Top 130 Office Building Construction Firms for 2025

STO Building Group, Turner Construction, AECOM, PCL Construction Enterprises, Gilbane Building Company, J.T. Magen & Company, Balfour Beatty US, and Clark Group top Building Design+Construction's ranking of the nation's largest office building sector general contractors and construction management (CM) firms for 2025, as reported in Building Design+Construction's 2025 Giants 400 Report. Note: This ranking includes revenue for all office building work, including core and shell projects and workplace/interior fitouts. 

Source: Building Design+Construction's 2025 Giants 400 Report