Yes there are a few relatively simple things that can be done to vastly improve sound isolation in wood frame buildings. They do cost a little bit so many buil

Yes there are a few relatively simple things that can be done to vastly improve sound isolation in wood frame buildings. They do cost a little bit so many builders don't do them. For isolation between rooms the walls can be built with "a hollow core", which means there are, in effect, two separate walls, each facing their respective room with almost no pieces of wood joining the two walls. It's the wood that normally is touching both walls that allows sound transmission. Secondly the "gyp rock" sheets that create the wall can be stood off from the timbers they're anchored to to further improve sound isolation. For sound isolation between floors it's possible to lay down about four centimeters of concrete over the wood floor and this hugely improves sound isolation. Obviously these increase costs but they do really work and probably don't increase cost by more that 5 to 10 %.