25 Charterhouse Square

The redevelopment of 25 Charterhouse Square offers over 38,000ft² Category A open plan office accommodation and 5,000ft² of retail space, located adjacent to the new Crossrail Station at Farringdon East and overlooking the historic Charterhouse Square.

Project Details
  • Client


  • Architect

    Buckley Gray Yeoman

The original buildings which formed 23-28 Charterhouse Square were constructed during the 1960’s. The redevelopment required the demolition of the existing roof based plant rooms and the construction of an additional storey of office space to create a 6th floor, with a new localised plant space at roof level. The original mix of three cores were demolished and rationalised to create one central internal staircase complete with a remodelled entrance lobby and the creation of two new retail/restaurant units at ground floor.

Waterman was appointed by Helical to provide design services for the structural engineering for this prestigious building. Our engineers designed a new steel stability bracing system for the building, to replace the old internal brickwork return walls which were demolished. This new bracing system was founded adjacent to the new Crossrail tunnels which run under the building and required extensive discussion and approval with Crossrail. We used a light weight metal deck solution for the infill core areas at each level and for the new 6th floor. The roof was constructed using a combination of a lightweight metal deck concrete slabs and a cut timber roof. These lightweight structural solutions limited the overall strengthening works required to the original building while increasing the floor plates and allowing for an enlarged reception space. We worked closely with Buckley Gray Yeoman Architects to improve the efficiency of the scheme and with 21 Construction to provide additional value engineering on the project.