ECO4 scoring methodology

ECO4 scores are based on annual bill savings- this has changed from ECO3, which was based on lifetime bill savings.

The scoring system is designed to award full projects that meet the minimum requirements of a property.

Full projects scores are based on the annual energy bill saving produced by the improvement of the property's SAP rating.

The updated scoring methodology will be based on:

The difference in average annual bill expenditure between the starting SAP rating of the property (pre-retrofit) and the finishing SAP rating of that property (post-retrofit)

and the floor area of the property.

This is to be evidenced via a pre and post installation EPR, which must be in XML format.

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View Ofgem's general guidance here.

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