STO Building Group is a privately owned family of specialized construction companies operating across the United States, Canada, the United Kingdom, Ireland, and the Netherlands. Its member companies - including Structure Tone, LF Driscoll, Layton, and Abbott Construction - retain their individual identities and local expertise while sharing resources, best practices, and capabilities through a unified platform. Across 54 offices, the group employs more than 5,700 people.
The group delivers construction services across a range of demanding sectors, including healthcare, hospitality, technology, and mission-critical facilities. Its structure is designed to combine the scale needed for complex, large projects with the responsiveness typically associated with a local builder. Safety, quality, and sustainability are standing priorities across all member companies.
STO Building Group operates as a collaborative platform rather than a single consolidated firm. Each member company draws on decades of collective expertise while maintaining the distinct strengths and client relationships it has built independently. This model is intended to give clients access to specialized knowledge and broad resources without sacrificing direct, personal engagement.
