Who has the most expensive house in the world? The most expensive house in the world and the world’s biggest house is Buckingham Palace, owned by the King Charles III, in right of the British Crown with an estimated value of $4.9 billion. Check out our guide to the to see other fancy houses and luxury mansions. Who owns the $500 million dollar house? The $500 million dollar house is in California, United States. Originally marketed at $500 million by developer Nile Niami, the scandal-plagued Bel Air mansion was listed for $295 million in auction in January 2022, but sold for only $141 million in March 2022 to Richard Saghian, CEO of fast fashion company Fashion Nova. , Want to know the most expensive houses in the world? We've put together this list of the 10 most expensive homes of all time., Though spectacular, the Bellevue, WA, property is actually one of three properties on this week's most expensive homes list with an asking price of more than $70 million—with residences in Miami .