Budget finalised, loan pre-approved — now stuck on true costs for a 3BHK upgrade

Budget finalised, loan pre-approved — now stuck on true costs for a 3BHK upgrade. Currently in a 2BHK in Vasundhara, eyeing Muradnagar. Yash Promoters ka project dekh raha tha. Base price sahi hai, par stamp duty aur registration kitna add karte hain? Is the total jump from ₹70L to ₹1.1Cr worth it? Kya in charges pe negotiation possible hai?