UK SIC 2007 code in Section M: Professional, scientific and technical activities
71129 Other engineering activities
SIC 71129 is the UK code for other engineering activities, part of the class "engineering activities and related technical consultancy". Companies House accepts it when you register a company or file a confirmation statement.
- Code
- 71129 (UK SIC 2007, Companies House list)
- Section
- Section M: Professional, scientific and technical activities
- Division
- 71 Architectural and engineering activities; technical testing and analysis
- SIC 2026
- 71.12 Engineering activities and related technical consultancy (1:1)
- Closest US NAICS
- 541310, 541320, 541330, 541340 and 3 more
Activities ONS lists under 71129
The ONS index assigns these 27 activities to this code. If one describes your company, this is the code to use.
- Acoustical engineering design
- Architectural engineering activities
- Building structure design for ancillary services
- Chartered Building Surveyors
- Chemical engineering design projects
- Consultant civil or structural engineer
- Consultant engineer (civil or structural)
- Corrosion engineering activities
- Design consultant for civil and structural engineering
- Design office for civil and structural engineering
- Electrical and electronic engineering design projects
- Engineering contractor responsible for complete process plant
- Engineering design activities for the construction of civil engineering works
- Environmental engineering consultancy activities
- Geotechnical engineering consultancy activities
- Heating systems for buildings design activities
- Hydraulic engineering design projects
- Integrated engineering activities for turnkey projects
- Jacket substructure design and other foundation design services
- Mechanical and electrical installation for buildings design activities
- Mechanical, industrial and systems engineering design projects
- Mining engineering design projects
- Pipeline design activities
- Process engineering contractor
- Project management
- Traffic engineering design projects
- Water management projects design
Source: ONS UK SIC 2007 alphabetical index.
Businesses that use this code
What changes in SIC 2026
ONS published UK SIC 2026 in 2026. Its correspondence table maps this code's class (71.12) to:
| SIC 2026 code | Heading | Link type |
|---|---|---|
| 71.12 | Engineering activities and related technical consultancy | 1:1 |
"1:1" means the class carries over unchanged in scope; other link types mean it was split or merged. Companies House still uses SIC 2007, so keep filing with 71129 until it announces a switch.
Closest US NAICS codes
Matched through the shared international class (ISIC Rev. 4). Treat these as a starting point and read the definition before using one.
Similar codes to compare
Data last changed November 14, 2026. Source: Companies House condensed SIC list. How this page is built.