Sisk Begins Construction on £300m Children’s Cancer Centre

The seven-storey, 5,400-square-metre prime retail and office development features lower ground, ground, and first-floor retail space, with five additional storeys dedicated to office and event space above.  Reports Contract Journal

A complex three-storey basement structure provides retailers with a lower ground floor and two further basement levels beneath.

McLaren’s top-down construction approach ensures the project remains on schedule in the busy heart of Mayfair.

To facilitate progress, McLaren will cast the central section of the ground floor slab, allowing core construction to proceed simultaneously with excavation and the casting of basement floor slabs and liner walls.

An extensive temporary works scheme incorporates 33-metre-deep, 1.2-metre-diameter piles and 15-metre steel plunge columns to support the cores and ground floor slab. This approach enables concurrent basement construction and core jump forming.

McLaren has collaborated closely with the City of Westminster to devise a logistics strategy and traffic management plan that minimises disruption to the local road network.

A large temporary ramp provides site-level access from Grafton Street for deliveries, as well as entry for the piling rig and crawler crane. Just-in-time deliveries optimise limited material storage space.

The Grade II-listed shopfront of Wartski jewellers at 14 Grafton Street has been carefully dismantled and will be reinstated in Barlow Place during a later phase of the redevelopment. The final mixed-use transformation of the site—spanning New Bond Street, Grafton Street, and Bruton Street—will introduce new homes, a hotel, premium office and retail spaces, as well as bars and restaurants.

The project will also deliver a new 19,000-square-metre clinical building, along with a new front entrance and welcome area for the entire hospital.

During the construction phase, Sisk will employ over 500 people on-site, hiring 37 apprentices and creating over 20 work placements for local students.

Sisk has digitally built the project in 4D before beginning on-site, and it is fully compliant with the Building Safety Act (BSA)—the first hospital in the UK to undergo the BSA process.

Construction is projected to be completed by late 2028.

The project will deliver a new 19,000 sq metre clinical building as well as a new front entrance and welcome area for entire hospital.

During the construction phase Sisk will employ over 500 people on site hiring 37 apprentices and creating over 20 work placements for local students.