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184 SHEPHERD’S BUSH ROAD, HAMMERSMITH, LONDON


“We wanted to achieve height without it being seen from the street, with low intru- sion on the neighbourhood,” she says. One option was simply to build upwards


but, the architect confirms, “the council said that was a non-starter as it did not look proportionately right”.


Another factor to be considered was that the building next door – now used by retailer Tesco and a housing association – was once part of Osram’s operation, and a striking cupola remains from this. Planners wanted to retain visibility of this from the road from central Hammersmith and simply building upwards would have obscured it. Tiedemann says: “In conversations with planning officers they initially assumed we could only add a single floor, but we opted for a curved roof that slants back, so the closer you get, the less you see of it. Because of the geometric proportion of the roof we accommodated three floors in there.” The roof is a tubular steel structure with steel nodes and the glazing is a mix of transparent and opaque panels to control solar gain. “We retained the parapet and built the transfer zone so the only connection between the roof and new floors is on the fourth floor and at the top”. Facade contractor Seele prefabricated all parts of the roof and transferred them to the site. The 50,000 ft2


roof extension is a diagrid


glass roof, which presented several challenges such as predicting how comfort- able it would be to situate a working environment under a large area of glass. Engineering consultancy Hilson Moran undertook extensive modelling of internal conditions and air distribution to establish the correct volume of shading needed. The roof’s curve left limited space for


plant, which is accommodated in a well at its centre.


Hilson Moran director Martin Murphy


says: “Complex redevelopment schemes such as this require modelling and analysis to ensure the right building services systems and solutions are in place to create an optimum workspace, in this case both in the new extension and in the historic listed building.”


Below the roof, Collado Collins had to devise a way to use the existing building. Aside from it being listed, the new occupant – retail customer information provider Dunnhumby – came on board early and wanted to keep the large open spaces to facilitate its style of working. Tiedemann says: “Once we got full access


ADF JANUARY 2018 WWW.ARCHITECTSDATAFILE.CO.UK


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