The world’s most prestigious residential scheme, 1 Mayfair, is well on track for its 2026 completion following topping out by luxury developer Caudwell
It is the largest residential project in Mayfair, with a six-year construction programme that started in 2020.
The basement and structure of 1 Mayfair have now been completed. The next phases of construction include finishing the shell and core works and services and installing and crafting the Portland stone façades.
Caudwell has overseen the development’s construction, with architecture from the New York-based Robert A.M. Stern Architects, Mace acting as the construction manager, and PJ Carey responsible for the basement’s substructure and superstructure.
Completion of the £2 billion residential scheme is scheduled for Spring 2026.
The most exciting new development in Mayfair in over 300 years
The development is designed as the world’s most prestigious residential address, with apartment prices starting from £35 million.
The 300,000 sq. ft. luxury building is located by Park Lane and Hyde Park and occupies half an entire city block. Its façades front onto South Audley Street, Hill Street, and Waverton Street.
It includes 24 principal residences, lateral apartments, penthouses, and townhouses—offering up to eight bedrooms—five pieds-à-terre, entertaining halls, and lounges, all designed around a central garden.
The basement is extensive, reaching 27 metres below ground level at its deepest. It will house a health spa with a 20-metre swimming pool, parking, and other amenities.
Services will be offered alongside the health spa, including basement parking, 24-hour security, concierge, hotel-style services, and valet parking. The building will also feature 15 passenger and goods/staff lifts and two car lifts.
It has the world’s longest “waiting list” of centi-millionaires and billionaires. Over 600 registered, qualified UHNW people have registered an interest in buying a residence.
A topping-out ceremony was held
The final steel rafter, one of 79 at roof level, was placed on top of the nine-storey main apartment building, marking a topping-out event.
It was attended by Caudwell’s senior team, including the founder, John Caudwell, the company director, Richard Bosson, and CEO Uri Mizrahi, along with chief construction officer Kevan Buckley, as well as representatives of the other firms involved in the construction. They all signed the final rafter beam with their signatures.
John Caudwell, British businessman, philanthropist and founder of Caudwell, said: “The topping out marks the completion of the structure and basement of 1 Mayfair and underlines the advanced stage of the project’s construction. 1 Mayfair will deliver a legacy for London in the form of a landmark residential scheme that is timeless in terms of its architecture, design and build quality, setting a benchmark for London living and luxury design for centuries to come.”
Dan Lobitz, partner at RAMSA, said: “The design of 1 Mayfair has adapted Mayfair’s architectural traditions for the way people live today. The exterior façades reinterpret Georgian architectural precedents with finely carved Portland stone cladding, handcrafted metalwork and large timber windows that maximise views and natural light. Internal spaces draw inspiration from the classical layouts of historic English houses.
“Because 1 Mayfair occupies a large city block site we were able to create a building with a complex footprint, designed around a central garden, with large floor plates that afford the residences generously sized principal rooms.”
Handcrafted workmanship
The 23,279 pieces of hand-set Portland stone, steel and other reinforcements that will be used to clad and complete 1 Mayfair weigh over 9,800 tonnes. Designers, specialist craftspeople, and artisans from countries such as Britain, Italy, France, and America are creating the architectural details of the façades and interiors.
Features will include porticoed entrances, 648 timber windows, each handcrafted by English window makers Mumford & Wood, 21 sculptural balconies, colonnades and a tiered façade to the uppermost floors providing pavilions with high ceilings opening onto private rooftop terraces. Craftspeople will also be finishing the internal fit-out of the handcrafted interiors.
Including a rotunda featuring a ceiling with hand-painted frescos, a grand reception room with a double height ceiling and 18ft (5.5m) high French windows overlooking the garden, 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, The Library and a Garden Gallery, with seating areas opening directly onto the central courtyard garden.
