STO Building Group
STO Building Group is a privately held construction management and general contracting firm operating 14 companies across 54 offices in five countries, delivering 2,000+ projects annually for enterprise clients in healthcare, mission-critical data centers, commercial, life sciences, and education.
- Company typePrivate
- Founded1971
- HeadquartersNew York, United States
- Headcount5,001–10,000
- GTM typeB2B
- OfferingServices
What STO Building Group does
STO Building Group is a privately held construction management and general contracting firm headquartered in the United States. Founded in 1971 as Structure Tone and rebranded to STO Building Group in 2017, the company operates through 14 operating companies across 54 offices in the US, Canada, UK, Ireland, and the Netherlands, employing more than 5,700 people and delivering over 2,000 projects annually. It is ranked #3 on the ENR Top 400 Contractors list and #50 on Forbes America's Largest Private Companies.
The company serves institutional and enterprise clients across commercial/corporate, healthcare, mission-critical (data centers), education, life sciences, hospitality, and cultural/religious segments. Named clients include Google, Microsoft, Amazon, Meta, LinkedIn, Workday, KPMG, Prudential, Novartis, Hackensack Meridian Health, Children's Hospital of Philadelphia, Penn Medicine, FanDuel, Edelman, Southwest Airlines, Northeastern University, CyrusOne, and Riot Games. More than 80% of clients are repeat customers, reflecting long-tenured program relationships.
STOBG generates revenue primarily through construction management and general contracting services on commercial building projects, supported by a $5B bonding capacity that enables large-scale work. It uses VDC/BIM workflows, proprietary programs such as Safety 360 and Quality 360, and — as of 2026 — partnerships with Buildots, Bespoke Metrics, and Skema.ai to advance AI-driven analytics and progress tracking. The business model is anchored by multi-year enterprise programs in healthcare, life sciences, and hyperscale data centers, with the Mission Critical division launched in 2021 as a focused growth platform.
STO Building Group firmographics
Firmographics- Name
- STO Building Group
- Legal name
- STO Building Group
- Website
- https://stobuildinggroup.com
- Company type
- Private
- Founded year
- 1971
- Operating status
- Operating
- Headcount range
- 5,001–10,000 employees
- Short description
- STO Building Group is a privately held construction management and general contracting firm operating 14 companies across 54 offices in five countries, delivering 2,000+ projects annually for enterprise clients in healthcare, mission-critical data centers, commercial, life sciences, and education.
- Ownership category
- akta.pro rank
STO Building Group industry classification
Industry- Product category
- Construction Management & General Contracting
- NAICS
- Commercial and Institutional Building Construction (236220), Commercial and Institutional Building Construction (23622), Nonresidential Building Construction (2362), Building Finishing Contractors (2383)
- SIC
- General Bldg Contractors - Nonresidential Bldgs (1540), Operative Builders (1531)
- akta.pro primary industry
- Commercial General Contracting (New Build) (IMAFAAAA)
- akta.pro secondary industries
- Office & Corporate Building Construction (IMAFACAA), Residential General Contracting (New Build) (IMAFAAAB)
Keywords
Where STO Building Group is headquartered
LocationHeadquarters
- HQ city
- New York
- HQ country
- United States
- HQ region
- North America
Offices12 records
Markets served
STO Building Group business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Others
Revenue model
- Construction Management Services: Full-service construction management for commercial, healthcare, educational, and institutional projects including preconstruction, design-build, and project delivery
- General Contracting: General contracting services including interior fit-outs, core and shell construction, renovations, and new building construction
- Mission Critical Construction: Specialized construction services for data centers and mission critical facilities
Go-to-market motion1 record
Distribution channels1 record
Marketing channels6 records
STO Building Group product offering
Product offeringCore offering
STO Building Group (STOBG) is a privately owned construction management and general contracting firm that operates as a family of 14 independent construction brands delivering preconstruction, construction management, design-build, general contracting, interior fit-out, and specialized construction services. The company serves enterprise clients across commercial, healthcare, mission critical/data center, life sciences, education, and corporate interior sectors in the US, Canada, UK, Ireland, and the Netherlands, with combined construction revenue of $20 billion in 2026.
Product overview
STO Building Group (STOBG) is a privately owned holding company and family of 14 operating construction companies — including Structure Tone, Structure Tone Southwest, LF Driscoll, Structure Tone International, Pavarini McGovern, Pavarini Northeast, Layton Construction, BCCI Construction, Abbott Construction, Ajax Building Company, Govan Brown, RC Andersen, and STO Mission Critical — providing construction management, general contracting, interior fit-out, and specialized services across the US, Canada, UK, Ireland, and the Netherlands. The portfolio spans diverse sectors including healthcare, life sciences, mission critical/data centers, corporate interiors, education, and hospitality. STOBG's parent platform enables its subsidiaries to share resources, real-time data, trade relationships, bonding capacity, and purchasing power while maintaining their distinct business models. Supporting proprietary programs include Safety 360° (behavior-based safety methodology) and Quality 360° (quality management program), alongside Virtual Design & Construction (VDC) services and the internal STOBG Innovation engine for evaluating emerging technologies. The company generated $20B in construction revenue in 2026, ranked #3 on ENR's Top 400 Contractors list.
