What is a SAP Calculation?

A SAP calculation works out the rating that is required in order to produce a Predicted Energy Assessment and an On-Construction Energy Performance Certificate for a new domestic building.

A SAP calculation indicates a score for the predicted annual energy cost for the new building based on:

  • The elements of structure;
  • The internal lighting;
  • The heating;
  • The hot water system;
  • Any renewable technologies installed in the home.

The higher the score the lower the running costs, with 100 representing zero energy cost.  Dwellings with a rating in excess of 100 are net exporters of energy.

The model used to produce a SAP calculation is largely location independent.  It is also based on a notional occupancy to overcome the different ways in which people use their homes.  As a result, SAP calculations allow the energy running costs of dwellings anywhere in the UK to be compared.

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