PROJECT REPORT: ADAPTIVE REUSE 55


and facade solar cells, a sedum roof and rainwater harvesting tanks, the water from which is used in fl ushing the building’s toilets. Alongside the improved insulation levels, the building has seen a signifi cant reduction in energy consumption of 75%, dropping from 204 kWh per square metre to 52 kWh per square metre. The effort that went into saving and improving the existing structure paid off – Lumi scored 99 out of 110 points in the LEED certifi cation system, earning the desired LEED Platinum certifi cation. This makes it not only the highest scoring project in Europe but also reportedly the highest LEED scoring offi ce building in the world. The project has reported roughly 190 kg CO2


e/m2 , estimating that for a


comparable new build that fi gure would be around 300-400 kg CO2


e/m2 .


The project has been recognised in the wider industry with award wins – ‘Building of the Year – LEED category’ at the Sweden Green Building Awards 2025, and ‘Best Retrofi t & Reuse Building’ at the UK Life Sciences, Tech & Research Clusters Awards


2026. It’s the third time White Arkitekter has won the former, having received it in both 2022 and 2023 for other offi ce buildings designed for Vasakronan. The reuse programme itself went “very well,” says Tväråna, thanks to the “strength of the project management and procurement team, who shared the ambition of maximising reuse from the outset,” he adds. Specialist contractors for certain elements – such as the facade and ceilings – were appointed by the team which meant they were able to avoid relying on “multiple layers” of subcontractors. As well as the recognition the project has had in the form of its world-beating LEED certifi cation and clutch of award wins, it has also been very received locally and by clients, with the building fully let before it was completed. It’s proof that challenging perception and pushing boundaries can pay off, as Tväråna concludes: “Lumi gave us the chance to demonstrate that reuse can deliver ambitious, contemporary architecture while signifi cantly reducing the environmental impact.” 


“The building was


modelled in extraordinary detail, enabling accurate planning, cost control, and construction coordination”


ADF OCTOBER/NOVEMBER 2026


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