A £110 million “giga mansion” is set to become one of London’s most expensive residential properties upon its completion at 17 Belgrave Square. This exceptional London Giga Mansion, developed by Fenton Whelan, is transforming the Grade I listed building into a sprawling 22,000-square-foot single-family residence, aiming to market it to global billionaires from early 2026. This ultra-luxury development underscores a continuing trend in the high-end London property market, which remains attractive to elite buyers, particularly those from Gulf nations, highlighting the emergence of the London Giga Mansion in the prime London real estate landscape. The development represents a significant achievement in the giga-prime market.
Historic Belgrave Square Undergoing Transformation for a London Giga Mansion
Belgrave Square, a distinguished 19th-century garden square in the heart of Belgravia, has long been a symbol of prestige and wealth in London. The Grade I listed building at Number 17 has a rich history, having previously served as the residence for the Sassoon family, a prominent Baghdadi financier dynasty, and also housed Members of Parliament. More recently, it was the headquarters for the Royal College of Psychiatrists before standing vacant for several years. The building, originally constructed in the 1840s, is now undergoing a meticulous redevelopment to reinstate it as a singular, magnificent family home. Fenton Whelan, a developer known for high-end projects in the capital, is spearheading this ambitious undertaking, creating a landmark London Giga Mansion. The project is expected to be completed by the summer of 2026.
The “Giga Mansion” Concept: Redefining Ultra-Luxury Living in a London Giga Mansion
The £110 million valuation places this property firmly in the “giga-prime” market, transcending the super-prime bracket. The redevelopment aims to create a residence of unparalleled scale and luxury, spanning 22,000 square feet. Such transformations of historical buildings into modern mega-mansions are a growing feature in London’s ultra-luxury property landscape, with this London Giga Mansion being a prime example. While specific details of the interior are yet to be fully revealed, such ambitious projects often include extensive amenities like private cinemas, swimming pools, spas, staff accommodation, and triple garages. The challenge in redeveloping a Grade I listed building like this London Giga Mansion lies in balancing the preservation of historical integrity with the incorporation of modern conveniences, a task requiring sensitive design and specialist craftsmanship. This Fenton Whelan development sets a new standard.
London’s Enduring Appeal to Global Elite and the Rise of London Billionaire Homes
The Belgravia property market continues to be one of London’s most sought-after locations for high-net-worth individuals. Its prestigious address, elegant Georgian architecture, and proximity to landmarks like Buckingham Palace and Hyde Park contribute to its enduring appeal. Despite global economic fluctuations, the area maintains stable demand, drawing significant interest from international buyers, particularly from the Middle East, fueling the market for London billionaire homes.
Fenton Whelan co-founder Sanjay Sharma notes that London’s top-end market remains highly attractive to the world’s elite, reflecting a conviction that the city will always be a desirable destination for global billionaires seeking properties like the London Giga Mansion. This sentiment is echoed in market analysis predicting continued strength in the ultra-luxury segment, with buyers from Gulf nations like the UAE and Saudi Arabia driving sales of properties above £15 million in recent months, often in the realm of London billionaire homes.
Market Trends and Future Outlook for Prime London Real Estate
The London real estate market, particularly in prime central areas like Belgravia, is showing signs of recovery and renewed optimism for 2026. After a period of price correction, forecasts suggest modest price growth, with some analysts predicting increases of 3-5% for prime central London properties in 2026. The ongoing attractiveness of Belgravia, coupled with its limited housing supply, points towards continued property value appreciation, making this Belgrave Square mansion a significant investment. This is a prime example of London luxury property.
The trend of transforming historic buildings into expansive, ultra-luxury residences like the one at 17 Belgrave Square highlights the unique demand within this market segment for the giga-prime market. These developments cater to a specific demographic of global ultra-high-net-worth individuals seeking not just a home, but a statement of prestige and exclusivity. The news from Belgrave Square is a significant piece of real estate news, reflecting the enduring allure of London as a global hub for wealth and luxury and the growing demand for Ultra luxury real estate. The city’s unique blend of history, culture, and unparalleled amenities continues to position it as a prime destination for those investing in the highest echelons of the property market, shaping the narrative of London society and the demand for projects akin to this London Giga Mansion, a testament to Historic property redevelopment.
