A house measuring just 5ft 5in (1.65m) wide in some parts is on sale for more than half-a-million pounds.
Estate agents said the house is a good entertaining space
Estate agents Winkworth described the five-storey home in Shepherd's Bush, west London, as "utterly amazing and almost certainly unique".
It has a patio and a roof terrace, up to three bedrooms and a number of bespoke pieces of furniture.
The property's owners have often worked in the media and the agents said it would suit the "boho" market.
Former owners include the photographer Jurgen Teller who converted the property into a home from a hat shop.
The current owner is a casting director who has lived there for 14 years.
Simon Waller, senior sales negotiator at the Shepherd's Bush branch of Winkworth which is managing the sale, said the uniqueness of the house warranted the price tag.
"No, I don't think it's expensive," he told BBC News, "there's nothing to compare it to.
"You can't say 'does it cost the same as the one like it down the road?', because that doesn't work because there isn't another one."
He said a young couple who work in the arts would be particularly suited to the house, but perhaps not families due to the spiral staircase.
"It's really for anyone who wants to be a little bit left of centre, a little bit bohemian but still wants a nice home," Mr Waller said.
"It's a fantastic entertaining space and I've been lucky enough to have been to a party there in the early 90s - it went on for four days."
At the widest part, which is the dining room which opens out onto the patio, the house measures about 9ft 11in (approx 3m).
Mr Waller said the house had always sold for a premium price in the past and he expected it to do so again.