The understated London home of couturier Anna Valentine

Her eponymous clothing label is desired for the quality of its designs and the attention to detail - attributes that couturier Anna Valentine has also employed in the renovation of her London flat

Her clothing is carefully constructed at the early toile stage, when the design is tested. 'I like ease of movement in a garment but, although it might be loose, a lot of thought has gone into where it fits on the body and where it doesn't.' Anna demonstrates this principle by holding up a sweater. 'It is loose-fitting, but it has skinny sleeves and the collar is high. You have to have it fitting somewhere and then it will not look too big.'

Ten years ago, Anna received her most extensive press coverage to date when she was asked to design the wedding outfit for Camilla, Duchess of Cornwall. 'We were given six weeks to make it, and I was panic stricken,' she admits. 'We took inspiration for the colour from a pale-blue chair in Clarence House and the detailing from a piece of jewellery belonging to her mother. Since everyone knew that we had been commissioned, we could not - for security reasons - call our normal suppliers to ask if they had any blue fabric, so we ended up using a furnishing fabric from Bruno Triplet at Sahco in Chelsea Harbour Design Centre. It was a heavy silk shantung that we washed continually to remove all the starch. When the coat was finished, the design was hand-painted.' It was universally felt the result was just right.

Anna is married to Jonathan Berger, an entertainment lawyer. The couple were introduced 23 years ago by Anna's cousin, who was a work colleague of Jonathan and felt he needed a distraction from the office. Today, they live with their lurcher Genghis in an airy first-floor flat near the atelier. 'When we moved in, it was ghastly, having not been touched for 30 years. It had a pale-yellow Formica kitchen, a plastic floor that crunched underfoot and everything was painted magnolia. The bedroom cabinets looked as if they were for a Sindy doll, and we ripped down the curtains and pelmets as soon as we arrived. It was exactly what we wanted as we could start from scratch,' Anna says with a laugh.

It took them three years to decide what they wanted to do. Being east-west facing, the flat got morning and evening light, but they could not capitalise on this as there were two rooms at the front and a corridor through to the bedrooms at the back. With the help of architects RDH, all the partition walls were removed, flooding the flat with light from front to back. A long, freestanding run of cupboards provides privacy in the bedroom and has created a corridor to the rear.

The open-plan kitchen is calmingly minimal and the whole interior is painted in Farrow & Ball's 'Old White'. Outside, in the shared areas, Anna has persuaded the owners of the other flats to strip back the communal stairs and hall to the original stone, transforming the stuffy interior into a clean, bright and welcoming space they all love. There is, however, one fly in the ointment of this pale tranquillity. 'I used to drive Jonathan mad saying I had nothing to wear, which was true, since the workroom was always busy making clothes for clients. Now I have a ready-to-wear range, I can order pieces and get them made somewhere else. Jonathan is concerned that we don't have enough space and he will have to give up one of his wardrobes!'