Wall / floor area ratio

- Wall / floor area ratio expressing the planning effiency of a building and influnced by size , plan shape and storey height of the building . - Ratio is calculated by diving the external wall are ( inclusive door and window ) by gross floor area . - The lower the wall . floor area ratio , the more economical will be the proposal . - The best wall / floor area ratio is produced by circular building but the cost is offset by a higher circular work .