LETI (Low Energy Transformation Initiative) is a voluntary network of over 1,000 built environment professionals, working together to put the UK and the planet on the path to a zero carbon future. Their vision is to understand and clarify what this means in the built environment and develop the actions needed to meet the UK climate change targets.

LETI volunteers are made up of sustainability professionals, developers, engineers, housing associations, architects, planners, academics, contractors and facilities managers, with support and input provided by local authorities and other organisations.

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LETI have supported the development of consensus-driven understanding on Net Zero carbon, collaborating with many others in this space – find out more in the LETI CIBSE Net Zero FAQs:

This work is being taken further through the vehicle of the of UK Net Zero Carbon Buildings Standard, a joint initiative with BBP, BRE, the Carbon Trust, CIBSE, IStructE, LETI, RIBA, RICS, and UKGBC. This Standard will enable industry to robustly prove their built assets are net zero carbon and in line with our nation’s climate targets.

In 2020 LETI published the Climate Emergency Design Guide, which outlined requirements for new buildings to ensure our climate change targets are met. The Climate Emergency Design Guide has been widely supported, adopted and cited by architects, developers, law makers and built environment professionals. It has been downloaded over 60,000 times in over 100 countries and its requirements are accepted and followed by building professionals across the UK. LETI is aware of over 30,000 homes and 1,000,000m2 of commercial floor space that are aiming to meet LETI’s new build targets.

Supplementary guidance on Embodied Carbon was also provided in the Embodied Carbon Primer and LETI have developed a set of embodied carbon targets, definitions, scopes and  measurement methodologies along with RIBA, WLCN and IstructE. 

LETI have also published comprehensive guidance on Retrofit: the Climate Emergency Retrofit Guide. This guide shows how we can retrofit our homes to make them fit for the future and support the UK’s Net Zero targets – it defines energy use targets for existing homes and provides practical guidance on how to achieve them.  Further publications include guidance on the circular economyhydrogen and a Client Guide for Net Zero Carbon Buildings as well as a variety of opinion pieces.