Project Description

A transformative retrofit project providing modern workspace and affordable housing on the fringe of the City of London. The existing mid-rise 1960s building was extended upwards by 70% – adding 13 storeys on top of the existing 16, and effectively doubling the leasable area by simply reusing its existing frame and foundations.

Judge’s comments

A highly intelligent, well-integrated retrofit-first extension of city office space. This project is a fantastic example of how we can meet the requirement for creating sustainable cities and communities. 

Enormous amounts of works were required to carry out inspection, investigation and analysis of the condition of the existing building and as a result the existing structure and existing foundations could be utilised. 

Through a granular analysis of the existing structure, most of the new loads were strategically directed into areas with spare capacity, allowing a minimal intervention of column strengthening and additional foundations. This saved around 35% in ‘up-front’ carbon when compared with an equivalent new build.

Project overview

Structural Designer

  • AKT II

Client Name

  • CIT Group


  • London, UK


  • Horden Cherry Lee

Principal Contractor

  • J Coffey Group MACE

Key Contractors

  • RHB Partners – M&E Consultant

    Arcadis – Quantity Surveyor

    DP9 – Planning Consultant

    Churchman Landscape Architects – Landscape Architect

    Berry Piling – Piling Contractor

Year Submitted

  • 2022

Key attributes

  • Planet, Process

    Photography credits: AKT II