This phase will see the formation of the basement structure, including new foundations, new drainage, upgrading of the existing vaults and waterproofing of the perimeter walls up to ground level. Once the basement slab is formed, the superstructure works will commence. Within this phase underpinning required to the existing structure will be completed along with the initial works required for the new UKPN substation to be formed.

Once the substructure is complete, the team will focus on the superstructure section. This section includes the completion of the ground floor concrete slab and the erection of the new reinforced concrete core, which will enable the commencement of the new steelwork frame. Most of the frame will be composed of reclaimed steelwork from another GPE project, making this a flagship project for the circular economy.

Once the main frame is complete, structural floors will be installed on the upper levels. At this stage, we will remove the original tower crane and position a new tower crane on the central core to enable the future installation of the façade. We will also install the main external hoist to facilitate the movement of materials and staff.

Completing the superstructure will enable the commencement of the façade works, which will vertically seal the building. The façade will consist of pre-fabricated panels finished in Portland Stone. These are manufactured off-site and will be installed progressively with pre-glazed windows. We will also progress with the new party wall elevation using pre-cast panels.

At the same time, we will be working on the roof structure and plant screen together with commencing and progressing all roofing waterproofing and finishes to the terraces, including safety balustrading. The mansard sections of the project will also progress once the main pre-cast panelization is complete.

At this stage, a scaffold will be installed along the building perimeter from level five to allow the formation of the new mansard and the installation and testing of the external zinc finishes and windows. We will also install the decorative panels and glazing in the reception entrance and retail units.

This phase relates to all works involving the building interiors, including erecting new internal walls, creating a raised access floor, joinery and carpentry, painting, tiling, installing lifts, staircases, balustrades and other floor finishes. We will remove the tower crane from the roof and commence the installation of the new mechanical and electrical services.

During this period, we will coordinate all work interfaces to achieve the design intent set within the brief.