Structural engineering companies in Illinois form a critical part of the construction ecosystem, providing essential design and consulting services that ensure safe and efficient building practices. These firms tackle a range of projects from residential to commercial, often specializing in civil and structural engineering solutions. With an increasing focus on sustainability and innovation, the industry is moving towards advanced technologies like 3D modeling and renewable materials. As urban development expands, these companies are preparing to meet the demands of smarter infrastructure that prioritizes resilience and environmental impact.


This list features a variety of structural engineering firms based in Illinois, ranging from small teams of under 50 to large firms with thousands of employees. Founded between 1905 and 2015, these companies serve clients across various sectors, including healthcare, education, and transportation. Notable examples include IMEG, established in 1955, and WJE, founded in 1956, both recognized for their expertise in high-performance building design.


Continue reading to explore the top structural engineering companies in Illinois.


Top 24 Structural Engineering Companies in Illinois


1. Imeg

  • Website: imegcorp.com
  • Ownership type: Private
  • Headquarters: Rock Island, Illinois, United States (USA)
  • Employee distribution: United States (USA) 84%, India 16%
  • Founded year: 1955
  • Headcount: 1001-5000
  • LinkedIn: imeg-corp

IMEG is an engineering consulting firm based in Rock Island, Illinois, established in 1955. The company specializes in high-performance building design and infrastructure solutions, providing a wide array of services that include civil, structural, mechanical, and electrical engineering. IMEG serves a broad spectrum of clients, from government agencies to private corporations, and is committed to sustainability and performance optimization. With a workforce of approximately 1,887 employees, IMEG operates through a network of nearly 3,000 team members across various locations in the United States. Their projects span multiple sectors, including healthcare, education, and transportation, reflecting their capability to manage complex engineering challenges. IMEG has also been recognized for its contributions to the industry, with several projects honored in the ENR 2024 Regional Best Projects and a notable ranking among the top engineering firms in various industry reports.


2. Wiss, Janney, Elstner Associates, Inc.

  • Website: wje.com
  • Ownership type: Private
  • Headquarters: Northbrook, Illinois, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Founded year: 1956
  • Headcount: 501-1000
  • LinkedIn: wiss-janney-elstner-associates-inc-

Wiss, Janney, Elstner Associates, Inc. (WJE) is a professional services firm based in Northbrook, Illinois, specializing in engineering, architecture, and materials science. Established in 1956, WJE has developed a robust portfolio that includes structural engineering, forensic analysis, and materials testing. The firm serves clients across various sectors, including construction, energy, and infrastructure, providing expert consultation and innovative solutions to complex challenges. With a workforce of nearly 900 employees, WJE operates through a network of offices throughout the United States and has a state-of-the-art testing facility at its headquarters. Their commitment to sustainability is evident in their approach to materials selection and performance testing. WJE's extensive laboratory capabilities and hands-on investigative methods position them as a reliable partner for clients seeking to solve, repair, and avoid problems in the built environment.


3. Walker Consultants

  • Website: walkerconsultants.com
  • Ownership type: Private
  • Headquarters: Hoffman Estates, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1965
  • Headcount: 201-500
  • LinkedIn: walker-consultants

Walker Consultants, founded in 1965 and based in Hoffman Estates, Illinois, is a 100% employee-owned consulting firm. The company specializes in planning, engineering, architecture, and restoration services, catering to a variety of sectors including aviation, education, and healthcare. With a workforce of approximately 453 employees, Walker Consultants has established a reputation for providing expert solutions that enhance project outcomes and operational efficiency. Their services include parking design, transportation planning, and structural engineering, with a strong emphasis on extending the life of structures through forensic investigations and restoration consulting. The firm has consulted on numerous projects across the United States and internationally, showcasing their capability to address complex challenges in the built environment.


