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.

767-Brunswick-Gardens

Brunswick Gardens, Kensington W8. A house that has been rebuilt to include a basement development with a cinema, gym, bar and a wine cellar. 6 beds, 5 baths, recep, kitchen/dining room, study, garden. £12.5m John D Wood 020-7908 1100.

Brunswick Gardens, Kensington W8. A house that has been rebuilt to include a basement development with a cinema, gym, bar and a wine cellar. 6 beds, 5 baths, recep, kitchen/dining room, study, garden. £12.5m John D Wood 020-7908 1100.

767-Chesham-Lodge

Chesham Lodge, London SW1X. A double-fronted house in Belgravia with two floors below the ground floor. It has an open-plan kitchen and family room on the first basement level and a gym and cinema on the floor below. 5 en suite beds, recep, study, lift, balconies, garage. £12.75m Savills 020-7730 0822.

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767-Clabon-Mews

Clabon Mews, Knightsbridge SW1X. A mews house that has been redesigned to include a basement with media room, gym and wine store with space for more than 140 bottles. One of the rooms has a retractable glazed roof. 4 beds, 5 baths, recep, garage. £8.495m Strutt & Parker 020-7235 9959.

767-Donne-Place

Donne Place, London SW3. A terraced house in South Kensington with a period faade. It has been substantially rebuilt to include a basement development with a media room and a gym. The house has underfloor heating, air conditioning and integrated audio technology. 4 beds, 3 baths, 2 receps, kitchen/family room, terrace. £6.67m Ashdown Marks 020-7589 3353.

767-Lindisfarne-Road

Lindisfarne Road, Jesmond, Newcastle upon Tyne. This 1900s house has been converted into a luxury property that includes an indoor pool and eight-person Jacuzzi, a games room and cocktail bar. 6 en suite beds, 3 receps, orangery, courtyard, gardens. £3.995m Sanderson Young 0191-223 3500.

767-The-Orchid-House

The Orchid House, St Lawrence, Isle of Wight. An award-winning house created from a Victorian orchid house that overlooks the English Channel. The lower ground floor houses a reflective pool beneath the original brick-vaulted ceiling. 4 beds, 4 baths, 2 receps, conservatory, cinema, gym. £2.25m Biles & Co 01983-872335.

767-Wellington-Close

Wellington Close, Notting Hill, London W11. A luxury house created out of converted offices and situated on a cobbled cul-de-sac. It has white oak floors and underfloor heating. 4 beds, 4 baths, dressing room, recep, dining kitchen, garage, terraces. £7.5m Savills 020-7727 5750.