It's the Grand Designs UK folly that was transformed from a 250-year old ruin into a modern designer home.
And now the unique property in the rolling landscapes of the Vale of Aylesbury in Buckinghamshire is for sale.
After costing £300,000 ($567,000) to rebuild - in addition to the £100,000 ($189,000) to buy the land - the renovated two-bedroom house is currently for sale for £850,000 ($1.6 million).
The couple behind the rebuild, who have had their second child since starting the project, put the home up for sale nine months after moving in because it is now too small for them.
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The renovation of Dinton Castle - which is also known as Dinton Folly - featured in an episode of Grand Designs in the UK.
In the programme, its presenter Kevin McCloud stands outside of the ruin at the start of the project, saying: "It may have the shape of a mini Tudor tower, but this mini-castle wasn't built for defence. It was, in fact, built 250 years ago to house a gentleman's fossil collection.
"Of course, now it has become something of a relic itself.
"It's a building that doesn't want to stand up anymore. It just wants to fall over in two big halves. Well, it's going to as its owners are going to try and repair it."
Architect Jimmy Fernandez and his wife Mimi revived the Grade-II listed property.
Jimmy and Mimi Fernandez with Grand Designs host Kevin McCloud. Photo Channel 4
Dinton Folly, before and after the renovation. Photo / Zoopla
Mr Fernandez said: "The project was more transformative than we had originally anticipated as we had our second child during the house build. We are now a happy and growing family of four in a two-bedroom house, so it is time for us to move on to the next stage in our lives.
"This is a beautiful and award-winning house, ideal for a couple looking to live in a unique place that is truly inspiring."
In the Grand Designs episode, Mr Fernandez explained: "I've always wanted to live in a castle and now I've got my chance."
They bought the land for £100,000 without any planning permission - and only obtained it on the basis that they would not extend the building.
The work began with digging the trenches for utilities services - power, water and sewerage - before starting on the crumbling stone walls and inside.
The lower floor has a compact kitchen, with an octagonal living room with a fireplace on the first floor and two bedrooms, each with a compact staircase, on the second floor.
There is a terrace roof with a seating area and a grand outdoor staircase leading up to the main entrance.
The couple started out with a £200,000 budget to do the building works, which proved to be too ambitious.
"Working on older buildings can be a slow and expensive business,' explained McCloud during the programme.
As well as expecting their second child during the project, they were evicted from their rental property just before Christmas last year and had to borrow £50,000 from Mr Fernandez's parents along the way.
Ms Fernandez was hopeful that the build would take just six months, meaning they could move in by June 2017 just before the birth.
However, after missing several moving deadlines, the Fernandez family finally moved into the property in March 2018.
Annabel Dixon, of property website Zoopla, said: "This is a beautifully-renovated property. It has been transformative for the young couple, who stand to double the value of the 250-year-old building in just a couple of years.
"Their blossoming family have now outgrown the folly, but it will make a wonderful new home for someone else who wants to be Lord or Lady of the Manor."
The project has received a design award for renovation from Aylesbury Vale District Council.
- Daily Mail
