Paragraph 3
The features to be included when measuring the area of a floor in accordance with paragraph 2 are:
(a)
perimeter wall thicknesses and external projections;
(b)
areas occupied by internal walls and partitions;
(c)
columns, piers, chimney-breasts, stairwells, lift-wells and similar structures;
(d)
lift rooms, plant rooms, tank rooms and fuel stores;
(e)
garages (whether detached or not) and open-sided covered parking areas; and
(f)
outside water or earth closets.