Key takeaways
- NAICS 541330 covers applying engineering principles to design, develop and use machines, materials, structures, processes and systems.
- The SBA size standard is $25.5M in average annual receipts. An August 2026 SBA proposal would change it to $252M; that proposal is not in effect.
- Federal agencies awarded $52.27B in this code in FY 2025, and small businesses won $11.54B, or 22.1%.
NAICS 541330 at a glance
| Fact | 541330 |
|---|---|
| NAICS code | 541330 |
| Title | Engineering Services |
| SBA size standard | $25.5M receipts |
| Exception | For military and aerospace, energy policy act and marine engineering work: $47.0M |
| Proposed standard (Aug. 2026) | $252M (not in effect) |
| Federal awards, FY 2025 | $52.27B |
| Small-business awards, FY 2025 | $11.54B (22.1%) |
| Rank by small-business dollars | 3 of the top 15 codes |
Sources: U.S. Census Bureau NAICS manual; SBA Table of Small Business Size Standards, 13 CFR 121.201; GovSpend analysis of FPDS data, May 27, 2026. Confirm any size determination with the SBA size tool.
What NAICS 541330 covers
This industry comprises businesses primarily engaged in applying engineering principles to design, develop and use machines, materials, structures, processes and systems.
Related codes: 541380 Testing Laboratories and Services.
Size standard for 541330
A company qualifies as small under NAICS 541330 if its average annual receipts are $25.5M or less, counting affiliates. Exceptions for military and aerospace, energy policy act and marine engineering work: $47.0M.
In August 2026, the SBA proposed new size standards that would set this code at $252M. The proposal is not in effect. See our SBA size standards guide.
Federal spending in 541330
Federal agencies awarded $52.27B in contracts under NAICS 541330 in fiscal 2025, and $11.54B, or 22.1%, went to small businesses. That ranks 541330 No. 3 among NAICS codes by small-business dollars, according to GovSpend's analysis of FPDS data. See the full ranking of top NAICS codes for government contracts.
How to win contracts in 541330
- List the code in SAM.gov. Add 541330 to your registration if it describes work you do, and choose a primary code for your main business; see our SAM registration guide.
- Search by code. Filter SAM.gov contract opportunities and agency procurement forecasts by 541330 to find recurring buyers.
- Study past awards. Look at which agencies, contract vehicles and incumbents dominate the code before you pursue it.
- Target the right agencies. Our federal agency guides cover budgets, buying components and forecasts for 23 agencies.
- Look beyond federal. States, cities, counties and school districts buy the same services; see our state government guides.
How KSG helps
Kensington Sales Group's SDRs book meetings with public agencies across Federal, SLED, K-12 & Higher Ed, Healthcare, Tribal, Special Districts and Utilities. We find the program offices and buyers that spend in NAICS 541330 and get you in front of them before solicitations drop. See how our federal sales development works.