BSI: BS 40104: The New Standard for Retrofit Assessment

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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