bikergran
We bought a new build 22 yes, ago, it's a bit like the old fashioned back to back ( I am at the rear)
Never again would I have a new build, my neighbour at the mo is fine, young lad about 35 ish,he's been here about 9 yrs, not noisy but does have tv/ games thingy up loud. Can hear him talking on phone. But would never complain as he is a good neighbour.
Previously we have had other neighbours, most of them really noisy all the time, well maybe they were just living normal life, but walls so thin, could hear TV, hoover, talking, door knocking, doors opening and closing etc. I would much prefer old styly semi like we used to have.
There is a huge difference in the insullation in houses built 22 years ago and houses built in the past 11 years. My terraced, 11 year old house is so well insulated that it seems like living in a detached house in the middle of a field. 
Previously I have lived in detached houses, except for our first house (semi detached, 1960's) we could hear a little from next door, but not enough to be intrusive. My daughter's home is a four storey, Victorian terrace. They hear their neighbours', especially on the stairs and in particular, the opera singer on one side, when he is rehursing. 