Join Woodknowledge Wales for a webinar to explore the pros and cons of SAP (EPC A) and Passivhaus in achieving net zero whole life carbon.

This webinar will explore the pros and cons of both the Standard Assessment Procedure (SAP/RdSAP) and Passivhaus as ways of delivering zero carbon homes.

A recent review of SAP (Making SAP and RdSAP 11 Fit for Net Zero) led by Thomas Lefevre of Etude Sustainability identified 3 limitations of its use:

  • The EPC rating is a measure of energy cost rather than energy efficiency or carbon and it can encourage rather than discourage the use of fossil fuels
  • The carbon emissions calculation required for regulatory compliance relies on short-term carbon factors which don’t reflect the whole life carbon impact
  • The key output for regulatory compliance isn’t a measure of performance and so prevents effective evaluation, tracking progress, benchmarking and fails to reflect more energy efficient design


10.00   Welcome: David Hedges, Woodknowledge Wales

10.10   SAP: What are its limitations in terms of net zero carbon: Thomas Lefevre, Director, Etude & co-author of ‘Making SAP and RdSAP 11 fit for Net Zero

10.30   Passivhaus as a fabric first alternative: Jonathan Hines, Chair Passivhaus Trust Scotland, MD Architype

10.50   A case study: An Ynys Mon housing project: Rob Thomas, Director, Hiraeth Architecture

11.10   Discussion

11.30   Close

Date and Time

Tuesday 23rd November 2021: 10.00 – 11.30


Click ‘REGISTER’ to book your place (via Eventbrite). Following registration, you will receive an email with joining instructions for the Zoom webinar a few days before the event. If you have any queries, please contact David at

Woodknowledge Wales members – FREE

Partner Organisations – FREE

Non-members – £20.00


Lead Sponsors

Event details

Date: 23/11/2021

Time: 10:00 am - 11:30 am