Mimi De Costa and her husband Andre, a doctor, had spent years looking for a plot of land when they came across a bungalow in Kent.The original bungalowThey bought it for the site - 12 acres of organic pasture and woodland - and started to plan a new home for their sons, Sean and Tye, that would suit a lower impact way of living. But what they're building isn’t going to be a reproduction of the bungalow. It's a squarish, modular building, with glass walls from floor to ceiling. The outside of the building is clad in cedar that will go grey to match the surrounding oak trees.The idea is that by prefabricating most of the house it should be quicker and easier to put together on site. But although it will be precision made, it isn’t a kit house.