The tiny terraced house in a former mining town in the Welsh Valleys sold for £15,500 in an auction.
The property, which requires complete renovation, was expected to sell for £8,000.
The one bedroom house in Brynmawr, Blaenau Gwent, South Wales, features an outhouse toilet.
A couple from Stratford-Upon-Avon bought the house and intend to spend a further £20,000 renovating the property.
The property is one of the cheapest houses on the UK market,