Last summer, Balfour Beatty landed the contract to convert the stadium roof. It will now lead the remainder of the transformation works, including constructing the warm-up track, spectator and hospitality facilities and the external landscaping.
The stadium will be used for other sporting, cultural and community events. A new community athletics track will also be provided next to the main stadium funded by a London Marathon Trust grant.
Balfour Beatty expects to employ up to 400 people and will offer apprenticeships to 7% of its workforce.
Dennis Hone, chief executive of the Legacy Corporation, said: "This is another milestone in the development of Queen Elizabeth Olympic Park. We go into 2014 on track to deliver a world-class venue that, when it fully opens in 2016, can be used year-round to host a whole range of sporting, cultural and community events."
Andrew McNaughton, chief executive of Balfour Beatty, added: "We are delighted to be continuing our activity on Queen Elizabeth Olympic Park supporting the legacy commitment made as part of the London 2012 Olympic and Paralympic Games.
"During construction, our commitment to the use of local labour and the creation of apprenticeships will continue to benefit the local community and the wider industry."
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