Hi guys. Problem as described. My house second floor can hear neighbor next door.

The screaming I dont mind la, but sometimes sound of kids playing, door closing, loud chit chat can be heard from ceiling.

I don't think this is normal, unless current new house quality is so s💩y. Never experience such thing in any terrace house in my life.
A little bit background, house is still new and under DLP.

Anything I can do? And if register as defect (definitely will do) what can be done?

Thank guys.

Check if the party wall is all the way up to the roof, view via the ceiling access panel (normally at toilet) and use torchlight.
There is unfortunately no by law on sound in Malaysia, so can it be considered defect...