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1.1 A new building must be built to a minimum standard of total energy performance. This is evaluated by comparing calculations of the performance of the ‘actual building’ against calculations of the performance of a theoretical building, called the ‘notional building’. This must be carried out both at the design stage and when work is complete.

The notional building is the same size and shape as the actual building and has standardised properties for fabric and services. The full properties of the notional building are set out in the National Calculation Methodology Modelling Guide, which is available from https://www.uk-ncm. org.uk/.

1.2 The energy performance of the notional building is described using the following metrics.

a. The target primary energy rate, in kWhPE/m2 per year.

b. The target emission rate, in kgCO2/m2 per year.

1.3 The targ

Section 1: Calculating the target primary energy rate and target emission rate