Exclusion(s): Establishments primarily engaged in:

*constructing warehouses (23622, Commercial and Institutional Building Construction); *constructing water treatment plants, sewage treatment plants, and pumping stations for water and sewer systems (23711, Water and Sewer Line and Related Structures Construction); *constructing oil refineries and petrochemical plants (23712, Oil and Gas Pipeline and Related Structures Construction); *constructing power generation plants (except hydroelectric) (23713, Power and Communication Line and Related Structures Construction); and *performing specialized construction work on industrial buildings, generally on a subcontract basis (238, Specialty Trade Contractors).

Exclusion(s): Establishments primarily engaged in:

*constructing structures that are integral parts of utility systems (e.g., storage tanks, pumping stations) or are used to produce products for these systems (e.g., power plants, refineries) (2371, Utility System Construction); *performing specialized construction work on commercial and institutional buildings generally on a subcontract basis (238, Specialty Trade Contractors); and *constructing buildings on their own account for rent or lease (5311, Lessors of Real Estate).