A scullery is a room in a house traditionally used for washing up dishes and laundering clothes, or as an overflow kitchen when the main kitchen is overloaded. Tasks performed in the scullery include cleaning dishes and cooking utensils (or storing them), occasional kitchen work, ironing, boiling water for cooking or bathing, and soaking and washing clothes. Sculleries contain hot and cold sinks, sometimes slop sinks, drain pipes, storage shelves, plate racks, a work table, various "coppers" for boiling water, tubs, and buckets.

The term "scullery", in a modern domestic context, appears to be somewhat archaic, the room being more commonly referred to (at least in North America) as a utility room or laundry room.

The term is, however, still to be found in modern use as an alternative term for kitchen in some regions of Britain, typically Northern Ireland, North East England and Scotland, or in designer kitchens.

In United States military facilities and most commercial restaurants, a "scullery" refers to the section of a dining facility where pots and pans are scrubbed and rinsed (in an assembly line style). It is usually near the kitchen and the serving line.

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.