Date & Time

19 April 2023
18:00 - 19:30 BST





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HYLO: maximising retrofit potential of existing structures

Date published
Date & Time

19 April 2023
18:00 - 19:30 BST





The third technical lecture of the 2023 series outlines the design approach and technical challenges in delivering HYLO, a high-rise development at the heart of London, whose project team was awarded for full exploitation of an existing structure to maximise retrofit potential at the 2022 Structural Awards.

HYLO, the joint winner of the 2022 Supreme Award for Structural Engineering Excellence, is a transformative retrofit project of an existing 16-storey 1960s building, which has been extended upwards by 70% – adding an additional 13 storeys and effectively doubling the leasable area. The existing frame and foundations were all reused – with only the most essential strengthening works undertaken.

This technical lecture will describe the design process undertaken by AKT II to achieve this - starting with detailed investigation and back analysis of the existing structure, through to the design of the extension structure, the targeted strengthening and foundation reuse.
Through discussion of the technical aspects of the project, the lecture will also serve to highlight the inherent benefits of retrofit, as opposed to demolition and rebuild.

Reasons to attend

  • Gain appreciation of the importance of investigations and back analysis on maximising reuse of existing structure

  • Role of appropriate use of FE analysis in determining interfaces and strengthening between new and existing structures

  • Understanding of the inherent benefits through seeking to maximise reuse

Intended for

  • Graduates to Chartered Structural Engineers   

  • Designers

  • Architects


David Watson, Technical Director, AKT II Speaker

David co-leads AKT II in matters related to Climate Action. He is a structural engineer by training, with particular focus on adaptive re-use, design efficiency and material innovation. He has lectured widely on these topics at universities across the UK, Ireland, Sweden and the United States. Beyond Hylo, he has worked on the Stirling Prize nominated 100 Liverpool Street, the rejuvenation of the world’s first cast-iron framed building at Shrewsbury Flaxmill Maltings and the new home for the Museum of London at West Smithfield.

Michael Hynd, Technical Director, AKT II Speaker

Michael’s experience encompasses some of AKT’s highest-profile commercial, high-rise developments and retrofit projects. Beyond HYLO, Michael has worked on the Stirling Prize winning Bloomberg European HQ, which assimilated several existing pile foundations within a constrained site, and the 45-storey Highpoint Tower. He is currently the project lead on the extensive retrofit and enhancement of the former BT centre at Panorama St Pauls.

James Kingman, Associate Team Leader, AKT II Speaker

James has worked on many of AKT’s landmark developments throughout London, the UK and internationally. He specialises in structural engineering and computational design.


Email - [email protected]

Supporting Resources & Events


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Publish Date – 29 March 2023

Author – N/A

Price – £35 - £285 + VAT


Concrete Research & Innovation Physical Modelling Lecture Evening Metal - steel Public, Religious & Civic Sustainability & Environment Climate change Adaptability Assessment of Structures Retrofit Extension Construction management Structural analysis Best practice Inspection Surveying Estimating Project Management Frame Floor Foundation Architecture Loading Stress Conceptual Design IStructE London HQ Carbon

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