Car Insurance Group Guide: How to Find Cheaper Premiums

Car Insurance Group Guide: How to Find Cheaper Premiums

Getting affordable car insurance in the UK is tough, especially for younger or new drivers. When buying a used car, people focus on the price, fuel costs, and road tax — only to get hit with a huge insurance quote at the last minute.

The trick to cheaper insurance is understanding the Thatcham Insurance Group rating. Pick a car in a lower group and you can slash your annual premium. Here's how it works and how to use it.

What Are Car Insurance Groups?

Every car in the UK is assigned an insurance group from Group 1 (cheapest) to Group 50 (most expensive).

A panel made up of the Association of British Insurers (ABI) and the Lloyds Market Association sets these groups, using research from Thatcham Research, the motor insurers' research centre.

The group rating is the baseline risk assessment. Your personal details — age, postcode, driving history — set the final price, but the group sets the starting point.

How is a Car's Insurance Group Decided?

Thatcham looks at several factors when assigning a group:

1. Damage and Parts Costs

The biggest factor. Thatcham simulates a 15km/h crash to assess structural damage. They then cost 23 common replacement parts (bumpers, wings, headlights). If parts are expensive or hard to find, the group goes up.

2. Repair Times

The longer a car takes to fix, the higher the labour bill. Complex cars that need specialist tools get grouped higher.

3. Performance

Speed equals risk. Cars with high top speeds and quick 0-60 times are statistically more likely to be involved in serious claims.

4. Safety Features

Cars with Autonomous Emergency Braking (AEB) or advanced collision avoidance systems are less likely to crash in the first place. That lowers the group.

5. Security

Factory-fitted alarms, immobilisers, and high-security door locks reduce theft risk. That lowers the insurance group.

The Letters After the Number

You might see a letter next to the group number (e.g., 10E, 14A, 22D). These relate to security:

• E (Exceeds): Security exceeds the minimum for that group, so it's been moved to a cheaper one (e.g., Group 10E was originally Group 11).
• A (Acceptable): Security meets the standard for that group.
• D (Doesn't Meet): Security falls short, so the car has been moved to a more expensive group.
• U (Unacceptable): Security is well below standard. Insurers may require an aftermarket alarm before they'll cover it.

How to Find Cars in Lower Insurance Groups

If you're a young driver, or just want to keep costs down, target Groups 1 to 5.

Characteristics of Low-Group Cars

• Small Engines: Typically 1.0-litre to 1.2-litre naturally aspirated.
• Low Value: Cheaper cars mean cheaper payouts if they're written off.
• Basic Trim Levels: Entry-level models lack expensive electronics and big alloys, making them cheaper to repair.
• High Safety Ratings: Small cars with 5-star Euro NCAP ratings and standard AEB do well.

Examples of Low-Group Cars

These cars (usually in base trim with the smallest engine) consistently sit in the lowest groups:

• Volkswagen Up!
• Kia Picanto
• Hyundai i10
• Skoda Citigo
• Toyota Aygo / Aygo X

The "Unexpected" High Group Trap

Always check the exact insurance group for the specific trim and engine of the car you're buying.

A basic 1.0-litre Ford Fiesta might be Group 4. But the Fiesta ST-Line with a higher-output EcoBoost engine and sporty body kit could jump to Group 15. The hot Fiesta ST pushes into the 20s or 30s.

Don't assume all versions of a model cost the same to insure. Always run a quote using the specific registration before you buy.

Conclusion

The insurance group system is a powerful tool. A car's repair costs, performance, and security directly decide its group. Understanding that lets you pick cars in lower bands and save hundreds of pounds a year on premiums. Check any registration to see its MOT history and specification before you buy — and browse our directory to compare insurance groups across different makes and models.