Passivhaus Affiliate

Coming up from the Passivhaus Trust

Several research projects have been simmering away at the Trust and will be  launched in 2021. An analysis to help steer nationwide retrofit efforts to have the maximum impact, an indispensable tool for the PHPP to anticipate and avoid overheating risk, and the second half of our Passivhaus Costs and Benefits guide, are all in the works and will be out soon.



With the publication of the 6th Carbon Budget, the routes for getting to net zero are becoming a bit clearer (though not easier!). We already knew it, but retrofit is going to be a key part of the strategy. However, there still remains a lack of clarity in this area. How far should we be going? Should we have some clear kWh targets as we do for EnerPHit? Should there be different targets for different types of building? What about all our heritage buildings?  The Passivhaus Trust is continuing to work with LETI to answer some of these questions and, so far, there are some interesting findings.  For example, below is a mapping of all our domestic stock showing where we might want to focus our efforts – who knew that we had so many semis!  The intention is to jointly publish some detailed retrofit guidance early in 2021, and Passivhaus Trust members will be invited to a sneak preview at the end of January.


Housing stock by volume sankey diagram | Passivhaus Trust 2020



Overheating continues to be a worry as we watch our climate gradually warm.  The Trust trailed some more detailed guidance and a plug-in PHPP overheating tool at our November conference.  Since then, we’ve linked up with the PHI to make sure it fits with what they are doing with PHPP10 (fortunately it does!) and will launch the tool as a beta version early in 2021.


Overheating risk key indicators | Passivhaus Trust 2020


Passivhaus benefits

Finally, we’re continuing to work on our Passivhaus Benefits guide, as a follow-up to our costs guide. Again, there was a short taster at the conference from Kate de Selincourt which showed just how much positive information is available.  Once we have worked out how to narrow it all down and present it in a succinct but informative publication, we’re hoping this guide will be on the streets in Q1 2021.


Further information

Passivhaus Retrofit

Summer overheating - UK Passivhaus Conference 2020 presentation - John Palmer [PDF]

Passivhaus Construction Costs


10th December 2020

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