Services to buildings and landscape activities Standard Industrial Classification (SIC) codes of UK-based importers and exporters 81100 - Combined facilities support activities (13246) 81210 - General cleaning of buildings (40272) 81221 - Window cleaning services (7922) 81222 - Specialised cleaning services (21930) 81223 - Furnace and chimney cleaning services (616) 81229 - Other building and industrial cleaning activities (9475) 81291 - Disinfecting and exterminating services (1772) 81299 - Other cleaning services (32069) 81300 - Landscape service activities (31903)