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    238220 - Plumbing, Heating, and Air-Conditioning Contractors

    When it comes to keeping buildings comfortable and functional, few industries are as essential as those involved in plumbing, heating, and air-conditioning. NAICS code 238220 specifically covers this crucial sector. Whether you’re a contractor, a business owner, or just curious about the industry, understanding this NAICS classification can help you navigate government contracting, market analysis, and business development opportunities in the construction sector.

    What is NAICS Code 238220?

    NAICS code 238220 represents the industry group known as Plumbing, Heating, and Air-Conditioning Contractors. This classification includes establishments primarily engaged in:

    • Installing plumbing systems
    • Installing and maintaining heating equipment
    • Installing and servicing air-conditioning systems

    These services are provided across all types of buildings—residential, commercial, and industrial—making this a diverse and vital industry.

    Sector and Typical Business Activities

    NAICS 238220 falls within the broader Construction sector, highlighting its role in building infrastructure and maintaining essential services within structures.

    Typical Business Activities Under NAICS 238220

    Businesses classified under this code often specialize in:

    • Residential plumbing services: Installation and repairs of water supply and drainage systems in homes.
    • Commercial HVAC installation and maintenance: Designing, installing, and servicing heating, ventilation, and air conditioning systems for office buildings, shopping centers, and other commercial properties.
    • Heating system repair and installation: Servicing furnaces, boilers, and other heating equipment in all types of buildings.

    Many companies offer a combination of these services, ensuring indoor comfort, safety, and compliance with building regulations.

    Size Standard for NAICS 238220

    Understanding the size standard is key for businesses seeking government contracts or small business certifications. The Small Business Administration (SBA) defines the size standard for NAICS 238220 as:

    • $19 million dollars in average annual receipts.

    This means that businesses with average annual revenues of $19 million or less qualify as small businesses under this classification, opening doors for federal assistance, bidding preferences, and other benefits.

    Examples of Businesses Under NAICS 238220

    • Local plumbing service companies that install or repair residential water heaters and pipes.
    • Commercial HVAC firms specializing in large-scale climate control systems for office complexes.
    • Heating contractors supplying and maintaining boilers for industrial plants.
    • Companies offering comprehensive mechanical systems services combining plumbing, heating, and air conditioning installations.

    These businesses play pivotal roles in construction projects and ongoing maintenance, ensuring that buildings remain operational and up to code.


    Frequently Asked Questions (FAQs)

    What does NAICS code 238220 cover?

    NAICS 238220 covers businesses primarily engaged in plumbing, heating, and air-conditioning contracting across residential, commercial, and industrial sectors.

    Which sector does this NAICS code belong to?

    This NAICS code falls under the Construction sector.

    What is the SBA size standard for NAICS code 238220?

    The SBA size standard for this code is $19 million in average annual receipts.

    Can businesses in this NAICS code work on both new construction and repair projects?

    Yes, firms classified under 238220 typically engage in both new installations and repair/maintenance services.

    Why is the NAICS code important for contractors?

    Knowing the NAICS code helps contractors identify relevant business opportunities, access government contracts, and qualify for small business programs.


    By understanding NAICS code 238220 and what it entails, plumbing, heating, and air-conditioning contractors can better position themselves for business growth, government contracting, and industry recognition. Whether you’re offering residential plumbing or commercial HVAC solutions, this classification provides a framework to navigate the construction industry effectively.

    Stay informed and leverage your NAICS classification to maximize your business potential in the plumbing, heating, and air-conditioning sector.