NET ZERO READY HOMES: DELIVERING THE FUTURE HOMES STANDARD ROUND TABLE REVIEW 29


benefi t from clearer information and guidance to accurately model what is achievable with our homes he continued, saying that lac of clarity meant that they would need fl eibility to how we meet compliance once the  model is available, it could restrict how we meet compliance, potentially having a noc on effect on our supply chain ichalsa-orris said that as a developer actively investing in land to support the overnments pledge to deliver million homes, arratt edrow was fully committed to playing our part That said, greater clarity on forthcoming regulations would provide the confi dence needed to move forward with certainty and pace


amie ursnell of ellway omes said that from looing at the oldilocs one, balancing ease of install, cape, deliverability, scalability and giving the best result for the customer, our view is that there will never be a ellway house constructed to the  without solar  owever, he said that the issue which the company epressed in its consultation response was the amount of  and how it is applied in the notional dwelling e eplained this was why ellway couldnt support ption  as it stood in the consultation


n terms of the liely timeline of the tandard, ursnell said that, with the regulation not having been laid in place in December , the ship has sailed on the possibility of it coming into force in  This was due to it being predicated on a si or  month lead-in and a  month transition, and it would also be due to parliamentary process


HOME ENERGY MODEL TRUTHS The ey to the standards implementation is eagerly awaited  the ome nergy odel  which replaces  and which will be used via a notional building to establish whether new schemes comply t was epected the ome nergy odel would be released within days of the round table, but at the time of writing theres still no sign of it,


“WE SHOULD BE LOOKING AT HOW TECHNOLOGIES WORK TOGETHER, NOT USING HEM AS A TOOL THAT PITS THEM AGAINST EACH OTHER”


IAN STEWARD, MIRA SHOWERS


although it was confi rmed in early une that software providers ustenic and uidos would be developing the core software engine


amie ursnell said that introducing the standard without a fully functioning  tool is going to be really, really diffi cult for a developer e said that despite ellways substantial resources and large supply chain, e need the tool and it needs to be bug free ursnell eplained that when   emerged in une  which  is to replace, we were tearing our hair out because it was riddled with bugs and had limited functionality


e said that, with potential further consultation time spent around the  reuirements in the ption  model before the summer arliamentary recess, it was feasible that the regulation would be laid in December , coming into force in December , and then a transition arrangement leading until December 


ursnell concluded that developers are going to need a fully functioning  tool ahead of the regulation coming into force, to stress test designs onathan Ducer from ingspan nsulated concurred, saying it was ridiculous we dont get a fully woring  tool before we actually publish what we are intending to do  its important to everyone across the supply chain e continued, ay,  is not a design tool, but it informs the design specifi cations that are needed to comply Ducer said that the notional building approach which  rests on for establishing buildings energy performance at design stage was all well and good, but that its fi tness for real-world buildings would only be proven once in use ts only when you start to use it that you fi nd out that a notional building by itself doesnt pass e was more confi dent than ursnell on the current  timescale, saying that the overnment was committed to publishing this year, and that in previous regulation updates, it had taen si months to implement e said there is a possibility we will get publication in eptember, and you could have implementation from arch  e admitted that there hadnt been a massive change between reuirements in terms of energy effi ciency from the  to  regulation updates, and including the consulted values for the   Danielle ichalsa-orris however pinpointed the challenge for developers of no longer being able to achieve compliance on a whole-site basis, due to transitional arrangements for  being plot-specifi c, meaning we have sites operating with two sets


of regulations he also pushed bac against the idea that the  would not be drastically different, saying it is much more comple, reuiring many more inputs such pipe wor details which are not reuired in , and admitted that providing the more comple information will defi nitely be a shift Tassos ougionis said that there was a perfect storm currently resulting from the absence of the  model, combined with a  million homes target by   was not perfect, and without understanding what the assumptions are, there will defi nitely be bugs with , he said


IN HOT WATER


nother supplier perspective on  came from Craig Dolan of len Dimple, who said its important we understand , because we have to understand where our products fi t, or maybe dont fi t and where we need to mae changes to them e echoed on Ducer, saying that the  tool needed to be released because we need to be able to put products in to see how they will react  we thin we now Dolan summed up the ey change, that in future, while the heating reuirement of new homes is really, really low the hot water reuirement is arguably going up e added The relative increase in importance of hot water use meant the effi ciency around hot water storage or hot water generation is going to be really, really important an teward of ecoup nergy olutions, on behalf of ira howers, gave a view echoed by others in the appliances sector, that some of the assumptions on domestic hot water use are drastically off compared to where  was e eplained further  t suggests everybody showers two and a half times a wee rather than four and a half times a wee there are so many things around  that are being uestioned e accepted that in the contet it may be a case of whoever shouts loudest gets their assumptions looed at fi rst onathan Ducer added that we havent had a woring version of the consultation for fi ve, si months The previous version that was out there was evidently so far from where they were that they pulled it entirely, and there just hasnt been anything to even trial Craig Dolan of len Dimpe mentioned other new regulatory challenges affecting specifi cation, such as mart ecure nergy ystems , which oversees how low carbon smart appliances wor with the grid, and how that might impact running costs nd, striing the balance between lower temperatures and legionella control was a further


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