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  • 100 Liverpool Street shortlisted for Stirling Prize July 28, 2022

    We are delighted that 100 Liverpool Street, designed for British Land, has been shortlisted for the 2022 Stirling Prize

     

    The original office building, designed in the 80s with deep plan dealer floors for the “Big Bang” in the City of London, was dated and no longer suitable for contemporary working culture. The design options were either to demolish or to undertake a significant refurbishment. The latter option was chosen and has resulted in a what feels like a new building but actually retains a large proportion of the existing structure - 100% of foundations and 50% of superstructure.

     

    By carefully utilising the inherent redundancy in the original 1980’s concrete and steel structure we have managed to add three more floors making the existing building a lot more efficient. As a consequence of reusing the original structure, the embodied carbon is much lower than it would be for a new build option. The Embodied Carbon Assessment for stages A1-A5 was calculated at 389 kgCO2 per m2 which is significantly below current targets for new build office buildings.

     

    From the outside it may appear that the facade is almost entirely clear glazed, but in fact approximately 40% of it is opaque glazed with insulation behind it to help minimise both solar gain and heat loss. The facade was carefully designed to allow good views out, important in such a deep plan building, with decent light transmission internally whilst providing solar shading through the 300mm deep fins. The deep plan form of the building means that the façade area is relatively low for the accommodation provided. This ratio, known as the form factor, is a key driver of efficiency and therefore energy in use on every project, and on 100 Liverpool Street it is extremely efficient.

     

    The refurbishment also allowed the opportunity to upgrade the building systems to include heat recovery on the out-going air but also on the chillers with waste heat being used to heat the hot water in summer.

     

    Further information on British Land’s approach to embodied carbon can be found on their website:

    https://www.britishland.com/sustainability/environment/reducing-embodied-carbon