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    2379 - Other Heavy and Civil Engineering Construction

    When it comes to America’s critical infrastructure projects, NAICS code 2379 stands at the forefront. Known as Other Heavy and Civil Engineering Construction, this industry classification encompasses a wide range of large-scale construction projects vital to maintaining and improving transportation and public works systems. Whether it's building bridges, developing tunnels, or constructing highways, businesses under this NAICS code play a crucial role in supporting the nation's infrastructure.


    What is NAICS Code 2379?

    NAICS Code 2379 covers establishments primarily engaged in heavy and civil engineering construction projects that aren’t categorized elsewhere in the Construction sector. Unlike general building construction, the projects under this code focus on specialized infrastructure work, often involving substantial engineering effort and heavy equipment.

    Description and Scope

    • Industry title: Other Heavy and Civil Engineering Construction
    • Primary activities:
      • Bridge construction
      • Tunnel construction
      • Highway and street construction
      • Other large-scale civil engineering projects not covered in other NAICS codes

    These projects are foundational for transportation networks, public amenities, and urban development, requiring expertise in heavy construction techniques and civil engineering principles.


    Sector Overview: Construction

    NAICS code 2379 falls under the Construction sector (Sector 23). This sector broadly involves the construction of buildings, infrastructure, and specialty trades. NAICS 2379 zeroes in on heavy civil and infrastructure projects that demand specialized skills, machinery, and resources beyond typical commercial or residential construction.

    Typical Business Activities Include:

    • Building highways, streets, and roads
    • Erecting bridges and related structures
    • Constructing tunnels for transportation or utilities
    • Other heavy engineering projects like flood control or dam-related infrastructure (if not classified elsewhere)

    Size Standards for NAICS 2379

    To determine small business eligibility for government contracting and other programs, size standards are established by the Small Business Administration (SBA). For NAICS 2379, the size standard is:

    Size Standard Category Employee Count or Revenue
    Small Business Size Standard Maximum 1,500 employees

    Businesses with 1,500 or fewer employees generally qualify as small under this NAICS code, making them eligible for certain small business set-aside contracts in federal procurement.


    Examples of Businesses Under NAICS 2379

    • Heavy Civil Construction Firms: Companies specializing solely in large-scale infrastructure, like highway interchanges and overpasses.
    • Bridge Contractors: Firms focused on building and rehabilitating bridges for municipal, state, or federal clients.
    • Tunnel Construction Companies: Businesses engaged in excavation and engineering of tunnels for subways, highways, or utilities.

    NAICS Code 2379 Details Table

    NAICS Code Title Sector Description Size Standard
    2379 Other Heavy and Civil Engineering Construction Construction Establishments engaged in heavy and civil engineering projects not classified elsewhere. Includes construction of highways, bridges, tunnels, and other large civil works. 1,500 employees (max size for small business)

    Frequently Asked Questions (FAQs)

    What types of projects fall under NAICS 2379?

    Projects typically include the construction of highways, bridges, tunnels, streets, and other heavy civil infrastructure not specifically classified under other NAICS codes.

    How does NAICS 2379 differ from other heavy construction codes?

    NAICS 2379 covers specialized heavy and civil engineering projects not covered by more specific codes such as highway, street, bridge, or utility system construction, filling the gap for other types of large-scale infrastructure work.

    What is the SBA size standard for small businesses in NAICS 2379?

    The SBA’s size standard for NAICS 2379 is a maximum of 1,500 employees to qualify as a small business for federal contracting purposes.

    Can construction companies involved in tunnel projects fall under this code?

    Yes, tunnel construction companies are a prime example of businesses classified under NAICS 2379.

    Is NAICS 2379 used for government contracting?

    Absolutely. Many federal and state infrastructure projects list NAICS 2379 as the relevant industry code for procurement and contracting opportunities.


    Final Thoughts

    Understanding NAICS code 2379 is essential for contractors, engineers, and businesses specializing in heavy civil infrastructure projects. From bridges to tunnels and highways, these construction efforts are foundational to America’s transportation and public works systems. By recognizing the scope, sector, and size standards of NAICS 2379, businesses can better position themselves for government projects and industry growth.


    If you’re involved in heavy and civil engineering construction, ensure your NAICS classification is accurate to tap into the right opportunities and compliance requirements.