Gurgaon's hidden charges always surprise buyers

Gurgaon mein all-in cost hamesha surprise deti hai. Fed up of renting, I'm finally buying near DLF Phase 1. Builders like SS Group, they spring up so many hidden charges near possession. Stamp duty, registration ke alawa kya-kya hota hai? Budget tight, can't afford last-minute shocks. Any advice on spotting these early?