If you’re a young driver, regardless of whether or not your car has any modifications, your premiums will probably be higher than for people aged over 25 anyway. That’s because young drivers are statistically more likely to claim on their insurance, so that’s taken into account when issuing a quote.
Adding modifications usually makes premiums even more expensive. For example, our data shows that, for policyholders between 17-21 years old, the average cost for comprehensive insurance for cars with modifications is £1,184. But for policyholders over 50, it’s significantly less, at just £290.[2]