A glorious riverside house in west London refreshed and revived by Kate Guinness

Having bought the house next door to her west London townhouse, the owner called in interior designer Kate Guinness to gently layer styles and eras, filling the space with colour and pattern
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The ground floor sitting room is painted in Papers and Paints' ‘Empire Red’. The jib door that connects to the other house is hiding on the left beside the fireplace. A handmade shell mirror by Katherine Lloyd hangs above the chimneypiece. The ottoman is by Kate Guinness Design.James McDonald

The extra 2000-square footage gained ‘has been put to hard work,’ says the owner. ‘We sleep in one house, and the other is functional.’ There are guest bedrooms and new bathrooms, two studies, a family TV room and guest loo, a utility and boot room, all resplendent in colour. Two secret doors in the living room and study quietly unite the two houses. There is nothing of the lateral conversion here. Stepping from one to the other you feel as if you have wandered in to the rambling wing of a country house.

By contrast with next door a great deal of the original details had survived (and are now listed). Bedrooms have pretty grates and cupboards tucked in to alcoves; there are dado rails and deep cornices. In the first floor living room, sunlight spills through the three sash windows with their riverine views – the flat barges ploughing a foamy course and cruisers with their fluttering flags, the scullers, their oars skimming the dark water.

Kate Guinness fills a formerly minimalist Kensington house with joyful colour and pattern
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A less romantic aspect of riverside living is damp. In the basement, the undulating original wood herringbone floor had to be lifted – block by block – restored and reinstated to reverse decades of water damage. It is a now a games room, where the billiards table has a removable cover that allows it to multi-task as dining or card table. Instead of predictable green, the baize covering is a ‘fun’ deep purple – a nod to the depth of the pink walls. Kate's cousin, the specialist painter Molly van Amerongen mixed the paint built up in four, breathable layers over the original, lath-and-plaster surfaces.

These vivid colours owe much to Kate’s childhood, in Ireland, visiting the historic houses of her family. ‘When I was there recently, I realised quite how bold the schemes are: the turquoises and yellows, a bright red dining room. It’s a different sort of palette. When I choose colours now, it’s an instinctive thing. I respond to the client – the sort of atmosphere they want to create – and the house itself.’

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In the bootroom, woodwork in Farrow & Ball's ‘Arsenic’ forms a bright foil to Neisha Crosland’s ‘Pollen Emeraldo’ wallpaper (stocked by Turnell & Gigon).

James McDonald

Before setting up her practice, in London, Kate also spent five years as a set and costume designer for theatre and opera, including the Wexford Opera Festival . There are parallels with set design and what she does now: ‘It taught me the importance of detail and how to develop other people’s ideas: in this case the director and dramatist as ‘client’. It also taught me how to think about volumes as the basis for decoration.’

She enjoys finding antiques, or commissioning pieces from interesting makers – and encourages her clients to do the same. A few bits of furniture – including some long serving armchairs - travelled from next door. The rest are newcomers. In one bedroom, the ‘Denyer’ bedside table with its crenellated edge - named after one of Kate’s colleagues – is part of her new collection of furniture. There are shell-encrusted mirrors by artist Katherine Lloyd and a graceful standard lamp by Cox London in the drawing room. The planners vetoed built in joinery here, so a pair of freestanding bookshelves flanking the marble fireplace, by furniture maker Alfred Newall, was the solution.

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In the main bedroom, Kate designed the headboard, and the bedside table is also by Kate Guinness Design. The rug is by Larusi and a Simon Playle fabric has been used for the blind.

James McDonald

In the family sitting room, steeped in a deep Marrakech pink, the ottoman with its handy shelf and Kente cloth upholstery is another of Kate’s designs. Look closely and you might spot the neat jib door, which leads to the other house. Disguised with a dado rail and painted to melt in the setting, it looks as if it has always been there.

Kate Guinness is a member of The List by House & Garden, our essential directory of design professionals. Find her profile here.

Kate Guinness: kateguinness.co.uk