floorstorey

Floorstorey is not a standard architectural term. In practice, the level concept is usually expressed as storey (British English) or story (American English). The word floor more often refers to the actual horizontal surface you walk on, or, informally, to a level of a building. A building is divided into multiple storeys stacked vertically, with each storey containing spaces such as rooms, corridors, and amenities, bounded by a floor slab above and a ceiling below.

A storey is typically defined by its floor-to-floor height, the structural floor system, and its enclosing walls. Heights vary by function and jurisdiction, but modern habitable storeys commonly range from about 2.5 to 4 meters. Some storeys are entirely inhabited, while others are used for services, such as mechanical or electrical equipment, and are referred to as mechanical or plant floors.

Naming and numbering conventions differ by country. The ground level is often called the ground floor in Commonwealth countries or the first floor in the United States, with subsequent levels numbered accordingly. Basements lie below ground level and mezzanines represent partial storeys within a larger floor-to-ceiling height. In tall buildings, certain storeys may be reserved for services, while the topmost storey might be designed as a penthouse or a roof-access level.

In construction and design, storey height, floor area, fire separation, acoustics, and vertical transport are key considerations. The term floorstorey may appear in informal writing or cross-language contexts, but the established terms storey/story and floor are preferred in professional usage.