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Energy efficiency in homes

Questions to the Mayor of London – answered on 13th March 2020.

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Photo of Caroline Russell Caroline Russell Green

Research from the London Assembly Research Unit shows that at least £22 billion is needed just to bring our homes up to EPC level C. Is this figure in line with your own calculations and, if not, can you detail the research or analysis you have done to work out this cost?

Photo of Sadiq Khan Sadiq Khan Mayor of London

As part of the detailed modelling undertaken for our 1.5°C compatible plan, we estimated that the total capital cost of undertaking energy efficiency retrofits across all existing buildings to be approximately £10 billion (discounted) between now and 2050. Additional building level upgrades such as heat pumps & hybrid heat pumps are not included in this figure. They are detailed on page 26 of the plan.

The model assessed building energy performance against a series of  packages which would be required over and above business as usual, to retrofit the existing building stock in London to required emissions levels.

The detailed research and the Zero Carbon pathways tool, which details our assumptions can be found

Without seeing the research and assumptions behind the London Assembly Research Unit study it is difficult to take a view on the estimate.