A building should be considered a residential building when more than half of the floor area is employed for dwelling purposes. Other buildings should be considered non-residential.

A residential building is one that is designed and accordingly built for inhabitants to measure in and call House. Inhabitants can either be a family, single, a couple, roommates or may be in a group. A residential building has basically:

• - A sleeping room(bedroom)/space,
• - A living room/space,
• - Conveniences (as in toilet and bath),
• - Cooking room/area (kitchen).

All of those functions can either be in shared rooms or spaces or have exclusive rooms per function. These types of buildings include one or two private dwellings, apartment houses (flats), bungalows, duplexes, storey houses, terrace buildings, apartment buildings, condominium buildings, hotels, dormitories, semi-detached buildings, etc.

Source: https://dailycivil.com/types-of-buildings/