In 2026, one of the world’s most anticipated luxury residential developments is opening its doors in the heart of Mayfair — London’s “crown jewel”.
Bordered by Hyde Park, Green Park, and Buckingham Palace — Mayfair is one of the most expensive districts in the world. It is known for its stunning Georgian, Palladian, and Victorian architecture as well as its garden squares and historic sites, including The Royal Academy of the Arts based in Burlington House; Claridge’s Hotel, home to European royalty for over a century; and The Ritz, one of the most prestigious and best-known hotels in the world. Today, Mayfair is also home to multiple bespoke shops, Michelin-starred restaurants, and art galleries, as well as the famed tailors of Savile Row and the top two auction houses in the world Christie’s and Sotheby’s. Strolling through its streets and corridors, it is easy to see Mayfair represents a timeline of British excellence.
And this new luxury residential complex is predicted to be its pink diamond. It is called: 1 Mayfair.
1 Mayfair is a £2 billion residential block developed by John Caudwell of Cauldwell Property. Similar to the great families of the past — the Dukes of Northumberland who built Alnwick Castle, Warkworth Castle, and Prudhoe Castle, and the Earls of Westmorland & Warwick who built Warwick Castle, Raby Castle and Middleham Castle — Caudwell is on an odyssey to create landmarks that set an unprecedented standard (for the 21st century). He also wants to help restore the classical and opulent atmosphere of Mayfair.
For this project, Caudwell acquired a mismatched collection of buildings fronting South Audley Street, Hill Street, and Waverton Street. He then combined them into one, creating a residential building that spans approximately 300,000 square feet (27,870 square meters). And at the center of it all is: a grand 9-storey Palladian-style building, covered in pale Portland stone.
This central structure features porticoed entrances, timber windows, sculptural balconies and colonnades. It has a grand reception room with a double height ceiling and 18 feet high French windows overlooking a garden and a tiered façade to the uppermost floors, that open onto multiple private rooftop terraces. It also includes a port cochère and a central garden court with landscaped passageways.
1 Mayfair comprises 29 residences – 24 principal residences and 5 pieds-á-terre, ranging in size from 3,000 to 16,000 square feet. At the top of the building, there are two duplex penthouses and one triplex. These have their own private elevators and private rooftop terraces; offering views of Hyde Park, Big Ben, and St Paul’s Cathedral.
The largest two penthouses will each be approximately 15,000 square feet, while a townhouse in the development will be approximately 16,000 square feet.
It is reported that Caudwell obtained planning permission just before the city limited the size of new homes. According to The Guardian, in 2021, Westminster City Council passed a new policy (City Plan 2019-2040) that restricts new residential properties to a maximum of 200 square metres (approximately 2,150 square feet) in order to reduce super-size luxury apartments and prioritize family-sized housing. The areas covered by the new policy include Mayfair, Knightsbridge, and Belgravia. As a result, these residences at 1 Mayfair could be the last completely new (not renovated) mega-sized homes built in London for a long time.
The interiors at 1 Mayfair are designed by Juan Pablo (J.P.) Molyneux. They are grand and historical, featuring bespoke and unique artistry from around the world including Portland stone,
marble flooring, gold plating, and handcrafted metalwork. Artisans have also been hired to create a hand-painted ceiling fresco of Michelangelo’s maps of the heavens; friezes inspired by the Parthenon in Greece; a Crystal Gallery, created from over 1,264 hand-set cast glass pieces, providing a contemporary take on the Hall of Mirrors in the Palace of Versailles; and a Garden Gallery with seating areas opening directly onto the central courtyard garden.” The complex will also have ultra-luxurious interior flourishes — busts of important personalities from British history, George II styled furniture, and tables topped with a handcrafted marble. [John Caudwell]
1 Mayfair will also have a health spa with treatment rooms, a steam room, a sauna, and a 20-metre swimming pool; a gym with personal fitness coaching; a private library with a bespoke collection of 1,000+ books; a classically-designed courtyard garden complete with water features; a palatial reception room to welcome and entertain guests; and 24-hour in-residence dining offering private chefs and curated on-demand dining options.
Once opened, 1 Mayfair will be managed by the Dorchester Collection, a luxury hotel operator that owns 10 five-star luxury hotels, including The Dorchester (London), Le Meurice (Paris), Plaza Athénée (Paris), Principe di Savoia (Milan), The Beverly Hills Hotel (Beverly Hills), and The Lana (Dubai). The Dorchester Collection will offer residents of 1 Mayfair white-glove concierge and hotel-style services like valet parking, housekeeping, package handling, dry cleaning, event catering, grocery shopping, and professional flower arranging.
According to Caudwell, this £2 billion development is designed to be “the most desirable and valuable residence in London.” Prices for residences are estimated to start at around £35 million and top circa £200 million. You can learn more about this project on its website 1 Mayfair. You can see photographs at RAMSA. And you can view a short film in the marketing suite at 1 Mayfair.
BALISSANDE FINISHING SCHOOL 