- Collins Engineers, Inc. (CEI)
 - Chicago - Specialises in underwater inspection, bridge design and water studies. - Greeley and Hansen
- Chicago - An environmental engineering firm specialising in water and wastewater engineering, provides solutions on water resources issues and air quality management.
- Halvorson Kaye Structural Engineers
- Chicago - Offers comprehensive structural engineering services on a wide range of projects to public and private clients worldwide. Located in Chicago, Illinois.
- HMG Group Engineers
- Libertyville - Provides services in environmental, energy, and civil engineering.
- Joseph A. Schudt & Associates
- Frankfort
- Klein and Hoffman, Inc.
- Chicago - Specialising in the restoration and rehabilitation of building facades and structural systems.
- Kudrna & Associates, Ltd.
- Chicago - A civil engineering firm.
- Manhard Consulting, Ltd.
- Vernon Hills - Provides civil engineering, surveying, and planning services to developers, design/build clients, and governmental agencies.
- Mostardi Platt Associates, Inc.
- Elmhurst - Offering services in compliance management, permitting, assessment, air testing, and continuous emissions monitoring.
- Tylk, Gustafson & Associates, Inc.
- Chicago - Consulting structural engineers.
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