Extensive redevelopment of Denys Lasdun’s Grade II listed IBM Building, retaining 80% of the structure and adding 40% additional area to create a modern, adaptable and low-carbon workplace.
Structural embodied carbon
160
kgCO2e/m2
80% of the existing building retained
A saving of 45 tonnes of embodied carbon
24
Tonnes of reused steel
Key features
Additional floor and extended floorplates
We added a new storey to the existing building, as well as multiple floorplate extensions to east and south elevations.
Core restructure
We removed and replaced the existing stability cores with new reinforced concrete structure.
Reused foundations
We justified the reuse of the existing pad, raft and piled foundation under the proposed increased loads.
Constrained site
Situated close to the River Thames and the National Theatre.
Drainage coordination
Incorporated blue roofs and permeable paving into the building fabric to omit the use of attenuation tanks. Close coordination with the design team allowed the existing drainage to be reused and limit breaking out of the existing structure.
01-04
Existing
“The 76 Southbank scheme stood out in this year’s entries. This Grade II listed building, whilst coming to the end of its first design iteration still offered huge potential to adapt and retain its place in the Southbank landscape and move into its next phase of life. The project team have successfully brought the building up to date with the latest sustainability thinking and design flair and adding further future adaptability and flexibility. This is a fantastic project, showcasing what thoughtful retention, intervention and imagination can achieve in terms of producing the next generation of London office space.”
John Davies, Head of Sustainability, Derwent London (judging the Civic Trust Awards 2026)
Awards
Existing
Demolition
Post demolition
Proposed
