Architectural and engineering activities; technical testing and analysis Standard Industrial Classification (SIC) codes of UK-based importers and exporters 71111 - Architectural activities (25363) 71112 - Urban planning and landscape architectural activities (6166) 71121 - Engineering design activities for industrial process and production (16244) 71122 - Engineering related scientific and technical consulting activities (43250) 71129 - Other engineering activities (50949) 71200 - Technical testing and analysis (10598)