Engineering consulting companies in Illinois provide a wider range of services. Spanning the development of infrastructure, energy solutions, and advanced technologies, these businesses engage in innovative design practices and contribute significantly to industry sectors. They offer technical expertise, design services, and consulting in various areas such as energy, transportation, healthcare, and more. With the continuous growth and emphasis on sustainability in the field, these companies remain at the forefront of engineering services, offering effective solutions and advancements for future needs.


Top 19 engineering consulting companies in Illinois

1. IMEG Corp

  • Website: imegcorp.com
  • Headquarters: Rock Island, Illinois, United States
  • Founded: 1955
  • Headcount: 1001-5000
  • LinkedIn

IMEG Corp is a leading engineering design firm offering comprehensive technical expertise and collaborative partnerships. They provide services in building design, performance optimization, consulting, infrastructure design, and process engineering. With a focus on sustainability and innovation, IMEG serves various industries including arts and culture, automotive R&D, healthcare, transportation, and more. Their team of experts works closely with clients to understand their needs and navigate regulatory challenges for complex projects.


2. EN Engineering

  • Website: enengineering.com
  • Headquarters: Warrenville, Illinois, United States
  • Founded: 2002
  • Headcount: 1001-5000
  • Latest funding type: Acquired
  • LinkedIn

Enengineering.com is a company that offers engineering and technical services to various industries. With a focus on innovation and quality, they provide solutions for complex engineering challenges. Their expertise includes designing, analyzing, and implementing advanced systems and technologies.


3. Sargent & Lundy

Sargent & Lundy is a global leader in power and energy with expertise in grid modernization, renewable energy, energy storage, nuclear power, and fossil fuels. They offer comprehensive project services, including consulting, design, and implementation, as well as construction management, commissioning, and operations/maintenance.


4. Lochner

  • Website: hwlochner.com
  • Headquarters: Chicago, Illinois, United States
  • Founded: 1944
  • Headcount: 501-1000
  • LinkedIn

H.W. Lochner, Inc. is an established engineering firm specializing in surface transportation, rail, transit, and aviation markets. With a legacy of trust, collaboration, and innovation, we provide planning, environmental, design, construction engineering, and inspection services. Our comprehensive suite of offerings includes alternative delivery solutions, right of way services, and performance-driven design. We are dedicated to transforming challenges into opportunities for our clients, delivering exceptional work on time and on budget.


5. Collins Engineers, Inc.

Collins Engineers provides design and inspection services for marine facilities and infrastructure, as well as waterfront structures. They specialize in offering expertise in transportation projects and practical solutions for civil and structural engineering needs. With a focus on commercial, industrial, municipal, institutional, and residential markets, Collins Engineers offers civil/site engineering services. They also provide specialized inspection services and expertise in underwater imaging and underwater bridge inspection. Collins Engineers is committed to delivering client satisfaction through their engineering services.


6. Hanson Professional Services Inc.

  • Website: hanson-inc.com
  • Headquarters: Springfield, Illinois, United States
  • Founded: 1954
  • Headcount: 501-1000
  • LinkedIn

Hanson Professional Services Inc. is an engineering, planning, and allied services company that provides a range of construction and project delivery solutions. They are thought leaders in the industry and offer services in engineering, commissioning, energy planning, land acquisition, environmental consulting, and more.


7. Manhard Consulting

  • Website: manhard.com
  • Headquarters: Lincolnshire, Illinois, United States
  • Founded: 1972
  • Headcount: 201-500
  • LinkedIn

Manhard Consulting is a full-service civil engineering and surveying firm serving public and private clients nationwide. With office locations across the US, they offer a wide range of services including civil engineering, surveying, municipal services, water resources management, construction management, landscape architecture, and more.


8. Engineering Systems Inc. (ESi)

  • Website: engsys.com
  • Headquarters: Aurora, Illinois, United States
  • Founded: 1987
  • Headcount: 201-500
  • LinkedIn

ESi is a consultancy firm specializing in various areas such as biomechanics, safety, electrical and electronics, materials science, and structures. They offer expert analysis, testing, and investigations to help clients address complex technical problems. With a focus on practical experience and actionable insights, ESi combines expertise in multiple industries to provide solutions for clients' needs.


