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236115: New Single-Family Housing Construction 

236116: New Multifamily Housing Construction 

236117: New Housing Operative Builders 

236118: Residential Remodelers 

236210: Industrial Building Construction 

236220: Commercial and Institutional Building Construction 

237110: Water and Sewer Line and Related Structures 


237130: Power and Communication Line and Related Structures 


237310: Highway, Street, and Bridge Construction 

238110: Poured Concrete Foundation and Structure Contractors 

238150: Glass and Glazing Contractor 

238160: Roofing Contractors 

238210: Electrical Contractors 

238220: Plumbing, Heating, and Air-Conditioning Contractors 

238320: Painting and Wall Covering Contractors 

238330: Flooring Contractor 

238910: Site Preparation Contractors 

238990: All Other Specialty Trade Contractors 

541330: Engineering Services 

561210: Facilities Support Services 

811310: Commercial/Industrial Machinery Equipment 

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