Insurance Groups Explained: The 1 to 50 Scale and How to Use It
Every car sold in the UK is rated on a scale from 1 to 50 by the Association of British Insurers. The number on that scale is the single biggest predictor of how much your insurance will cost, ahead of your age, postcode and even your no claims history. Knowing how the scale works lets you cut a young driver premium by hundreds before you even start a quote.
#Who sets insurance groups
The Association of British Insurers and the motor trade body Thatcham Research jointly run the rating process. Every new car is tested against four core measures and assigned a number. Group 1 cars are the cheapest to insure, group 50 the most expensive. Most everyday family hatchbacks land between 5 and 20.
#What goes into the group rating
The rating is not just about engine size or top speed. Four main factors are weighed up.
- Damage and parts cost. How much it costs to repair the car after a typical bump, including bumpers, lights and panels.
- Repair time. Cars that take longer to fix push up courtesy car costs and rental claims.
- New car value. Higher value cars cost more to write off after a serious crash.
- Performance. Power to weight ratio, top speed and 0-60 time, because faster cars correlate with bigger claims.
- Security. Standard immobilisers, alarms, deadlocks and tracking systems can drop the rating by a group or two.
The result is a rating that reflects the lifetime cost of insuring that exact model and trim. A 1.0 litre Polo and a 2.0 litre TDI Polo can be five or more groups apart for the same body shape.
#The young driver sweet spot
For a 17 to 21 year old, the sweet spot is anything in groups 1 to 6. Beyond group 10 the premium climbs steeply, and once you hit group 20 you are looking at four-figure quotes even before any other factor. Sample group 1 to 5 cars include older Toyota Aygo, Hyundai i10, Skoda Citigo, Volkswagen up!, basic Ford Ka, Suzuki Alto and Fiat Panda.
#Cars that look cheap but are not
A few cars regularly catch new drivers out because the purchase price is low but the insurance group is high.
- Fiat 500 in 1.2 trim is group 6, but the Abarth and TwinAir versions jump well into the teens.
- Mini Cooper looks small but sits in groups 14 to 20 thanks to high parts costs.
- Vauxhall Corsa is fine in basic 1.0 form but the SRi or VXR variants leap up the scale.
- Ford Fiesta ST is group 28 plus, far higher than the standard Fiesta.
- Audi A1 starts in the high teens even on low engines because parts and labour cost more.
#Modifications and the group ladder
Modifications change the group rating in two ways. Some are baked into the trim level. Others are added by the owner and increase the premium even though the official group number does not change. Lowered suspension, aftermarket exhausts, performance chips and bigger alloys all push your quote up. Fitting an alarm or tracker can pull it down. Always declare modifications when buying insurance, because failing to declare them is a clear breach of the policy.
#Electric and hybrid cars
Electric cars often sit one to three groups higher than the petrol equivalent because batteries and traction motors are expensive to replace. A Renault Zoe sits in groups 13 to 15. A Nissan Leaf is similar. The MG4 starts at group 24. EVs are still cheaper to run overall, but the insurance line is real and worth checking before you buy.
#How to check a group before you buy
Before you visit a dealer or click Buy on a used car listing, run the registration through the AA, Confused or Compare the Market group lookup. Each free lookup tells you the group, the engine size, the trim and the security rating. If the seller will not share the registration, walk away. A registration plate that mysteriously cannot be checked is a sign of cloned plates or stolen cars.
#Tying the group choice to your overall plan
For a complete view of how to buy your first car cheaply, the young driver insurance UK guide walks through the full set of decisions. If you are still saving for the test itself, our driving test cost breakdown covers what comes before you even own a car. The wider stats section also shows how regional pass rates affect your timeline to getting on the road.
A clean choice in groups 1 to 6 is the difference between a £1,400 first year quote and a £3,200 one. The car you pick matters more than every postcode, age and gender variable combined for a new driver.
Frequently asked questions
How do I find the insurance group of a specific car?
Use the free lookup on AA, Confused or Compare the Market. Enter the registration to get the exact group, or the make and trim if you do not have a reg yet.
Is group 1 always the cheapest?
Almost always, but not for every driver. A group 4 car you actually fit into and use safely is better than a group 1 car you crash because it is too small or unfamiliar.
Do classic cars get group ratings?
No, most classics are insured separately on agreed value classic policies. The group system is mainly for cars sold in the last 30 years.
Why has the group rating on my car changed at renewal?
Thatcham revises ratings every year as repair data updates. A model can move up or down by one or two groups across its lifetime.
Are diesels in higher groups than petrols?
Often yes, because diesel parts and emissions kit cost more to repair. The diesel version of the same trim is usually one to three groups higher.
Can I insure a high group car as a young driver?
You can, but the premium can be eye watering. A group 25 car at 17 years old is regularly £4,000 plus. It is rarely worth doing for a first car.
Independent UK driving test analytics, reviewed against the latest DVSA quarterly statistical release.
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