2022 NAICS national industry in sector 54 Professional, Scientific, and Technical Services
541330 Engineering Services
NAICS 541330 is the US industry code for engineering services. It covers establishments primarily engaged in applying physical laws and principles of engineering in the design, development, and utilization of machines, materials, instruments, structures, processes, and systems.
- Code
- 541330 (2022 NAICS)
- Title
- Engineering Services
- Part of
- Architectural, Engineering, and Related Services
- SBA small business limit
- Average annual receipts up to $25.5 million (plus 3 exceptions, below)
- Closest UK SIC
- 71111, 71112, 71121, 71122 and 1 more (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This industry comprises establishments primarily engaged in applying physical laws and principles of engineering in the design, development, and utilization of machines, materials, instruments, structures, processes, and systems. The assignments undertaken by these establishments may involve any of the following activities: provision of advice, preparation of feasibility studies, preparation of preliminary and final plans and designs, provision of technical services during the construction or installation phase, inspection and evaluation of engineering projects, and related services.
Examples Census gives
- Civil engineering services
- Environmental engineering services
- Construction engineering services
- Mechanical engineering services
- Engineers' offices
- Robotics automation engineering services
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Planning and designing computer systems that integrate computer hardware, software, and communication technologies are classified in U.S. Industry 541512, Computer Systems Design Services.
- Designing and writing custom software to meet the needs of a particular customer are classified in U.S. Industry 541511, Custom Computer Programming Services.
- Software design, development, and publishing, or software publishing only are classified in Industry 513210, Software Publishers.
- Performing surveying and mapping services of the surface of the earth, including the sea floor are classified in Industry 541370, Surveying and Mapping (except Geophysical) Services.
- Gathering, interpreting, and mapping geophysical data are classified in Industry 541360, Geophysical Surveying and Mapping Services.
- Creating and developing designs and specifications that optimize the use, value, and appearance of products are classified in Industry 541420, Industrial Design Services.
- Providing advice and assistance to others on environmental issues, such as the control of environmental contamination from pollutants, toxic substances, and hazardous materials are classified in Industry 541620, Environmental Consulting Services.
- Engineering research and development are classified in U.S. Industry 541715, Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology).
- Both the design and construction of buildings, highways, and other structures or in managing construction projects are classified in Sector 23, Construction, according to the type of project.
Businesses that use this code
Activities listed under 541330
The Census index assigns these 31 activities to this code. If your business matches one, this is your code.
- Acoustical engineering consulting services
- Acoustical system engineering design services
- Audio visual system engineering design services
- Boat engineering design services
- Chemical engineering services
- Civil engineering services
- Combustion engineering consulting services
- Construction engineering services
- Consulting engineers' offices
- Consulting engineers' private practices
- Electrical engineering services
- Engineering consulting services
- Engineering design services
- Engineering services
- Engineers' offices
- Engineers' private practices
- Environmental engineering services
- Erosion control engineering services
- Geological engineering services
- Geophysical engineering services
- Heating engineering consulting services
- Industrial engineering services
- Logging engineering services
- Marine engineering services
- Maritime technology engineering services
- Mechanical engineering services
- Mining engineering services
- Petroleum engineering services
- Robotics automation engineering services
- Robotics engineering design and integration services
- Traffic engineering consulting services
SBA size standard for 541330
To count as a small business for SBA loans and federal contracts under NAICS 541330, your business (including affiliates) must not exceed $25.5 million in average annual receipts. Check your business.
| Activity | Size standard |
|---|---|
| Military and Aerospace Equipment and Military Weapons | $47 million |
| Contracts and Subcontracts for Engineering Services Awarded Under the National Energy Policy Act of | $47 million |
| Marine Engineering and Naval Architecture | $47 million |
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 7110), so treat them as a starting point and check the definition.
- 71111Architectural activitiesUK SIC
- 71112Urban planning and landscape architectural activitiesUK SIC
- 71121Engineering design activities for industrial process and productionUK SIC
- 71122Engineering related scientific and technical consulting activitiesUK SIC
- 71129Other engineering activitiesUK SIC
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.