The cost method: Where the current cost of construction of the building is estimated and then the current cost is reduced by the depreciation according to the age of the building. To this depreciated value of the building, the price of the side is aggregated to arrive at the valuation of the property.
-In case of an independent house, the total useful age is estimated to be about 60 years. Suppose you are selling it after 20 years of construction, selling price of the building minus depreciation is arrived at by this simple formula- Number of years after construction/ Total (useful) age of the building.i.e. 20/60 = 1/3 is the ratio