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Clayco provides full-service, design-build solutions to clients across North America with easy access from coast to coast and is headquartered in Chicago.

Visit our People page for information on how to contact members of our Clayco team.

Our offices are home to a diversely talented team of individuals who are held to the highest standards in the industry. We have assembled a team that exemplifies the values that have helped make Clayco what it is today. We have a passionate, high-energy, collaborative atmosphere that makes Clayco one of the “Best Places to Work” in Illinois and the St. Louis region.

Our offices provide full-service building solutions to deliver outstanding results on projects for all of the industries we serve. Whether it’s a new state-of-the-art computing facility at University of Illinois, a 2.5 million-square-foot distribution facility for Amazon or Centene’s new corporate headquarters, we deliver on the promise we make to our clients.

Find out more about how our design-build solutions can help you.

Subcontrators and Vendors
If you would like to submit your vendor/subcontractor prequalification, please see our Prequalification page.

General Questions and Comments
If you have general comments or questions about Clayco, please contact Steve Sieckhaus at [email protected].

Media Inquiries
If you have media inquires for Clayco, please contact Sarah Green at [email protected].

Diversity & Inclusion
For St. Louis & Nationwide, contact Sandra Marks at [email protected]. For Chicago, contact Sam Boynes at [email protected].



2199 Innerbelt Business Center Drive Overland, MO 63114 p: +1 314-429-5100
 f: +1 314-429-3137


7800 Forsyth Blvd Suite 300 Clayton, MO 63105 p: +1 314-429-5100
 f: +1 314-429-3137


35 East Wacker Drive Suite 1300 Chicago, IL 60601 p: +1 312-658-0747
 f: +1 314-890-7528

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