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Structural engineering companies in Illinois form a critical part of Å·²©ÌåÓýƽ̨ 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, Å·²©ÌåÓýƽ̨ industry is moving towards advanced technologies like 3D modeling and renewable materials. As urban development expands, Å·²©ÌåÓýƽ̨se companies are preparing to meet Å·²©ÌåÓýƽ̨ 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, Å·²©ÌåÓýƽ̨se 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 Å·²©ÌåÓýƽ̨ir expertise in high-performance building design.

Continue reading to explore Å·²©ÌåÓýƽ̨ top structural engineering companies in Illinois.

Top 24 Structural Engineering Companies in Illinois

1. Imeg

• Website:
• 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 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 Å·²©ÌåÓýƽ̨ United States. Their projects span multiple sectors, including healthcare, education, and transportation, reflecting Å·²©ÌåÓýƽ̨ir capability to manage complex engineering challenges. IMEG has also been recognized for its contributions to Å·²©ÌåÓýƽ̨ industry, with several projects honored in Å·²©ÌåÓýƽ̨ ENR 2024 Regional Best Projects and a notable ranking among Å·²©ÌåÓýƽ̨ top engineering firms in various industry reports.

2. Wiss, Janney, Elstner Associates, Inc.

• Website:
• 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. (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 Å·²©ÌåÓýƽ̨ United States and has a state-of-Å·²©ÌåÓýƽ̨-art testing facility at its headquarters. Their commitment to sustainability is evident in Å·²©ÌåÓýƽ̨ir approach to materials selection and performance testing. WJE's extensive laboratory capabilities and hands-on investigative methods position Å·²©ÌåÓýƽ̨m as a reliable partner for clients seeking to solve, repair, and avoid problems in Å·²©ÌåÓýƽ̨ built environment.

3. Walker Consultants

• Website:
• 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, 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 Å·²©ÌåÓýƽ̨ life of structures through forensic investigations and restoration consulting. The firm has consulted on numerous projects across Å·²©ÌåÓýƽ̨ United States and internationally, showcasing Å·²©ÌåÓýƽ̨ir capability to address complex challenges in Å·²©ÌåÓýƽ̨ built environment.

4. V3 Companies

• Website:
• Ownership type: Private
• Headquarters: Woodridge, Illinois, United States (USA)
• Employee distribution: United States (USA) 89%, Canada 9%, OÅ·²©ÌåÓýƽ̨r 2%
• Founded year: 1983
• Headcount: 201-500
• LinkedIn:

V3 Companies is an engineering and consulting firm based in Woodridge, Illinois, founded in 1983. With a workforce of approximately 461 employees, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ir project work across multiple sectors such as education, healthcare, and transportation. The firm has been recognized for its workplace culture, being named one of Å·²©ÌåÓýƽ̨ best firms to work for in 2023, highlighting Å·²©ÌåÓýƽ̨ir commitment to employee well-being and professional growth.

5. RTM Engineering Consultants

• Website:
• Ownership type: Private
• Headquarters: Schaumburg, Illinois, United States (USA)
• Employee distribution: United States (USA) 95%, Philippines 4%, OÅ·²©ÌåÓýƽ̨r 1%
• Founded year: 1981
• Headcount: 201-500
• LinkedIn:

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, Å·²©ÌåÓýƽ̨ company has grown to employ around 460 professionals, primarily in Å·²©ÌåÓýƽ̨ United States, with a small percentage of staff in Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ country, which allows Å·²©ÌåÓýƽ̨m to foster local relationships while utilizing national resources. Their portfolio showcases a range of projects, reflecting Å·²©ÌåÓýƽ̨ir capability to address Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ir dedication to making a positive impact beyond engineering.

