Noida Extension mein final costs: Any surprises?

INR 1.5 Cr for a 3BHK in Sector 150 from Godrej Properties looked like a good option, especially with the Jewar Airport infra. I'm based in Dubai, so site visits are tough, relying on community info. My biggest worry is hidden charges. Builder reps often gloss over PLC, IDC, and maintenance deposits. A relative who bought with ACE Group faced a shock at possession – registry ke time bahut extra amounts demand kiye. Is this normal practice in Noida Extension? Are builders like ATS or Mahagun transparent about all costs upfront? I can't handle last-minute surprises, especially managing things remotely. What was your experience with final costs?