Iceberg houses on the market

Properties with large basement extensions from an award-winning redesign of a Victorian orchid house on the Isle of Wight to a four-bedroom mews in Knightsbridge, London.

767-Betterton-Street

Betterton Street, London WC2. A refurbished townhouse with a contemporary interior behind a period faade. The basement has a gym and steam room and a separate media room with 3D projector and surround sound. 4 beds, 4 baths, 3 receps, rooftop terrace. £7.5m Knight Frank 020-7499 1012.

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