Top 5 Biggest Houses in the World: Expensive Mansions

Discover the world's biggest houses, showcasing unparalleled luxury and architectural marvels. Explore lavish residences of the ultra-wealthy.

The allure of grandeur and luxury finds its embodiment in some of the world’s most lavish homes, where architectural finesse meets the pinnacle of opulence. From the serene landscapes of Brunei’s Istana Nurul Iman Palace to the bustling streets of Mumbai’s Antilia, these magnificent mansions not only serve as residences but also as symbols of unparalleled wealth and social status. Spanning continents and cultures, the biggest houses in the world offer a glimpse into the lives of the ultra-wealthy, featuring amenities that surpass even those of historic palaces like Buckingham Palace and estates akin to the French Riviera’s Villa Leopolda. In this article, we unveil the list of the biggest houses, where square footage translates into a realm of luxury, including wine cellars, infinity pools, and private theaters rivaling those of Beverly Hills.

1. Istana Nurul Iman Palace, Brunei (2.1 Million Square Feet)

Istana Nurul Iman Palace, Brunei (2.1 Million Square Feet)

The Istana Nurul Iman Palace, located in Brunei, is the official residence of the Sultan of Brunei and holds the distinction of being the largest residential palace in the world. This magnificent palace is a testament to Islamic architecture and showcases the grandeur of Brunei’s royal heritage.

Features and Amenities

  • The Istana Nurul Iman Palace spans over an impressive 2.15 million square feet, making it one of the largest palaces in the world.
  • The palace features 1,788 rooms, including state rooms, banquet hall, and a stunning mosque.
  • Luxurious amenities include air-conditioned stables, a polo field, and a 110-car garage.
  • The palace also houses a ceremonial hall, which can accommodate up to 5,000 guests.
Istana Nurul Iman Palace, Brunei (2.1 Million Square Feet)


As the official residence of the Sultan of Brunei and the largest residential palace globally, the Istana Nurul Iman’s value is incalculable. Given its vast size, luxurious amenities, and status as a national symbol, its value could easily be several billion dollars, though it’s unlikely ever to be sold.

2. Antilia, Mumbai, India (400,000 Square feet)

Antilia, the private residence of Indian business magnate Mukesh Ambani, is an architectural masterpiece that stands tall in the bustling city of Mumbai. With its unique design and opulent features, Antilia has become a symbol of modern luxury and grandeur.

Features and Amenities

  • Antilia is spread over a mind-boggling 400,000 square feet and rises 27 stories high, making it one of the largest private residences in the world.
  • Huge mansion includes a wide range of luxurious amenities, such as multiple swimming pools, a private movie theatre, a spa and fitness center, and multiple helipads.
  • The interior of Antilia is adorned with exquisite materials and finishes, including crystal chandeliers and rare works of art.
  • The mansion is equipped with a state-of-the-art security system, ensuring the utmost privacy for its residents.

Value: Billions

Mukesh Ambani’s Antilia is among the most expensive private residences in the world. Construction costs were reported to be around $1 billion. Considering its location in one of Mumbai’s prime areas, unique architectural design, and luxurious amenities, its current market value could be well over its construction costs, potentially reaching several billion dollars.

3. The Biltmore Estate, North Carolina, United States (178,926 square feet)

The Biltmore Estate, located in Asheville, North Carolina, is a sprawling mansion that holds the title for being the largest house in the United States. The estate was built by George Washington Vanderbilt II, a member of the prominent Vanderbilt family, in the late 19th century. With a staggering 178,926 square feet of living space, the Biltmore Estate is a true architectural gem.

Features and Amenities

  • The Biltmore Estate boasts 250 rooms, including 35 bedrooms, 43 bathrooms, and 65 fireplaces.
  • The mansion features an impressive 70,000-gallon indoor pool, a bowling alley, and a luxurious beauty salon.
  • Outdoor amenities include a stunning French formal garden, a tennis court, and a conservatory.
  • The estate also includes a winery, where guests can indulge in exquisite wines produced on-site in their luxury wine cellar.

Value: Several Hundred Millions

The Biltmore Estate, North Carolina, United States: As a historic landmark with unparalleled size in the U.S., the Biltmore Estate’s value is tricky to ascertain due to its unique nature and historical significance. However, considering its size, location, and status as a major tourist attraction, it wouldn’t be surprising if its value exceeded several hundred million dollars.

4. Fairfield Pond, The Hamptons, United States (110,000 square feet)

Fairfield Pond, located in The Hamptons, New York, is a sprawling estate that belongs to American businessman Ira Rennert. This mega mansion is a true testament to extravagance and boasts an array of luxurious features.

Features and Amenities

  • Fairfield Pond spans over 110,000 square feet, making it one of the largest residential properties in the United States.
  • The mansion features a staggering 29 bedrooms, 39 bathrooms, and a 91-foot long dining room.
  • Amenities include a basketball court, two bowling alleys, a squash court, and a home theater.
  • The estate also includes indoor swimming pools and multiple outdoor swimming pool, a guest house, and its own power plant.

Value: Over 200 Million

Ira Rennert’s Fairfield Pond is one of the most valuable properties in the U.S., with estimates often exceeding $200 million. Given its location in the Hamptons, extensive amenities, and sheer size, its value could range significantly higher, depending on the real estate market conditions.

5. The One, Bel Air, United States (105,000 square feet)

The One, located in the prestigious Bel Air neighborhood of Los Angeles, is a modern architectural marvel that takes luxury living to new heights. Developed by real estate developer Nile Niami, this mansion promises unparalleled luxury and sophistication.

Features and Amenities

  • The One boasts an impressive 105,000 square feet of living space, making it one of the largest modern houses in the world.
  • The mansion features 20 bedrooms, 30 bathrooms, and a stunning 5,500-square-foot master suite.
  • Amenities include a nightclub, a bowling alley, a 30-car garage, and a movie theater.
  • The estate also offers breathtaking views of the Los Angeles skyline and the Pacific Ocean.

Value: Over 295 Millon

This modern mansion was listed for sale with an asking price of $295 million in 2022. Given its luxurious amenities, prime location, and status as one of the most extravagant modern homes, its value is likely in line with or above the asking price, subject to market dynamics.


As we conclude our tour of the world’s most extravagant homes, from the sprawling estates of the Hamptons to the modern marvels of Bel Air, it’s clear that these properties are more than just residences; they are masterpieces of luxury living. Each mansion, with its vast square footage and unique amenities, from polo fields to a luxury massage parlor, represents the zenith of architectural grandeur and the lavish lifestyles of their owners. Whether it’s the historic opulence of the Biltmore Estate or the futuristic allure of The One, these homes stand as monuments to their owners’ wealth and ambition, rivaling even the most prestigious UNESCO World Heritage sites like the Palace of Versailles. As symbols of luxury and social status, these residences remind us that for some, homes are not just places to live but canvases to display their grandest dreams and achievements.