4. V3 Companies

  • Website: v3co.com
  • Ownership type: Private
  • Headquarters: Woodridge, Illinois, United States (USA)
  • Employee distribution: United States (USA) 89%, Canada 9%, Other 2%
  • Founded year: 1983
  • Headcount: 201-500
  • LinkedIn: v3-companies

V3 Companies is an engineering and consulting firm based in Woodridge, Illinois, founded in 1983. With a workforce of approximately 461 employees, the company specializes in construction management, environmental services, and municipal consulting. V3 serves a variety of clients, including developers and government agencies, focusing on land development and infrastructure projects. Their service offerings include construction engineering, ecological restoration, and notably, structural engineering. V3 is dedicated to exceeding client expectations and enhancing community outcomes, which is reflected in their project work across multiple sectors such as education, healthcare, and transportation. The firm has been recognized for its workplace culture, being named one of the best firms to work for in 2023, highlighting their commitment to employee well-being and professional growth.


5. RTM Engineering Consultants

  • Website: rtmec.com
  • Ownership type: Private
  • Headquarters: Schaumburg, Illinois, United States (USA)
  • Employee distribution: United States (USA) 95%, Philippines 4%, Other 1%
  • Founded year: 1981
  • Headcount: 201-500
  • LinkedIn: rtm-%26-associates

RTM Engineering Consultants, based in Schaumburg, Illinois, is a private engineering consulting firm that specializes in MEP, Civil, and Structural engineering services. Established in 1981, the company has grown to employ around 460 professionals, primarily in the United States, with a small percentage of staff in the Philippines. RTM serves a variety of sectors, including healthcare, education, and commercial projects, providing expertise in designing and implementing efficient building systems. The firm operates through a network of offices across the country, which allows them to foster local relationships while utilizing national resources. Their portfolio showcases a range of projects, reflecting their capability to address the unique needs of different markets. RTM is also committed to community outreach, supporting STEM education and engaging in pro bono work for nonprofits, which highlights their dedication to making a positive impact beyond engineering.


6. Orion Engineers, PLLC

  • Website: orionengineersllc.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2015
  • Headcount: 11-50
  • LinkedIn: orionengineers

Orion Engineers, PLLC is an engineering consulting firm based in Chicago, Illinois, specializing in civil, structural, and construction engineering services. Established in 2015, the firm has quickly made a name for itself in the Midwest, serving both government and industry clients. Orion Engineers focuses on project planning, design, and construction management, with a portfolio that includes work in buildings, transportation, and utilities. Their team of 24 employees is dedicated to delivering high-quality engineering solutions, and they have been involved in significant projects such as the renovation of the State Armory and various transportation studies for the Illinois Department of Transportation. The firm prides itself on its commitment to quality and professionalism, as evidenced by the positive testimonials from clients who appreciate their ingenuity and dependability.


7. Christopher B. Burke Engineering, Ltd.


Christopher B. Burke Engineering, Ltd. (CBBEL) is a consulting engineering and surveying firm based in Rosemont, Illinois, established in 1986. With a workforce of over 200 professionals, CBBEL offers a wide array of services, including civil design, construction management, environmental consulting, and notably, structural design. The firm has successfully completed numerous projects that address engineering and environmental challenges, particularly for public sector clients such as municipalities and counties. CBBEL's team includes licensed professional engineers and specialized staff, ensuring a high level of expertise across various engineering disciplines. Their commitment to sustainability and community involvement is evident in their project selection and execution, which often focuses on enhancing public infrastructure and environmental stewardship.


8. TERRA Engineering, Ltd.

  • Website: terraengineering.com
  • Ownership type: Corporate
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: June 2021
  • Founded year: 1992
  • Headcount: 51-200
  • LinkedIn: terra-engineering

TERRA Engineering, Ltd. is a woman-owned, full-service engineering firm based in Chicago, Illinois, with additional offices in Peoria, St. Louis, and Milwaukee. Founded in 1992 by Karen Steingraber and Jamil Bou-Saab, the company has grown to employ over 100 professionals across various engineering disciplines. TERRA offers a wide range of services, including construction engineering, electrical engineering, municipal engineering, and notably, structural engineering. Their structural engineering team specializes in designing steel and concrete structures, conducting assessments, and providing repair recommendations. TERRA is dedicated to delivering innovative and sustainable solutions tailored to meet the needs of municipalities and private developers. The firm has received multiple awards for its projects, reflecting its commitment to quality and excellence in engineering. TERRA's culture emphasizes continuous learning and community involvement, further solidifying its role as a responsible and engaged engineering firm.


