Horse House is a term used to describe the various structures used to house horses. The most common of these structures are barns, stables, and stalls. A BARN is a large structure typically made of wood or metal that is used to store hay, grain, and other supplies for horses. Stables are smaller structures that are used to house horses and provide them with shelter. Stalls are individual enclosures within a STABLE that are used to house one horse at a time.