My 3BHK hunt: The hidden costs that blindside you

Spent the whole Sunday checking out options in Sector 24C. Honestly, I'm so fed up of renting, my landlord just raised rent again. Finally taking the plunge for a 3BHK, thought I had my budget sorted, around ₹1.2 Cr. But yaar, builders quote one price, and then suddenly there's PLC, then parking charges, then OC. Feels like a trap, these hidden costs just pop up. I mean, the base price for a 3BHK was okay, but then these extras... it just pushes the EMI vs rent math way off. Did anyone else face this? Is there any way to negotiate these 'mandatory' charges? Or should I just factor in an extra 10-15% over the quoted price as standard in Chandigarh? Matlab, kitna paisa aur lag jayega, not sure.