Multiplex has been awarded the main £250m construction contract for the redevelopment of 75 London Wall in the City of London.

The deal has been signed with Malaysian engineering, infrastructure and property group Gamuda Berhad and London-based real estate investor, Castleforge today (6 January).

The contract marks a major milestone in the £1.2bn project, with Multiplex now set to start main construction following extensive enabling and demolition works led by the Erith Group.

The redevelopment, which will preserve and strategically enhance the building’s core infrastructure while expanding capacity by more than 50%, is now expected to achieve practical completion in Q1 2028.

The development is in a prime location within a one-minute walk from Liverpool Street station and a five-minute walk from Moorgate and Bank stations.

It is taking a RetroFirst approach, which prioritises retrofit and reuse over demolition and rebuild, the project will be an exemplar in sustainable, low-carbon design with net zero carbon ambition.

Over the past year, under a pre-construction services agreement (PCSA), Gamuda and Castleforge have led the project’s planning and design, drawing on their expertise in sustainable and innovative development, with Multiplex providing specialist technical input and construction solutions to support the delivery.

The formal contract signing follows the successful completion of enabling works, which have set a new benchmark for efficiency and innovation in the City. The Erith Group's groundbreaking work on heavy demolition, structural strengthening, new foundations, and core extensions has progressed well throughout 2025, supported by three tower cranes installed earlier this year.

Upon completion, 75 London Wall will deliver more than 450,000 net square feet of office space, achieving top-tier sustainability certifications including BREEAM Outstanding, WELL Core Platinum' and NABERS UK 5 Star Design for Performance.

Designed by renowned London-based architects Orms, the scheme will provide premium amenities with enhanced daylight levels whilst maintaining a significant proportion of the existing building to minimise embodied carbon.

Niall Farmer, head of Gamuda Land United Kingdom, said: “This contract marks a significant milestone in Gamuda Land’s continued expansion in the United Kingdom and in our strategy to unlock long-term value from prime City of London assets. 75 London Wall represents a rare opportunity to reposition an existing building of scale into more than 450,000 square feet of future-ready, Grade A workspace, at a time when supply of top-tier, highly sustainable offices in the city remains structurally constrained.”

Callum Tuckett, managing director of Multiplex Global, added: “Delivering a project of this scale and complexity in the heart of the City requires not just construction expertise, but the ability to innovate under constrained site conditions whilst maintaining the highest sustainability standards.

“75 London Wall represents the future of sustainable commercial development, and we look forward to bringing our global expertise in complex urban construction to create a building that sets a new standard for the city. Our work with the project team over the past year has positioned us perfectly to hit the ground running and deliver this scheme to the highest standards.”