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Don't know if it's reasonable but my gut feel is its expensive, however if the work is done well then it may be worth it because I suspect getting the soundproof right is going to be dependent on both detailing and execution of the work. Also, it's probably going to not work as well as you want even if it's done very well. I've tried doing this and it helped to some degree but didn't solve the issue completely.
[Editied to make concise]
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@Cupcakes cheers for the input. Just re-read the quote and knock ~2k off that - there are 2 options to go for and I added both up. Helping a bit would be good because it is awful at the moment. Not my problem long term though
I don't own the house I rent but helping the live in (when he's not in Portugal, so 2 weeks of the last 6 months) Landlord with a soundproof quoting. Had a quote of 5k ISH to do 1 wall in Bristol (front of the house is just corridor, so leaving that, and upstairs backs on to a spare bedroom and bathroom only which is fine). Does that seem reasonable? Plus the cost of having someone replicate the cornice. Victorian terrace, 5 bed student maisonette next door with the kitchen on the other side of this wall. Hear every conversation which isn't their fault, but gets stupid when they get loud. Will be a student let for the next 10 or so years.