Sohna property: Hidden charges always surprise you.

Our old house is finally sold, now looking for a smaller, manageable place in Sohna. Kids have moved out, toh ab itna bada ghar nahi chahiye. Humne ZAK Spaces ke 2BHK dekhe hain Sector 1B mein, around ₹1.2 Cr ka quote mila hai. But I'm really worried about hidden charges. Kya construction quality issues ya unexpected costs aate hain possession ke time, like club membership, power backup, ya even extra PLC? Kya logon ne experience kiya hai? Is there any way to avoid these surprises?