15
BUILDING PROJECTS
1 TRITON SQUARE LONDON
Renewed sense of purpose
Arup believes that its redevelopment of the workplace it designed in the 1990s in West London, including a refurbished facade, will save 40,000 tonnes of carbon compared with a new build approach. ADF’s Tom Boddy reports
sits 1 Triton Square – a trading building originally constructed for the First National Bank of Chicago in the 1990s by British Land and designed by Arup Associates. More than 20 years after completion, the project is now being redeveloped, with the original Arup team taking on the challenge to reuse as much of the structure as possible, and enhance it for carbon gains. The original concrete structure was six storeys high including plant, with four corner cores clad in French limestone. A unique aspect of the development was that it featured what at the time was considered a “pioneering” double-skinned facade, says Matteo Lazzarotto, senior facade engineer at Arup, with an outer layer of monolithic glass and an inner layer composed of double glazed units. “It was one of the earliest building examples using this technology,” he tells ADF. In 2015, because of the “evolving needs of the customers,” British Land decided it was time to re-evaluate the existing structure and transform it to meet the demands of “today’s workstyles,” says Lazzarotto. The main drivers included increasing the office floorspace by 125,000 ft2
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, reconfigure the layout to provide modern, flexible and affordable workspace, and create an “exemplary” sustainable as well as healthy place to work. Acknowledging the complexity of the redevelopment, British Land commissioned Arup to deliver all architecture, engineering and specialist design services, as well as involving most of the companies that worked on the original design.
ADF NOVEMBER 2021
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ituated on London’s Euston Road between the British Library, University College London, and Regent’s Park,
Reuniting the original team and having companies that had worked on the building initially was a “fundamental prerequisite” for a successful redesign, explains Lazzarotto. The team had access to all of the original records and as-built drawings which “really helped during the early stages when key decisions had to be made.” Additional intrusive surveys could be avoided as they already knew the original function and performance of the elements.
Circular economy
“Everything was already set up for an office building,” explains Lazzarotto; the existing building had “very good bones; a very good framing structure with high loading capacity and good floor to floor heights, as well as good ventilation infrastructure and voids.” On account of this, the team of Arup, British Land and main contractor
Triton Square is one of the UK’s first large-scale projects where the circular economy approach has been applied to the facade
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