I can hear the neighbours next door. The walls are already plasterboarded so i would prefer not to pull it all down is there any way of injecting somethin in to do the same job???
Please see our projects on soundproofing and contact the company featured in there, CAD soundproofing. We have worked with them for some time now and always find them to be very helpful and knowledgeable: https://www.diydoctor.org.uk/projects/so ... e_home.htm