Very vertical. The slope of the street makes it quite interesting. The glass garage door (by appearance) highlights the slope. I imagine it's interesting to open and close that. Besides that, three cheers for modernism ~
London house extension on Alwyne Place by Lipton Plant Architects, The rear is framed in Staffordshire Slate Blue Smooth brick. the glass roof creates the connection between the upper and ground floor area and serves as a roof terrace.