Balfour Beatty will work with its in-house design team at Parsons Brinckerhoff to deliver the project when construction work starts in October.
Balfour Beatty successfully completed the first phase of T2B ahead of programme in November 2009.
The second phase of T2B will deliver a facility with 10 new aircraft gates in the area to the east of Terminal 1.
It will incorporate an underground link from the satellite to the main building of the new Terminal 2 development and a large baggage facility in the basement which will be subject to fit-out in the future.
Balfour Beatty Chief Executive, Ian Tyler, said: “We are delighted to have been awarded this work, providing an integrated service for one of our major UK customers.
“We have a strong track record in delivering complex projects for BAA at Heathrow, including the rail systems elements of Terminal 5 and Terminal 2B Phase 1.”
BAA Capital Director, Steven Morgan, said: “This contract represents another milestone in the modernisation of Heathrow Airport.
“I look forward to continuing our work with Balfour Beatty to ensure delivery on time, on budget, safely and to world-class levels of quality.”
In 2008, Balfour Beatty was appointed as one of BAA’s third generation framework construction suppliers.
Since that appointment, Balfour Beatty has successfully delivered projects for BAA at Heathrow, Edinburgh, Aberdeen, Stansted and Southampton airports.