The insurance group system is the foundational tool UK insurers use to price the vehicle-specific component of a car insurance premium. Every passenger car sold in the UK is assigned a group from 1 to 50 by the Group Rating Panel - a body comprising Thatcham Research, the ABI, insurers and the motor trade. Group 1 represents the lowest insurance risk; Group 50 the highest. The assignment is based on a standardised set of criteria including the cost to repair or replace the car, parts availability and price, body structure and safety ratings, and the vehicle's security rating as assessed by Thatcham. For first-time drivers, young drivers in the 17-25 age band, and budget-conscious drivers of any age, choosing a Group 1-5 vehicle is one of the most structurally effective ways to reduce the vehicle component of an annual premium. However, it is important to note that the ABI data shows 17-20 year-olds average £1,539 per year even in lower-group vehicles - age and experience remain the dominant factors in that cohort. For the full market context, visit our car insurance hub or read our average car insurance cost guide. How Thatcham insurance groups workThatcham Research, based in Thatcham, Berkshire, is the motor industry's primary vehicle safety and security research centre. Its insurance group assessments are used by virtually all UK insurers as the baseline for the vehicle component of premium pricing. The assessment criteria are published by Thatcham and cover the following factors:
Cars typically found in insurance Groups 1-5The Group Rating Panel assigns groups to specific variants (engine size, trim level, transmission) rather than to a model as a whole. A 1.0-litre petrol manual entry-trim version of a model may sit in Group 3, while a 1.6-litre automatic premium-trim version of the same model sits in Group 12. The following vehicle types consistently include variants in Groups 1-5 based on Thatcham published group data:
Source: Thatcham Research insurance group database (thatcham.org/vehicle-data/insurance-groups/). Always verify the specific variant's group before purchase as groups are assigned per engine/trim combination. What this means for UK driversChoosing a Group 1-5 vehicle materially reduces the vehicle component of the annual premium. However, the insurance group is only one of many rating factors. The ABI Q4 2025 data confirms that a 17-20-year-old driver averages £1,539 per year, which reflects the statistical weight given to age and experience in pricing models - even Group 1 cars will attract a significant premium for inexperienced drivers in the first year or two of their licence. Additional steps that compound the benefit of choosing a low-group car include: accurate annual mileage declaration (the DfT records an average of around 7,100 miles per year, and declaring below the default insurer estimate where accurate can reduce premium), building a named-driver record on a family policy before taking out a separate policy, and considering a telematics (black box) policy which prices risk on actual driving behaviour rather than demographic proxies. For comparison, our most expensive cars to insure guide covers Groups 45-50. For how to compare policies effectively, see how to compare car insurance UK 2026. For the uninsured driving penalty (relevant if cover lapses on a previously-insured low-group car), see our uninsured driver penalties guide. Methodology - how we sourced this data
We refresh this article when Thatcham updates its published group database and when the ABI releases new quarterly premium tracker data. Frequently Asked QuestionsWhat is insurance Group 1 in the UK?Insurance Group 1 is the lowest insurance group assigned by the Group Rating Panel (Thatcham Research, ABI, insurers and motor traders). It represents the vehicle type with the lowest estimated insurance risk in the UK market - typically very small, low-powered, inexpensive cars with cheap and widely-available replacement parts and short repair times. A vehicle's group is assigned per variant (engine size, trim, transmission) and not by model name alone. Does a lower insurance group always mean a cheaper premium?A lower insurance group reduces the vehicle component of a premium, but it does not override the driver-risk factors that insurers also price. Age, postcode, driving history and years of no-claims bonus can each outweigh the group effect. A Group 1 car driven by a 17-year-old in a high-theft London postcode will still attract a substantially higher premium than a Group 8 car driven by a 45-year-old with 15 years of no-claims discount in a rural area. How do I check a car's insurance group before buying?Thatcham Research publishes the insurance group for every new and recent used car at thatcham.org/vehicle-data/insurance-groups/. You can search by make, model and variant. Always check the specific engine size and trim of the car you are considering, as different variants of the same model can span multiple groups. The DVLA vehicle enquiry service can confirm the registered specification of a specific vehicle. Are electric cars in a lower insurance group?Not necessarily. Battery electric vehicles (BEVs) are assessed using the same Thatcham criteria. While many small EVs have modest performance figures, the high cost of battery replacement and specialist repair requirements - particularly around high-voltage systems - can push the group higher than an equivalent petrol model. City EVs (e.g. some Peugeot e-208 variants) sit in moderate groups, while larger EVs frequently attract higher groups due to parts and repair costs.
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Cheapest Cars to Insure UK 2026: Insurance Group 1-5 Models Listed
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