The new extension is made of three different structural parts.  The first part is the proprietary metal framed glass roof and elevation.  The second part consists of two cross braced steel frames spanning 10m and is designed to provide the main lateral stability to the new extension.  The frames are covered with a solid timber roof and a new cavity brick vertical cladding wall.  The third extension is made of the structural glass.

The structural glass design involved double glaze units structurally bonded together and detailed in such a way so that the roof glass panels were spanning 2.5m between the new stability steel frame and new 4m high vertical glass panels.

Most of the glass structure is frameless apart from a new vertical cantilever stainless steel frame around the large sliding door opening at the rear elevation.  In order to keep the frame slender at the rear elevation, the glass panel above the door frame is designed as a beam supporting the glass roof panels and spanning between the stainless steel frame posts.