Hidden charges make Noida Extension prices a lie

Okay I'll be honest — I completely underestimated how confusing this process is. I'm looking at a 2BHK in Noida Extension, specifically around Sector 145. Builders quote ₹70-80L, but then you add stamp duty, registration, PLC, parking, maintenance deposits... it just keeps climbing. What's the *real* all-in cost percentage I should budget for? Like, if the base price is ₹75L, how much extra for everything else? I'm worried about hidden charges, especially after hearing about projects like Krishna Vatika Society having surprises. How do you guys uncover all these costs *before* signing anything? Any specific things to ask about to avoid last-minute shocks?