238220 – Plumbing, Heating, & Air-Conditioning Contractors
236220 – Commercial & Institutional Building Construction
237110 – Water And Sewer Line & Related Structures Construction
238130 – Framing Contractors
238140 – Masonry Contractors
238160 – Roofing Contractors
238210 – Electrical Contractors & Other Wiring Installation Contractors
238290 – Other Building Equipment Contractors
238310 – Drywall & Insulation Contractors
238320 – Painting & Wall Covering Contractors
238330 – Flooring Contractors
238350 – Finish Carpentry Contractors
238390 – Other Building Finishing Contractors
238990 – All Other Specialty Trade Contractors
561210 – Facilities Support Services