9. McCluskey Engineering Corporation


McCluskey Engineering Corporation, based in Naperville, Illinois, is a structural engineering firm that has been operational since 1988. With a team of 25 employees, the company specializes in providing innovative engineering solutions tailored to various sectors, including commercial, healthcare, education, and municipal projects. They serve a wide array of clients, including architects, contractors, and municipalities, ensuring that construction projects meet safety standards and regulatory compliance. The firm is particularly recognized for its expertise in specialty precast design and serves as the Engineer of Record for numerous projects. Their commitment to quality and client satisfaction is evident in their long-standing relationships with repeat clients. McCluskey Engineering Corporation is licensed in 34 states, reflecting its capability to handle projects across a broad geographic area. Their use of advanced technologies, such as 3D Building Information Modeling (BIM), enhances their project delivery and accuracy, further solidifying their position in the structural engineering industry.


10. Valdes Architecture & Engineering

  • Website: valdeseng.com
  • Ownership type: Private
  • Headquarters: Lombard, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1992
  • Headcount: 201-500
  • LinkedIn: valdes-engineering-company

Valdes Architecture & Engineering, founded in 1992 and based in Lombard, Illinois, is a private firm that specializes in engineering and architectural services. With a workforce of approximately 176 employees, the company has built a reputation for delivering technical excellence across various sectors, including oil & gas, utilities, chemicals, life sciences, and transportation. Valdes is committed to safety, quality, and client satisfaction, which are central to their operations. Their structural engineering services include building frame design, seismic analysis, foundation design, and inspection of existing structures. The firm has successfully managed numerous projects, showcasing their ability to provide timely and cost-effective solutions tailored to the needs of both government and private clients. Valdes Architecture & Engineering continues to be a relevant player in the engineering industry, focusing on project management and technical support for complex projects.


11. Klingner & Associates, PC

  • Website: klingner.com
  • Ownership type: Private
  • Headquarters: Quincy, Illinois, United States (USA)
  • Employee distribution: United States (USA) 97%, Brazil 3%
  • Founded year: 1905
  • Headcount: 51-200
  • LinkedIn: klingner-%26-associates-pc

Klingner & Associates, PC is an engineering and architecture firm based in Quincy, Illinois, with a history dating back to 1905. The company employs between 51 and 200 professionals and provides a wide range of services, including architectural design, mechanical, electrical, and plumbing engineering, as well as surveying. Their clientele includes municipalities and private companies, reflecting their commitment to improving community infrastructure and facilities. Klingner's structural engineering team is involved in various projects, from educational institutions to industrial facilities, emphasizing their expertise in creating safe and efficient structures. The firm prides itself on its integrated design approach, which combines various engineering disciplines to deliver comprehensive solutions. With a focus on quality and community impact, Klingner continues to play a significant role in the engineering sector.


12. Willett, Hofmann & Associates, Inc.


Willett, Hofmann & Associates, Inc. is a professional engineering and architectural firm based in Dixon, Illinois, with a history dating back to 1935. The company specializes in a variety of engineering services, prominently featuring structural engineering, transportation engineering, water and wastewater engineering, civil site design, and land surveying. With a dedicated team of over 50 employees, including licensed structural engineers, WHA has built a reputation for delivering quality solutions to municipalities and private enterprises alike. Their projects range from the design and rehabilitation of bridges to comprehensive evaluations of existing structures. The firm is known for its commitment to ethical practices and responsiveness to client needs, which has fostered long-term relationships with many clients. WHA has also received several accolades for its engineering excellence, further solidifying its position in the industry.


13. Lin Engineering, Ltd.

  • Website: lineng.com
  • Ownership type: Private
  • Headquarters: Springfield, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1991
  • Headcount: 11-50
  • LinkedIn: lin-engineering-ltd-

Lin Engineering, Ltd. is an engineering consulting firm based in Springfield, Illinois, specializing in structural, transportation, and hydraulic engineering services. Established in 1991, the company has built a reputation for quality and compliance in infrastructure development. With a team of skilled civil, structural, hydraulic engineers, and land surveyors, Lin Engineering provides comprehensive services that include project planning, design, and inspection. They have worked extensively with government agencies and design firms, serving as both prime consultants and subconsultants. Their structural engineering work includes in-depth inspections, rehabilitation projects, and independent quality assurance reviews. The firm is prequalified in various engineering disciplines across Illinois and Iowa, reflecting their commitment to meeting the unique demands of each project while adhering to budget constraints. Lin Engineering has also received recognition for their engineering excellence through various awards, further solidifying their standing in the industry.


