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One Exchange Square reimagines a 1980s office building and demonstrates how novel methods can be used to expand commercial floor space on a large-scale cut & carve project whilst minimising carbon impact. The whole building has been redesigned to deliver healthier working environments with roof terraces, interior planting and a diversity of uses contributing to a revitalised whole.
The project delivers a substantial 11-storey, 7.5m extension above London Liverpool Street Station without foundation strengthening, avoiding the significant embodied carbon associated with new basements and deep piling. An exoskeletal transfer truss and hanger system redistributes loads back to the retained structure, enabling 94% structural retention by volume, prioritising flexibility and material efficiency. Preloading the structure and removing it as the facade was installed minimises movement of the cladding system.
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1 Victoria Street, Westminster, is a historically layered site undergoing transformation into a responsible and future-focused mixed-use facility. In partnership with Mitsubishi Estate and architects AHMM, the project reimagines a building last redeveloped in the 1960s into a sustainable, mixed-use destination that responds sensitively to its heritage context adjacent Westminster Square.
Originally constructed as luxury flats in the 1840s and later adapted for office use following World War II damage, the building is now being renewed to meet contemporary commercial and environmental demands. Up to 52% of the existing structure will be retained by volume, significantly reducing embodied carbon, while new extensions, high-performance façades, upgraded MEP services and reconfigured cores complies with modern regulation while reducing climate risk to the asset. The scheme introduces active retail at ground level, high-quality office space above, and biodiversity-rich green terraces at upper levels. Together, these interventions demonstrate how adaptive reuse can balance heritage, sustainability and long-term urban vitality.
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Retrofitting commercial buildings is critical to reducing energy use and carbon emissions, yet delivering viable projects remains complex. No two buildings, clients, or regions are the same, and a business case that works in London may not stack up in Birmingham, Manchester, Liverpool, or other regional markets. Local economics, regulations, asset values, and investor expectations all influence retrofit decisions.
This session explores how regional market dynamics shape retrofit strategies, from return-on-investment pressures to planning and compliance considerations. It will examine why decarbonisation measures particularly heat pumps can be essential but difficult to justify, depending on building typology and local conditions.
The panel brings together developers, asset owners, and building managers from across the UK to share candid perspectives and real-world examples. Gain practical insights into how retrofit and decarbonisation business cases are being tailored regionally, and how to make projects viable beyond a one-size-fits-all approach.
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