UK SIC 2007 code in Section N: Administrative and support service activities
80300 Investigation activities
SIC 80300 is the UK code for investigation activities. Companies House accepts it when you register a company or file a confirmation statement.
- Code
- 80300 (UK SIC 2007, Companies House list)
- Section
- Section N: Administrative and support service activities
- Division
- 80 Security and investigation activities
- SIC 2026
- 80.01 Investigation and private security activities (1:1)
- Closest US NAICS
- 541990, 561611
Activities ONS lists under 80300
The ONS index assigns these 6 activities to this code. If one describes your company, this is the code to use.
- Enquiry agency
- Inquiry agency
- Internet abuse monitoring
- Investigation activities
- Private detective
- Private investigator activities
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 (80.30) to:
| SIC 2026 code | Heading | Link type |
|---|---|---|
| 80.01 | Investigation and private security activities | 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 80300 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.
Data last changed November 14, 2026. Source: Companies House condensed SIC list. How this page is built.