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In pictures | Mace’s resi scheme for billionaires reaches topping out
Cristina Lago Deputy Editor
Members of the delivery team signed the rafter beam at the topping-out ceremony (Credit: Caudwell)
Mace has marked the topping-out ceremony of the “world's most prestigious” residential address in London's Mayfair, built for the ultra-wealthy.
The £2bn 28,000 sq m 1 Mayfair scheme has a record waiting list of 600 'centi-millionaires' and billionaires interested in buying one of the luxury flats in the exclusive West End postcode. Prices start at £35m.
Mace is expected to complete the 1 Mayfair project in spring 2026 (Credit: Caudwell)
Mace has already completed the structure and basement. Construction included the creation of an extensive basement reaching 27m below ground at its deepest point to house a health spa featuring a 20m swimming pool, parking and other amenities.
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The topping outwas marked by the final steel rafter, one of 79 at roof level, being put into place on the top of the nine-storey main apartment building.
The next construction phases involve the finishing of the shell and core works and services, and the installation and crafting of the Portland stone facades.
The ultra-luxurious development has apartments starting at £35m (Credit: Caudwell)
1 Mayfair will have 24 'principal residences' of up to eight bedrooms, including lateral apartments, penthouses and townhouses, five small flats intended as secondary residences, and entertaining halls and lounges around a central garden.
The 23,279 pieces of hand-set Portland stone, steel and other reinforcements that will be used to clad and complete the building weigh more than 9,800 tonnes – the equivalent of 2,800 HGV lorries.
Caudwell's director Richard Bosson (left) and founder John Caudwell at the topping-out ceremony (Credit: Caudwell)
The classical architectural details of the facades and interiors are being created by specialist craftspeople and artisans from the UK, Italy, France and the US, who will also complete the internal fit-out.
The interior will feature a rotunda with hand-painted frescos, a grand reception room with a double-height ceiling and 5.5m high French windows overlooking the garden, as well as a Crystal Gallery created from over 1,264 hand-set cast glass pieces. The latter is “a contemporary take” on the Hall of Mirrors in the Palace of Versailles.
1 Mayfair will also have a library and a 'garden gallery' with seating areas opening onto the central courtyard garden. The building will be served with 15 passenger and goods and staff lifts, and two car lifts.
The January/February 2026 issue of Construction Management magazine is now available to read in digital format.
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