14. Primera Engineers

  • Website: primeraeng.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Founded year: 1987
  • Headcount: 201-500
  • LinkedIn: primera-engineers

Primera Engineers, founded in 1987 and based in Chicago, Illinois, is a private engineering firm that specializes in design and consulting services across multiple sectors, including buildings, transportation, and utilities. With a workforce of approximately 330 professionals, the company prides itself on its commitment to exceptional client service and innovative problem-solving. Their structural engineering capabilities are integral to their operations, allowing them to tackle complex projects ranging from educational institutions to healthcare facilities. As a certified women-owned business enterprise (WBE), Primera Engineers emphasizes diversity and inclusion within its workforce. The firm has established a reputation for delivering high-quality engineering solutions, supported by a robust Quality Management System that is ISO 9001:2015 certified. Their approach combines technical expertise with a focus on sustainability and community impact, making them a notable player in the engineering industry.


15. Bruner, Cooper & Zuck, Inc.


Bruner, Cooper & Zuck, Inc. is a private engineering and architecture firm based in Galesburg, Illinois, with additional offices in Burlington and Bettendorf, Iowa. Founded in 1959, the company has built a reputation for providing a comprehensive range of professional services, including civil and structural engineering, land surveying, material testing, and construction inspection. With a team of experienced engineers and architects, BCZ is dedicated to addressing the engineering needs of local governments, municipalities, and private sector clients. Their projects span various sectors, showcasing their ability to tackle engineering challenges of different sizes and complexities. The firm prides itself on its commitment to quality, ensuring that projects are completed on time and within budget. BCZ has also been involved in significant projects, such as the construction of educational facilities and infrastructure improvements, demonstrating their active role in the community and the engineering industry.


16. Collins Engineers, Inc.

  • Website: collinsengr.com
  • Ownership type: Corporate
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: January 2013
  • Founded year: 1979
  • Headcount: 201-500
  • LinkedIn: collins-engineers-inc.

Collins Engineers, Inc., based in Chicago, Illinois, is an engineering firm that specializes in civil, marine, transportation, and energy engineering services. Established in 1979, the company has built a strong foundation in providing solutions for infrastructure projects. Their services include inspection and construction support, ensuring that various structures meet safety and compliance standards. Collins Engineers caters to a wide range of clients, including contractors and government agencies, which highlights their adaptability and relevance in the industry. The firm is particularly noted for its specialized inspection services, such as underwater engineering and bridge inspections, which require a high level of technical expertise. With a workforce of over 500 employees, Collins Engineers continues to play a significant role in the engineering sector, contributing to the safety and functionality of critical infrastructure across the United States.


17. DB Sterlin Consultants, Inc.

  • Website: dbsterlin.com
  • Ownership type: Family Owned
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1997
  • Headcount: 51-200
  • LinkedIn: db-sterlin-consultants-inc.

DB Sterlin Consultants, Inc. is an engineering consulting firm based in Chicago, Illinois, founded in 1997. The company specializes in civil, structural, and utilities engineering, as well as land surveying. With a workforce of approximately 111 employees, DB Sterlin has built a reputation for adaptability and professional excellence over more than two decades. The firm serves a variety of clients, including government agencies and private utilities, providing essential services for infrastructure projects across Illinois. Their project portfolio includes notable work at Chicago O'Hare International Airport and various bridge rehabilitation projects, showcasing their expertise in structural engineering. The firm is also recognized for its commitment to quality and customer service, making it a trusted advisor in the engineering consulting space.


