They say home is wherever you hang your hat. If you are the Sultan of Brunei, you could hang a few thousand and still have closet space to spare.

Home is where the heart is. In this case, the heart comes with 1,788 rooms, 257 bathrooms, five swimming pools, and a garage for 110 cars. Welcome to Istana Nurul Iman—the official residence of Hassanal Bolkiah, the Sultan of Brunei, and, by most reasonable standards, the world’s most ambitious answer to the question, “How big should a house be?”

The Quick Stats (Bring a Map and Comfortable Shoes)

• Finished: 1984
• Reported cost: about $1.4 billion USD
• Location: Just outside Bandar Seri Begawan, Brunei
• Total floorspace: 2,152,782 sq ft (≈ 200,000 m²)—roughly 49.4 acres of interior wandering
• Levels: 17, including basements and sub-basements
• Amenities: Banquet hall for 5,000, 5 pools, air-conditioned stables for 200 polo ponies, and a helipad

Touring every room at a brisk one minute apiece would still take you nearly 30 hours of nonstop sightseeing. That assumes no detours for snacks, selfies, or the inevitable moment of, “Wait—have we been down this gold-handled hallway already?”

Luxury With the Volume Turned Up

The palace is decorated as if the word “opulent” got a promotion. There are solid-gold door handles, commissioned art by world-renowned artists, and the sort of architectural flourish that makes other palaces scoot politely to one side on the red carpet. One reported purchase—a Renoir—ran about $70 million, which is the kind of impulse buy that suggests the gift shop is very persuasive.

What Counts as a “Palace,” Anyway?

Record-keepers use an exacting standard. To rank as a “royal palace,” the building must have been constructed to serve as a royal residence, and only the combined indoor floorspace is tallied. That is why Romania’s Palace of the Parliament—a titan at roughly 3.93 million sq ft—does not qualify; it is a governmental building, not a royal residence. Turkey’s Ak Saray is approximately comparable in size to Istana Nurul Iman, yet it primarily serves as a working office, so it steps out of this contest as well, leaving Istana Nural Iman to be recognized by Guinness World Records as the world’s largest residential palace.

How Other Iconic Palaces Stack Up

Palace	Location	Approx. Sq Ft	Rooms
Istana Nurul Iman	Brunei	2,152,782	1,788
Apostolic Palace	Vatican City	1,743,753	1,000+
Royal Palace of Madrid	Spain	1,450,000	3,418
Falaknuma Palace	India	1,011,495	60 rooms, 22 halls
Buckingham Palace	UK	830,000	775
Palace of Versailles	France	721,182	~700
Royal Palace of Stockholm	Sweden	658,859	1,430
Windsor Castle	UK	590,239	~1,000
Grand Kremlin Palace	Russia	259,410	700+

So, Is It a House or a City With Better Landscaping?

Istana Nurul Iman functions as both a royal residence and a working seat for state ceremonies. The banquet hall alone can seat a medium-sized concert audience. The stables enjoy air-conditioning that many apartments can only dream about. The swimming pools suggest a lifelong commitment to both leisure and chlorine.

The Sultan has been listed among the world’s wealthiest royals at various points, which helps explain why the fixtures are literally golden and the art collection could moonlight as a museum. It is not just large. It is large with intent—a place built to impress visiting dignitaries and make logistics managers quietly weep with joy.

Planning Your Imaginary Visit

The palace opens for public tours on select occasions and for major holidays, which means your best shot at seeing the interior involves good timing and even better luck. The exterior, however, offers plenty of opportunities for gawking from across the river. Photographs capture only a fraction of the scale. The rest you feel in your knees as you contemplate the square footage.

Read More Palace-Sized Fun

• Buckingham Palace: Where Even the 78 Bathrooms Probably Have Crown Molding
• Apostolic Palace and other Vatican curiosities
• Versailles (because sometimes a garden needs its own army)

Bottom line: Istana Nurul Iman is more than a palace. It is a thesis statement in marble and gold, proving that “home sweet home” scales surprisingly well when your hobbies include statecraft, polo, and owning more bathrooms than most neighborhoods.

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