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Malaysian engineering, infrastructure and property group, Gamuda Berhad and London-based real estate investor, Castleforge have signed a main construction contract valued at over £250 million with global construction leader Multiplex for the redevelopment of 75 London Wall in the City of London.

The contract, signed on 6^th January 2026, marks a major milestone in the £1.2 billion landmark project, with Multiplex set to commence main construction at the beginning of 2026 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 over 50 per cent, is now expected to achieve practical completion in Q1 2028.

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.

Its successful delivery of Gamuda Berhad and Castleforge’s ambitious concept has demonstrated how adaptive reuse can deliver exceptional results in constrained environments.