One Berkeley Street

A 190-key, 5-star hotel with restaurant, bar, conference facilities, spa and gym. 1 Hotel Mayfair is the UK flagship for Starwood’s sustainable luxury hotel brand.

The hotel is part new-build and part conversion of an existing 1970 building, thereby making large savings of embodied energy, carbon and site waste. The two new-build floors accommodate guestroom suites with views overlooking the Ritz Hotel and Green Park. Works to the existing building presented a number of challenges including mixed construction types and disparate floor levels that called for clever solutions.

The hotel is part of a 240,000 sq. ft. mixed-use project by Crosstree Real Estate Partners that includes sustainably-designed offices and prime retail.

The scheme comprised extensive cut and carve demolition, including the removal of the top 2 floors, staircase demolition, Core D Demolition and slab demolition throughout.

Standalone demolition of a 2-storey extension to the building and a separate annexe building, undertaken within the existing courtyard to make way for new future structures.

Temporary works were minimised throughout the project by utilising bracing of the existing structure, rather than introducing new stability frames to the buildings. Similarly, extensive investigations were undertaken into the existing structure to verify its suitability to support the tower crane without propping.

Load tests were undertaken to enable the crane installation plus in excess of 45-t of kentledge situated at roof level, without any temporary works or propping. This provided a significant benefit and cost saving to the project, which prevented congested floor plates below.

800-t of new structural steelwork was installed around the project, 2 new floors were built where the former levels 7 and 8 previously existed and a new 7-storey extension adjacent to the existing structure.