Careful negotiation with Local Planning Officers led to consent for a 2-storey extension to the rear of an end-of terrace house in Wimbledon. A transformative stepped extension provides a new kitchen and bedroom for a young family. A bespoke staircase allows daylight into the heart of the home, linking the old and new. The extension carefully responds to the neighbouring houses to avoid impacting on the natural light they receive. The conservation area setting is preserved by sensitive use of materials and the form of the new extension.