London's Heathrow Airport has selected CH2M, Arup, Turner & Townsend and MACE to assist the airport in its expansion plans.
The companies will construct the airport's third runway after it is approved by the UK Government.
CH2M Transportation Europe managing director James Rowntree said: "Improving access and capacity at high-quality international aviation hubs such as Heathrow is critical to London and the wider UK economy, ensuring that the country remains competitive on the global stage."
The four client partners were chosen after a competitive process to work in collaboration with Heathrow Airport Limited (HAL).
Arup Group chairman Gregory Hodkinson said: "We're delighted that Arup has been selected as a programme client partner (PCP).
"This strategic appointment to be a key member of the integrated client team builds on our 30 year relationship with Heathrow."
The expansion of the Heathrow Airport will help strengthen the UK economy by up to £211bn, while it is also expected to create 180,000 new jobs and 10,000 apprenticeships.
Turner & Townsend chief executive Vincent Clancy said: "We are ready to bring our programme management and commercial expertise from airports in over 20 countries to deliver the capacity and global connectivity the UK so urgently needs."
In July 2015, the Independent Airports Commission of the UK Government unanimously supported the airport expansion plan claiming that the project could be executed within environmental limits.
The expansion programme be commercially beneficial for Heathrow's shareholders as well as its operating airlines.
The client partners are responsible for ensuring that the project is delivered to meet the highest industry standards for planning, innovation and quality.
Image: Heathrow Airport has selected four client partners for its expansion project. Photo: courtesy of Heathrow.