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
561621 – Security Systems Services (except Locksmiths)
238210 – Electrical Contractors and Other Wiring Installation Contractors
561210 – Facilities Support Services
238330 – Flooring Contractors