Part E Acoustic Performance Standards

New-build separating walls between dwellings must achieve a minimum airborne sound insulation of DnT,w + Ctr >= 45 dB when pre-completion tested. For conversions (material change of use), the target is DnT,w + Ctr >= 43 dB. These values are set out in Table 0.1 of Approved Document E (2003 edition incorporating 2015 amendments).

DnT,w is the weighted standardised level difference measuring airborne sound insulation. The Ctr spectrum adaptation term adjusts for low-frequency sounds (bass, traffic noise). DnT,w + Ctr gives a more realistic single-number rating. Part E specifies DnT,w + Ctr as the performance standard because it better represents real-world complaints like bass music and traffic.

Pre-completion testing (PCT) is required for all new-build dwellings with separating walls or floors, unless the builder uses Robust Details (www.robustdetails.com) which are pre-approved constructions that have been demonstrated to meet Part E without on-site testing. PCT must be carried out by a member of a UKAS-accredited body or registered scheme.

Part E Section 0 deals only with separating elements between dwellings and between dwellings and common areas. Internal walls and floors within a single dwelling have no statutory acoustic requirement under Part E, though good practice is to use similar specifications particularly between bedrooms and noisy rooms.

Scotland has its own acoustic requirements under Technical Handbook Section 5 (Noise), with similar but not identical performance standards. Northern Ireland uses Technical Booklet G which broadly aligns with AD-E. Requirements may vary slightly — always check the relevant jurisdiction's documents.