Division 71 of the UK SIC 2007 list. It holds 6 codes, listed in full below with the number of active UK companies filed under each.
Architects, engineers and technical testing labs share this division. Engineering leads on numbers. Code 71129 holds general engineering activities. Code 71122 covers scientific and technical consulting. Code 71121 covers design work for industrial process and production. Architecture splits in two: 71111 for architectural practices and 71112 for urban planning and landscape work. Code 71200 marks testing and analysis houses, from materials labs to environmental testing. Many entries are chartered professionals in small limited companies. Established multidisciplinary firms sit alongside them.
Construction supply chains drive most of the selling here. Main contractors and developers search these codes to find design partners. Software vendors sell CAD, BIM and project tools. Insurers push professional indemnity, which every practice has to carry. Recruiters work the engineering codes hard, because demand for chartered engineers beats supply. A new incorporation often means a senior engineer or architect has left a big practice with clients in tow. Steady filings plus visible growth mark the firms winning places on frameworks.
71111, Architectural activities71112, Urban planning and landscape architectural activities71121, Engineering design activities for industrial process and production71122, Engineering related scientific and technical consulting activities71129, Other engineering activities71200, Technical testing and analysisA design practice belongs under 71111, or 71112 for planning and landscape work. Division 41 and 43 codes describe businesses that physically build. Companies House does not police the choice. One thing does matter: the title architect is legally protected in the UK by the Architects Registration Board. Only ARB-registered individuals may use it, whatever SIC code the company holds.
Most consulting engineers pick 71122 for scientific and technical consulting. Code 71121 suits industrial and production design. The broader 71129 works when neither is a clean fit. The choice is yours. Codes are self-declared at incorporation and amendable on any confirmation statement (CS01). A company can carry up to 4, so many practices pair an engineering code with a project management or testing code.
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