Written question asked by Lord Truscott (Non-affiliated) on Tuesday, 11 March 2025, in the House of Lords. It was due for an answer on Tuesday, 25 March 2025. It was answered by Baroness Taylor of Stevenage (Labour) on Wednesday, 19 March 2025 on behalf of the Ministry of Housing, Communities and Local Government.

Energy Performance Certificates

Question: To ask His Majesty's Government whether secondary glazing and infrared heaters are included in energy performance certificate (EPC) assessments; and if not (1) why, and (2) what consideration they have given to including secondary glazing and infrared heaters in EPC assessments in future.

Answer: The Energy Performance of existing homes is assessed through the model known as the RdSAP, which enables EPC assessors to record instances of secondary glazing so this can contribute towards a higher EPC score for the dwelling. Infrared heaters are currently treated as a standard direct electric heater under this methodology. Although infrared heating is not modelled as its own category, the Government acknowledges its potential to offer efficiency benefits over other direct electric heating appliances. The ‘Appendix Q’ process enables the recognition of additional technologies such as infrared heating and manufacturers or industry groups can pursue that route for recognition in RdSAP subject to the completion of appropriate testing.

Secondary information