This class includes cleaning of buildings of all types, including offices, factories, shops, institutions and other business and professional premises and residential buildings. It involves building interior cleaning, e.g. floor cleaning and waxing, interior wall cleaning, furniture polishing, etc., and window cleaning, inside as well as outside, for offices, industrial plants, factories and high-rise apartment buildings, chimney cleaning and cleaning of fire-places, furnaces, incinerators, boilers, ventilation ducts and exhaust units, etc. Also included are disinfecting and exterminating activities.

Exclusions: Steam cleaning, sand blasting and similar activities for building exteriors and cleaning of buildings after construction are classified in class 4540 (Building completion).

Carpet and rug shampooing and drapery and curtain cleaning are classified in class 9301 (Washing and (dry-) cleaning of textile and fur products).

Similar activities carried out by private households employing domestics are classified in class 9500 (Private households with employed persons).