SIC code 71129 covers other engineering activities activities in the UK, with 27,180 active companies currently registered. This represents a significant segment of UK business activity. It falls under Section M (Professional, scientific and technical activities) of the UK SIC 2007 classification system, which is used by Companies House to categorise all registered businesses.
See the full industry analysis on the Other engineering activities industry page.
With a 88% survival rate, this sector shows strong business longevity. Only 41 of 30,997 companies registered under this code have dissolved, well below the UK average. Companies in this sector average 7.9 years old, reflecting a balanced mix of established businesses and newer market participants. Growth has been exceptional recently: 53% of all active companies were formed since 2020, marking this as one of the fastest-expanding classifications. The 2010s contributed another 33%, meaning the vast majority of businesses are relatively new. Companies are geographically dispersed across the UK, with no single location dominating. The top three locations — LONDON, WARRINGTON, GLASGOW — together account for just 14% of the sector.
SIC code 71129 stands for "Other engineering activities" under the UK Standard Industrial Classification (SIC 2007) system. It belongs to Section M — Professional, scientific and technical activities. Companies use this code when registering with Companies House to indicate their primary business activity. The code is required for annual confirmation statements and is used by HMRC, ONS, and other government bodies for statistical and regulatory purposes.
There are currently 27,180 active companies registered under SIC code 71129 in the UK, out of 30,997 total registrations. This gives a survival rate of 88%, meaning 12% of companies registered under this code have since dissolved. These figures are based on Companies House data and updated regularly.
The top locations for other engineering activities companies (SIC 71129) are: LONDON (2,713), WARRINGTON (572), GLASGOW (430), ABERDEEN (413), MANCHESTER (328). Geographic concentration can reflect local economic conditions, industry clusters, or proximity to key markets and supply chains.
The sector is growing: 53% of currently active SIC 71129 companies were formed since 2020, and 33% during the 2010s. This sustained formation rate indicates ongoing demand for other engineering activities services in the UK.
Companies classified under SIC 71129 have an average age of 7.9 years. This suggests a balanced sector with both established players and newer entrants. Notable companies include MOTT MACDONALD LIMITED, FRAZER-NASH CONSULTANCY LIMITED, COWI UK LIMITED.
Related SIC codes within the same division include: 71122 (Engineering related scientific and technical consulting activities), 71111 (Architectural activities), 71121 (Engineering design activities for industrial process and production), 71200 (Technical testing and analysis). Companies may use multiple SIC codes if they operate across several of these related activities. When registering with Companies House, businesses should select the code that best represents their primary activity.
You can search for companies with SIC code 71129 (Other engineering activities) using UVAGATRON's company explorer, which allows filtering by SIC code, location, and company status. Alternatively, Companies House offers a basic search on their website. Our platform adds risk intelligence, director networks, and signals from 50+ government databases to each company record.
Search, filter, and analyse 27,180 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: 2026-04-17.