NEWLY-wed Kate Middleton has completed a trade-up in the property stakes which other brides can only dream about, said the property website Zoopla.co.uk.

Following the royal wedding, Prince William and Kate will make Clarence House in central London their first official home — with more than 40,000 square feet in SW1, it is worth more than £47million, says the website.

Although the young royals are the same age as the average first-time buyer, 29 years old, their first marital home is worth 343 times the average newly wed starter-home, which averages £137,000.

Windsor Castle, valued by Zoopla.co.uk at £171million, will be their weekend country retreat, with more than 1,000 rooms and more than 484,000 square feet of living space.

If and when the future King William and Queen Catherine finally take up permanent residence at Buckingham Palace, they will occupy the world's most valuable residential property - currently valued at more than £982million by Zoopla.co.uk.

Its 600 rooms include 19 state rooms, 52 bedrooms, a cinema, swimming pool, helipad and its own post office and police station.