This project involved extending and upgrading the existing house to the low energy in use Passivhaus EnerPHit standard.

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Proposals included enlarging the open plan kitchen / diner to the rear of the house, taking advantage of views over the landscaped garden. At first floor a new master bedroom with dressing area and ensuite was created. The existing roof space was converted into two rooms - a study and family room.

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Energy saving measures included: External insulation with render finish to all external walls; upgrading the insulation to the roof; replacing the existing ground floor slab with a new, highly insulated slab; replacement of existing windows with new high performance triple glazed windows; installation of mechanical ventilation with heat recovery (MVHR). All of these measures have been developed within a thermal model which predicts energy use being reduced by 75% compared with an equivalent Building Regulations compliant house.

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Planning permission was granted in January 2017, with work commencing in February 2017. Completion was in the summer of 2017.

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After more than 3 years of occupation analysis of consumed energy data shows that the building has performed as well as, or better than, the thermal model created at design stage and that despite increasing the floor area by 50%, the annual energy consumption has been halved.

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The house was a shortlisted finalist in two categories in the 2018 LABC Building Excellence Awards.