‘T
he key to the success of this project was to involve the design team to develop the building to reduce energy consumption in
conjunction with the building services solution,’ says Danny Hall, associate director at consulting engineers Norman Disney & Young (NDY). Hall is talking about the £70m reinvention of the Angel Building – a transformation from an ugly, inefficient 1980s commercial property into a swanky, modern office that is also a showcase for sustainable refurbishment. The scheme’s recent triumph at the CIBSE
Building Performance Awards 2012 – where it was the Refurbishment Project of the Year – and its shortlisting for architecture’s 2011 Stirling Prize, are a testament to the success of this transformation. Situated on a busy crossroads in Islington,
north London, the revamped building has a sleek, curved slate-coloured façade. Inside the building, the street’s hubbub gives way to a cool, restrained interior centred on an
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impressive atrium that affords glimpses of five floors of modern offices. Fundamental to the building’s reincarnation has been the retention of its concrete structure. NDY has been involved in the makeover from the outset, both as environmental engineers and sustainability consultants. It was the firm’s analysis – demonstrating how much carbon could be saved by retaining the structure – that convinced the design team this was an option worth pursuing. ‘It saved about 7,400 tonnes of CO2, so it made a lot of sense to keep the structure,’ says Hall. To tease every inch of extra space out of
the site, the architect discarded the original cladding and sympathetically extended the structure to maximise the floor areas. At the front of the building this extension takes the form of a curved, steel-framed addition that follows the bend of one of merging roads, St John Street. A smaller, rectilinear extension has also been added to the southern elevation, while a new fifth floor has been added to the
As part of the renovation, a new fifth floor has been added to the roof, along with two spacious roof terraces giving views over north London
The CIBSE Building Performance Awards recognise, reward and celebrate the best performance, innovation and practice in design, commissioning, construction, installation and operation of sustainable buildings and the manufacturers whose technologies enable energy efficiency. For further information on this year’s winners, as well as details of how to enter the 2013 awards, please visit
www.cibseawards.org
May 2012 CIBSE Journal 25
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