Dalkia Completes Decarbonisation Scheme at Arup’s London HQ 

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• Dalkia Completes Decarbonisation Scheme at Arup’s London HQ 

16 December 2025

The £3.1 million scheme to decarbonise Arup’s headquarters at 8 Fitzroy Street is now complete.

Dalkia has delivered the validation, detailed coordination, fabrication, installation, and commissioning of new low-carbon heating and cooling systems.

Two existing gas boilers and two chillers were replaced with air-source heat pumps using R513A refrigerant, which has a global warming potential that's 56 per cent lower than the R134a refrigerant it replaces.

The new system delivers heating and cooling with efficiencies between 300 and 400 per cent, which is a significant improvement on the 85 per cent efficiency of the former gas boiler plant. The domestic hot-water generation system was also upgraded from gas-fired water heaters to four CO2-based heat pumps. Together, these upgrades are expected to reduce annual carbon emissions by approximately 250 tonnes of CO2, equivalent to the yearly emissions of more than 150 average UK homes. 

The firm has committed to becoming a science-based net-zero organisation by 2040. 

Glyn Fells, Project Director at Dalkia, said: “This project shows what can be achieved when design innovation and expert engineering delivery come together. 8 Fitzroy Street is a powerful example of practical decarbonisation in action, reducing operational carbon while maintaining comfort and performance in a fully occupied building.

Stephanie Welch, London Office Leader & Head of WFM at Arup, added: “8 Fitzroy Street is more than just Arup’s headquarters - it’s a reflection of our Net Zero Plan in action. By decarbonising our own estate, we’re demonstrating our commitment to science-based targets and leading by example in the transition to a low-carbon future. This retrofit is a tangible step toward our goal of becoming a net zero organisation by 2040, by applying our own sustainability principles to the buildings we design, own and occupy.”

Picture: a photograph showing a crane delivering a large HVAC unit outside 8 Fitzroy Street. Image Credit: Dalkia

Article written by Ella Tansley | Published 16 December 2025

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