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Press Release

Interserve's Passivhaus office is first of its kind in the UK

by Interserve Press Office | Nov 03, 2011

Passivhaus officeInterserve, the international support services and construction group, recognises the importance of sustainability in all of its clients' projects.

So when it came to constructing its own new regional office building at Leicester, the company was well placed to select building materials and methods that would optimise the build's eco-credentials and position it at the cutting edge of commercial property design. The result is a £1.5 million project, which is the first certified Passivhaus Carbon Neutral commercial office to be built in the UK.

The design principles of Passivhaus have already been broadly accepted and highly acclaimed in the UK house building industry, where they are helping developers to achieve superior energy efficiency ratings as part of the Code for Sustainable Homes. However, building to Passivhaus standards in the commercial sector is in its infancy, with Interserve at the forefront of implementing this construction method for a variety of public and private sector projects around the UK.

Located at Watermead Business Park near Leicester, the new building has been constructed by Interserve in partnership with park developer Raynsway Properties. The two-storey 6,000 sq ft office houses approximately 60 staff in a modern, fresh, working environment, running at a mere 10 per cent of the energy usage of such a building constructed conventionally. Super insulation, triple glazing and high levels of air tightness (<0.6 air changes per hour) have all reduced the requirements for space heating and cooling, thereby providing high-level comfort with very low energy consumption.

A superior air-tight construction avoids heat loss through the external envelope. Reinforced concrete walls have been built using Durisol 80% recycled wood blocks, which were delivered to site already insulated thermally and acoustically, with in- built fire protection.

With triple glazing and insulated foundations, the building is able to hold warmth during the winter and stay cool in summer, whilst the south-facing windows make the most of solar heat during the winter. Ventilated air passes into the building from an earth tube system, making the most of ground warmth in the winter and low ground temperatures in the summer. Efficient lighting has been installed to optimise daylight use by using automatic dimming controls.

At the time of writing, Interserve's staff are just settling into their new premises. Commenting on the project, Gordon Kew, Director of Regional Building for Interserve, said:
“New premises were needed to replace the company's increasingly outdated existing offices in the area, which were energy hungry and had become dispersed among various buildings.

"One of the company's core business values is improving our performance through continual learning and innovation. Sharing our knowledge and the design concept of our new building reflects these values through its simplicity, elegance and efficient energy use."

With the Leicester site demonstrating perfectly Interserve's capabilities in building to Passivhaus standards, the company is now undertaking a number of other Passivhaus projects around the country, including a circa £10 million primary school new build in Leeds, which is set to be one of the most energy efficient schools in the world when it is completed next year.

– Ends –

For further information please contact:

Michele Curran 
Head of Corporate Business Development

Karen Lewis 
Edson Evers
01785 255146

About Interserve

Interserve's vision is to be the Trusted Partner of all our stakeholders. We are one of the world’s foremost support services and construction companies, operating in the public and private sectors in the UK and internationally. We offer advice, design, construction, equipment and facilities management services for society's infrastructure. Interserve is based in the UK, has revenue of £1.9 billion and a workforce of nearly 50,000 people worldwide.

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