think it depends on how the houses are built. we are in a detached and cant even hear much if we are in different rooms with the doors closed.
When we lived in maisonettes, we could hear downstairs but not nextdoor and when we lived in a semi-detached which was a fairly new build we could hear next door fairly clearly if they were shouting, or opening and closing cupboards, you could hear what they were saying if they were talking loud.
the place we live in now, is an older style bungalow and very sound proof. The walls are so solid that you cant even get an internet connection on the laptop unless you are in the lounge.