My 2BHK possession trauma and the next upgrade

Hidden charges from builders are just daylight robbery, honestly. My 2BHK from Shri Nilyam Infra in Sector 22-D had so many surprise costs at possession. Now I'm eyeing a 3BHK, but I'm worried about more hidden fees. How do people account for these random maintenance deposits or PLC that pop up last minute? What's the real all-in cost for a 3BHK in Noida nowadays?