18. CTLGroup

  • Website: ctlgroup.com
  • Ownership type: Corporate
  • Headquarters: Mount Prospect, Illinois, United States (USA)
  • Employee distribution: United States (USA) 94%, Qatar 3%, India 3%
  • Latest funding: October 2019
  • Founded year: 1987
  • Headcount: 51-200
  • LinkedIn: ctlgroup

CTLGroup, founded in 1987 and based in Mount Prospect, Illinois, is a consulting firm that specializes in engineering, architecture, and materials science. With a workforce of around 101 employees, the company provides a wide array of services, including materials testing, forensic analysis, and structural engineering evaluations. Their expertise is particularly valuable in sectors such as construction, energy, and transportation, where they help clients ensure the safety and performance of their projects. CTLGroup operates one of the largest private materials testing laboratories globally, which enhances their capability to deliver comprehensive solutions. Their project portfolio includes notable works like the Burj Khalifa and various infrastructure assessments, showcasing their involvement in significant engineering challenges. The firm is recognized for its commitment to quality and has achieved various accreditations, further establishing its credibility in the industry.


19. Ciorba Group, Inc.

  • Website: ciorba.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1927
  • Headcount: 51-200
  • LinkedIn: ciorba-group-inc.

Ciorba Group, Inc. is an engineering consulting firm based in Chicago, Illinois, with a history dating back to 1927. The company specializes in a wide array of engineering services, including roadway, structures, construction, water resources, municipal and civil engineering, electrical and lighting, and forensic engineering. Ciorba Group serves a mix of clients, including government agencies and private sector entities, focusing on infrastructure projects that enhance community development. Their expertise in structural engineering is evident through their involvement in various projects, particularly in the design and construction of bridges and roadways. The firm has received recognition for its work, including awards for excellence in public works projects, showcasing their commitment to quality and innovation in engineering solutions. With a team of skilled professionals, Ciorba Group continues to contribute to the infrastructure needs of local, state, and federal agencies, ensuring the delivery of effective engineering services.


20. The HOH Group, Inc.

  • Website: hohgroup.com
  • Ownership type: Private
  • Headquarters: Schaumburg, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1959
  • Headcount: 11-50
  • LinkedIn: the-hoh-group

The HOH Group, Inc. is an architectural and engineering firm based in Schaumburg, Illinois, with a history spanning over 60 years. Founded in 1959, the company specializes in providing comprehensive services that include architectural design, civil engineering, and structural engineering. With a team of skilled professionals, HOH Group focuses on meeting the needs of both public and private clients across various sectors, such as transportation, healthcare, and industrial projects. Their structural engineering department is equipped to handle a wide array of projects, from bridges to complex steel structures. The firm prides itself on its collaborative approach, ensuring that architects and engineers work seamlessly together to deliver efficient and effective solutions. HOH Group has been involved in notable projects, including the ISTHA I-355 Veterans Memorial Tollway and the Metra 47th St. Boiler Upgrades, showcasing their capability in managing large-scale engineering tasks. Their commitment to quality and innovation is reflected in their use of advanced technologies and their focus on sustainability in design.


21. Epstein Architecture, Engineering and Construction


Epstein Architecture, Engineering and Construction, based in Chicago, Illinois, is a private firm founded in 1921. With a workforce of approximately 219 employees, the company specializes in providing comprehensive design and construction services. Their expertise spans architecture, civil engineering, structural engineering, and various construction services. Epstein is known for its strategic and creative project execution, which enhances the built environment while addressing the intricate needs of its clients. The firm has a notable portfolio that includes projects in sectors such as aviation, commercial, hospitality, and transportation. Their commitment to sustainability and innovative design solutions further underscores their relevance in the engineering and construction industry.


22. DGS Technical Services Inc.

  • Website: dgsts.com
  • Ownership type: Private
  • Headquarters: Elgin, Illinois, United States (USA)
  • Employee distribution: India 97%, United States (USA) 3%
  • Founded year: 2004
  • Headcount: 1001-5000
  • LinkedIn: dgs-technical-services-inc-

DGS Technical Services Inc., founded in 2004 and based in Elgin, Illinois, is an engineering services provider that specializes in structural and mechanical engineering solutions. The company offers a wide array of services, including structural steel detailing, connection design, and engineering consulting. Their clientele spans various industries such as construction, transportation, and manufacturing, where they provide essential engineering support for projects. DGS has established itself as a reliable partner in the engineering sector, with a strong emphasis on quality and customer satisfaction. The firm is certified under ISO 9001:2015, reflecting its commitment to maintaining high standards in its operations. With a workforce of over 1,000 employees, the company has a significant presence in the engineering market, particularly in structural steel detailing and design. DGS also engages in research and development activities, further solidifying its role in advancing engineering practices. Their global operations, with a substantial portion of their workforce located in India, allow them to leverage cost-effective solutions while maintaining quality service delivery.


