SIC code 71121 covers engineering design activities for industrial process and production activities in the UK, with 8,630 active companies currently registered. It falls under Section M (Professional, scientific and technical activities) of the UK SIC 2007 classification system. The average company age is 7.4 years.
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.
There are currently 8,630 active companies registered under SIC code 71121 in the UK, out of 9,665 total registrations (including dissolved companies).
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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.