Noise from neighbours is one of the principal causes of complaint about the indoor environment in dwellings. The noise is generated by airborne sound sources such as speech, or by impact sound sources such as footsteps on floors and stairs, banging doors and plumbing. This paper describes methods for reducing impact and structure-borne sound in buildings using both remedial treatments and design features; it replaces IP9/88. The advice will be mainly of use to architects, builders, and others concerned with designing new buildings or upgrading existing ones. 8 pages.