Car Insurance Groups Explained for First-Time Buyers
UK car insurance groups run from 1 (cheapest to insure) to 50 (most expensive), and the number is set by the car, not by the driver.
Every car sold in the UK is assessed and placed in a group by Thatcham Research on behalf of the ABI (Association of British Insurers). Insurers then use that group as one of the main inputs when pricing a policy.
Most first-time buyers hear “insurance group” without ever being told what actually sets it, which makes it easy to assume a car’s price tag or badge tells you anything about the group. It doesn’t.
The detail
A car’s group is worked out from five things: how much it costs to repair after a typical low-speed bump, its new price when replacing a written-off car, its performance, its factory security (alarms, immobilisers), and how available and expensive its parts are. None of these relate to who is driving it.
Group placement has a large effect on what the same driver pays. For an 18-year-old with standard cover and no discounts, moving from group 1 to group 10 typically adds a few hundred pounds a year. Moving up into group 20 to 30, common for larger-engined hatchbacks and hot hatches, can more than double the group 1 premium. Your own figure will differ with your postcode, age and cover choices, but the shape of the curve, low groups costing meaningfully less, holds for almost every new driver.
Groups aren’t fixed for the life of a model, either. The ABI reviews and updates them as claims data changes, so the same nameplate registered three years apart can sit in different groups. Always check the group for the exact year and engine you’re looking at, not just the model name.
What this means for your first car
The group is the one part of the insurance equation you choose before you’ve spent a penny. Age, address and driving history are largely fixed for a new driver; the car isn’t.
Two cars that look almost identical in a listing, same age, same price, same badge, can sit ten or more groups apart once you check the exact engine and trim: the Fiesta and Polo model ranges each span 26+ groups.
That’s the part that’s easy to miss when you’re comparing cars on price alone. First Car Scout shows the group next to the monthly running cost for every car in a shortlist, so the trade-off is visible before you’ve fallen for a specific car rather than after.