What Thornton Tomasetti does

Thornton Tomasetti is a 100% employee-held engineering consulting firm founded in 1949 and headquartered at 120 Broadway, New York. The firm provides structural engineering design, investigation, analysis, forensics, sustainability, and decarbonization services across the built environment, with approximately 1,900 professionals serving clients in 150+ countries through 40+ offices spanning North America, Asia-Pacific, Europe, Latin America, and the Middle East. Its portfolio includes landmark projects such as Jeddah Tower, 10 Hudson Yards, Battersea Power Station, the Under Armour Global Headquarters (mass timber, LEED Platinum), the Obama Presidential Center, Los Alamos National Laboratory modular office buildings, the Arecibo Observatory forensic investigation, and multiple FIFA World Cup 2026 host stadiums.

The firm's underlying technology platform pairs traditional engineering practice with an internal R&D division, CORE studio, which has produced a suite of proprietary tools including GreenBox (prefabricated mass timber cassette floor systems), Beacon (an embodied-carbon-tracking Revit plug-in), T2D2 (an AI-powered computer vision system for structural damage detection on inspection imagery and video), Skipper (automatic structural-bay design), Konstru (3D interoperability across BIM and analysis tools), Spotlight (material takeoff and visualization), and toolboxes for Grasshopper, Revit, Tekla, and CSI software. A consolidated AI/ML initiative, CORE.AI, leverages the firm's 70 years of structural engineering data for predictive modeling and optioneering. The firm is also pursuing decarbonization, embodied-carbon tracking, and resilience services, supported by 215+ LEED professionals across the staff.

Thornton Tomasetti generates revenue almost entirely through professional services fees on a project-by-project basis, engaging enterprise clients — architects, developers, government and defense agencies, institutional owners, and corporations — through direct senior-level business development, project referrals, and conference presence. Pricing is bespoke and not publicly disclosed. The firm also generates ancillary value from proprietary software IP (e.g., the GreenBox UK commercialization partnership with National Timber Systems) and has historically pursued inorganic growth via acquisitions, including Weidlinger Associates (2015) and Swallow Acoustic Consultants (2016).

Name

Thornton Tomasetti

Legal name

Thornton Tomasetti

Website

https://thorntontomasetti.com

Company type

Private

Founded year

1949

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

Thornton Tomasetti is a 100% employee-held engineering consulting firm with ~1,900 professionals delivering structural design, forensics, sustainability, and decarbonization services across 150+ countries, supported by proprietary tools including T2D2 (AI damage detection) and GreenBox (mass timber).

Ownership category

akta.pro rank

Product category

Structural Engineering Consulting

NAICS

Engineering Services (54133), Architectural, Engineering, and Related Services (5413), Environmental Consulting Services (54162)

SIC

Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Civil & Structural Engineering Consulting (BPAHAIAA)

akta.pro secondary industry

Construction Engineering & Constructability Consulting (BPAHAIAN)

Keywords

• Structural engineering services
• Forensic engineering investigations
• Mass timber design
• Building decarbonization consulting
• Protective design security

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices7 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Others

Revenue model

1. Engineering Consulting Services: Thornton Tomasetti generates revenue by providing engineering design, investigation, analysis, and consulting services on construction and infrastructure projects of every size and complexity. Services span structural design, sustainability, mass timber, façade engineering, acoustics, resilience, forensics, and more across sectors including commercial, government, defense, education, and healthcare.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels7 records

Core offering

Thornton Tomasetti is an engineering consulting firm providing structural design, investigation, forensics, analysis, and advisory services across all building types and infrastructure sectors. The firm also develops and commercializes proprietary technology products including T2D2 AI damage detection, GreenBox mass timber floor cassettes, and Beacon carbon-tracking software through its CORE Studio R&D division, serving architects, developers, government agencies, and institutional owners on a project basis.

Product overview

Thornton Tomasetti is an engineering firm offering integrated professional services across structural design, sustainability, forensics, and technology. The firm operates as a platform-plus-tools architecture: core engineering services (structural design, mass timber construction, decarbonization, resilience planning) are complemented by proprietary technology products including T2D2 (AI-powered damage detection), GreenBox (prefabricated mass timber floor system), Beacon (Revit embodied-carbon plug-in), and multiple internal software tools (Spotlight, Skipper, Konstru, Design Explorer, and various Toolbox plugins for Grasshopper, Revit, Tekla and CSI platforms). The firm conducts R&D through its CORE Studio division, which has developed a suite of computational modeling, visualization and AI tools, including CORE.AI for machine learning applications.

