24 October 2021

LETI releases Climate Emergency Retrofit Guide

London Energy Transformation Initiative (LETI) has released a Climate Emergency Retrofit Guide to show how homes can be retrofitted to make them fit for the future and support the UK’s Net Zero targets. The guide defines energy use targets for existing homes and provide practical guidance on how to achieve them.

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The guide is useful for architects, engineers, Local Authorities, social landlords, energy professionals, contractors and clients looking for guidance about best practice retrofit. 

‘It is widely accepted that retrofitting our existing buildings is absolutely critical if we are to achieve Net Zero,’ says LETI. ‘Around 18% of our annual national CO2e emissions come from existing homes - homes that will still be standing in 2050. 80% of 2050’s homes have already been built.  It is also widely acknowledged that the retrofit challenge is monumental. 

'Over one million homes every year for the next 30 years will need to be retrofitted. We cannot afford to retrofit them twice. But if we retrofit them well, we can enjoy many environmental, social and economic benefits.’


The guide sets out what good retrofit looks like for existing homes. The UK’s target energy consumption reductions of 60-80% for the average UK home. LETI says this is achievable through a whole house approach upgrading the building fabric, incorporating energy efficiency measures, improving ventilation and fitting heat pumps.

These targets in the guide have been determined through practical experience and understanding of what measures are realistically achievable. They are also informed by a national housing stock model to examine issues such as renewable energy provision and grid capacity. The guide also points out the potential risks of poor retrofit and advises on how to deliver efficient, resilient, and healthy homes.