Service tax on house under construction

Hi, I have one query and will be highly grateful if anyone can please reply back: I bought an under construction independent house(2 floors) in jan 2012 and got it registered in october 2012 with the worth less than 20 lacs having area 134 sq yards(112 sq m). Now in 2013 when the house is almost complete and time has come to provide possession, builder is asking for a service tax. Please let me know as per the latest rules of service tax and its exemption, am I really liable to pay any service tax here.