House Lot Grading. Generally, all lots shall be excavated or filled so that the whole of the lot area from the street line to a line at least 3 metres beyond the rear of the building shall have an elevation not less than 0.5 metres or more than 2 metres higher than the finished crown of the road opposite the centre of the lot. In situations where the slope of the land justifies different requirements, the Director of Infrastructure and Development may permit variations of the above. A plan showing proposed lot grades and house floor levels shall be submitted to the Director of Infrastructure and Development for his approval, and the Director retains the right to amend any of the grades proposed if the Director considers a particular situation so warrants.