NAICS 3 Digit Subsector Code 237

Subsector 237

NAICS Subsector Code 237 – Heavy and Civil Engineering Construction

Definition of NAICS 3 Digit Subsector Code 237: The Heavy and Civil Engineering Construction subsector comprises establishments whose primary activity is the construction of entire engineering projects (e.g., highways and dams), and specialty trade contractors, whose primary activity is the production of a specific component for such projects. Specialty trade contractors in Heavy and Civil Engineering Construction generally are performing activities that are specific to heavy and civil engineering construction projects and are not normally performed on buildings. The work performed may include new work, additions, alterations, or maintenance and repairs.

Specialty trade activities are classified in this subsector if the skills and equipment present are specific to heavy or civil engineering construction projects. For example, specialized equipment is needed to paint lines on highways. This equipment is not normally used in building applications so the activity is classified in this subsector. Traffic signal installation, while specific to highways, uses much of the same skills and equipment that are needed for electrical work in building projects and is therefore classified in Subsector 238, Specialty Trade Contractors.

Construction projects involving water resources (e.g., dredging and land drainage) and projects involving open space improvement (e.g., parks and trails) are included in this subsector. Establishments whose primary activity is the subdivision of land into individual building lots usually perform various additional site-improvement activities (e.g., road building and utility line installation) and are included in this subsector.

Establishments in this subsector are classified based on the types of structures that they construct. This classification reflects variations in the requirements of the underlying production processes.

Three Digit Subsector Breakdown for the North American Industry Classification System

NAICS codes are broken down by digit. The broadest description starts with the 2 digit sector codes. The 3 digit subsector codes are more specific, then the 4 digit industry group, 5 digit industry, and the most specific is the 6 digit NAICS code. If NAICS Subsector 237 does not describe the industry of the business in question, then select the largest applicable code below. From there, follow the progression of smaller digits to the larger digits in order to obtain the most specific 6 digit classification.

  • Sector 23: Construction
    • Subsector 237: Heavy and Civil Engineering Construction
      • Industry Group 2371: Utility System Construction
        • Industry 23711: Water and Sewer Line and Related Structures Construction
          • 6 Digit Code(s) NAICS 237110: Water and Sewer Line and Related Structures Construction
        • Industry 23712: Oil and Gas Pipeline and Related Structures Construction
          • 6 Digit Code(s) NAICS 237120: Oil and Gas Pipeline and Related Structures Construction
        • Industry 23713: Power and Communication Line and Related Structures Construction
          • 6 Digit Code(s) NAICS 237130: Power and Communication Line and Related Structures Construction
      • Industry Group 2372: Land Subdivision
        • Industry 23721: Land Subdivision
          • 6 Digit Code(s) NAICS 237210: Land Subdivision
      • Industry Group 2373: Highway, Street, and Bridge Construction
        • Industry 23731: Highway, Street, and Bridge Construction
          • 6 Digit Code(s) NAICS 237310: Highway, Street, and Bridge Construction
      • Industry Group 2379: Other Heavy and Civil Engineering Construction
        • Industry 23799: Other Heavy and Civil Engineering Construction
          • 6 Digit Code(s) NAICS 237990: Other Heavy and Civil Engineering Construction

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NAICS 3 Digit Subsector Code 237