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No. 20 · ENR Top 400 Contractors 2026

Clayco

Clayco, listed in Chicago, Illinois, ranks No. 20 on the 2026 ENR Top 400 Contractors list.

Who is Clayco?

On the ENR Top 400 Contractors list for 2026, published by Engineering News-Record, it ranks No. 20.

You can find Clayco at 35 East Wacker Drive, Suite 1300, Chicago, IL 60601. The phone number on record is (314) 429-5100. More about the company is on its website, claycorp.com.

Clayco is one of 27 construction companies we list in Chicago. Before you hire any contractor in Illinois, check the license with the Illinois Department of Financial and Professional Regulation.

What does Clayco say about its work?

Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the highest quality solutions on time, on budget, and above and beyond expectations.

In the company's own words, from claycorp.com, read October 2026.

Where is Clayco located?

Clayco is at 35 East Wacker Drive, Suite 1300, Chicago, IL 60601.

How big is Clayco?

Clayco ranks No. 20 on the ENR Top 400 Contractors list for 2026. Engineering News-Record ranks the largest U.S. contractors by construction revenue.

Source: ENR Top 400 Contractors (2026), Engineering News-Record

How do I check Clayco's contractor license?

Search the Illinois Department of Financial and Professional Regulation for Clayco before you hire. We do not hold license records for individual companies. Illinois licenses selected trades, such as roofing, at the state level. General contractor licensing is handled by cities and counties.

Check a license in Illinois

Licensing rules checked October 2026. Requirements change, so confirm on the state site.

What other construction companies are in Chicago?

We list 27 construction companies in Chicago. Here are 8 more.

All construction companies in Chicago
FAQ

Clayco: FAQs

Where is Clayco located?

Clayco is at 35 East Wacker Drive, Suite 1300, Chicago, IL 60601.

What does Clayco say about its work?

On claycorp.com, Clayco describes itself like this: "Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the highest quality solutions on time, on budget, and above and beyond expectations."

How do I contact Clayco?

Call (314) 429-5100. Visit claycorp.com. The office is at 35 East Wacker Drive, Suite 1300, Chicago, IL 60601.

How big is Clayco?

Clayco ranks No. 20 on the ENR Top 400 Contractors list for 2026. Engineering News-Record ranks the largest U.S. contractors by construction revenue.

Is Clayco licensed?

We do not hold license records for individual companies. Illinois licenses selected trades, such as roofing, at the state level. General contractor licensing is handled by cities and counties. Search the Illinois Department of Financial and Professional Regulation to check a contractor before you hire.

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Office locations © OpenStreetMap contributors, available under the Open Database License. Company rankings from the ENR Top 400 Contractors (2026).

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