Despite the current average detached property value being £1,788,081 in Chelsea, the average price per square foot is £1,717, making the Britten Street house especially high in value.

The pint-size pad has a 166 sq ft ground floor reception room which acts as a living and dining room, with a small kitchen and downstairs shower room. Upstairs is a 124 sq ft bedroom.

Ed McCulloch, sales manager at Douglas & Gordon, said: "It is totally unique, a one-off. I've not seen anything in Chelsea which has a freehold and is smaller." Mr McCulloch said the property could be worth up to £1million, once it has been renovated.