Mega Mansions: A Look at the Biggest Homes on the Planet

From royal palaces to high-rise personal towers, the biggest houses in the world are more than homes—they’re architectural landmarks packed with luxury amenities and global prestige. Here’s a look at some of the largest and most extravagant residences ever built.

The Largest Residence in the World: Istana Nurul Iman, Brunei

With a total area of over 2 million square feet, Istana Nurul Iman is the largest residential palace in the world. It serves as both the royal residence and the administrative headquarters of the Brunei government. The palace includes 1,800 rooms, 257 bathrooms, a banquet hall, and numerous luxury features like five swimming pools, a helipad, and stables.

Buckingham Palace 

Located in London, Buckingham Palace is the official residence of the British monarch. Spanning 830,000 square feet, the palace contains 775 rooms, including 52 royal bedrooms, 78 bathrooms, 92 offices, and additional facilities such as a post office, cinema, and swimming pool

Antilia Mumbai India 

Antilia is a 27-floor private skyscraper owned by billionaire Mukesh Ambani. At 400,000 square feet, the home features helipads, a 50-seat theater, a snow room, and earthquake-resistant design. Designed by Perkins + Will, it accommodates a full-time staff of 600.

Biltmore Estate Asheville North Carolina

The Biltmore Estate remains the largest privately-owned home in the U.S. at nearly 179,000 sq ft. Built in 1895 for George Washington Vanderbilt II, it now functions as a museum and historic landmark.

Oheka Castle 

Constructed by financier Otto Hermann Kahn, Oheka Castle is a 109,000 sq ft estate in Long Island. Today, it serves as a luxury hotel with 32 suites.

Versailles Replica

An 85,000 sq ft lakefront mansion with 14 bedrooms, nine kitchens, and amenities like a ballroom and indoor pools.

Villa Leopolda

An 80,000 sq ft estate on 18 acres with 12 pools, 14 bathrooms, and a history tied to European royalty and billionaires.

Christopher Wren Mansion 

Built in the 1890s by the Vanderbilts, this 80,000 sq ft estate includes over 100 rooms and is now part of Fairleigh Dickinson University.

Fair Field House – Sagaponack, New York

A controversial 62,000 sq ft Hamptons estate with 21 bedrooms, 18 bathrooms, a private theater, and a 100-car garage.

Kensington & Chelsea

A six-story, 11,855 sq ft Queen Anne-style home with a private pool and seven reception rooms in an exclusive London neighborhood.

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