Balfour Beatty in Olympic stadium deal CONSTRUCTION group Balfour Beatty has won a contract worth more than £40 million to extend the roof on the London 2012 Olympic stadium. The work, which will double the size of the existing structure, will provide all-weather protection for sports spectators and improved acoustics for concert-goers. Work is due to commence on site in the autumn and is due for completion in the spring of 2015. A combination of solid and transparent roof coverings will be used to allow light to flow through. Balfour Beatty is already converting the London 2012 aquatics centre into a facility that will be used by communities. Balfour Beatty chief executive, Andrew McNaughton, said: "Once complete, the stadium will provide a first-class sporting and cultural facility for many generations to come."