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
561210 – Facilities Support Services
236220 – Commercial and Institutional Building Construction
238160 – Roofing Contractors
238330 – Flooring Contractors
238290 – Other Building Equipment Contractors
238210 – Electrical Contractors and Other Wiring Installation Contractors