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Founded in 1904 as a builder of stone and masonry buildings, the O'Connor Companies have expanded to include interior and ground up construction for the academic and institutional markets, long term mechanical maintenance contracts for the power industry and complex installations of pollution control upgrades with a focus on safety.

O'Connor Constructors offers a full staff of Pre-Construction specialists, Project Managers and Site Superintendents for General Contracting and Construction Management Services for corporate, institutional and industrial clients in both the public and private sectors.

O'Connor Corporation is a major provider of boiler, turbine, pollution control, and piping services for power generation and industrial facilities throughout the Northeast. O'Connor offers unparalleled expertise in utility installation, upgrade and maintenance services.

O'Connor Safety Corporation provides rescues services, monitors worksite safety, evaluates and corrects workplace hazards. O'Connor Safety Corporation will provide Health and Safety representation in accordance with a facility's or O'Connor's safety protocols.

Consistently ranked as one of Boston's Top 10 Mechanical Firms, Beacon Piping Company specializes in power and process piping, heating and cooling system installations, and plant maintenance to a variety of clients.