Passivhaus Affiliate

Passivhaus Retrofit Masterclass lecture series

Date: 15 December 2021 - 27 April 2022 Time: 13:00 - 14:30, run monthly
Location: Online Cost: PHT member: £80+VAT, Non-member: £120+VAT

Passivhaus Retrofit Masterclass lecture series


Full series summary      I     Next in the series     I      Cost 


27% of our annual carbon emissions are attributed to the energy needed to run the UK’s buildings, with 18% alone coming from our domestic housing stock. 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.

Expanding upon our retrofit activities and following an engaging introduction to the Passivhaus Retrofit Masterclass lecture series, we commence the full series this winter, taking an in-depth dive into achieving Passivhaus in several retrofit constructions. Learn first-hand from expert practitioners and enrich your practical and technical knowledge about how Passivhaus can apply to your future retrofit projects. 

The Masterclass lecture series is aimed at built environment professionals interested in designing and delivering Passivhaus retrofit projects, including: architects, engineers, consultants, contractors, and self-builders. It is estimated that each Masterclass lecture will be worth 2 PHI renewal credit points.

Join us online for five 90-minute afternoon webinars. Running one session every month, the series addresses multiple constructions from solid wall to cavity construction, covering both residential & non-domestic challenges. View the full series here.

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Next in series: Solid Wall Construction

Next in series: Solid Wall Construction retrofit

Topics explored in this 90-minute session focusing on solid wall construction include:

  • Introduction retrofit overview
  • Fabric/materials
  • Services
  • Airtightness strategy
  • Comfort and overheating strategy
  • Costs and benefits


Passivhaus Retrofit Masterclass: Sarah Lewis, Passivhaus Trust
Passivhaus Retrofit Masterclass: Bill Butcher, Green Building Store Passivhaus Retrofit Masterclass: Marion Baeli, PDP London

Sarah Lewis

Passivhaus Trust

Bill Butcher

Green Building Store

Marion Baeli

PDP London



Welcome by Chair 


Presentation 1 




Presentation 2 




Final Panel

NB - detailed programme coming soon


Summary of full lecture series


Masterclass lecture

15 December 2021

Solid wall construction retrofit

26 January 2022 (date TBC)

1930s cavity construction retrofit

23 February 2022 (date TBC)

1980s step by step construction retrofit

30 March 2022 (date TBC)

Multi-Residential retrofit

27 April 2022 (date TBC)

Non-Domestic retrofit

NB: Programme subject to change



  • Series of five afternoon webinars - running one every month.
  • Webinars will be delivered live & online via zoom.
  • The duration of each Masterclass lecture is 1.5 hours, with a concluding Q&A.
  • Recordings of each session will be made available to all delegates and valid for 12 months.
  • Bookings for individual sessions are available.
  • It is estimated that each Masterclass lecture will be worth 2 PHI renewal credit points.





 Full Masterclass lecture series  

Individual Masterclass lecture  

PHT member








Book now via the online registration form. Bookings for individual masterclass lectures are available.

Book Now



Further Information

Passivhaus Retrofit Campaign

Is Passivhaus Retrofit right for you?

Passivhaus: the route to zero carbon?

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