The company will redevelop the six-storey building near Blackfriars Station at 1 Puddle Dock, London.
The project will create a new home for nearly 400 Network Rail Staff.
The 100,000 sq ft modernisation and refit includes Cat A fit-out for space to sub-let and fit-out of Network Rail's office areas to Cat B standard, along with new M&E installations, lift installations, windows and external doors.
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Working alongside Willmott Dixon are Scott Brownrigg, EPR Architects, Parsons Brinckerhoff and Watermans as the structural engineer.
Also working in partnership with the company is Sweett Group, who provided quantity surveying, project management, CDM-Designer and sustainability services.
Willmott Dixon Interiors chief operating officer Mike Hart said: "We're delighted to have been chosen by Network Rail to fit out their new central London offices.
"The location and fast-track nature of the project further highlights our expertise in delivering large-scale office refurbishment in busy urban sites that provide modern space for a variety of uses."
The project is set to be completed in summer 2016.
(LM)
