What Is the Biggest House in the World
The biggest house in the world by floor area is Antilia, a private residence in Mumbai, India, owned by Mukesh Ambani, chairman of Reliance Industries. The 27-story skyscraper home covers about 400,000 square feet across multiple floors, with parking for 168 cars, three helipads, a health spa, ballroom, and several swimming pools. It is widely cited by Forbes and other outlets as the largest and most expensive private residence ever built.
Antilia is located on Altamount Road in Mumbai and was completed around 2010, with ongoing expansions and upgrades. The structure uses high-end materials, including custom-designed interiors, imported stone, and advanced building systems. It is designed to withstand seismic activity and extreme weather, with redundant power and water systems, according to reports from Forbes and architectural reviews.
Who Owns the Biggest House and How Much It Cost
The owner of the biggest house is Mukesh Ambani, whose family controls Reliance Industries, one of India's largest conglomerates. Reliance operates in petrochemicals, refining, oil, gas, retail, and digital services, and its annual revenues place it among the top global companies by Fortune and Forbes rankings.
Estimates of the construction cost of Antilia vary, but Forbes and other sources have reported figures above $2 billion, making it one of the most expensive private homes ever built. The cost includes land acquisition, structural engineering, interiors, smart-home technology, and extensive security infrastructure. The Ambani family has also invested in major global companies and ventures, as detailed in SEC filings and financial news reports.
Key Features, Rankings, and Comparisons
Size and Layout
Antilia has about 400,000 square feet of built-up space, far exceeding most palaces and estates worldwide. It includes private offices, a 50-seat theater, multiple guest floors, and dedicated staff quarters, all within a single tower footprint.
Energy and Sustainability Features
The home includes rainwater harvesting, solar panels, and backup power systems designed for long-term self-sufficiency. These features are highlighted in architectural and engineering case studies, including coverage by Forbes and specialized real estate journals.
Global Rankings
Antilia regularly appears at the top of lists of the most expensive and largest private homes, alongside properties such as Buckingham Palace and the Biltmore Estate in terms of historical scale, though it surpasses them in private residential square footage.
Security and Technology
The residence employs multi-layered security, biometric access controls, and advanced communications infrastructure, with design input from global engineering and security firms referenced in reports by Forbes and business news outlets.