Quadrangle, Cheltenham

The Quadrangle building in the historic heart of Cheltenham, once a 1970s landmark, has been completely transformed into a contemporary mixed-use commercial development featuring exclusively AluK window, door and curtain walling systems.

Designed by AWW Architects from their Bristol studio and completed by Beard Construction, it now features an inner courtyard, ground floor retail space, four storeys of open plan workspace and the town’s first rooftop restaurant.

The fenestration package was absolutely key to retaining the design language of the original building within a more contemporary aesthetic, whilst also meeting the requirement for improved thermal efficiency, more natural light and better natural ventilation.

Having been impressed with the design and quality of AluK products on previous projects, AWW specified a comprehensive mix of AluK systems at the Quadrangle – the SG52 capless curtain walling system to give a frameless appearance to the retail façade, the more conventional SL52 capped curtain walling system for the courtyard area and rooftop restaurant, the GT55 system for the entrance doors, and the tried and trusted 58BW window system for the 400+ windows fitted into the existing openings around the façade.

The entire fenestration programme was carried out by AluK fabricator Aluminium Sashes, which used its extensive experience in the repair and replace sector to overcome the challenges inherent in surveying, fabricating and fitting windows into openings which, in many cases, were irregular in shape and form and not aligned with the concrete slab finish.

Aluminium Sashes worked closely with AluK at planning and detailed design stage to achieve the contemporary look for the façade that the client and architect wanted. For example, where the original windows had a transom and modesty spandrel panel below, the slimmer sightline replacements replicated the line of the transom but with fritted glass below to provide a similar level of privacy with more natural light. They also designed a solution for fixing the anthracite grey windows to the metallic bronze louvre sections specified to break up the uniformity of the façade, give users the option of manual ventilation and to provide fresh air and exhaust points for the AHUs. The reinforcing bar in the windows has effectively become the carrier bar for the louvres and gives the impression that there are two colours in one window panel.