NAICS Code for Engineering Firm
The NAICS code for an engineering firm is 541330, Engineering Services. Civil, mechanical, electrical, environmental and other engineering design and consulting fall under 541330, Engineering Services. Federal architect-engineer (A-E) work is posted under 541330 and related 5413 codes. SBA applies different size standards to some kinds of 541330 work, so check the size standard on each solicitation.
Related codes to add
Most businesses list several NAICS codes. Use 541330 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 |
|---|---|---|
| 541310 Architectural Services | You design buildings as architects. | $12.5 million or less in receipts |
| 541370 Surveying and Mapping (except Geophysical) Services | You survey land or produce maps. | $19 million or less in receipts |
| 541380 Testing Laboratories and Services | You run a testing laboratory. | $19 million or less in receipts |
| 541340 Drafting Services | You only do drafting. | $9 million or less in receipts |
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 an engineering firm?
The NAICS code for an engineering firm is 541330, Engineering Services. Civil, mechanical, electrical, environmental and other engineering design and consulting fall under 541330, Engineering Services. Federal architect-engineer (A-E) work is posted under 541330 and related 5413 codes. SBA applies different size standards to some kinds of 541330 work, so check the size standard on each solicitation.
What is the SBA size standard for NAICS 541330?
A business counts as small under NAICS 541330 with $25.5 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.