Supporting quality and consistency in domestic retrofits.
With 19 million UK homes needing energy efficiency improvements, retrofit is critical to achieving net zero. BS 40104:2025 provides a comprehensive, risk-based methodology for assessing dwellings before retrofit works are carried out—ensuring projects are based on sound, standardized practice.
This session, taking place during our Net Zero Week 2025, will introduce the key features of the new standard, explain its connection to PAS 2035 and explore how it supports safer, healthier, more energy-efficient homes.
What's on the agenda:
- An overview of BS 40104:2025 and what’s new.
- How it aligns with and expands on PAS 2035.
- The importance of detailed retrofit assessment.
- How the standard supports improved retrofit outcomes, health and sustainability.
- Key use cases for assessors, coordinators, manufacturers and specifiers.
Webinar details:
Date: Friday 26 September 2025
Time: 14:00 – 15:00pm (BST)
Location: Online
Agenda:
14:00 Welcome and introductions
- Colin McKerracher, Lead Standards Development Manager, BSI
14:05 The development of a new standard for retrofit assessment, BS 40104
- Richard Fitton, Professor of Building Performance, University of Salford, Chair of the BS 40104 Drafting Panel
14.15 Energy performance and occupancy
- Alan Pither, Director, Alan Pither Ltd
14.25 Retrofit assessment in the heritage sector
- John Edwards, Professor of Practice, University of Wales Trinity Saint David, and member of the CIOB Quality Implementation Group
14.35 The Application of BS 40104 – Managing Compliance
- Andrew Parkin, Director at Elmhurst Energy, Chair of the Property Energy Professionals Association
14.45 Panel Q&A
15.00 Close
The Speakers:
 Richard Fitton
Professor of Building Performance, University of Salford
Richard holds a PhD in Building Physics and is also a chartered building surveyor. He leads a task group for the development of international standards around energy performance. Richard is the Chair of the BS 40104 Drafting Panel. He is also active the International Energy Agency studying the use of smart meter data to provide energy efficiency data for dwellings.
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 Alan Pither
Director, Alan Pither Ltd
Alan has been working on energy and environmental assessment throughout the UK since the 1980s and, since 1998, as an independent consultant and trainer. His company, Alan Pither Ltd, is an Approved Centre for the ABBE energy assessor qualifications, and has provided a wide range of services to local authorities, housing associations and commercial organizations These services include energy assessor training and bespoke training courses, feasibility studies and business plans for energy efficiency projects, energy surveys and option appraisals, housing stock energy consultancy and the design of marketing materials to promote energy efficiency.
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 John Edwards
Professor of Practice, University of Wales Trinity Saint David
Professor John Edwards representing the CIOB on the BS 40104 drafting panel. A Chartered Construction Manager and Chartered Building Surveyor. Director and Head of Building Consultancy at Edwards Hart consultants, who specialise in older buildings including their retrofit – buildings range from social housing to nationally important landmark listed buildings. Also, a part time educator with the University of Wales Trinity St David as Professor of Practice and with the Environment Study Centre.
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 Andrew Parkin
Director at Elmhurst Energy, Chair of the Property Energy Professionals Association
Andrew is a director Elmhurst Energy and current Chair of the Property Energy Professionals Association (PEPA). He has extensive experience working across the industry to champion the work and value of energy assessment, EPCs and DECs. With a background as an energy assessor, he now works across government and with industry steering groups to drive the use of EPCs and DECs in government energy efficiency initiatives, policies and regulation. He also advises on improvements in technical documentation and standards.
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