The London Energy Transformation Initiative (LETI) is a network of over 1000 built environment professionals that are working together to put London on the path to a zero carbon future. The voluntary group is made up of developers, engineers, housing associations, architects, planners, academics, sustainability professionals, contractors and facilities managers.

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10.02.21  LETI launches 'Hydrogen: A decarbonisation route for heat in buildings?' paper

Hydrogen as a means to deliver energy is often touted as a viable solution to assist in meeting the UK’s net zero carbon target. This has a major influence on the need, or otherwise, to enhance new-build energy efficiency and the energy retrofit of our existing stock. Why enhance our buildings if the current use of natural gas can be simply switched to zero-carbon hydrogen? In this short discussion paper, LETI have sought to investigate this further, examining to what extent hydrogen is likely to be used.

→  Download the Hydrogen Paper here

27.01.21  LETI celebrates 1 year anniversary of CEDG & ECP publication

Today marks the 1 year Anniversary of the Climate Emergency Design Guide and Embodied Carbon Primer publication! It has been a very successful and positive year, and it would not have been possible without the amazing volunteers at LETI. Their knowledge, dedication and teamwork has been invaluable, proving that working together on neutral ground can create an incredible force for good.

→  Read the full article here

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06.05.20  LETI 2020 Workstreams

Following on from a busy 2019, this year LETI is looking to continue and develop the work presented in our Climate Emergency Design Guide. In addition, we are hoping to focus on new areas and our 2020 workstreams will address a range of topics.

→  Read more about the 2020 Workstreams here

27.01.20  Climate Emergency Design Guide

We've launched our Climate Emergency Design Guide, which sets out the approach, targets and benchmarks that developments in the UK need to achieve to reach Net Zero in operation. This means that the developers, consultants and policy officers in the UK will have a reference point to define what their developments should achieve to ensure our climate change targets are met.

This is required, as LETI believes that by 2030 100% of all new buildings will need to operate at Net Zero, which means that by 2025 100% of all buildings must be designed to Net Zero. This will give 5 years to sense check, refine and validate this approach.​

Supplementary guidance to the guide is provided in our Embodied Carbon Primer.

→  Read the Climate Emergency Design Guide here

→  Read the Embodied Carbon Primer here

16.12.19  Net Zero Operational Carbon - One Pager

2019 has been a watershed year. The climate emergency is now acknowledged and there is widespread support for an acceleration of the transition to Net Zero Carbon.


Industry consensus has been established on the key features of Net Zero Operational Carbon buildings. This new 1-page summary was launched by the London Energy Transformation Initiative (LETI) on 16.12.19 at Feilden Clegg Bradley Studios. This document was developed in collaboration with UKGBC and Better Buildings Partnership.

→  Read more here

Get involved in LETI

There are many opportunities to support LETI, including volunteering your time and expertise. Subscribing to our mailing list is the best way to keep up to date with what we are doing:

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