A three-sided glass-box addition to a Grade II-listed house replaces a poorly used 1980s annex, easing flow around the house and garden with rear glazing and a glass floor. The glass cuts across the floor of a new glass study on the upper ground, creating sightlines to the enhanced kitchen/diner below. A skylight echoing the study floor increases natural light. The listed Georgian brick now serves as a feature wall between the study and reception rooms, and can be viewed from the garden through the uninterrupted glazing. We also added a basement and front light well to the front of their listed building in Islington.