The energy model for the existing building in a change of use project should include the physical characteristics of the existing building but with the use class of the proposed refurbished building to enable a comparison to be made between the performances of the two buildings.
Moreover, the existing building energy model needs to include the existing services as they were before the refurbishment. Where a particular system to be installed in the refurbished building is not present in the existing building, then the baseline system needs to meet the minimum requirements required to pass building regulations for it.
22/02/2017 Added content clarifying building services
