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Which car insurance group is cheapest?

The insurance group your car belongs to can have a significant effect on the price you will pay for your insurance. It’s far from the only factor taken into account, as insurers will also consider details such as your age, where you live, your occupation and your driving record. 

So, which car insurance group is cheapest? A car that belongs to a lower insurance group will cost less to insure, as it is seen as lower risk and cheaper to replace or repair. Conversely, cars in the highest groups cost the most to insure. If you are looking for the cheapest insurance for young drivers then you are best to try and find a car in Group 1 and obtain insurance quotes for this vehicle.

How do the groups work?

Cars are assigned to one of 50 car insurance groups. Group 1 cars are the cheapest to insure, while cars in group 50 are the priciest. Cars in higher groups are more likely to cost insurance companies the most in claims, which is why they are the most expensive to insure.

How is the car’s group decided?

Thatcham Research is responsible for overseeing the Group Rating Panel, which places new cars into the appropriate group. When Thatcham assigns cars to groups, it does so on the basis of extensive research. Car insurance companies can use the same groups as Thatcham, or their own underwriters may decide how cars should be classified. Either way, the following factors are commonly used in deciding which group a car should be assigned to.


The more damage a car is likely to suffer in an accident, the more it will cost to repair. Therefore cars that generally sustain more damage will be placed into higher insurance groups.

Replacement parts

The parts most commonly used in car repairs are compared to calculate this. The price difference according to manufacturer can vary widely, so cheaper parts usually contribute to a vehicle being placed in a lower insurance group.

Repair cost

The Association of British Insurers estimates that repairs account for over half of the total amount car insurers pay out for claims each year, so repair costs have a huge impact on the grouping.

Repair time

Cars that take longer to repair cost insurance companies more money. A car with longer repair times is thus more likely to be placed in a higher insurance group.

New car price

The price of the car when bought brand new is an important factor, as it is generally a reliable guide to the likely costs of repair or replacement of the vehicle.


Cars that are capable of travelling at faster speeds, and that can accelerate more rapidly, are at a higher risk of an accident. The insurance group placing will thus reflect this increased risk.


A car with Autonomous Emergency Braking (AEB) is more likely than one without to be put into a lower insurance group. Such vehicles are more protected against low speed, front-to-rear collisions, and the resulting heavy impact that is expensive to repair.


Whiplash is an increasingly common reason for car insurance claims, and therefore effective in-car restraints that can help avoid whiplash injury will mean a car is more likely to be placed in a lower insurance group.


The alignment and structure of a vehicle’s bumpers can mean it qualifies for a lower or higher insurance group placing.


Cars fitted with security features such as immobilisers, high security locks and alarms are more likely to belong to a lower insurance group.

Is my car in a cheap insurance group?

Cars in group 1 are the cheapest to insure, while cars in group 50 are the most expensive. If you want to check your car’s insurance group, you can do so via ‘My Vehicle Search’ on Thatcham’s site, or via some price comparison sites. You could also check with your insurer. Cars in insurance group 1 include variants of:

Other related FAQs

Looking for more related content to this? We’ve picked a selection of related topics that you may find helpful

If you make a claim on your insurance policy, car insurance excess is the amount you will pay towards that claim. There are two types of car insurance excess – one compulsory, the other voluntary. The compulsory excess that your insurance company sets is the amount you must pay towards any repair done to your vehicle if you cause an accident. The voluntary excess is an optional amount on top of this – which means you’ll pay more towards repairs – but your annual premium price will come down in exchange.

Car insurance can go up for a number of reasons – especially if you’ve had an accident or received a fixed penalty in the last year. If you haven’t, you might find you’re just getting a poor deal when your deal automatically renews – so don’t be afraid to shop around until you’ve got a better price.

A no claims bonus is a discount that’s applied after your insurance premium is calculated by a car insurance provider. The discount doesn’t stop your premium from going up; instead, it simply gives you a percentage off your premium – and that discount grows with every claim-free motoring year you have.

Put simply, the reason why car insurance is high is because the cost of claims is high. As a result, insurers increase premiums to protect themselves and make a profit.

Car insurance is usually calculated based on the likelihood of you making a claim in the future. A range of factors are taken into consideration too, such as age, occupation, your driving history and the details of your vehicle.

Generally speaking, your car insurance covers your vehicle and damage that you may cause to other vehicles and motorists. Depending on the type of policy, it can also cover a range of additional extras, such as medical expenses and breakdown assistance

There are a number of reasons why car insurance quotes can change, such as if you’ve recently changed your address, or for reasons out of your control, like government tax increases.

If you make a claim on your car insurance, then yes, the cost of renewing your insurance will go up, unless some other significant factor works in your favour to bring it down.

Unfortunately, it’s impossible to accurately calculate how much your car insurance is going to cost without getting a range of quotes. As well as looking at national driving statistics, insurers will seek a huge amount of information about you and your vehicle before deciding on a personalised price.

Backdating car insurance cannot be done under any circumstances. Since it is a criminal offence to do so, you will not find any broker or insurance company who will be able to do this for you.