The Mayville Community Centre was the first ultra low energy, Passive House retrofit community centre in the UK, completed in 2012. Government funded research has found overall energy savings of 85.5%, while providing 35% extra space and in spite of greatly increased occupancy. The additional cost over a minimum standard building regulations refurbishment was only 7%. This multi-award winning project is the sole UK representative in the International Energy Agency's report on deep energy retrofits, published in 2017. With two roofs planted with wild meadow seeds and sitting within carefully landscaped, ecologically sensitive gardens complete with areas for growing fruit and vegetables, the refurbished community centre looks cleaner, brighter, and more open and inviting for all. The refurbishment of the existing building focused on providing more usable space without increasing the overall size of the building, and on reducing the building's energy consumption so that running costs will be considerably reduced. The result is a community resource that is both comfortably warm in the winter and cool in the summer whilst acting as a welcoming hub for the local community. The refurbishment has been designed by bere:architects in accordance with the German Passivhaus standard with the result that the building will consume 95% less energy than it currently does if occupancy remained the same as pre-retrofit. The Passivhaus principle was developed in the 1980s by German physicist, Dr Wolfgang Feist. The main improvements being made to achieve certified Passivhaus standard are: High levels of insulation: Triple glazed windows: A draft-free building envelope achieving no more than 0.6 air changes per hour at 50 pascals with an efficient heat recovery ventilation system installed to ensure a plentiful flow of fresh air, warmed by the extract air in the winter and a comfortable living environment. These measures save a lot of heat energy that would otherwise go to waste and enables other forms of renewable energy production to become viable, the following of which are being employed at the community centre: 116 m2 of photo voltaic panels fixed to the roof will generate 18kWp of electricity; 3m2 of solar thermal panels on the roof will provide most of the hot water the community centre will require; a ground source heat pump installed under the garden will heat the radiators when space heating is required. Ultimately, Mayville is a community centre that local residents can be proud of and a building that will serve their needs without wasting financial resources on large energy bills: a building that will stand as an icon for urban sustainability.