The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy. 

236115 . New Single-Family Housing Construction (except Operative Builders)

236116 . New Multifamily Housing Construction (except Operative Builders) 

236210 . Industrial Building Construction 

236220 . Commercial and Institutional Building Construction 

237110 . Water and Sewer Line and Related Structures Construction 

238120 . Structural Steel and Precast Concrete Contractors 

238130 . Framing Contractors 

238190 . Other Foundation, Structure, and Building Exterior Contractors 

238220 . Plumbing, Heating, and Air-Conditioning Contractors 

238320 . Painting and Wall Covering Contractors 

238990 . All Other Specialty Trade Contractors 

321918 . Other Millwork (including Flooring)

331111 . Iron and Steel Mills 

332311 . Prefabricated Metal Building and Component Manufacturing 

332312 . Fabricated Structural Metal Manufacturing 

332323 . Ornamental and Architectural Metal Work Manufacturing 

332911 . Industrial Valve Manufacturing 

333999 . All Other Miscellaneous General Purpose Machinery Manufacturing 

334290 . Other Communications Equipment Manufacturing 

334519 . Other Measuring and Controlling Device Manufacturing 

339999 . All Other Miscellaneous Manufacturing 

423850 . Service Establishment Equipment and Supplies Merchant Wholesalers 

541330 . Engineering Services 

541350 . Building Inspection Services 

541990 . All Other Professional, Scientific, and Technical Services 

561621 . Security Systems Services (except Locksmiths) 

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