What's the NAICS and SIC code for a plumbing or hvac contractor?
For a plumbing or hvac contractor, use NAICS 238220 (Plumbing, Heating, and Air-Conditioning Contractors) in the US and SIC 43220 (Plumbing, heat and air-conditioning installation) in the UK.
United States, NAICS 2022
238220 Plumbing, Heating, and Air-Conditioning Contractors
Plumbing, Heating, and Air-Conditioning Contractors covers both trades.
SBA small business limit: $19 million average annual receipts.
United Kingdom, SIC 2007
43220 Plumbing, heat and air-conditioning installation
Plumbing, heat and air-conditioning installation.
Use this code when you register with Companies House or file your confirmation statement.
When a different code fits better
These are the codes most often confused with the main answer. Pick by the activity that earns most of your revenue.
| Code | Title | Use it if |
|---|---|---|
| NAICS 238210 | Electrical Contractors and Other Wiring Installation Contractors | you mainly do electrical work |
| SIC 43290 | Other construction installation | you mainly install insulation or other building systems |
Good to know
Plumbers and HVAC installers share one code in both countries.
You can list more than one code. Companies House accepts up to four SIC codes, and SAM.gov lets you add several NAICS codes, with one marked as primary.
What the code affects
- SBA programs and federal contracts: your NAICS code sets the size limit you must stay under to count as small. Check your size.
- SAM.gov registration: contracting officers search by NAICS, so list every code you can deliver work under.
- Companies House: your SIC code appears on the public register and in your confirmation statement.
Related business types
Codes checked against the US Census 2022 NAICS index and the ONS UK SIC 2007 index. Information only; confirm with the agency you file with.