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Housebuilders have hit out at the government after software failures meant firms couldn鈥檛 properly respond to a consultation on the Future Homes Standard, forcing the officials to issue an emergency fix and prompting a last-minute delay.

The Department for Levelling Up, Housing and Communities (DLUHC) this week said that consultations on the Future Homes and 好色先生TVs Standards and new Home Energy Model (HEM) designed to underpin it had been extended from the original closing date of 6 March to 27 March.

In a 鈥溾�� published by the department, it said the delay was because it was 鈥渁ware of certain aspects of these consultations which are causing confusion or concern鈥�. A separate explanation, contained in the makes clear the delay is due to 鈥渁n issue with the consultation version Home Energy Model software that informs responses to the Future Homes and 好色先生TVs Standards consultation鈥�.

The Future Homes Standard (FHS) is being brought in to ensure all new build homes are 鈥渮ero carbon ready鈥� from 2025.

HEM is new software which has been designed to replace the longstanding SAP software used to calculate the designed energy performance of a building based on a range of assumptions 鈥� and is to be used to calculate a building鈥檚 performance against the FHS.

It is understood the problem with the version of HEM consulted on, which related to how heat pumps were accounted for in the software, meant it was impossible to demonstrate compliance with the FHS using buildable specifications from a range of house types 鈥� including homes with Solar PV on the roof and a heat pump but where the PV panels weren鈥檛 south-facing.

The explanation on the consultation page says: 鈥淲e have recently been made aware of an issue with the consultation version Home Energy Model software, which was affecting the modelled solar PV yield if solar panels were not facing south.鈥� While the explanation says the department has issued a fix for the problem, housebuilders are understood to be concerned that the problems with the software are more wide-ranging.

A more detailed explanation of the issues facing housebuilders responding to the consultation, provided by the , makes clear that the software model appears to be frequently requiring 鈥渟ignificantly more area of PV鈥�, leaving them with insufficient roof space to accommodate it, and that the heat pumps included in the model did not have the ability to modulate their output.

The department is now calling for respondents to its consultations to resubmit their responses, where necessary, by the new deadline.

One industry source said there was now concern that the longer term fix to the HEM software model could take anything up to two years, giving the potential to delay implementation of the Future Homes Standard.

Steve Turner, executive director at the Home Builders Federation, said the industry remained committed to implementing the Future Homes Standard but added the government had to play its part by providing 鈥渢he necessary guidance and modelling tools鈥�.

He said: 鈥淭he new standards require fundamental changes to how we deliver new homes and the industry urgently needs certainty to be able to plan ahead. The confusion and difficulties being experienced with the new Home Energy Model are frustrating and we hope that the extension to the consultation has allowed government to make the necessary changes and prevent any further delays.鈥