SIC code 71121 classifies businesses engaged in engineering design activities for industrial process and production. There are 8,630 active companies registered under this code in the UK, forming a substantial sector within the national economy. 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 Engineering design activities for industrial process and production industry page.
With a 89% survival rate, this sector shows strong business longevity. Only 8 of 9,665 companies registered under this code have dissolved, well below the UK average. Companies in this sector average 7.4 years old, reflecting a balanced mix of established businesses and newer market participants. Growth has been exceptional recently: 55% of all active companies were formed since 2020, marking this as one of the fastest-expanding classifications. The 2010s contributed another 34%, 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, ABERDEEN, GLASGOW — together account for just 16% of the sector.
SIC code 71121 stands for "Engineering design activities for industrial process and production" 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 8,630 active companies registered under SIC code 71121 in the UK, out of 9,665 total registrations. This gives a survival rate of 89%, meaning 11% of companies registered under this code have since dissolved. These figures are based on Companies House data and updated regularly.
The top locations for engineering design activities for industrial process and production companies (SIC 71121) are: LONDON (1,103), ABERDEEN (148), GLASGOW (138), WARRINGTON (133), MANCHESTER (124). Geographic concentration can reflect local economic conditions, industry clusters, or proximity to key markets and supply chains.
The sector is growing: 55% of currently active SIC 71121 companies were formed since 2020, and 34% during the 2010s. This sustained formation rate indicates ongoing demand for engineering design activities for industrial process and production services in the UK.
Companies classified under SIC 71121 have an average age of 7.4 years. This suggests a balanced sector with both established players and newer entrants. Notable companies include MAHLE POWERTRAIN LIMITED, POWER ELECTRICS (BRISTOL) LIMITED, PRIMETALS TECHNOLOGIES, LIMITED.
Related SIC codes within the same division include: 71129 (Other engineering activities), 71122 (Engineering related scientific and technical consulting activities), 71111 (Architectural activities), 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 71121 (Engineering design activities for industrial process and production) 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 8,630 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.