NET ZERO READY HOMES: DELIVERING THE FUTURE HOMES STANDARD ROUND TABLE REVIEW 33


existing Part L 2021. He said: “Several key industry bodies, including UKGBC and LETI, have raised concerns about the failure to improve fabric standards from 2021. Does raising fabric standards need to be a priority as we switch to low carbon heating?”


Danielle Michalska-Morris from Barratt Redrow said that while the housebuilder was primarily fabric fi rst, there was “an element of diminishing


returns,” giving the example of Scotland where they were required to achieve 0.17 U-values for external walls using timber frame. “It becomes much more tricky – you start increasing wall width and potentially timber stud sizes, which also has a knock on effect on embodied carbon, but a negligible impact on the running cost to the customer.”


Jamie Bursnell said that Bellway


were “following [the notional building] reference values” for their fabric designs, in line with Part L 2021, and “are not going to reduce the insulation thickness, or tae anything out of the fl oor He asserted the reference value-based approach was “the only surety” that they would be able to comply with the Fabric nergy ffi ciency tandard  which sits within the Future Homes Standard. However, he said that the “knock on issues” would arise if there were further changes made to the standard, such as on U-values, and the balance was diffi cult e have invested a lot of time coming up with a footprint and a wall thickness that will suit both masonry construction and timber frame; we have a scope 3 embodied carbon target, we know we have to increase our timber frame e also now that we want the same plotted footprint, so that U-value in the notional dwelling has become business critical.”


Bursnell added that with a goal to achieve 30% timber frame in new homes, Bellway was investing millions in its own timber frame factory, and asserted that the company had been “plotting wide footprints for the last three years, so that when we transition


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