Possible NAICS Codes
561210 – Facilities Support Services
236220 – Commercial and Institutional Building Construction
238220 – Plumbing, Heating, and Air-Conditioning Contractors
238290 – Other Building Equipment Contractors
238320 – Painting and Wall Covering Contractors
238990 – All Other Specialty Trade Contractors
561621 – Security Systems Services (except Locksmiths)
811310 – Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance