Designed or altered to be used separately

A part of a building designed or altered to be used separately is where the accommodation is suitable for separate occupation. This could be indicated by the accommodation having its own access, separate provision of heating and ventilation or shared heating and ventilation but with separate energy metering and the ability by the occupier to independently control those services. The part could be deemed to be separate even if some facilities (ie kitchen and toilet facilities) were shared.

Communities and Local Government Display Energy Certificate Guidance Document