Admiralty Arch

Retaining much of the listed fabric, we sensitively cleaned, repaired and replaced missing parts of the external façade using archive information, with careful stonework detailing to new entrances.

Preserving the external silhouette, we designed a new roof to provide capacity for the proposed restaurant and roof terraces, as well as reinstating the building’s iconic flagpoles.

Including new below-ground facilities and amenity spaces. We undertook structural strengthening for increased loading conditions along with upgraded fire protection and detailed acoustic and vibration considerations.

Detailed temporary and permanent works enabled us to extend a cantilevered stone staircase in the north block down three storeys into the Ballroom.

By adapting the existing frame to support temporary and permanent loads, supporting tower cranes and site accommodation on the basement lid slab, and using curved stooled RC beams to support the façade over large openings, we minimised cost, embodied carbon and programme for the temporary works design.