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Willmott Dixon is the UK’s leading Passivhaus contractor with a series of high-profile projects in our portfolio, from the largest non-domestic project, the centre for Medicine at the University of Leicester, to the largest secondary school, the Harris Academy in Sutton.

Core Passivhaus principles include a highly insulated and airtight fabric, coupled with mechanical ventilation and heat recovery to reduce energy use and carbon emissions, whilst keeping buildings warm in winter and cool in summer. The standard now includes the use of renewable energy generation in the certification assessment (Passivhaus Plus and Premium), making it the ideal design standard to achieve net zero carbon.

Passivhaus projects are much less prone to performance gaps, delivering as built performance very close to designed targets. This is achieved through sound design principles, rigorous quality control and a robust certification process, overseen by the Passivhaus institute in Germany. At Willmott Dixon we complement this with Energy SynergyTM, our own process to monitor operational energy use against design targets.

However, Passivhaus doesn’t just deliver impressive energy performance - it puts a strong emphasis on its comfort and health credentials too. This is achieved through thermal bridge free and draught free construction that ensures surface temperatures never fall below 17ºC to eliminate mould risk. The ventilation system is designed for optimum indoor air quality to deliver filtered air as standard.

Willmott Dixon has a track record of collaborating with experienced Passivhaus practitioners, such as Architype, the UK’s best known Passivhaus architectural practice, and Passivhaus certifiers WARM, one of the longest established practices and training provider.

We are a founder member of the UK’s Passivhaus Trust, an independent, non-profit organisation that provides leadership for the adoption of the Passivhaus standard and methodology in the UK. We participate in regular knowledge sharing events and technical panels, to stay at the forefront of Passivhaus developments. Several of our people have now successfully completed Passivhaus training.