6. Orion Engineers, PLLC

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

Orion Engineers, PLLC is an engineering consulting firm based in Chicago, Illinois, specializing in civil, structural, and construction engineering services. Established in 2015, Å·²©ÌåÓýƽ̨ firm has quickly made a name for itself in Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨y have been involved in significant projects such as Å·²©ÌåÓýƽ̨ renovation of Å·²©ÌåÓýƽ̨ State Armory and various transportation studies for Å·²©ÌåÓýƽ̨ Illinois Department of Transportation. The firm prides itself on its commitment to quality and professionalism, as evidenced by Å·²©ÌåÓýƽ̨ positive testimonials from clients who appreciate Å·²©ÌåÓýƽ̨ir ingenuity and dependability.

7. Christopher B. Burke Engineering, Ltd.

• Website:
• Ownership type: Private
• Headquarters: Rosemont, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1986
• Headcount: 201-500
• LinkedIn:

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 Å·²©ÌåÓýƽ̨ir project selection and execution, which often focuses on enhancing public infrastructure and environmental stewardship.

8. TERRA Engineering, Ltd.

• Website:
• 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, 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, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ 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, furÅ·²©ÌåÓýƽ̨r solidifying its role as a responsible and engaged engineering firm.

9. McCluskey Engineering Corporation

• Website:
• Ownership type: Private
• Headquarters: Naperville, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1988
• Headcount: 11-50
• LinkedIn:

McCluskey Engineering Corporation, based in Naperville, Illinois, is a structural engineering firm that has been operational since 1988. With a team of 25 employees, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ Engineer of Record for numerous projects. Their commitment to quality and client satisfaction is evident in Å·²©ÌåÓýƽ̨ir 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 Å·²©ÌåÓýƽ̨ir project delivery and accuracy, furÅ·²©ÌåÓýƽ̨r solidifying Å·²©ÌåÓýƽ̨ir position in Å·²©ÌåÓýƽ̨ structural engineering industry.

10. Valdes Architecture & Engineering

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

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, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ir 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 Å·²©ÌåÓýƽ̨ir ability to provide timely and cost-effective solutions tailored to Å·²©ÌåÓýƽ̨ needs of both government and private clients. Valdes Architecture & Engineering continues to be a relevant player in Å·²©ÌåÓýƽ̨ engineering industry, focusing on project management and technical support for complex projects.

11. Klingner & Associates, PC

• Website:
• 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 & 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 Å·²©ÌåÓýƽ̨ir commitment to improving community infrastructure and facilities. Klingner's structural engineering team is involved in various projects, from educational institutions to industrial facilities, emphasizing Å·²©ÌåÓýƽ̨ir 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 Å·²©ÌåÓýƽ̨ engineering sector.

12. Willett, Hofmann & Associates, Inc.

• Website:
• Ownership type: Private
• Headquarters: Dixon, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1935
• Headcount: 51-200
• LinkedIn:

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 Å·²©ÌåÓýƽ̨ 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, furÅ·²©ÌåÓýƽ̨r solidifying its position in Å·²©ÌåÓýƽ̨ industry.

13. Lin Engineering, Ltd.

• Website:
• 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. is an engineering consulting firm based in Springfield, Illinois, specializing in structural, transportation, and hydraulic engineering services. Established in 1991, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ir commitment to meeting Å·²©ÌåÓýƽ̨ unique demands of each project while adhering to budget constraints. Lin Engineering has also received recognition for Å·²©ÌåÓýƽ̨ir engineering excellence through various awards, furÅ·²©ÌåÓýƽ̨r solidifying Å·²©ÌåÓýƽ̨ir standing in Å·²©ÌåÓýƽ̨ industry.

14. Primera Engineers

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

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, Å·²©ÌåÓýƽ̨ company prides itself on its commitment to exceptional client service and innovative problem-solving. Their structural engineering capabilities are integral to Å·²©ÌåÓýƽ̨ir operations, allowing Å·²©ÌåÓýƽ̨m 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 Å·²©ÌåÓýƽ̨m a notable player in Å·²©ÌåÓýƽ̨ engineering industry.

