Mortgage Closing Cost are a series of additional costs in addition to the purchase of your home. These expenditures will likely account for 1.5%-4% of the homes total cost. As an example, if you are spending $810,000 on your new home, expect your closing costs to be anywhere from $12,150 - $32,400. In most cases, closing costs are due upon the official transfer of property from seller to buyer. There are times however, when some or all would be due before the closing date.