Cubical extent definition
Cubical extent. , in relation to a building, means the space contained within the external surfaces of its walls and roof of a building and the upper surface of the floor of its lowest storey, excluding any space within any enclosure on the roof used exclusively for accommodating a water tank or lift gear or any other services, and, if any side of the building is not enclosed by a wall, that side shall be deemed to be enclosed by a wall extending downwards from the outer edge of the roof;
Cubical extent means the cubical extent of the building or, if the building is divided into compartments, the compartment of which the elements of structure form part;