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Sustainable Project of the Year: Winner

Winner: Skanska Rashleigh Weatherfoil – Bentley Works Redevelopment

Sustainability has become an ever-greater priority for contractors, with low-carbon processes now an integral feature within many companies.

But when Skanska needed to redevelop the Doncaster home of Cementation Skanska, Bentley Works, it put sustainability at the centre of the project – with M&E specialist Skanska Rashleigh Weatherfoil playing a major delivery role.

The project saw the team undertake the demolition of an old office and workshop, build new facilities to replace them, and upgrade one of the existing workshops.

It was Skanska’s first UK project to be rated as ‘Deep Green’ according to the company’s internal colour palette rating system, meaning it had to achieve a series of stringent objectives. On Bentley Works, the team achieved net zero primary energy, zero waste, zero hazardous materials and net zero water.

SRW installed an evaporative cooling system in the workshop to help achieve this, which sees roof fans blow air onto moist pads and uses 70 per cent less energy than conventional mechanical cooling systems. LED lighting was also employed throughout, using 20 per cent less energy than traditional lighting.

“The commitment to both measure in-life use and consumption, and openly publish the project case study to share the lessons, reinforces SRW’s commitment to a wider sustainable agenda”

Judges’ comment

The site is equipped with solar photovoltaic panels and two biomass boilers to generate energy on site. The 156 kW boilers utilise a district heat system and are fuelled by biodegradable waste oils, as well as locally sourced wood pellets.

Waste oils from the workshop provide around 25 per cent of the site’s heating. Cementation Skanska previously had to pay to get rid of this waste oil, meaning the new system offers a commercial benefit to the tenant as well as an environmental one.

Innovation came through the ongoing trial of a sample of cardboard ducting, used in a dirty plant environment to get a true sense of the product’s suitability and durability.

The team has also improved the site’s water efficiency. Previously, a lot of water was used for washing rigs and other plant cleaning requirements, and the site used to flood following poor weather.

SRW installed an attenuation system to capture and reuse stormwater on the site, which, coupled with a rainwater harvesting system, has meant Bentley Works uses 70 per cent less water than the industry benchmark set out by BREEAM.

The office building uses 67 per cent less energy than the minimum requirements within Building Regulations, and the project has a total economic payback period of 11 years.

Our judges described the redevelopment of Bentley Works as the “clear winner” of this year’s award: “The commitment to both measure in-life use and consumption, and openly publish the project case study to share the lessons, reinforces SRW’s commitment to a wider sustainable agenda.”


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