Differentiator

Problem solved

Functional benefit

Brands

• CORE Studio: Thornton Tomasetti's virtual incubator of ideas focusing on computational modeling and R&D, including application development, modeling, AI, and AEC Tech
• GreenBox
• T2D2
• Konstru
• Spotlight
• Skipper
• Beacon

Products and services

• T2D2 AI-powered structural damage detection system that automatically identifies visible damage including cracks, spalls, corrosion, and defects in concrete, steel, masonry, and timber structures by analyzing inspection images and video. Features geolocalization to map detected damage to structural locations and is available as a mobile app for field inspections and a web-based inference service. Used by Thornton Tomasetti engineers and clients on buildings, bridges, tunnels, nuclear reactors, and petrochemical facilities.
• GreenBox Floor System Prefabricated mass timber cassette floor system combining structural capacity, acoustics, vibration control, services integration, fire performance, and moisture management in one assembly. Uses glulam joists and OSB skins to create I-sections allowing long spans with lower timber volumes than solid CLT panels; fire-rated for one hour with two-hour upgrade available; designed for disassembly and reuse in circular construction. Commercialized with National Timber Systems in the UK.
• Beacon Embodied-carbon-tracking Revit plug-in that enables quantity estimates and carbon impact assessments across different structural materials and design schemes, allowing structural engineers and designers to compare material options and make data-driven decisions to reduce embodied carbon during design.
• Skipper Web application providing automatic structural bay design capabilities for Thornton Tomasetti engineers, combining structural engineering expertise with computational modeling to speed up design tasks and reduce time and cost on structural design workflows.
• Konstru Web-based 3D interoperability platform that translates data between building design and analysis software, allowing models to be synchronized without rework. Reduces time spent rebuilding models across software silos for engineering teams.
• Spotlight Material takeoff and data-visualization tool that lets project managers track structural quantities in real time, supporting construction oversight and project delivery for engineering teams.
• Design Explorer Lightweight visualization platform for intuitive interaction with project models and data, offering spatial data representation, mapping techniques, flexible data visualization dashboards, and interactive 3D BIM viewers for project teams.
• TT Toolbox for Grasshopper Custom Grasshopper components tailored for solving structural engineering problems, enabling designers to build parametric models with components purpose-built for structural workflows.
• Revit Toolbox Custom tools for automating repetitive Revit tasks, performing QA/QC and model repair, applying specialized interoperability workflows, and creating custom analyses and visualizations for Autodesk Revit users.
• CSI Toolboxes Toolkits that automate and enhance engineering and design functions for SAP2000 and ETABS CSI applications, boosting the capabilities of CSI applications for structural analysis.
• Tekla Toolbox Custom Tekla tools that automate routine modeling and data-management tasks for Tekla structural software users.
• Structural Engineering Services Comprehensive structural engineering for buildings of all types including commercial, residential, education, healthcare, sports, transportation, defense, and supertall/megatall structures. Services span initial design through construction administration, and include sustainability, kinetics, façade engineering, and protective design capabilities for architects, developers, contractors, and building owners.
• Decarbonization Services Engineering services focused on reducing embodied carbon (carbon footprint of building materials) and operational carbon (energy used during building operations). Includes passive-first architecture, energy-efficient design, electrification, MEP engineering, and carbon capture solutions, and supports compliance with LEED, Passive House, Net-Zero certification, Living Building Challenge, and local regulations including NYC Local Law 97.

Quantifiable outcome

• Mass timber construction can reduce embodied carbon compared to concrete and steel alternatives, validated using Beacon carbon-tracking software
• +4 more outcomes

Named customers11 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability6 records

Feature11 records

Partnerships

Five partnerships are on record, tiered minor and core.

