TL;DR: house is built against an embankment, there's a road on top of the embankment, car left that road and drove off the embankment into the roof. literally a straightforward explanation.

Neighbours in Sittingbourne, Kent were woken by the sound of ‘two booms’ on Monday night as the Audi left the road, went through bushes and flew several feet through the air before smashing into the top floor of a terraced house down an embankment.