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RIBA's refurbishment of 66 Portland Place seeks significant energy and carbon efficiencies, targeting a 42% reduction in energy consumption and a 66% decrease in carbon emissions per person per year. The project employs a services-first strategy, introducing air-source heat pumps while preserving the heritage of the Grade II*-listed building.

The refurbishment is aligned with RIBA's sustainability goals, including substantial improvements in indoor air quality, water efficiency, and biodiversity. This pilot project contributes to the UK Net Zero Carbon Building Standard's evolution and aims to make the building more accessible and welcoming.