Online, you can see pictures for 'detached house' 'semi-detached house' 'row housing'. Part of the problem with 'house' is the use as adjective. As in housing project, which are larger buildings, not houses. Equipment may have a 'housing', that is nothing at all like a house. Habitable buildings that are houses can range from single family, to multi-family, single floor, to multiple floors, detached, semi- or row houses.