The British carmaker said that the DBX will be unveiled at the end of 2019 and assured that it will be equally at home in an urban environment as well as off-road.
Real-world testing of the DBX began sometime last year in the Welsh countryside.
Over the last few months, the DBX has been put through its paces in all environments from the Arctic Circle to the Nürburgring Nordschleife.
Forming part of the brand's continued investment in the UK, the site includes three 'super hangars' that have been transformed into a modern manufacturing facility for the British hand-built cars.
The St Athan facility is the company's second manufacturing where the DBX will be exclusively built and has managed to create 200 jobs thus far with another 550 expected in the future.
Another 3,000 jobs are also expected to be created across the supply chain and local businesses.
Last year, the manufacturing facility was also named as Aston Martin Lagonda’s “Home of Electrification” and the manufacturing home of the Lagonda brand.
“Our second luxury manufacturing facility is now producing cars and is ready to go into full production in H1 (first half of) 2020," said Aston Martin Lagonda president and group chief executive officer Andy Palmer.