Differentiator
Problem solved
Functional benefit
Products and services
- Construction Management
Quantifiable outcome
- 80%+ of projects from repeat clients
- +2 more outcomes
Companies that use STO Building Group
Customer profileNamed customers18 records
Segments7 records
Ideal customer profiles5 records
STO Building Group technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
STO Building Group partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- BuildotscoreGreg Dunkle (COO of STO Building Group) appointed to Buildots advisory board, bringing decades of frontline construction experience to help scale AI-driven construction management. The move aims to establish construction intelligence as an operational standard across the industry.
- Bespoke MetricscoreSTO Building Group selected COMPASS platform as its exclusive subcontractor prequalification tool, with rollout beginning May 11, 2026. The partnership brings more than 10,000 subcontractors onto COMPASS, expanding the platform's network to over 300 general contractors across North America.
- ClarkDietrichminorPartnership to debur studs and reduce lacerations as part of STOBG's Safety 360° program innovation initiatives.
- Otto Tech SystemsminorPartnership to pilot SmartLadder technology as part of STOBG's safety innovation program.
Scale indicators12 records
Recent moves7 records
Expansion highlights5 records
STO Building Group competitors and assessment
Company assessmentDirect peers
- Hensel Phelps: Hensel Phelps is a top employee-owned GC directly competing with STO in aviation, healthcare, higher education, and government. Both firms emphasize long-tenured client relationships and large, complex program deliveries.
- Mortenson Construction: Mortenson is a top US GC with deep overlap in mission critical/data centers, healthcare, and corporate — making it a direct competitor to STO Mission Critical and Structure Tone's healthcare practice. Both firms serve hyperscaler and large institutional clients.
- Gilbane Building Company: Gilbane is a top-10 privately held US general contractor competing head-to-head with STO in healthcare, education, and corporate interiors. Both firms have strong repeat-client business models and family/employee-ownership cultures with similar geographic footprints.
- Holder Construction: Holder is a top privately held GC specializing in mission critical/data centers and corporate — directly overlapping STO Mission Critical's hyperscaler work. Both firms compete for large enterprise data center and tenant improvement projects.
- DPR Construction: DPR is a privately held national GC specializing in healthcare, life sciences, mission critical, and advanced technology/corporate interiors — directly overlapping STO's core verticals. Both firms emphasize technical building expertise and tech-enabled project delivery.
- Clark Construction Group: Clark is a top US general contractor competing with STO on large commercial, healthcare, education, and mission critical projects in the Northeast, Mid-Atlantic, and beyond. Both firms deliver design-build, CM-at-risk, and GC services to enterprise clients.
- Turner Construction Company: Turner is the #1 ENR-ranked commercial general contractor in the US, directly competing with STO across corporate interiors, healthcare, mission critical, and higher education. Both firms deliver large-scale construction management and GC services to enterprise clients nationwide.
- Balfour Beatty US: Balfour Beatty is a major international contractor with US commercial building operations overlapping STO's corporate interiors and healthcare work. Both firms operate with multi-state footprints and similar CM/general contracting service offerings.
- Skanska USA: Skanska's US commercial building operations compete directly with STO in office, healthcare, and education construction. Both firms operate major East Coast and Texas presences and pursue large-scale commercial GC and construction management engagements.
Broad incumbents
- AECOM: AECOM's Construction Services business (including legacy Tishman) competes with STO in large-scale commercial and institutional construction as part of a much broader design, engineering, and program management portfolio. As a public incumbent, AECOM offers a wider service mix than STO's specialized GC focus.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights6 records
Customer concentration
STO Building Group social profiles
Digital presenceSTO Building Group financial estimates
Financial estimateRevenue estimate
Valuation estimate
STO Building Group leadership team
Management profileNumber of profiles
Profiles4 records
STO Building Group subsidiaries and ownership
Company hierarchySubsidiaries13 records
STO Building Group funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
STO Building Group M&A and investment
M&A and investmentM&A
Investments5 records
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about STO Building Group
What does STO Building Group do?
STO Building Group (STOBG) is a privately owned construction management and general contracting firm that operates as a family of 14 independent construction brands delivering preconstruction, construction management, design-build, general contracting, interior fit-out, and specialized construction services. The company serves enterprise clients across commercial, healthcare, mission critical/data center, life sciences, education, and corporate interior sectors in the US, Canada, UK, Ireland, and the Netherlands, with combined construction revenue of $20 billion in 2026.
Is STO Building Group a public or private company?
STO Building Group is a private company. It is classified as management employee owned and is currently operating.
When was STO Building Group founded?
STO Building Group was founded in 1971. It employs 5,001 to 10,000 people.
Where is STO Building Group based?
STO Building Group is headquartered in New York, United States, in the North America region.
How does STO Building Group make money?
Three revenue lines are on record. Construction Management Services are the primary driver. The others are general Contracting and mission Critical Construction.
Who are STO Building Group's main competitors?
Direct peers on record are Hensel Phelps, Mortenson Construction, Gilbane Building Company, Holder Construction, DPR Construction, Clark Construction Group, Turner Construction Company, Balfour Beatty US and Skanska USA. AECOM is listed as a broad incumbent.
Does STO Building Group have an API?
No public API is recorded for STO Building Group.
What industry is STO Building Group in?
STO Building Group's product category is Construction Management & General Contracting. Its primary akta.pro industry code is IMAFAAAA, Commercial General Contracting (New Build), with a secondary code of IMAFACAA, Office & Corporate Building Construction. Its NAICS code is 236220 and its SIC code is 1540.