Shell only – Energy modelling requirements

For a shell only assessment, we would not expect to see improvements to equipment and services accounted for in the NCM calculation. It is, therefore, recommended that assessors submit a NCM document incorporating the fabric improvements, but which retains the equipment and services of the notional building.

Credits for shell only assessments are determined by the demand metric alone. The inclusion of more efficient equipment and services may, therefore, lead to lower heat gains, a subsequent increase in demand for space heating and, hence, a lower number of credits being awarded.