STO Building Group

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.

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

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

• Construction management services
• General contracting services
• Commercial interior construction
• Mission critical construction
• Healthcare facility construction

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices12 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Construction Management Services: Full-service construction management for commercial, healthcare, educational, and institutional projects including preconstruction, design-build, and project delivery
2. General Contracting: General contracting services including interior fit-outs, core and shell construction, renovations, and new building construction
3. Mission Critical Construction: Specialized construction services for data centers and mission critical facilities

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core 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

Named customers18 records

Segments7 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• BuildotscoreStrategic or Co-development Partner · 21 May 2026Greg 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 MetricscoreTechnology or Integration · 6 May 2026STO 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.
• ClarkDietrichminorStrategic or Co-development PartnerPartnership to debur studs and reduce lacerations as part of STOBG's Safety 360° program innovation initiatives.
• Otto Tech SystemsminorStrategic or Co-development PartnerPartnership to pilot SmartLadder technology as part of STOBG's safety innovation program.

Scale indicators12 records

Recent moves7 records

Expansion highlights5 records

Direct 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

• Xx.com/structuretone
• YouTubeyoutube.com/@STOBuildingGroup
• Facebookfacebook.com/StructureTone
• LinkedInlinkedin.com/company/structure-tone
• Instagraminstagram.com/stobuildinggroup

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries13 records

Funding overview

Funding rounds

Investors

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

M&A

Investments5 records

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

Frequently asked questions about STO Building Group