A loft is a building's upper storey or elevated area in a room directly under the roof (American usage), or just an attic: a storage space under the roof usually accessed by a ladder (primarily British usage). A loft apartment refers to large adaptable open space, often converted for residential use (a converted loft) from some other use, often light industrial. Adding to the confusion, some converted lofts themselves include upper open loft areas. In US usage, a loft is an upper room or storey in a building, mainly in a barn, directly under the roof, used for storage (as in most private houses). In this sense it is roughly synonymous with attic, the major difference being that an attic typically constitutes an entire floor of the building, while a loft covers only a few rooms, leaving one or more sides open to the lower floor. In British usage, lofts are usually just a roof space accessed via a hatch and loft ladder, while attics tend to be rooms immediately under the roof accessed via a staircase. Lofts may have a specific purpose, e.g. an organ loft in a church, or to sleep in (sleeping loft). In barns a hayloft is often larger than the ground floor, since it would store a year's worth of hay. An attic or loft can often be converted to form a functional living accommodation (see Loft conversions in the United Kingdom). In modern Norwegian and in English, "loft" is used for the upper room or the space just under the roof in larger buildings. The word originates from Old Norse lopt, loft which also could mean air or being elevated (as in the related word løfte, English "to lift"). In older Scandinavian usage, loft referred to a two-storey unheated building used for storage and bedroom, in contrast to dwelling buildings that were one-storey with a fireplace. Loft apartments are apartments that are generally built from former industrial buildings. When industrial developments are developed into condominiums instead of apartments, they may be called loft condominiums.