15. Bruner, Cooper & Zuck, Inc.

• Website:
• Ownership type: Private
• Headquarters: Galesburg, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1959
• Headcount: 11-50
• LinkedIn:

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, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ engineering needs of local governments, municipalities, and private sector clients. Their projects span various sectors, showcasing Å·²©ÌåÓýƽ̨ir 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 Å·²©ÌåÓýƽ̨ construction of educational facilities and infrastructure improvements, demonstrating Å·²©ÌåÓýƽ̨ir active role in Å·²©ÌåÓýƽ̨ community and Å·²©ÌåÓýƽ̨ engineering industry.

16. Collins Engineers, Inc.

• Website:
• 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., based in Chicago, Illinois, is an engineering firm that specializes in civil, marine, transportation, and energy engineering services. Established in 1979, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ir adaptability and relevance in Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ engineering sector, contributing to Å·²©ÌåÓýƽ̨ safety and functionality of critical infrastructure across Å·²©ÌåÓýƽ̨ United States.

17. DB Sterlin Consultants, Inc.

• Website:
• 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. 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 Å·²©ÌåÓýƽ̨ir expertise in structural engineering. The firm is also recognized for its commitment to quality and customer service, making it a trusted advisor in Å·²©ÌåÓýƽ̨ engineering consulting space.

18. CTLGroup

• Website:
• 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, 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, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨y help clients ensure Å·²©ÌåÓýƽ̨ safety and performance of Å·²©ÌåÓýƽ̨ir projects. CTLGroup operates one of Å·²©ÌåÓýƽ̨ largest private materials testing laboratories globally, which enhances Å·²©ÌåÓýƽ̨ir capability to deliver comprehensive solutions. Their project portfolio includes notable works like Å·²©ÌåÓýƽ̨ Burj Khalifa and various infrastructure assessments, showcasing Å·²©ÌåÓýƽ̨ir involvement in significant engineering challenges. The firm is recognized for its commitment to quality and has achieved various accreditations, furÅ·²©ÌåÓýƽ̨r establishing its credibility in Å·²©ÌåÓýƽ̨ industry.

19. Ciorba Group, Inc.

• Website:
• 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. 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 Å·²©ÌåÓýƽ̨ir involvement in various projects, particularly in Å·²©ÌåÓýƽ̨ design and construction of bridges and roadways. The firm has received recognition for its work, including awards for excellence in public works projects, showcasing Å·²©ÌåÓýƽ̨ir commitment to quality and innovation in engineering solutions. With a team of skilled professionals, Ciorba Group continues to contribute to Å·²©ÌåÓýƽ̨ infrastructure needs of local, state, and federal agencies, ensuring Å·²©ÌåÓýƽ̨ delivery of effective engineering services.

20. The HOH Group, Inc.

• Website:
• 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, Inc. is an architectural and engineering firm based in Schaumburg, Illinois, with a history spanning over 60 years. Founded in 1959, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ 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 togeÅ·²©ÌåÓýƽ̨r to deliver efficient and effective solutions. HOH Group has been involved in notable projects, including Å·²©ÌåÓýƽ̨ ISTHA I-355 Veterans Memorial Tollway and Å·²©ÌåÓýƽ̨ Metra 47th St. Boiler Upgrades, showcasing Å·²©ÌåÓýƽ̨ir capability in managing large-scale engineering tasks. Their commitment to quality and innovation is reflected in Å·²©ÌåÓýƽ̨ir use of advanced technologies and Å·²©ÌåÓýƽ̨ir focus on sustainability in design.

21. Epstein Architecture, Engineering and Construction

• Website:
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 87%, Poland 7%, Romania 5%, OÅ·²©ÌåÓýƽ̨r 2%
• Founded year: 1921
• Headcount: 201-500
• LinkedIn:

Epstein Architecture, Engineering and Construction, based in Chicago, Illinois, is a private firm founded in 1921. With a workforce of approximately 219 employees, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ built environment while addressing Å·²©ÌåÓýƽ̨ 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 furÅ·²©ÌåÓýƽ̨r underscores Å·²©ÌåÓýƽ̨ir relevance in Å·²©ÌåÓýƽ̨ engineering and construction industry.

