Househunters looking for a £20million apartment require 24 hour concierges, underground parking as standard, with the option of separate staff quarters and even their own private swimming pool. We look at some of the most deluxe options on the market.

Villa Les Cedres is in Saint Jean Cap Ferrat, a refuge between Nice and Monaco for some of the world's richest people. Built in 1830, the villa was sold in 1924 to Alexandre Marnier Lapostolle, owner of the Grand Marnier liquor brand. It is now up for sale by its owner, drinks maker Campari and could fetch a believed world record £250m.

The public toilets were knocked down and replaced with two semi-detached homes, each costing almost £70,000 more than that average price of a home in Britain. The developer reportedly found needles, drug packages, vermin and asbestos on the site.

Phil Palmer and his partner Michael Butcher appeared on Grand Designs in October 2013 with a bold design for a contemporary farm home just outside of Newbury in Berkshire. They gave up their jobs in the capital to oversee the house build and start a new business, deciding on the new name of the Two Cocks Brewery and farmhouse.

A town on the south coast has been named as the most desirable place to live in the UK for young professionals - and surprisingly it's not trendy Brighton but its near neighbour. Hove was given the accolade for the second year in a row after continuing to attract aspiring workers.

For those brave enough to take the plunge, or just curious as to what they could get for the cost of a semi in the South East, here is our pick of six chateaux each with a price of less than £500,000. They include (clockwise from top left) an eight bedroom 20th century chateau for £374,676, a seven bed chateau in Upper Normandy for £333,424, and a twelve bedroom chateau in Normandy for £455,684. A five bedroom chateau between Toulouse and Bordeaux also costs £455,684, where as a seven bedroom chateau north east of La Rcohelle costs £410,41, and a five bedroom chateau east of La Rochelle costs £309,284.

Britain's most prized places to live by the sea have been named in our exclusive research by estate agents Savills - along with the up-and-coming coastal hotspots. They range from the most expensive locations - including top spot Salcombe, in Devon, pictured, - to more traditional seaside resorts full of nostalgic charm, such as Broadstairs, in Kent.

Everyone loves a good Grand Design - something that has helped to make it one of the most popular property shows on TV. Yet after pouring everything into designing and building their perfect homes, some owners have decided to move on, with three Grand Designs currently on the market. The owners of a seven-bedroom castle in Yorkshire (left), left the owners 'exhausted and scarily remortgaged up to the hilt', according to the show's presenter Kevin McCloud (inset). The purchase and redesign cost around £900,000 and the house is on sale for £1,650,000. A four-bedroom 'doughnut-shaped' property in Milton Keynes (top right), which was built in a couple's back garden for £400,000, is currently on the market for £1million. The couple behind the build, Peter Berkin and his wife Chard, were at odds at the end of the project. 'Peter is going to be happy here,' said Mrs Berkin, before adding: 'It has been positive because I am still here with him.' Meanwhile a six-bedroom house in Newport (bottom right) is on sale for £1,795,000 with the owners refusing to be drawn on how much they had spent on the build.

We choose our top 10 medieval homes - and there's something for everyone whether your budget is £600,000 or £6million.

They've struck gold on advertising linked to their internet channels and now high-profile YouTubers are buying multi-million properties to match their enviable lifestyles. Jim Chapman and his wife Tanya Burr are the latest to have bought a luxury home - with a private garden for their beloved dog Martha.