Gurgaon property buyers: What's the real all-in cost?

Golf Course Extension Road — had a site visit for a Bestech project there. Really liked it but ab samajh nahi aa raha hidden charges kitne honge. Builder ne bas basic price bataya. PLC, OC, legal, maintenance sab add karke true all-in cost kitna banega? Aur construction-linked payment plan mein kya catch hota hai? Any past experiences with these?