I'm currently renovating and about to start on the living room, which is adjacent to my son's bedroom (both rooms in the corner of the house). My plans make things tricky but I'd like to make reductions where possible (I've attached a diagram to help illustrate). At the moment the stud wall in question (between room 1 & 2) is tiled, I had intended just to dot & dab another layer of soundbloc over the tiles (as attempts to pull other tiles away bring the plasterboard with them). The question is whether leaving the tiles would help or hinder sound reduction? The M-S-M theory of reduction would suggest it's ok (extra mass?) but not sure whether resonance etc would actually mean it's more of a transmission bridge. I can't afford the space to create another stud wall but I'd seen acoustic matting on ebay - does anyone have experience with this? Once complete I gather it's best to avoid screwing or fixing anything to the wall? (which would mean relocating a radiator, which isn't ideal). I was planning the same sound reduction between walls #2 and #3 - I'd like to wall mount the TV (so would have TV's on either side), but again the no fixings thing a bit of a sticking point. I'll also need to bring cabling through and get power points, so it's really a question of whether compromising the soundbloc'd wall makes the whole operation pointless? One side of that stud is still exposed - the joiner had filled it with Kingspan, however, reading suggests dense rockwool is a better option for noise reduction, so it sounds like I'd be better pulling that out? The final complication (that may make all other points moot) is the doors between 1 & 2 are only about 1.5m apart. We need to bring more light into the hallway, so I'm planning on putting french doors in #2, so we've got another (possibly worse) sound transmission problem there. Standard hardwood internal doors come with toughened glass, but I'm wondering if buying frames separately and fitting double-glazed panels would be advisable. I realise there's quite a few points there, so any thoughts/suggestions welcome!