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Restoration of 1930s tec’
January 2018

Steel-look windows by KAWNEER helped in a £17 million project to rescue a partly-derelict former technical college in Enfield, North London, that was part of Middlesex University.

The company’s GT70 slimline renovation windows as fixed lights and top-hung casements were used alongside by AA100 curtain walling, AA541 fixed lights and top-hung casement windows and series 190 doors on the redevelopment.

Now the 1,680-student secondary school and sixth form Heron Hall Academy, the redevelopment comprised the refurbishment, remodelling and extension of the unoccupied 1930s Grade II listed technical college over two years by main contractor Willmott Dixon.

The glazing systems were installed over a year by JPJ Installations, the GT70 windows replacing the original steel windows on the Art Deco façade and the mullion-drained curtain walling, AA541 windows and series 190 heavy duty commercial entrance doors on the concrete frame extension.

Katie Robinson, project architect with designers ArchitecturePLB, said: “The Crittall windows are key to the character of the original building and therefore it was fundamental the replacements where faithful to the original design. Window replacement was considered key in meeting current Part L requirements. It was a contentious issue that was much debated with the planners as it was key to making the project affordable.

“Aluminium was chosen due to the need to achieve a thermally-broken double-glazed unit with a narrow profile. We were able to keep the profile of the frames to a minimum and replicate the protruding fins on the original windows.

“We could also achieve a narrow frame depth which enable us to retain the important heritage item of the existing terrazzo cills in situ during the works. These would have broken up if they had needed to be removed.”

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