A buttery was a domestic room in a large medieval house. Along with the pantry, it was generally part of the offices pertaining to the kitchen. Reached from the screens passage at the low end of the Great Hall the buttery was traditionally the place from which the yeoman of the buttery served beer from the wooden butts standing by to those lower members of the household not entitled to drink wine. Candles were also dispensed from the buttery. Even today in Oxford and Cambridge colleges drinks are served from the buttery bar. The buttery generally had a staircase to the beer cellar below. The wine cellars, however, belonged to a different department, that of the yeoman of the cellar and in keeping with the higher value of their contents were often more richly decorated to reflect the higher status of their contents.

From the mid-17th century, as it became the custom for servants and their offices to be less conspicuous and sited far from the principal reception rooms, the Great Hall and its neighbouring buttery and pantry lost their original uses. While the Great Hall often became a grand staircase hall or large reception hall, the smaller buttery and pantry beyond the hall screens were often amalgamated to form a further reception or dining room.

A room is any distinguishable space within a structure. Usually, a room is separated from other spaces or passageways by interior walls; moreover, it is separated from outdoor areas by an exterior wall, sometimes with a door. Historically the use of rooms dates at least to early Minoan cultures about 2200 BC, where excavations on Santorini, Greece at Akrotiri reveal clearly defined rooms within certain structures.

In early structures, diverse room types could be identified to include bedrooms, kitchens, bathing rooms, reception rooms, and other specialized uses. The aforementioned Akrotiri excavations reveal rooms sometimes built above other rooms connected by staircases, bathrooms with alabaster appliances such as washbasins, bathing tubs, and toilets, all connected to an elaborate twin plumbing systems of ceramic pipes for cold and hot water separately. Ancient Rome manifested very complex building forms with a variety of room types, including some of the earliest examples of rooms for indoor bathing. The Anasazi civilization also had an early complex development of room structures, probably the oldest in North America, while the Maya of Central America had very advanced room configurations as early as several hundred AD. By at least the early Han Dynasty in China (e.g. approximately 200 BC), complex multi-level building forms emerged, particularly for religious and public purposes; these designs featured many roomed structures and included vertical connections of rooms.