Advice on sound proofing a room please

[tiredsleepysleep]

Please can anyone advise on costs and types of sound proofing? I want to sound proof between me and next door neighbour (semi detached). I don't know where to start. I've googled but I'm not very DIU savy and don't know what to do for the best.
Thank you

This is a big advert, but may at least show what it needs:

If you can afford to lose a bit of space then you can double wall.

This video is by a renovation guy (he is a contractor in the US) and the first half of the video is soundproofing the ceiling as he is working in a basement but it does explain about offsetting joints.

But the bit I have linked you from is understanding walls. Yes the above video shows you how to reduce the noise coming through, but my video shows you how you can reduce it much further.

You need to decouple and add mass.

If you have chimney breasts or solid internal walls connected to your party wall the results will be less. I have all of these issues so I sound proofed 1 room not knowing how it would work. Plus soundproofing a chimney breast whilst continuing its function in a legal way is a head scratcher which no company would guarantee results.

I put in system called mute clip stud double plus by ikoustic. And it’s made a 20db sound improvement. I’d now have to be sitting in silence to hear next door and then it’s just a faint murmur rather than hearing actual words of tv shows.

Other systems should be similar as good as long as they separate your new wall from existing. It cost me £1600 in all £1100 materials/ £500 plastering and skirting)excluding all the coving matching which I’m still to do. I did it myself minus the plastering. I got several quotes from other companies who wanted £3500-£4500 a room! To including plastering but not matching the coving. It took me and a friend 3 days to do.

My parents had a lesser system of just a separate stud wall but no connecting internal walls or fire places to add flanking sound paths. They’ve reduced neighbour noise to the point you’d have put your ear to the wall to hear them.

All these slim line stick to wall systems you see in my opinion will get minimal results. Try it for yourself put your ear to the wall you hear the sound easier. Put a large book between your ear and the wall, not much difference. All that extra mass of the book does nothing! You need separation I.e your ear not against the wall for a meaningful reduction in sound.

It also depends on what type of noise, airborne such as TV, voices etc or impact, doors, windows etc being slammed, bangs. Impact noises are almost impossible to get rid of with retro fitting soundproofing unless you did the room within a room type, huge expense and upheaval.

I had massive problems in my previous place which was a ww1 concrete and steel prefab, I ended up moving.