Buckingham Palace – $1.3 Billion The palace is possessed by the British Royal family and has served as the official London residence of the UK's monarchs since 1837 and now it is also the official headquarters of the Monarch and officially the richest house in the world.

In 2026, the title for the richest (most expensive) house in the world is held by Buckingham Palace, which is owned by the reigning British monarch in right of the Crown. Valued at approximately $4.9 billion, it is considered a sovereign asset rather than a personal residence. However, the most expensive private residence in the world is Antilia, located in Mumbai, India. It is owned by Mukesh Ambani, the chairman of Reliance Industries and one of the world's wealthiest individuals. Valued at over $2 billion, the 27-story skyscraper-mansion features three helipads, a 168-car garage, a private theater, and a staff of over 600 people to maintain its massive 400,000-square-foot interior. Other ultra-expensive homes in 2026 include Villa Leopolda on the French Riviera (owned by the Safra family) and the massive "The One" mega-mansion in Bel-Air, California. While Buckingham Palace holds the highest valuation due to its historic and institutional significance, Ambani's Antilia remains the definitive symbol of modern private wealth and the world's most valuable home occupied by a single family.