Architectural brief (space programme)

An architectural brief, or space programme, is the document that defines what a building has to contain before design begins. It lists the rooms and functions, their approximate areas, the number of users, and which spaces should sit together or be kept apart. For a house it may be a few lines of notes; for a hospital or school it becomes a detailed file describing hundreds of rooms.

How a brief is put together

A brief usually grows out of conversations between the client, future users and the architect. Needs are discussed first, then areas are estimated from comparable buildings and experience. Adjacency diagrams or bubble diagrams show which spaces should be next to which. When working out gross area, an allowance is added for corridors, walls and plant space, so the gap between the sum of net room areas and the real size of the building is visible from the start. Zoning rules and site conditions can limit the programme, which is why it should be tested against the plot’s capacity early on.

From brief to design

A clear brief is the foundation of concept design: the designer knows what has to be solved and can test options against it. As the architectural design process moves forward, the brief is revised. Showing early massing studies as simple 3D models is one of the easiest ways to explain to a client how the area schedule turns into actual volume.