The Low Carbon Workplace is a partnership between the Carbon Trust, Stanhope and fund manager Threadneedle which modernises old offices to provide new energy-efficient space.
Willmott Dixon has won the latest £10m contract to completely refit 63,000 sq ft of office space over five storeys at Grove House in Hammersmith.
Work will include new lifts, roof refurbishment, replacing M&E services and creating a new glazed atrium within the existing courtyard.
The company will refurbish the accommodation to a CAT A level, working with Bennett Architects, Akera Engineers and Arup.
Work starts this week and completion will be in 2013.