Sir John Soane's masterpiece, Tyringham Hall, goes on sale for £18m – nearly £15m more than it was bought for a decade ago

Property developer Anton Bilton certainly knows a good investment when he sees one.

The 48-year-old businessman snapped-up Grade I-listed Tyringham Hall for £2.5 million a decade ago - an absolute steal considering its recent guide price of £18 million through Savills Country Department.

Even if rumours that Bilton spent up to £10 million lovingly restoring the property are true, he still looks set to see a rather healthy return on his undeniably grand investment.

In recent years, the house has become known as a lavish party venue for the great and the good: Kazakh socialite Goga Ashkenazi notably celebrated her 30th birthday party at the house with a guest list that would get even the writers of Tatler's society pages excited.

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More recently, however, Bilton appears to have channelled his efforts into restoring the marvellous house to its original glory with the help of architect Ben Krauze under the watchful eye of English Heritage.

And the results speak for themselves. Beneath the sympathetic restoration is a property with all the luxury mod-consexpected of a 21-century owner.

As well as 25 bedrooms, nine principal bathrooms and four large reception rooms, the house also boasts a spa, games room, home cinema and a gym and is described by the agents as one of England's finest stately homes.

Built by famed architect Sir John Soane and completed in 1797, the stunning property is one of only a handful of country houses that has also been worked on by the celebrated 19th and 20th-century architect Sir Edwin Lutyens.

Crispin Holborow from Savills Country Department said: ‘Tryringham Hall combines some of the finest work of Soane and Lutyens, and as such could be labelled one of England's greatest architectural masterpieces. What's more, it's in exceptional condition having been beautifully restored.

‘It's enormous, but also remarkably compact. It has some wonderful formal rooms so can expand into a party home or contract into a family home.'

He added: ‘It's right at the top of English homes, an architectural jewel. It's architecturally and historically significant and this will attract buyers.'

Soane designed the neo-classical villa for banker and MP William Praed and it remained largely unchanged until it fell into the hands of Frederick Konig in the 1920s.

Konig commissioned Lutyens to create substantial formal gardens in the grounds as well as what is believed to be one of Europe's largest reflective pools.

During the war, Tyringham was transformed into a maternity home and was used variously as a weekend club and a naturopathic clinic before Anton Bilton bought it in 2001.

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