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Swansea-based TWM Inc. opens new branch office in Decatur

TWM Inc. recently opened its new branch office in Decatur, Ill. (Courtesy TWM Inc.)


New location expands company’s presence in central Illinois

TWM, Inc., noted among the top 10 largest engineering and geospatial firms in the greater St. Louis area, has announced the grand opening of its newest branch office in Decatur, Ill.

This expansion marks another significant milestone in the company’s growth and outreach to accommodate a wider client base. The new branch office will enhance TWM’s core service capabilities and operations network.

“We’re thrilled about the opportunity to establish a presence in Decatur bolstering our presence in the central Illinois business community,” said Robert DeConcini, president. “This new office will allow us to more efficiently engage our existing clients while helping us forge valuable relationships with new clients in the region.”

The new Decatur location, at 2905 N. Main Street, Suite A, opened June 16 and reflects the firm’s ongoing commitment to have a strong physical presence in central Illinois and establish closer ties to local clients and communities. “We look forward to collaborating on projects with organizations, stakeholders, and other local municipalities to build meaningful partnerships and make a positive contribution in the surrounding areas,” said Derek Twente, chief operating officer.

TWM has a total of 10 office locations throughout Illinois, Missouri, and Tennessee. In Illinois, the corporate headquarters is based in Swansea, with additional branch offices in Glen Carbon, Columbia, and Peoria. In Missouri, there are offices in St. Louis, St. Charles, and Columbia. In Tennessee, TWM has offices in Franklin and Chattanooga.

About TWM, Inc.

Celebrating 77 years in business, TWM is a 100% employee-owned firm providing civil and structural engineering, land surveying, and other geospatial services. From its humble beginnings in Belleville, Ill., in 1946, TWM has grown to the successful firm it is today, with its corporate headquarters in Swansea, Ill., and now nine additional offices throughout the Midwest and Southeast. Its five primary disciplines include Transportation, Survey/Geospatial Services, Land Development, Structural, and Water Infrastructure. As a full-service engineering consultant, TWM prides itself on being able to provide a broad range of design projects and related services, while delivering on its company mission of “Exceptional Service. Nothing Less.” Learn more about TWM at

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