Admiralty Arch

Much of the existing listed fabric has been retained, re-justified for the proposed loading conditions, upgrades to fire protection applied and careful consideration given to the acoustic and vibration requirements of the change of use. The external fabric has been sensitively cleaned and repaired and, where missing, new stonework detailing following the original designs, shown on the archive drawings have been installed.

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.