Hidden costs buyers only discover after possession

Budget finalised, loan pre-approved — but Palam Vihar mein 2BHK dekh ke dimag kharab ho gaya hai. Honestly, builders ki marketing brochures kuch aur dikhati hain aur actual cost kuch aur. I'm looking at places in the ₹80L-1.5Cr range, but har project mein koi na koi extra charge nikal aata hai. Like maintenance, PLC, ya parking ke naam pe last minute pe ₹2-3 lakh extra maang lete hain. Mera current 2BHK in Sector 70 mein bhi yehi hua tha, toh I'm super careful now. Is it just me, ya sabke saath yehi ho raha hai Palam Vihar mein? How do you guys factor in these hidden costs while deciding if a project is a good investment? Koi real experience share karega?