Winner 2022

The Supreme Award for Structural Engineering Excellence

Award for
full exploitation of an existing structure to maximise retrofit potential

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

Hylo could only have been achieved through masterful structural engineering. A 13-storey building was added on top of an existing 16-storey building, with only the most essential strengthening works necessary to the existing frame and foundations. This was achieved through redirecting load paths, and allowed the designers to exploit the inherent robustness in the original structure – in essence, they cashed in on previous carbon footprint to save carbon on the extension. A quite brilliant example of structural retrofit.

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