The social housing sector has been at the forefront of the adoption of different types of energy efficiency technologies and water-saving features as it has generally been building new homes to higher levels of the Code for Sustainable homes. The NHBC Foundation primary research report Sustainable technologies – the experience of Housing Associations identifies technologies that have worked well, those that have given rise to concerns and the nature of those concerns.

The research found that almost two thirds of housing associations surveyed said they had experience of at least one type of sustainable technology. Based on their experiences, the most popular option for use again in the future is PV (75 per cent), and between 50 and 60 per cent of housing associations say that they would expect to use MVHR (mechanical ventilation and heat recovery) and solar thermal hot water in the future.

Water-saving technologies have also been widely used with low-flush toilets and low-flow taps and showers becoming standard in new homes. Three quarters of housing associations expect to use these again in future. However, ground source heat pumps, exhaust air heat pumps, greywater recycling and rainwater harvesting delivered the lowest levels of satisfaction with at least one third saying they would seek to avoid these products.

With just one year to go before the UK government’s 2016 zero carbon home target, the report is aimed at helping the wider house-building industry make better-informed choices on sustainable technology. Other key findings are:

Two-thirds of housing associations said the main reason for choosing which specific technology to install was the up-front cost of installation; maintenance costs were also high on the priority list.

Over half consider ease of resident use as an import factor, but only 19 per cent considered the technology’s payback term to be a key influencing factor.

Inadequate installation was one of the biggest issues, with two thirds of housing associations experiencing problems due to a lack of skilled or experienced trades.

43 per cent of those surveyed said that benefitting tenants and reducing their fuel poverty was one of the biggest drivers for installing the technology.

81 per cent perceived that residents had benefitted from reduced energy bills, and almost a quarter cited better air quality.

The report found that there has been a relative lack of monitoring of performance of sustainable technologies and more research is needed to confirm good technology choices.  It also notes that ‘fabric-first’ approaches are becoming more widely established but they will not be sufficient on their own to meet zero carbon new homes targets and that energy efficient technologies will have to be used in addition.

Neil Smith, head of research and innovation at NHBC, said: “Much progress has been made by the house-building industry to address environmental issues, particularly in relation to improving energy and water efficiency.

“The social housing sector has led the way in the use of sustainable technologies.  Because of their ownership and management of significant portfolios of high-Code-level sustainable homes, housing associations have been in a position to gain experience of the installation, performance and resident satisfaction with the various technologies.

“This research is aimed at helping the wider house-building industry and others to make better-informed choices. This report identifies technologies that have worked well, those that have given rise to concerns and the nature of those concerns.”

Truong Duy