When new dwelling has a party wall or floor with an adjoining dwelling. These building elements must comply with sound transfer requirements. For the builder or developer there are two options:
Sound insulation testing, or pre-completion testing may be carried out on new a new dwelling or a renovation of a previous building into a dwelling. A party wall will require an airborne test and party floors/ceiling must be tested for both Airborne and Impact sound transfer.
Sound insulation testing must comply with Building Regulations Approved Document E as per the link below.