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Here's a breakdown of some of the more specific categories within this sector: 236 - Construction of Buildings This sector is divided into: 2361 Residential Building Construction 236115 New Single-Family Housing Construction (except For-Sale Builders) 236116 New Multifamily Housing Construction (except For-Sale Builders) 236117 New Housing For-Sale Builders 236118 Residential Remodelers 2362 Nonresidential Building Construction 236210 Industrial Building Construction 236220 Commercial and Institutional Building Construction 237 - Heavy and Civil Engineering Construction This includes projects such as highways, utility systems, and land subdivisions: 2371 Utility System Construction 237110 Water and Sewer Line and Related Structures Construction 237120 Oil and Gas Pipeline and Related Structures Construction 237130 Power and Communication Line and Related Structures Construction 2372 Land Subdivision 237210 Land Subdivision 2373 Highway, Street, and Bridge Construction 237310 Highway, Street, and Bridge Construction 2379 Other Heavy and Civil Engineering Construction 237990 Other Heavy and Civil Engineering Construction (includes Marine construction and Outdoor Recreation Facility construction) 238 - Specialty Trade Contractors This category encompasses contractors who specialize in certain trades necessary to the building process: 2381 Foundation, Structure, and Building Exterior Contractors 238110 Poured Concrete Foundation and Structure Contractors 238120 Structural Steel and Precast Concrete Contractors 238130 Framing Contractors 238140 Masonry Contractors 238150 Glass and Glazing Contractors 238160 Roofing Contractors 238170 Siding Contractors 238190 Other Foundation, Structure, and Building Exterior Contractors 2382 Building Equipment Contractors 238210 Electrical Contractors 238220 Plumbing, Heating, and Air-Conditioning Contractors 238290 Other Building Equipment Contractors 2383 Building Finishing Contractors 238310 Drywall and Insulation Contractors 238320 Painting and Wall Covering Contractors 238330 Flooring Contractors 238340 Tile and Terrazzo Contractors 238350 Finish Carpentry Contractors 238390 Other Building Finishing Contractors 2389 Other Specialty Trade Contractors 238910 Site Preparation Contractors 238990 All Other Specialty Trade Contractors (including outdoor swimming pool construction, and sandblasting building exteriors) 2