A room or a group of related rooms, among similar sets in one building, designed for use as a dwelling.a building containing or made up of such rooms.any separated room or group of rooms in a house or other dwelling:We heard cries from an apartment at the back of the house.apartments, British. a set of rooms used as a dwelling by one person or one family.

A relatively permanent enclosed construction over a plot of land, having a roof and usually windows and often more than one level, used for any of a wide variety of activities, as living, entertaining, or manufacturing.anything built or constructed.the act, business, or practice of constructing houses, office buildings, etc.

Interior design is the art and science of enhancing the interior of a building to achieve a healthier and more aesthetically pleasing environment for the people using the space. An interior designer is someone who plans, researches, coordinates, and manages such enhancement projects.