23. Sound Structures, Inc.

  • Website: soundstructures.net
  • Ownership type: Private
  • Headquarters: Lake Zurich, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1984
  • Headcount: 1-10
  • LinkedIn: sound-structures-inc-

Sound Structures, Inc. is a structural engineering firm based in Lake Zurich, Illinois, founded in 1984. Originally established as Robert L. Miller Associates, the firm has evolved to provide a comprehensive suite of services including the design of new buildings, renovations, feasibility studies, and inspections. With a dedicated team of licensed structural engineers, the company employs advanced technology and software to deliver efficient and precise engineering solutions. Their project portfolio features a variety of sectors, including commercial, educational, healthcare, and residential projects. Noteworthy collaborations include work on the Boston College Athletic Fieldhouse and the Hotel Zachary in Wrigleyville. The firm prides itself on maintaining long-term relationships with clients, which has contributed to its sustained success in the industry.


24. Lochner

  • Website: hwlochner.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1944
  • Headcount: 1001-5000
  • LinkedIn: lochner

Lochner is an infrastructure services company based in Chicago, Illinois, founded in 1944. With a workforce of approximately 825 employees, the firm specializes in engineering and design, construction management, and environmental consulting. Lochner serves both government agencies and private sector clients, focusing on enhancing transportation and water systems across the United States. Their expertise spans various markets, including aviation, bridges and structures, highways and roads, transit and rail, and water and wastewater. The company is known for its commitment to quality and innovation, providing a full suite of services that address the complexities of infrastructure projects. Lochner's projects often involve significant structural components, showcasing their capabilities in structural engineering. Their recent recognition as #103 in the 2024 ENR Top 500 Design Firms underscores their standing in the industry.



Structural Engineering Insights: Key Companies in Illinois


CompanyHeadquarterSizeFoundedOwnership
ImegRock Island, Illinois, United States (USA)1001-50001955Private
Wiss, Janney, Elstner Associates, Inc.Northbrook, Illinois, United States (USA)501-10001956Private
Walker ConsultantsHoffman Estates, Illinois, United States (USA)201-5001965Private
V3 CompaniesWoodridge, Illinois, United States (USA)201-5001983Private
RTM Engineering ConsultantsSchaumburg, Illinois, United States (USA)201-5001981Private
Orion Engineers, PLLCChicago, Illinois, United States (USA)11-502015Private
Christopher B. Burke Engineering, Ltd.Rosemont, Illinois, United States (USA)201-5001986Private
TERRA Engineering, Ltd.Chicago, Illinois, United States (USA)51-2001992Corporate
McCluskey Engineering CorporationNaperville, Illinois, United States (USA)11-501988Private
Valdes Architecture & EngineeringLombard, Illinois, United States (USA)201-5001992Private
Klingner & Associates, PCQuincy, Illinois, United States (USA)51-2001905Private
Willett, Hofmann & Associates, Inc.Dixon, Illinois, United States (USA)51-2001935Private
Lin Engineering, Ltd.Springfield, Illinois, United States (USA)11-501991Private
Primera EngineersChicago, Illinois, United States (USA)201-5001987Private
Bruner, Cooper & Zuck, Inc.Galesburg, Illinois, United States (USA)11-501959Private
Collins Engineers, Inc.Chicago, Illinois, United States (USA)201-5001979Corporate
DB Sterlin Consultants, Inc.Chicago, Illinois, United States (USA)51-2001997Family Owned
CTLGroupMount Prospect, Illinois, United States (USA)51-2001987Corporate
Ciorba Group, Inc.Chicago, Illinois, United States (USA)51-2001927Private
The HOH Group, Inc.Schaumburg, Illinois, United States (USA)11-501959Private
Epstein Architecture, Engineering and ConstructionChicago, Illinois, United States (USA)201-5001921Private
DGS Technical Services Inc.Elgin, Illinois, United States (USA)1001-50002004Private
Sound Structures, Inc.Lake Zurich, Illinois, United States (USA)1-101984Private
LochnerChicago, Illinois, United States (USA)1001-50001944Private


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