 This would mean that a 4-story home could be built using 70% of the land.Thus, for a maximum allowable coverage ratio of 50%, the greatest building footprint allowed for a lot of 100m2 would be 50m2.Floor area ratio is the total floor area of the house (excluding the roof and basement) as compared to the area of land the house is built upon; for a maximum FAR of 150%, the greatest possible total floor area for a house built on a 100m2 lot would be 150m2.