New York’s skyline may attract the most attention, but the state’s engineering work extends far beyond skyscrapers. Subway expansions, bridges, airports, water systems, hospitals and energy-efficient buildings all depend on teams of civil, structural, mechanical, electrical and environmental engineers.
The companies below were selected for their New York presence, technical capabilities, infrastructure experience and ability to manage large or specialised projects. Some are global consultancies, while others were founded and remain headquartered in New York. Let’s check out our top picks.
1. AECOM
AECOM is one of the largest infrastructure consulting firms operating in New York. Its services include engineering, architecture and design, environmental consulting, programme management, construction management and advisory work. The company serves transportation, cities, water, energy, healthcare and government markets.
AECOM has worked on major projects in and around New York, including One World Trade Center and numerous transport and public-infrastructure programmes. Its scale allows it to bring together planners, engineers, environmental specialists and construction-management professionals for complex assignments.
The company is particularly relevant for major rail, airport, roadway, water and urban-development projects where several engineering disciplines must work under one programme. AECOM also provides digital, sustainability and resilience services.
Why AECOM is included: Its broad technical resources and experience with large public and private infrastructure projects make it one of New York’s most capable multidisciplinary consultancies.
- New York office: 2 Park Avenue, New York, NY 10016. A June 2026 report identifies AECOM as a major tenant at this address.
- Official website: https://aecom.com/
2. WSP
WSP is a global engineering and professional-services company with a substantial New York operation. Its work covers property and buildings, transportation, water, energy, environmental services, sustainability, planning and programme management.
Its building capabilities include structural engineering, mechanical and electrical systems, commissioning, building enclosures and high-rise design. Transportation services cover highways, bridges, aviation, rail, transit, tunnels and maritime infrastructure.
WSP’s official directory lists seven New York offices in Buffalo, Goshen, Horseheads, New York City, Syracuse, Troy and Valhalla. This gives it a stronger statewide footprint than firms centred only in Manhattan.
Why WSP is included: Its combination of global resources and seven New York offices makes it suitable for statewide infrastructure, building, environmental and transportation projects.
- New York City office: One Penn Plaza, 250 West 34th Street, New York, NY 10119
- Official website: https://www.wsp.com/en-us
3. STV
STV is a New York-rooted professional-services firm specialising in engineering, architecture, planning, advisory work and programme and construction management. It serves transportation systems, buildings, water facilities and other public infrastructure.
The company has operated for more than a century and now maintains more than 65 offices across North America. Its current New York headquarters is inside the Empire State Building.
STV is especially well known for transit, rail, airport and public-building assignments. Its current portfolio includes work connected with the Second Avenue Subway Phase II, demonstrating its continuing role in major New York transportation development.
Why STV is included: Its New York history and specialised knowledge of transit, rail and public infrastructure make it particularly valuable for government agencies and transportation authorities.
- New York office: Empire State Building, 350 Fifth Avenue, 10th Floor, New York, NY 10118
- Official website: https://stvinc.com/
4. Thornton Tomasetti
Thornton Tomasetti is a New York-headquartered engineering consultancy recognised for structural engineering, façade work, forensics, building renewal, resilience, protective design and applied science.
Its New York portfolio includes One Vanderbilt, 30 Hudson Yards, the World Trade Center Transportation Hub, LaGuardia Airport Terminal B, Yankee Stadium and the Barclays Center. The firm also assists property owners with New York City façade, parking-structure and emissions-compliance work.
Thornton Tomasetti is particularly suitable for technically difficult structures, tall buildings, historic renovations and investigations into structural damage or failure. Its teams also use computational modelling and advanced analysis for unusual engineering problems.
Why Thornton Tomasetti is included: Its structural, forensic and façade expertise makes it one of the strongest choices for complicated buildings and high-profile structures.
- New York headquarters: 120 Broadway, 15th Floor, New York, NY 10271-0016
- Official website: https://www.thorntomasetti.com/
5. H2M Architects + Engineers
H2M is a multidisciplinary architecture and engineering company headquartered in Melville, Long Island. Founded in New York, it has grown from a small civil-engineering practice into a firm serving communities across the East Coast.
Its engineering services include civil, structural, mechanical, electrical, environmental, fire-protection, plumbing, wastewater and drinking-water engineering. H2M also provides land surveying, planning, construction services, forensic engineering and sustainable design.
The firm works with municipalities, utilities, schools, public-safety agencies, healthcare organisations and private developers. Its experience with water supply, wastewater treatment and local government infrastructure gives it a different strength from firms focused mainly on skyscrapers or major transit projects.
Why H2M is included: Its New York headquarters and strong municipal, water, environmental and public-facility practices make it an important regional engineering company.
- Corporate headquarters: 538 Broad Hollow Road, 4th Floor East, Melville, NY 11747
- Official website: https://www.h2m.com/
Frequently Asked Questions
Q: Which engineering company is suitable for a subway or railway project?
A: AECOM, WSP and STV all have major transportation capabilities. The correct choice depends on whether the assignment requires preliminary planning, detailed design, environmental review, programme management or construction supervision.
Q: Which company is better for structural engineering?
A: Thornton Tomasetti is particularly strong in structural, façade and forensic engineering. WSP and STV also maintain building-engineering teams, while the final choice should depend on the structure’s type and technical requirements.
Q: What should an engineering proposal include?
A: A proper proposal should identify the project scope, deliverables, schedule, responsible engineers, assumptions and fee structure. It should also explain additional-service charges, insurance, site investigations and responsibility for permits or agency submissions.
Q: Is an engineering company the same as a construction contractor?
A: No. An engineering consultant normally plans, analyses and prepares technical designs. A contractor supplies labour, materials and equipment to build the project. Some firms provide construction management, but this does not always mean they perform the physical construction.
Q: How can a client verify a New York professional engineer?
A: The New York State Education Department’s Office of the Professions regulates professional licences, including engineering. Clients should search for the engineer’s name and confirm that the licence is active.