NAICS Code for Plumbing Business
The NAICS code for a plumbing business is 238220, Plumbing, Heating, and Air-Conditioning Contractors. Plumbing contractors use 238220, the same code as HVAC contractors, and it also covers fire sprinkler and lawn sprinkler installation. Underground water and sewer line construction is heavy construction under 237110, not plumbing. Drain cleaning on its own is listed under 561790.
Related codes to add
Most businesses list several NAICS codes. Use 238220 as your primary if it covers most of your revenue, and add these when they describe work you also do:
| Code | Use it when | Size standard |
|---|---|---|
| 237110 Water and Sewer Line and Related Structures Construction | You build water mains and sewer lines outside buildings. | $45 million or less in receipts |
| 562991 Septic Tank and Related Services | You pump septic tanks. | $9 million or less in receipts |
| 561790 Other Services to Buildings and Dwellings | You only clean drains. | $9 million or less in receipts |
Government contracts for this work
- Open federal contracts, top buyers and winners for this kind of work
- NAICS code for an HVAC company (also 238220)
- NAICS code for a fire protection company (also 238220)
How to choose
Your primary NAICS code should match the work that brings in most of your revenue, and it sets which size standard applies to you for most set-aside contracts. Read each code's Census definition before you register. Our guide on how to choose NAICS codes covers the trade-offs. To see whether you count as small under these codes, try the size standard checker.
Frequently asked questions
What is the NAICS code for a plumbing business?
The NAICS code for a plumbing business is 238220, Plumbing, Heating, and Air-Conditioning Contractors. Plumbing contractors use 238220, the same code as HVAC contractors, and it also covers fire sprinkler and lawn sprinkler installation. Underground water and sewer line construction is heavy construction under 237110, not plumbing. Drain cleaning on its own is listed under 561790.
What is the SBA size standard for NAICS 238220?
A business counts as small under NAICS 238220 with $19 million or less in average annual receipts, under the SBA's table of size standards. Federal contracts set aside for small businesses under this code are limited to firms that meet it.
Can I list more than one NAICS code?
Yes. In your SAM.gov registration you pick one primary NAICS code and can add as many others as describe work you can actually do. Add every code below that fits, because agencies search and set aside contracts by code.