A rear extension to a modest two-storey terrace house in south west London. The full width extension is designed to incorporate a small planted courtyard area bringing the exterior into the interior and vice versa. The seating area has garden on both sides, creating a sense of detachment from the main house. The courtyard also enables ventilation and natural light to be retained to the existing bathroom window and kitchen area. To keep on site construction costs down, the main structure is built using SIPs panels that are clad in brick slips. The building sits on an innovative foundation system manufactured by Quickbase.