Work on the 39,000 square metre terminal is due to start in spring 2019 and is scheduled for completion in autumn 2020.
The terminal is the flagship project in the airport’s £600 million transformation which will support its future growth and pioneer the next generation of travel at London Stansted.
To mark the announcement, a fly-through animation has also been released today showing what the airport will look like following the transformation and how passengers will seamlessly flow through the airport.
Ken O’Toole, CEO of London Stansted, said: “I’m delighted to welcome Mace on board as we now focus on the most critical phase in the transformation of London Stansted.
"London Stansted’s transformation project is really gathering momentum. We’ve made fantastic progress so far, but it’s this year when the project starts to take-off when work begins on our arrivals terminal.
"The terminal is the most significant contract the airport has awarded as part of this project, and when complete it will provide a first-class, technology enabled, experience for our passengers.”
Gareth Lewis, Mace’s chief operating officer for construction, noted: “The new Arrivals terminal will completely transform Stansted and the experiences of the millions of people that arrive at the airport every year.
"We have a long heritage in the safe and successful delivery of major aviation projects across the world. This will be our first major construction project at Stansted since 2008, and we look forward to working closely with Manchester Airports Group to deliver the terminal.”
The arrivals terminal will include larger immigration and baggage reclaim areas, new retail facilities, a public forecourt and improved access for all onward transport options.
Once completed, Stansted will be the only UK airport operating dedicated arrivals and departures terminals.
The fly-through animation can be viewed here: Fly-through animation