A Cat C car is a vehicle that has been involved in an incident that resulted in an insurance claim significant enough for the car to be written off as being beyond economic repair. This means that the cost of repairing the car is greater than the vehicles value. However, a Cat C car isnt necessarily considered completely unroadworthy, and it can be safe to drive as long as its repaired safely and properly. The problem is that it can be hard to ascertain what type of repairs have been done and how well they were carried out, and insuring a Cat C car can be more expensive than one with a clean history. Its important to note that the Cat C classification was replaced by Category S as of 1 October 2017. If youre thinking of buying a Cat C car, you should be cautious about any vehicle thats classified as Cat C, as it can be hard to tell how competently these cars have been repaired.