For both Chloe and the architect, Billy Mavropoulos, it was vital that the house worked as a whole. Downstairs the main focus was 'to get the biggest party place'. The front of the house retained its original layout and features while the back was completely opened up to become the main living space, which is white, airy and minimal. To achieve this, Billy explains, they created a 'glass box', into which they 'slotted' the new space. Glass sliding doors, 3.2 metres in height, form the entire back wall, their tops disappearing beyond the ceiling so that, from the inside, the frames are invisible. 'We wanted it to be thin and fragile-looking,' says Billy. Everything is aligned and thought through - for example, the skylights over the sitting and dining areas continue the lines of the side windows in the floor above.