Hyderabad property cost is never just the sticker price

Kokapet prices are high. I'm in a 2BHK, thinking of upgrading to a 3BHK. Builders like Salarpuria Sattva, kitna negotiation possible hai? All-in cost mein kya hidden charges hote hain? Not sure if that 1.5 Cr for a 3BHK is final, ya aur upar jayega. Any actual savings possible?