Real estate insider, Sohna buyer: Still surprised by costs

Been in real estate for years, but buying my own 3BHK in Sohna is a whole new ball game. I'm looking at places around Badshahpur, maybe Sunder Homes. My budget is around ₹1.5 Cr for a 3BHK, but honestly, the actual cash out of pocket feels way higher. I know what builders don't tell you upfront. The quoted price is one thing, but then there's stamp duty. That 5-7% on top for registration and all... it's a massive chunk, easily ₹7.5-₹10.5 lakhs on a ₹1.5 Cr property. It really changes the math. How do you guys factor that into your initial budget? Is there any way to... manage that cost or get a clearer picture of the final, *final* amount, especially when prices are already steadily rising? Feels like a hidden tax almost. Any advice on not getting surprised at the very end?