9. Greeley and Hansen

  • Website: greeley-hansen.com
  • Headquarters: Chicago, Illinois, United States
  • Founded: 1914
  • Headcount: 201-500
  • Latest funding type: Acquired
  • LinkedIn

Greeley and Hansen is an environmental engineering company that specializes in providing sustainable solutions for water and wastewater management. They offer engineering, consulting, and design services for various projects.


10. Baxter & Woodman

Baxter & Woodman Consulting Engineers is a company that offers a wide range of services including transportation, construction, spatial technology, water resources, wastewater, and natural resources. They specialize in SCADA/Automation, design-build, survey, and structural projects.


11. Primera Engineers

Primera is a full-service engineering design and consulting firm that offers integrated business consulting services tailored to clients' specific needs. They provide engineering and design services for a variety of structures and systems, including mechanical, electrical, plumbing, structural, civil, and telecommunications engineering. Primera's expertise also includes commissioning, energy, architecture, sustainability, life safety, lighting, transportation, natural gas, power delivery, project and construction management, and business consulting services.


12. Weaver Consultants Group

  • Website: wcgrp.com
  • Headquarters: Chicago, Illinois, United States
  • Founded: 1991
  • Headcount: 201-500
  • LinkedIn

Weaver Consultants Group is a privately held consulting firm offering multi-disciplinary engineering services. They provide personalized, pragmatic yet innovative project management and development solutions to help clients stay within scope while delivering on expectations.


13. DMC Engineering

  • Website: dmcinfo.com
  • Headquarters: Chicago, Illinois, United States
  • Founded: 1996
  • Headcount: 51-200
  • LinkedIn

DMC is an engineering and IT consulting company that provides software solutions, automation services, and custom hardware engineering for various industries.


14. Christopher B. Burke Engineering - Chicagoland

  • Website: cbbel.com
  • Headquarters: Rosemont, Illinois, United States
  • Founded: 1986
  • Headcount: 201-500
  • LinkedIn

CBBEL is a full-service consulting engineering and surveying firm specializing in civil, transportation/highway, municipal, traffic, construction observation, water resources, environmental, structural and mechanical engineering.


15. CTLGroup

  • Website: ctlgroup.com
  • Headquarters: Skokie, Illinois, United States
  • Founded: 1987
  • Headcount: 51-200
  • LinkedIn

CTLGroup is a multidisciplinary engineering, architecture, and materials science consulting firm. With over 100 years of experience, we serve customers in various industries including buildings, energy & resources, insurance, litigation, manufacturing, materials, oil & petrochem, rail, transportation, and water resources.


16. GSG Consultants, Inc.

GSG Consultants, Inc. is a well-established engineering firm offering a wide range of services including geotechnical, environmental, construction management, natural resources, design services, and program management.


17. Rrj Inc

  • Website: rrj.com
  • Headquarters: Oak Lawn, Illinois, United States
  • Founded: 1966
  • Headcount: 51-200
  • LinkedIn

RRJ is a respected forensic building consultancy firm that specializes in building enclosure consulting, engineering solutions, and laboratory and field testing. With over 30 years of experience, our team of engineers and architects provides expertise in the design, construction, and rehabilitation of building enclosures. We offer services such as construction consulting, litigation consulting, investigation, historic renovation, condition assessment, repair and renovation, design failure analysis, and design and peer review.


18. Ingenium Technologies

Ingenium Technologies is a leading engineering services organization that provides outsourcing, consulting, and staffing solutions. They offer a full range of design, analysis, development, integration, software, and technical writing expertise for components and systems. With over 50 professionals and an average experience of 25 years, they serve military and commercial aerospace sectors, as well as non-aerospace sectors like medical and land vehicles. Their customers include the US DoD, OEMs, and tiered companies.


19. Productive Resources LLC

PR-Engservices is an engineering services firm that offers a wide range of services in support of product development, manufacturing, and downfield product support. They specialize in mechanical design, virtual and physical validation, electrical system integration, and embedded solutions.


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