A converted warehouse in south London with the airy feel of a New York loft

Having lived in this converted warehouse in south London for eight years, the owners enlisted the help of 23 Architecture and interior designer Nicola Mardas to capitalise on its expansive interiors without losing all sense of its history
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The open-plan space is dominated by the staircase, which is a timber structure covered in clay plaster. Behind it is a study area with a c1960 rosewood desk by Jorgen Pedersen for E Pederson & Son and a wall of bookshelves. In the sitting area, shelves are lined with smaller photographs by artists such as Vasantha Yogananthan, Shomei Tomatsu, Bruce Davidson and Guido Guidi.James McDonald

The curved staircase, which replaced a minimalist 1990s version, is equally unusual. Its white surface appears to be made of concrete but is, in fact, clay plaster layered over a timber frame. A new study, where a door to the garage is set within bookshelves, is tucked behind it. There were other changes, too, including the removal of sets of surplus-to-requirement doors into the sitting room, which adjoins the kitchen. On the first floor, lit by a skylight, a mezzanine was taken out to reshuffle the floorplan, a TV room was added and the main bedroom redesigned. A new bathroom glows with travertine and tadelakt walls.

Though Nicola’s default decorating mode is infused with colour and pattern, she did not feel this would work here. ‘I had to find ways to introduce contrast but with restraint,’ she says. Snowy white walls were swapped for warmer tones: ‘One shade lighter here, one darker there.’ The enchantment happens as the light shifts, turning them from purple to pink – like a kaleidoscope. It was the same for fabrics and furnishings: subdued linens and cottons, seagrass flooring and swishing linen curtains chosen for texture.

Hans J Wegner's 'Wishbone' chairs partner a 'Tulip' dining table by Eero Saarinen for Knoll. The photograph between the windows is by Josef Koudelka and the large work near the staircase by Adam Fuss.

James McDonald

Upstairs, Nicola had the landing walls lined with tatami matting, traditionally used on the floor in Japanese houses. In the main bedroom, the beams were scoured of varnish and then painted to match the walls, framing the space, rather like a chapel roof.

As a self-confessed photo geek growing up in New York, the owner learned how to develop her pictures in her school’s darkroom. Her first purchase was a work by celebrated 20th-century American photographer William Klein. Since then, the owner has branched out, buying works by contemporary names such as Adam Fuss. ‘I don’t have a theme – I buy with my heart,’ she says.

Much of the furniture has personal connections, too. A marble-topped chest of drawers in the bedroom served as a changing table when the owner was a baby, the Korean chest in the sitting room is an heirloom, and she cannot remember a time when the Flemish tapestry ‘was not part of my life’. This now hangs in the dining room, adding another layer of story to this intriguing home.