Separating Wall

Separating walls divide one dwelling from another, so they need to meet the sound insulation requirements of Approved Document E and the fire requirements of Approved Document B. These details come from our material change of use set. They show separating wall treatments and the junctions between separating floors and separating walls, for projects converting existing buildings into houses and flats.

When do the separating wall requirements apply? When dwellings are created by a material change of use, Approved Document E requires sound insulation between them, and Approved Document B sets the fire requirements. Building control will confirm what applies to your project.

Is there guidance on material change of use? Yes. See our article Understanding Material Change of Use – BR Part B & Part E.