receive building construction industry accolades, too. In recent years, we’ve been recognized by:

Engineering News-Records (ENR)

2009 and 2010 – Ranked among the Top 400 General Contractors in the United States

The Construction Advancement Foundation (CAF)

2010 – Best Commercial Project Award for our work as general contractors on construction of the Valparaiso YMCA.
2009 – Best Commercial Project Award for our role as general contractor and project manager for Saint Anthony Medical Center’s Franciscan Point medical complex, a state-of-the-art 85,000-square-foot complex

We understand the importance of community.

At Tonn and Blank, it just isn’t enough to do exceptional work for exceptional clients. It’s important to make a positive impact on the communities we serve.

As corporate citizens, we are especially proud of our service through the Dunebrook Child Abuse Prevention and Parent Resource Center. With a little help from Tonn and Blank, our friends at Dunebrook have grown their child advocacy and parent resource center to serve as many as 300 families each month.

The organization advocates for children, and provides education and tools for parents, to help ensure that they can provide safe, healthy, happy homes that prepare their children for success.

Tonn and Blank employees donated not only their time, but the materials as well to turn Dunebrook’s 2,400-square-foot building into a 12,000-square-foot facility that offers a warm welcome to families and provides a relaxing environment in which to address challenging situations.

Community Involvement: