This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Possible NAICS Codes
238220 – Plumbing, Heating, and Air-Conditioning Contractors
236220 – Commercial and Institutional Building Construction
236210 – Industrial Building Construction
237130 – Power and Communication Line and Related Structures Construction
238990 – All Other Specialty Trade Contractors