The simple solution is to mount another door, at least four inches away from the existing door, eight inches is best.
Make sure both doors fit properly, as noise will move through any gaps.
Almost any second hand door will do.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!