Just be louder and worse
Still haven't found out what the horrible old man next door doesn't like music wise... His hateful lodger hates a the hammer banging so it's an easy win to try and push him over the edge with
Agree, had to endure awfully loud neighbours so I just installed surround sound in the living room and I whacked the volume up constantly and placed the speakers right next to the party wall, and now I am in the process of fully renovating the entire house, in order to sell up and move on.
The drilling and banging noises have in fact really get under their skin, as twice they have now asked to reduce this noise, and twice I've told them I am conducting construction work under permitted noise regulations, for DIY this includes weekends from 9am - 6pm and that has given me great satisfaction - the noise next door has dropped off a lot lately when it was pointed out they make as much noise and can be easily heard, could hear them arguing, talking loudly and the lot.
I also wonder if playing PC games in the living room like Doom internal at a bloody good volume annoyed them - hope so.
Anyhow, we have now put up 12.5 mm plasterboard to 50mm battens with rockwool between the battens and floor joists everywhere, its made a small difference but honestly just installed rockwool as i can get it very cheaply from where I work, and considering I have had to re plaster board and reskim and batten ALL external and party walls and ceilings in the house, to get this done by plastering crew and supplies, would be EXTREMELY expensive, I have done it as I can plaster skim and get all materials at very good prices and its helped muffled the sounds from next door, but not removed it, and they have also quieten down themselves as i do think the noise I was making has made them realise - you can really hear more then you realise through walls.
Plastering + board , skim more so is expensive if you can't do this yourselves plus the cost of 50mm rockwool and the plaster boards, and labour its not a cheap thing to do and it doesn't give total sound proofing anyhow .