SIC code 43999 (Other specialised construction activities n.e.c.) is one of the most widely used business classifications in the UK, with 48,038 active companies registered under this code. It falls under Section F (Construction) of the UK SIC 2007 classification system. The average company age is 9.5 years. The leading locations are BASILDON (207) and MIDDLESBROUGH (207).
See the full industry analysis on the Other specialised construction activities n.e.c. industry page.
SIC code 43999 stands for "Other specialised construction activities n.e.c." under the UK Standard Industrial Classification (SIC 2007) system. It belongs to Section F — Construction. Companies use this code when registering with Companies House to indicate their primary business activity.
There are currently 48,038 active companies registered under SIC code 43999 in the UK, out of 56,267 total registrations (including dissolved companies).
The top locations for companies classified under SIC 43999 are: BASILDON (207), MIDDLESBROUGH (207), DAGENHAM (196). These areas represent the highest concentration of other specialised construction activities n.e.c. businesses in the UK.
Search, filter, and analyse 48,038 companies classified under this SIC code with AI-powered risk intelligence.
Data sourced from Companies House, HM Land Registry, FCA Register, and 50+ government databases. SIC classification follows the UK Standard Industrial Classification of Economic Activities 2007 (SIC 2007). Last updated: 2026-04-05.