Istana Nurul Iman: The World's Largest Palace Is Also a Working Government

The Istana Nurul Iman — Palace of the Light of Faith — is the world’s largest residential palace by floor area, and it is not particularly close. At approximately 2.2 million square feet, it covers roughly half the footprint of Vatican City. It has 1,788 rooms, 257 bathrooms, 44 stairwells, 18 elevators, and 50,000 light bulbs. Its banquet hall seats 5,000 guests simultaneously.

Its stables house 200 polo horses, and those stables are air-conditioned. It cost $20 billion to build — an amount that represents, by most estimates, roughly half of Sultan Hassanal Bolkiah’s personal fortune.

Scale and Design

Leandro V. Locsin was the Philippines’ most prominent architect of the 20th century — responsible for the Cultural Center of the Philippines complex in Manila and a series of institutional buildings that defined the Marcos-era built environment. His appointment to design Brunei’s royal palace was a signal that Sultan Hassanal Bolkiah was not interested in a generic statement of autocratic grandeur. Locsin designed for the tropics; his buildings worked with climate, light, and the specific material culture of Southeast Asia rather than simply importing European or American institutional templates.

The Istana’s design synthesizes Islamic architectural references — pointed arches, geometric patterning, the prominence of the two internal mosques — with the broad horizontal massing and covered walkway systems Locsin had developed through his Philippine work. The roof forms reference traditional Malay architecture, specifically the curved rooflines associated with royal and sacred buildings in the Malay archipelago. The result is a building that reads as specific to its location and culture rather than as a generic monument to wealth, which is a harder thing to achieve than it sounds.

The 2.2 million square feet is distributed across a campus rather than a single tower block. Covered walkways connect the residential, ceremonial, administrative, and service sections. The five swimming pools are distributed across the grounds. The underground garage infrastructure — 110 spaces directly below the palace — accommodates vehicles that, in many cases, cost more than the average Bruneian household earns in several years.

The Vehicle Collection

The Sultan’s car collection is a subject that appears in almost every account of the Istana, and for good reason: it is approximately as large as a mid-sized museum’s entire holdings, and substantially more expensive. The approximately 17,000 vehicles include roughly 500 Rolls-Royces, 200 Bugattis, five McLaren F1 road cars — which were among the most valuable automobiles in the world at the time of acquisition — and a Rolls-Royce finished in gold.

The total estimated value of the collection is around $6 billion, which is itself roughly a third of the palace’s construction cost. This does not account for depreciation, maintenance, or the specialized storage and service infrastructure required to keep 17,000 vehicles operational across a country the size of a medium American county.

Whether the Sultan drives any of them regularly is a question Bruneian protocol does not address publicly.

The Art and Interior

The interior art collection includes works by Renoir, Picasso, and Monet — paintings acquired during a period when Sultan Hassanal Bolkiah’s personal spending on art, real estate, and collectibles made him a significant force in multiple auction markets simultaneously. The gold-woven carpets are custom fabrications; the diamond fixtures throughout the palace are not symbolic but functional — they appear in door hardware, chandeliers, and decorative elements at a density that makes cataloguing them difficult.

The 564 crystal chandeliers are among the most-cited individual statistics about the palace, and they are relevant not just as a measure of conspicuous consumption but as a practical engineering consideration. Hanging, maintaining, and illuminating 564 crystal chandeliers in a tropical climate — where humidity and heat affect both the fixtures and the wiring — requires ongoing specialized maintenance work that employs a dedicated staff.

Government in a Palace

What distinguishes Istana Nurul Iman from the palaces of European monarchies and Middle Eastern royal families is that it is not primarily a symbolic or ceremonial residence. It is the actual seat of government of Brunei Darussalam. Cabinet meetings happen here. State business is conducted in its formal rooms. The Sultan of Brunei holds the offices of Prime Minister, Minister of Finance, and Minister of Defence simultaneously, and all of those functions operate from this building.

The palace is closed to the public 362 days of the year. During Hari Raya (end of Ramadan), the Sultan opens the gates for a public reception — and over 100,000 people enter over the course of several days. It is one of the only times the scale of the building becomes visible to Bruneian citizens from the inside.

Sources

• Sumalindong, Augusto F. Leandro V. Locsin: Architect. Manila: Tukod Foundation, 1997.
• Brunei Ministry of Finance and Economy — national accounts and sovereign wealth fund documentation.
• Forbes and Bloomberg coverage of Sultan Hassanal Bolkiah’s personal wealth, vehicle collection, and palace holdings, 2000–2024.