Selling big house, finding compact home in Hyderabad

Since last Diwali, I've been trying to find a compact 2BHK in Hyderabad. Kids moved out, selling our big house. Builders quote one price, but stamp duty, registration, PLC, parking sab add ho jaata hai. Salarpuria Sattva ke paas dekha. Super area/carpet area difference bhi bada laga. What's the real all-in cost for a 3BHK near Hitech City? Yeh super area ka chakkar kaise avoid karein?