The scheme is driven by a ‘re-use first’ approach with approximately 75% of the slabs and 70% of the structural steel frame being retained within the proposed 8-storey building. New interventions such as high-quality and thermally performing facades along with a lightweight 2-storey roof extension utilising low-carbon cross laminated timber (CLT) floor slabs will be introduced, delivering additional office floorspace in line with the Bunhill and Clerkenwell Area Action Plan and supporting economic development in Islington’s Central Activities Zone (CAZ). External landscaped terraces will increase biodiversity and target a high urban greening factor. It will also benefit tenants by providing external amenity spaces supporting health and wellbeing.
Materials re-use is prioritised, including proposals to reuse existing steelwork for the new roof extension and repurposing existing stone cladding into new internal floor and wall finishes. Where new materials are required, lean design principles will be utilised with use of low carbon materials and materials with high recycled content, positively contributing to the circular economy. Replacing the existing metal frame cladding with a responsive neutral-toned brickwork facade will improve the building’s thermal performance, allowing for more efficient heating and cooling, as well as optimising daylight to reduce reliance on artificial lighting. All-new mechanical and electrical services increase operational energy performance and shift the building to a fully electric design. An existing car park will be removed and the basement repurposed with new facilities to support cycling, walking, and running.
A new structure to the south-west corner of the site is expressed as a separate element adjacent to the Chiswell Street listed terrace. Treated with a rich and enhanced red brown glazed brick finish, this element will celebrate its unique position at the south end of Whitecross Street while formally addressing Chiswell Street with a reduction in scale and a new entrance lobby. Make is also integrating ground floor uses, such as retail units, to activate the street which is currently sterilised by inward facing office uses.
The choice of brick and glazed brick as the primary facade materials celebrates Islington’s history with the material adding complementary variety and texture to the heritage setting. The selected brick will also target a high percentage of recycled waste material in its production.
Matthew Bugg, project architect at Make, said: “Our vision for 48 Chiswell Street is to demonstrate that deeply sustainable, transformative architecture can be achieved by embracing the existing structure within a sensitive heritage setting. By integrating innovative materials, responsive facades, and generous green spaces, we’ve crafted a workspace that reinforces its sense of place, contributing to the vibrant energy of Whitecross Street and respecting the rich history of Chiswell Street.”
