Property auctioneer McHugh said the home in the borough of Haringay was built in a driveway between two neighboring homes in 1996 and was a rental property until it was purchased by its current owner earlier this year.
The home, measuring about 7 feet wide, boasts a kitchen, a bathroom and a reception room on the ground floor with two bedrooms on the second floor and a loft above.
"My friends said I was mad to buy it. But I knew I had to. I'm confident there are quirky people who will want to buy it -- as it's cheaper than many one-bedroom homes in this area," the owner of the home told the London Evening Standard.
The home will be auctioned Oct. 1 at the BAFTA headquarters in London with a suggested opening bid of $386,876.
"You can get £1,300 ($2,140) rent from a place like this. If I don't sell it I'll hang on to it," the owner said.
The home is among the narrowest in London, but falls short of the 65-inch record set by a miniscule home in the Shepherds Bush area.
The narrowest house in Britain is located on the island of Great Cumbrae and measures just 47 inches wide.