 Estimates of the cost of construction vary due to difficulties in estimating costs across time.The total cost at the time has been estimated to be about 32 million Indian rupees, which is around 52.8 billion Indian rupees ($827 million US) based on 2015 values.Abdul Hamid Lahauri in his book "Badshahnama" refers to Taj Mahal as "rauza-i munawwara" (Perso-Arabic