He bought the flat underneath me and moved in around a year ago and it's been an absolute piss take since day dot.
He has a small terrier which yaps and barks incessantly for 20 minutes or so at a time. This is punctuated by him yelling it's name intermittently to shush it, to no avail.
He has the loudest phonecalls for up to an hour at least once every evening - I can hear him word for word.
Most evenings/nights and every weekend since he moved in, he has been doing some sort of noisy DIY. This can be anything from loud power tools which make my floor shake, to hammering and drilling, to the slightly quieter sanding and painting.
Occasionally (maybe once every six weeks or so) he gets absolutely pissed and blasts music in the middle of the night (3am-4am).
I rent and I think my only option is to move. I've been here for years and had several tennants live in that flat before it was sold - guitarists who practiced loudly but at reasonable times, a young couple with a baby who I could often hear crying or them bickering, the last one liked to yell at the tv when there was football on - all of which were a bit annoying but not intrusive or beyond what might be expected when living in a flat.
I doubt the police will be interested and I know that other neighbours have chapped his door and complained face to face but it doesn't seem to have changed things.
I have heard him being aggressive over the phone when drunk so a bit wary of pissing him off as I'm a lone female.
One night I lost it and thumped the floor repeatedly with a broom until he took the hint but I don't think that's a long term solution.