The Travertine Stair was the focal point of an ambitious residential project which sought to unite two apartments in a listed building in central London and transform them into a comfortable duplex for our client to live and entertain in. In the double-height volume created in the existing floor plates, a new staircase was conceived as a bold, sculpted form uniting the apartment. The stair is a self-supporting solid stone construction with a strong yet graceful presence. Large blocks were carved into solid units of three stairs each, giving the stair a clear tectonic that required master stonemasons of real skill. A rare and beautiful silver-grey travertine was chosen for the stair and the floors throughout for its varied layering and colour tone.