15 Largest Engineering Companies In The United States

By Abby McCain
May. 27, 2021
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While they may not be household names, engineering companies are working behind the scenes to make the world’s buildings, infrastructure, and parks beautiful and reliable.

From civil engineering to electrical engineering, many of these companies provide various services to their clients. Here’s a list of the top 15 largest engineering companies in the U.S., ranked according to their annual revenue for 2020.

15 Largest Construction Engineering Companies in the United States

  1. Tetra Tech. Pasadena, California

    Estimated 2021 Revenue: $3.21 billion

    Tetra Tech is a consulting and engineering firm that serves both government and commercial customers. The company has 20,000 employees around the world and made $3.1 billion in revenue in 2020.

    Tetra Tech’s High Performance Buildings Group comprises Tetra Tech’s companies Cosentini, Glumac, Norman Disney and Young, and Tetra Tech’s government services group.

    This group offers consulting and engineering services to its government and commercial clients worldwide to help them make their buildings more sustainable. Tetra Tech High Performance Buildings Group earned $250 million in revenue in 2020.

    Some of the group’s projects include the International Towers in Sydney, the Shanghai headquarters for Johnson Controls, and a COVID-19 surge patient care facility in New Jersey.

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  3. Arup Group. New York, New York

    Estimated 2021 Revenue: $2.072 billion

    Arup Americas began in 1985 and is based in New York. It provides structural engineering, planning, and design consulting services to its clients who operate in everything from education to the government to retail.

    The company has 11 offices and over 1,000 employees in the U.S. alone.

    Some notable projects include the Fermilab Integrated Engineering Research Center (a leading particle physics laboratory) in Illinois, an environmentally friendly Kaiser Permanente healthcare facility in California, and a Long Island waterfront park in New York City called Hunter’s Point South.

    Arup Americas is a part of the Arup Group. Based in London, the Arup Group is a professional services firm that provides engineering, architecture, design, planning, and project management consulting services for building projects worldwide.

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  5. WSP USA. New York, New York

    Estimated 2020 Revenue: $463.21 million

    WSP USA is a subsidiary of WSP Global, a Canadian engineering professional services firm. WSP USA is based in New York, New York, and provides engineering and consulting services for clients’ transportation, infrastructure, building, water, energy, and environmental needs.

    The company has been in the U.S. for over 100 years and was formerly WSP | Parsons Brinckerhoff. It has 100 offices and 7,000 employees in the U.S. alone.

    Some of the company’s most notable projects include the bullet train that will connect Dallas and Houston, the National Museum of African American History and Cultures, and an underwater tunnel to connect Norfolk, Virginia, to Portsmouth, Virginia.

  6. Terracon. Olathe, Kansas

    Estimated 2020 Revenue: $292.68 million

    Terracon was founded in 1965 and is an employee-owned consulting engineering firm specializing in facilities, geotechnical, materials engineering, and environmental assessment.

    Terracon uses its expertise to serve a wide variety of markets, including agriculture, aquatics, commercial, healthcare, oil and gas, transportation, and infrastructure.

    The company has over 5,000 employees in more than 150 locations across the country. Terracon also has 27 companies under its umbrella.

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  8. Langan Engineering Environmental. Parsippany, New Jersey

    Estimated 2021 Revenue: $250.0 million

    Founded in 1970, Langan offers engineering and environmental consulting services to developers, property owners, public agencies, corporations, institutions, and energy companies.

    Langan has 20 offices in 13 states. Some of its most notable projects include One Vanderbilt in New York City, Mercedes-Benz Stadium in Atlanta, and the New York University Bioengineering Institute Center.

    Langan has one subsidiary, Langan International. This company is headquartered in New York and has six international offices. Langan International’s list of projects includes Skyview 456 in Dubai, Nine Elms Square in London, and Serena del Mar in Columbia.

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  10. Jensen Hughes. Baltimore, Maryland

    Estimated 2021 Revenue: $213.7 million

    Like the others on this list, Jensen Hughes is an engineering and consulting services company, but its main focus is on fire protection engineering, forensic engineering, and security.

    The company is headquartered in Maryland, but it has offices across the United States, Canada, Europe, the Middle East, and Asia.

    Jensen Hughes serves clients in many industries, including aviation, commercial, healthcare, manufacturing, and nuclear power. The company has over 1,400 employees and has completed over 40,000 projects worldwide since it started in 1980.

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  12. IMEG Corp. Rock Island, Illinois

    Estimated 2020 Revenue: $189.82 million

    IMEG Corp. offers engineering and design consulting for its clients’ facility and infrastructure needs. The company prioritizes sustainability and efficiency in its designs and, as a result, is known as one of the greenest design firms in the world.

    IMEG Corp. has 52 locations in the U.S. and two in India. Its projects include a new Olathe West High School in Olathe, Kansas, new trailheads in Minnesota, and the renovation and expansion of the Denver Broncos headquarters.

  13. KPFF Consulting Engineers. Seattle, Washington

    Estimated 2020 Revenue: $185.09 million

    KPFF provides structural engineering, civil engineering, specialty engineering, protective design, surveying, and forensics services. It works on ports and waterfront projects, roads and bridges, transit systems, and utility infrastructure projects.

