Sound proofing existing plasterboard

[JP_]

I live in a semi-detached house and my boys' rooms share a wall with my neighbours kids, and as everyone is getting older. things are getting noisier.

I am wondering if there is a way to improve the sound proof qualities of the walls without major work (i.e. not removing plasterboard etc.).

Are there materials that can be stuck / screwed on to a wall and then painted over? I don't mind losing 1-2cm of the room if it means years of improved peace.

Is this possible?

 

[foxhole]

You could overboard with sound proofing plasterboard.

 

[JP_]

Something like this?
http://www.wickes.co.uk/Knauf-Sound-Panel-Tapered-Edge-2400x1200x12-5mm/p/224657

 

[foxhole]

yes.

 

[JP_]

Has anybody ever tried this stuff: http://www.gowallpaper.co.uk/saarpor-sound-proof-insulating-liner.html

claims to be as effective as 10cm of concrete.