I am a new homeowner and this is my first post to this group. We were living in leased apartment before this and now moved to a two floor house. The problem is if my husband is working in the kitchen or watching TV etc on the lower floor, I can hear all the sound in the bedroom on upper floor. If I close the door of bedroom its fine. I always thought there would be some sound proofing between different floors. Is it normal to hear sounds like this in house or is there something wrong built/missed in this house?
Such is the down side of hard floors; they aid in sound transmission. Carpets used to absorb this, but nobody likes carpet any more.
There is no building code requirement for sound proofing between floors. It is often done as a "feature", but not having it is not indicative of something being "wrong" with the construction.
You might try making some acoustical panels and hang 2-3 in your upstair and stairway. Here a good video on how you might accomplish this on-the-cheap.