Floor plan
A scaled orthographic drawing of interior spatial relationships at one level.
A floor plan is a technical or diagrammatic drawing that illustrates the horizontal relationships of interior spaces or features at one level of a structure. Typically drawn to scale and in orthographic projection, floor plans represent relationships without distortion and are usually drawn approximately 4 ft (1.2 m) above the finished floor, indicating the direction of north. The level of detail included on a floor plan is directly tied to its intended use and phase of design, ranging from schematic designs showing major space divisions and approximate square footages to construction documents specifying wall types, fixtures, and finishes. Objects below the cutting plane are visible; those at the plane are shown cut in section, while elements above it are omitted or shown dashed. The practice of constructing ground plans, known as ichnography, was first described by the Roman architect Vitruvius. This method involves a geometrical projection or horizontal section taken at a level that reveals outer walls, doorways, windows, fireplaces, wall thicknesses, and the positions of piers, columns, or courtyards, all drawn to scale. A floor plan serves as the typical starting point for interior design projects. Variations include the reflected ceiling plan, which shows the ceiling as if viewed from above through a mirror, and 3D floor plans, which use perspective rather than orthographic projection to convey depth and scale, often with furniture. Simplified plan diagrams are used for non-technical information such as fire exit locations, circulation patterns, or programmatic arrangements, primarily during design or presentation phases.
- field
- Architecture and building engineering
- known_for
- Technical drawing illustrating horizontal relationships of interior spaces at one level of a structure
- typical_vertical_position
- Approximately 4 ft (1.2 m) above the finished floor
- projection_type
- Orthographic projection
- orientation
- View from above, similar to a map
Lore & Background
The art of constructing ground plans, known as ichnography, was first described by Vitruvius and included the geometrical projection or horizontal section representing the plan of any building, taken at such a level as to show outer walls, doorways, windows, fireplaces, and the correct thickness of walls, as well as the position of piers, columns, courtyards, and other features. A plan view is defined as a vertical orthographic projection of an object on a horizontal plane, like a map, and in the case of a floor plan, the roof and upper portion of the walls may typically be omitted to reveal what lies beyond.
Reader's Guide
Floor plans serve as a fundamental tool in architecture and building engineering, providing a standardized method for depicting the internal arrangement of a three-dimensional structure in two dimensions. They are typically the starting point for any interior design project and are used throughout the design process, from schematic phases to construction documentation. Variations include reflected ceiling plans, which show a view as if looking from above through a mirror below the ceiling, and 3D floor plans, which use perspectival representation to convey layouts to those unfamiliar with traditional plans. Simplified plan diagrams may indicate non-technical information such as fire exit locations or circulation patterns. The level of detail in a floor plan is directly tied to its intended use, with construction plans including specific dimensions, wall construction types, fixture details, and symbols for electrical items.
Did You Know?
- Floor plans are typically drawn approximately 4 ft (1.2 m) above the finished floor.
- Objects below the cutting plane are seen, objects at that level are shown cut in plan-section, and objects above are omitted or shown dashed.
- The term 'floor plan' may also denote the arrangement of displayed objects at an exhibition or exhibitor booths at a convention.
- 3D floor plans are perspectival representations, often produced using a digital model and rendered to show better depth of image.
More in Architectural Styles And Landmarks 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record