
Car insurance premiums can vary significantly from one vehicle to another.
One of the factors insurers use when calculating premiums is the vehicle's insurance group.
Insurance groups help insurers assess the likely cost of insuring a vehicle based on factors such as repair costs, performance, security features, and parts availability.
This guide explains what insurance groups are, how they work, and why they can affect the cost of your car insurance.
This guide explains:
• What insurance groups are
• How vehicles are classified
• Why insurance groups affect premiums
• Factors used to determine a vehicle's group
• How to check your vehicle's insurance group
Understanding insurance groups can help you make more informed decisions when choosing a vehicle.
In the UK, most vehicles are assigned to an insurance group.
These groups help insurers estimate the potential risk and cost associated with insuring a particular vehicle.
Generally speaking:
• Lower groups tend to be cheaper to insure.
• Higher groups tend to be more expensive to insure.
• Vehicles are usually placed into groups ranging from:
Group 1 (typically lower insurance costs) to Group 50 (typically higher insurance costs)
Insurance groups provide insurers with a starting point when calculating premiums.
A vehicle in a lower insurance group may:
• Cost less to repair
• Have lower replacement parts costs
• Be less attractive to thieves
• Have lower performance levels
These factors can reduce insurance risk.
Several factors may be considered when assigning a vehicle to an insurance group.
Vehicle Value
More expensive vehicles often cost more to repair or replace.
Repair Costs
Vehicles with expensive parts or complex repairs may be assigned higher groups.
Performance
Vehicles with larger engines or higher performance levels may be considered higher risk.
Safety Features
Modern safety technology may help reduce accident severity and repair costs.
Security Features
Features such as:
• Immobilisers
• Alarms
• Tracking systems
may improve vehicle security.
Parts Availability
If replacement parts are difficult or expensive to obtain, insurance costs may increase.
Not necessarily.
Insurance groups are only one factor used by insurers.
Premiums may also depend on:
• Driver age
• Driving history
• No Claims Bonus
• Postcode
• Annual mileage
• Occupation
• Policy cover level
This is why two drivers can receive very different quotes for the same vehicle..
Insurance groups can often be found through:
• Vehicle review websites
• Insurance comparison services
• Manufacturer information
• Specialist insurance group databases
When considering a vehicle purchase, checking the insurance group beforehand may help avoid unexpected insurance costs.
Yes.
Young and newly qualified drivers are often more sensitive to insurance group differences.
Choosing a vehicle in a lower insurance group may help reduce premiums, although other factors will still be considered.
Many first-time drivers specifically look for vehicles with lower insurance groups to help manage costs.
Common Questions
What is the lowest insurance group?
Group 1 is generally considered the lowest insurance group.
What is the highest insurance group?
Group 50 is generally considered the highest insurance group.
Are lower insurance groups always cheaper?
Not always, but lower-group vehicles often attract lower insurance costs.
Can modifications affect insurance costs?
Yes.
Vehicle modifications may affect how insurers assess risk and could increase premiums.
Insurance groups can provide a useful indication of how expensive a vehicle may be to insure.
Checking a vehicle's insurance group before buying can help drivers avoid surprises and make more informed decisions when comparing vehicles.
Learn More
• What Affects Your Car Insurance Premium?
• How To Compare Car Insurance Safely Online
• What Is Excess On Car Insurance And How Does It Work?
• What Is No Claims Bonus And How Does It Work?
• Comprehensive vs Third-Party: What's the Difference?
• Named Drivers Explained: How They Affect Your Car Insurance
• How Can You Reduce Your Car Insurance Premium?
• How Does No Claims Protection Work?
• Can You Drive Other Cars On Your Insurance?
• What Insurance Group Is My Car?
• What Happens If You Make A Car Insurance Claim?
• How To Choose The Right Level Of Cover
If you choose to explore options further, you can access a comparison service via a trusted partner below.
You will be redirected to a partner website where you can enter your details and view available options.
We may receive compensation if you go on to purchase through one of our partners.
About Detective Scout
Detective Scout helps UK drivers compare vehicle insurance options through trusted comparison partners.
We provide simple guidance to help drivers make confident insurance decisions.
Detective Scout is an independent UK-based guidance website and not an insurance provider.
We are not an insurance provider and do not offer financial or insurance advice.
© 2026 Detective Scout. All rights reserved.