Passivhaus Affiliate

Retrofit: The 'EnerPHit' in the room

Hot off the press - read the new cross-industry retrofit guidance and discover how to level up your knowledge to address the EnerPHit in the room!

With one of the oldest housing stocks in Europe and many new homes being inadequately built, the UK is currently facing the immense challenge of retrofitting over 28 million buildings by 2050. Learn more about why we cannot rely on renewables alone and the importance of an energy-efficient-first approach to decarbonising the grid in our presentations on Passivhaus: a route to zero carbon. The urgency to upgrade existing UK homes is critical to meeting net-zero targets by 2050. The Passivhaus Trust has supported the development of the NEW cross-industry retrofit guidance, published by LETI, which shows how this is possible.

Retrofit Guide Front Cover LETI Climate Emergency Retrofit Guide: Quick Start Guide

Free PDF Download

Quick start guide


The guide & quick start 2-page summary, published by LETI, guides what good retrofit looks like and suggests typical house archetype examples for four primary housing types: semi-detached, detached, mid-terrace and a flat. A summary for policy makers can be found here.


Our existing buildings are by far the biggest culprit of carbon emissions from the built environment – and therefore also pose the biggest potential for carbon savings. We must seize the opportunity to address the Climate Crisis AND radically improve the health and wellbeing of millions of households. We hope this timely guidance, along with several additional new PHT design tools, will drive urgent deep retrofit into action at scale. The Trust welcome detailed analysis that sets EnerPHit into context as the exemplar retrofit standard. LETI is a shining example of what cross-industry collaboration can achieve – we look forward to much more of this!

Sarah Lewis, Research & Policy Director,  Passivhaus Trust 


Passivhaus Retrofit Resources

For the latest Passivhaus retrofit resources, including the PHT retrofit position paper & periodic heating tool, please check the Passivhaus Retrofit Campaign page.

Passivhaus Retrofit Position Paper Modelling existing dwellings in PHPP Periodic Heating
EuroPHit: Step by step retrofits

The Trust launched the  Passivhaus Retrofit Masterclass lecture series earlier in September, which will delve into the details for various construction methods. Level-up your retrofit knowledge in this timely series and address the EnerPHit in the room.

Passivhaus Retrofit Masterclass series


Bookings are now open for the full lecture series, diving into EnerPHit best-practice for various construction methods, including solid wall, 1930's cavity-wall, step-by-step construction, multi-residential and non-domestic retrofit. Spaces are limited. Early booking is advised as we anticipate large appetites for the upcoming Masterclass events commencing this Winter.


Book Now



Dates for your diary

  • Wednesday 15 December 2021: Solid wall construction retrofit

  • Wednesday 26 January 2022: 1930s cavity construction retrofit

  • Wednesday 23 February 2022: 1980s step by step construction retrofit

  • Wednesday 30 March 2022: Multi-Residential retrofit

  • Wednesday 27 April 2022: Non-Domestic retrofit

For further information including programme details & speakers please check here. 


Further Information

Climate Emergency Retrofit Guide

Passivhaus Retrofit Masterclass 2021/ 2022

Passivhaus Retrofit Campaign

Is Passivhaus Retrofit right for you?

Passivhaus: the route to zero carbon? 

CLC: Greening our exisitng homes. National retrofit strategy

Bloomberg: Retrofitting Buildings Is the Unsexy Climate Fix the World Needs - 20 October 2021

22nd October 2021

Never miss UK Passivhaus news by joining the Passivhaus Trust mailing list Follow us on twitter @PassivhausTrust

< Back To News