• SOM (Skidmore, Owings & Merrill)minorStrategic or Co-development Partner · 1 January 2026Thornton Tomasetti was selected as one of five architecture and engineering firms to participate in the inaugural Advanced Manufacturing in Architecture and Design (AMAD) workshop, co-hosted by Space/Craft, Cemex, and Thornton Tomasetti. The team developed ORCA, a prototype public furniture piece made from concrete, designed as a self-balancing dynamic form.
• Wilson & CompanyminorImplementation/ SI/ Consulting Partner · 1 December 2025Thornton-Tomasetti Engineering (based in Albuquerque) partnered with Wilson & Company (also based in Albuquerque) to deliver a 26,880-square-foot two-story modular office building at Los Alamos National Laboratory in New Mexico. Wilson & Company handled civil, electrical, and mechanical engineering while Thornton Tomasetti provided structural engineering.
• GraitecminorStrategic or Co-development Partner · 1 December 2025Thornton Tomasetti is a featured keynote speaker and presenter at Graitec's Innovate2BUILD 2026 virtual summit for AECO professionals, sharing insights on digital transformation, AI, and automation in the built environment alongside Turner Construction, Walter P Moore, and Kiewit.
• GenslercoreStrategic or Co-development Partner · 1 January 2024Gensler is the architect of record for the Under Armour Global Headquarters, where Thornton Tomasetti served as structural engineer. The collaboration developed a 280,000-square-foot mass timber office building achieving LEED v4 Platinum and targeting Net Zero Carbon and WELL Building Standard. Thornton Tomasetti collaborated with Gensler during design phases to evaluate mass timber, concrete, and steel schemes.
• National Timber SystemsminorStrategic or Co-development PartnerThornton Tomasetti has partnered with National Timber Systems to produce GreenBox® — an innovative prefabricated mass timber floor cassette system — in the UK market. The partnership enables commercialization of Thornton Tomasetti's proprietary GreenBox technology through National Timber Systems' manufacturing capabilities.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Arup: Global engineering consulting firm with comparable multidisciplinary structural, sustainability, and megaproject capabilities (e.g., Sydney Opera House, Crossrail). Closest peer in scale, ownership structure (employee-owned trust), and signature project portfolio.
• WSP Global: Canadian-based global engineering professional services firm with structural, environmental, and transportation capabilities. Competes directly on large infrastructure and building projects with similar global footprint.
• AECOM: Large publicly traded engineering and infrastructure consulting firm. Competes with TT on building design, transportation, defense, and sustainability mandates, though at significantly larger scale and broader service breadth.
• Jacobs Solutions: Engineering, technical, scientific, and consulting services firm serving infrastructure, water, environmental, and advanced manufacturing markets. Overlaps with TT on critical facilities, government, and resilience work.
• Walter P Moore: Structural engineering and diagnostics firm specializing in buildings, infrastructure, and enclosure engineering. Directly comparable as a structural-specialist peer frequently co-featured alongside TT at industry events (e.g., Graitec Innovate2BUILD 2026).
• Buro Happold: International engineering consultancy with structural, MEP, sustainability, and façade expertise. Competes on signature cultural, sports, and supertall projects (e.g., Louvre Abu Dhabi, Manchester Arena). Closely comparable scale and employee-owned culture.
• Skidmore, Owings & Merrill (SOM): Integrated architecture, engineering, and urban design firm. Collaborates with TT on complex structural projects (e.g., AMAD workshop) and competes for supertall and government work where architectural and structural services are bundled.
• Simpson Gumpertz & Heger (SGH): Engineering firm specializing in structural design, building envelope, and forensic investigation. Closely comparable in forensics/structural specialty work and serves overlapping AEC client base.

Broad incumbents

• Stantec: Global engineering, architecture, and environmental consulting firm. Overlaps on buildings, water, and sustainability work but operates at significantly larger scale with broader multidisciplinary service portfolio.
• Tetra Tech: Engineering and environmental consulting firm with strong sustainability, water, and resilience practices. Competes with TT's decarbonization and resilience service lines but is a broader incumbent with deeper federal water/environmental exposure.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/ttinc
• YouTubeyoutube.com/user/ThorntonTomasetti
• Facebookfacebook.com/thorntontomasetti
• LinkedInlinkedin.com/company/thornton-tomasetti
• Instagraminstagram.com/thorntontomasetti

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles20 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A2 records

Investments7 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Thornton Tomasetti