Supply Chain Advice Pack: BS 40104 Retrofit Assessment for Domestic Dwellings – Explainer
Introduction
British Standard* (BS) 40104 Assessment of Dwellings for Retrofit is due to be published on August 5th, 2025.
Published: July 2025
Contents
Welcome to the Supply Chain Advice Pack: BS 40104 Retrofit Assessment for Domestic Dwellings – Explainer
British Standard* (BS) 40104 Assessment of Dwellings for Retrofit will complement the existing PAS 2035, which governs the overall retrofit process. It will provide detailed guidance specifically for the assessment phase, to ensure that retrofit decisions are based on robust and comprehensive data. It is likely that the introduction of this standard, as well as the introduction of RdSAP10 from June 15th 2025, will add time and cost to the process as it will require additional thoroughness for assessors when carrying out and completing the work.
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