    Founded in 1960, KPFF has 22 locations across the U.S. Some of its most notable projects include the future Pacific Gateway building in San Diego, the U.S. Land Port of Entry Alexandria Bay in New York, and the World Surf League Wave Company (WSLWC) Surf Ranch in California.

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  15. Affiliated Engineers. Rockville, Maryland

    Estimated 2020 Revenue: $150.86 million

    AEI is an engineering consulting and leadership company that offers its expertise to clients throughout the project planning, design, construction, and operation processes.

    In addition to its consulting services, AEI provides process engineering, commissioning, building systems engineering, technical planning, thermal utilities, and electric power services.

    AEI has over 700 employees in 19 different offices across the U.S. and U.K. Some of its most accomplishments include the Stanford University Energy Systems Innovations building, an Energy Systems Integration Facility for the U.S. Department of Energy, and the Ann Robert H. Lurie Children’s Hospital of Chicago.

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  17. Henderson Engineers. Lenexa, Kansas

    Estimated 2020 Revenue: $125.79 million

    Henderson Engineers is known for its mechanical, electrical, and plumbing engineering services. Still, it also works in acoustics, architectural lighting, broadcast services, fire and life safety, security, refrigeration, sustainability, and more.

    Henderson Engineers was founded in 1970. Since then, it has completed over 80,000 projects. The company has over 800 employees working in 11 offices across the U.S.

    Some of Henderson Engineers’ most notable projects include the Dallas Cowboys’ Ford Center Stadium and Training Facility, Nike Factory, Sam’s Club, Burberry, and Cartier stores, Sprouts Farmers Markets, Walmart Neighborhood Markets, and NASA’s Dryden Research Center.

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  19. Vanderweil Engineers. Boston, Massachusetts

    Estimated 2020 Revenue: $118.47 million

    Founded in 1950, Vanderweil Engineers is an engineering firm specializing in mechanical, electrical, plumbing, fire protection engineering, power generation, technology design, transmission and distribution, sustainable design, building commissioning, and energy audits.

    Vanderweil Engineers has 400 employees and operates out of nine offices across the U.S. Its clients work in a wide variety of industries, including healthcare, commercial, hospitality and gaming, and science and technology.

    Some of Vanderweil Engineers’ projects include buildings for the Boston Symphony Orchestra, the International Spy Museum in Washington, D.C., Google Inc.’s offices in Cambridge, Massachusetts, and the Venetian Resort Hotel Casino in Las Vegas, Nevada.

  20. Olsson. Lincoln, Nebraska

    Estimated 2020 Revenue: $114.54 million

    Olsson is an engineering and design firm with over 1,000 employees in 30 offices across the U.S. The company started in 1956, and its first project was a plot of a cemetery that cost the customer only $56.

    Olsson now offers a wide variety of planning and design, environmental, technology, and engineering services. Its engineering offerings include civil, electrical, mechanical, and structural engineering.

    Olsson was a part of projects such as A Gathering Place in Tulsa, Oklahoma, Mercy Hospital in Joplin, Missouri, and the George W. Bush Presidential Center in Dallas, Texas.

  21. Walter P Moore. Houston, Texas

    Estimated 2020 Revenue: $112.32 million

    Walter P Moore offers transportation, civil, construction, water resources, and structural engineering in addition to traffic, ITS, and transportation planning, technology consulting, restoration and renovation, parking, security, and forensic analysis services.

    Walter P Moore started in 1931 designing foundations for a pricey Houston neighborhood. In 1965, the company worked on the Astrodome, the first major domed sports stadium in the world.

    Now, the company has 21 U.S. and five international offices, as well as over 1,000 employees. It’s worked on projects such as the First City Tower in Houston, Texas, the Louis Armstrong New Orleans International Airport, and the King Abdullah Petroleum Studies and Research Center in Saudi Arabia.

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  23. Simpson Gumpertz Heger. Waltham, Massachusetts

    Estimated 2020 Revenue: $111.84 million

    Simpson Gumpertz Heger works to design, investigate, and rehabilitate building enclosures, structures, and materials.

    The company was founded in 1956 by three Massachusetts Institute of Technology professors. Now, SGH has 500 employees who work in seven offices around the U.S. to complete projects in over 30 countries.

    SGH is known for its investigation and understanding of the causes of structural failure. One of its major projects in this arena was analyzing the problem with the John Hancock Tower in Boston when the glass from its windows started falling to the ground during the 70s.

    The company serves clients in the energy, civil, infrastructure, science, and defense industries.

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  25. Syska Hennessy Group. Dallas, Texas

    Estimated 2020 Revenue: $107.27 million

    Founded in 1928, Syska Hennessy Group is an engineering firm that offers mechanical, electrical, and plumbing (MEP), information and communication technology (ICT), and commissioning services. It has both government and commercial clients, which it serves through its 18 offices and 500 professionals around the globe.

    Syska Hennessy Group works in a wide variety of sectors. Its projects include the Scottsdale Museum of the West in Arizona, O’Hare Global Terminal in Chicago, and the Empire State Building observatory in New York City.

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Abby McCain

Abby is a writer who is passionate about the power of story. Whether it’s communicating complicated topics in a clear way or helping readers connect with another person or place from the comfort of their couch. Abby attended Oral Roberts University in Tulsa, Oklahoma, where she earned a degree in writing with concentrations in journalism and business.

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