What's the real all-in cost for a 3BHK in Saket?

I'm in Dubai, eyeing a 3BHK in Saket. Property Mart ka ek project dekh raha hoon. Builders initial quote ke baad, kitna extra lag jaata hai for stamp duty, PLC, and hidden charges? Total cost quoted price se kitna upar jaati hai, especially for interiors? Investor perspective se, I need to know the actual outgo.