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it's largely pointless or expensive, compared to getting the neighbour to dampen noise at source
This.
Speaking from experience*, you would be throwing your money away and the changes from getting used to it plus your neighbour eventually moving out (especially if its rented) are orders of magnitude more effective and also free.
*strictly speaking my experience is of an acoustic wall lining attempt to mitigate airborne noise transmission, not regarding impact noise
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When I looked in to it, ages ago and not very thoroughly, a false ceiling hung from the walls + insulation was the best bet. Never did it though. Looking back I wish I'd done some work to the underside of the creaky-ass stairs. Recently battoned, glued and screwed my current victorian staircase from below and they're virtually silent now. The upstairs neighbor coming in at one and going up those things would always wake me up.
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Congratulations!
Whatever you do, if it involves speaking to neighbours, do it ASAP. The longer you leave it the harder it will be. We lived with it for 6 years in the last place. For the most part, it was totally reasonable walking around. But there was the odd activity (weights bench in their bedroom) that got really bad. I left it for too long to be able to reasonable have a friendly word. The chance of them either not realising then appreciating the heads up Vs them being totally inconsiderate sociopaths who don't care about what they do to others quiet enjoyment changes exponentially over time.
Just completed on my first flat. I'm over the moon after saving for ~6 years.
The only big drawback for me is that it's an old building and I have an upstairs neighbour, so I get a lot of footsteps noise (I knew this going in). Anyone have any experience of sound proofing from upstairs impact noise? I don't get any airborne noise. I get the impression that it's largely pointless or expensive, compared to getting the neighbour to dampen noise at source, but I have over 3.5m high ceilings so plenty of space for sub ceiling if needed.