I moved into a Persimmon (Hatfield design) house earlier this year.
We soon noticed we could hear the boiler and washing machine through the wall separating the lounge and utility rooom and later noticed noise from the WC on the other side of the same wall.
The boiler is actually fixed to the other side of the wall, which is a simple stud partition. I've checked with Premier, the warranty company, and have just been advised that the section of the wall separting the WC should contain some sound insulation.
I can see that at least the part directly behind the WC doesn't. I've not yet been back to Persimmon but they have previously stated they have not had this problem with this house type before which I find odd as the boiler and washer in particular are clearly audible.
I wondered if anyone else on the forum had had similar issues? Thanks in advance.