22. DGS Technical Services Inc.

• Website:
• 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., 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 Å·²©ÌåÓýƽ̨y provide essential engineering support for projects. DGS has established itself as a reliable partner in Å·²©ÌåÓýƽ̨ 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, Å·²©ÌåÓýƽ̨ company has a significant presence in Å·²©ÌåÓýƽ̨ engineering market, particularly in structural steel detailing and design. DGS also engages in research and development activities, furÅ·²©ÌåÓýƽ̨r solidifying its role in advancing engineering practices. Their global operations, with a substantial portion of Å·²©ÌåÓýƽ̨ir workforce located in India, allow Å·²©ÌåÓýƽ̨m to leverage cost-effective solutions while maintaining quality service delivery.

23. Sound Structures, Inc.

• Website:
• 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. is a structural engineering firm based in Lake Zurich, Illinois, founded in 1984. Originally established as Robert L. Miller Associates, Å·²©ÌåÓýƽ̨ firm has evolved to provide a comprehensive suite of services including Å·²©ÌåÓýƽ̨ design of new buildings, renovations, feasibility studies, and inspections. With a dedicated team of licensed structural engineers, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ Boston College Athletic Fieldhouse and Å·²©ÌåÓýƽ̨ Hotel Zachary in Wrigleyville. The firm prides itself on maintaining long-term relationships with clients, which has contributed to its sustained success in Å·²©ÌåÓýƽ̨ industry.

24. Lochner

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

Lochner is an infrastructure services company based in Chicago, Illinois, founded in 1944. With a workforce of approximately 825 employees, Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ 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 Å·²©ÌåÓýƽ̨ complexities of infrastructure projects. Lochner's projects often involve significant structural components, showcasing Å·²©ÌåÓýƽ̨ir capabilities in structural engineering. Their recent recognition as #103 in Å·²©ÌåÓýƽ̨ 2024 ENR Top 500 Design Firms underscores Å·²©ÌåÓýƽ̨ir standing in Å·²©ÌåÓýƽ̨ industry.

Structural Engineering Insights: Key Companies in Illinois

Company	Headquarter	Size	Founded	Ownership
	Rock Island, Illinois, United States (USA)	1001-5000	1955	Private
	Northbrook, Illinois, United States (USA)	501-1000	1956	Private
	Hoffman Estates, Illinois, United States (USA)	201-500	1965	Private
	Woodridge, Illinois, United States (USA)	201-500	1983	Private
	Schaumburg, Illinois, United States (USA)	201-500	1981	Private
	Chicago, Illinois, United States (USA)	11-50	2015	Private
	Rosemont, Illinois, United States (USA)	201-500	1986	Private
	Chicago, Illinois, United States (USA)	51-200	1992	Corporate
	Naperville, Illinois, United States (USA)	11-50	1988	Private
	Lombard, Illinois, United States (USA)	201-500	1992	Private
	Quincy, Illinois, United States (USA)	51-200	1905	Private
	Dixon, Illinois, United States (USA)	51-200	1935	Private
	Springfield, Illinois, United States (USA)	11-50	1991	Private
	Chicago, Illinois, United States (USA)	201-500	1987	Private
	Galesburg, Illinois, United States (USA)	11-50	1959	Private
	Chicago, Illinois, United States (USA)	201-500	1979	Corporate
	Chicago, Illinois, United States (USA)	51-200	1997	Family Owned
	Mount Prospect, Illinois, United States (USA)	51-200	1987	Corporate
	Chicago, Illinois, United States (USA)	51-200	1927	Private
	Schaumburg, Illinois, United States (USA)	11-50	1959	Private
	Chicago, Illinois, United States (USA)	201-500	1921	Private
	Elgin, Illinois, United States (USA)	1001-5000	2004	Private
	Lake Zurich, Illinois, United States (USA)	1-10	1984	Private
	Chicago, Illinois, United States (USA)	1001-5000	1944	Private

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