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
237120 – Oil and Gas Pipeline and Related Structures Construction
236220 – Commercial and Institutional Building Construction
237990 – Other Heavy and Civil Engineering Construction
238290 – Other Building Equipment Contractors
238220 – Plumbing, Heating, and Air-Conditioning Contractors