More than £100,000 of damage was caused to the Smiths of Ilkeston premises, in what managing director Chris Dixon called an act of ‘mindless stupidity’.
Mr Dixon told the Derby Telegraph he was called out by police to the showroom on Station Road in the small hours of Saturday morning.
He told the newspaper: ‘Four brand new cars have been written off, two have been extensively damaged, a barrier was destroyed and the front door smashed. A lamppost was also flattened.
‘It is fortunate that this happened in the early hours because at least there were no staff or customers about.’
Despite the inconvenience and hassle of clearing up and sorting out repairs, Mr Dixon said it was business as normal at the Vauxhall dealership.
Two men were arrested on suspicion of drink-driving after the incident.
Police said the car had left the road before careering onto the forecourt and overturning. One of the two men inside the vehicle suffered minor injuries.