This is Etch House by Fraher Architects and their sister joinery company Shape London. Lizzie and Joe - the directors of Fraher - gutted their Victorian terraced house and totally reconfigured the floors, walls and staircase to create a completely different space. It was fascinating to shoot something so different within the familiar confines of a South London terraced house (very familiar, 'cause I live in one!). There is more about the project in a write up on Dezeen: https://www.dezeen.com/2017/11/08/etch-house-fraher-architects-renovation-extension-london-uk/. Lots more photos below...