The wedge-shaped home has been designed for a musician and features a large basement living room which will house a grand piano.
According to the practice, Lewisham Council's planners wanted to keep this symbolic gap and 'the challenge was to keep the sense of openness whilst creating a small dwelling.'
Michael Trentham says: 'It was refreshing and encouraging to have won permission in a conservation area, which was the result of a rewarding dialogue with [the authority] who saw the development as a positive contribution to the conservation area, adding a new layer of heritage to the predominantly Victorian one.
'The wedge shape of the plot gave a natural layout for the main space containing the piano.
'The floor above is designed to float within this space, being surrounded on all three sides with a double-height void, which allows the basement to be filled with natural light'