AHMM has lodged its proposals to upgrade the former Westminster headquarters of the Department for Business and Trade, boosting floorspace at the building by more than 30% in the process.

The practice first aired plans to rework the 1960s building, designed by the Ronald Fielding Partnership, in November last year. The last civil servants based at the site moved out earlier this year – and a five-year certificate of immunity from listing was secured in January.

Under AHMM’s proposals for building owner Mitsubishi Estate and developer Stanhope new facades, roof terraces and a new eastern wing will be added to the structure, which is a stone’s throw from Westminster Abbey.

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