Gurugram builders' fixed price is often a hidden cost trap

Budget finalised, loan pre-approved — now stuck on which sector. Sector 48 mein Bricksquare Developers ka 3BHK dekh raha hu. My wife wants good schools nearby. Gurugram mein negotiation kitna possible hai? Builder bol raha fixed price hai, but suna hai hidden charges bahut hote hain. All-in cost kya expect karun for a 2 Cr property? Yaar, possession pe koi surprise na mile.