BMW Insurance Groups UK: Where Each Model Sits (1 to 50)
Insurance is one of the biggest recurring costs of running a BMW, and the insurance group is the headline number behind it. This guide explains how the UK 1 to 50 system works, shows where each BMW model family typically sits, and gives you practical levers to keep the premium down before and after you buy.
Quick answer
UK cars are rated from group 1 (cheapest) to group 50 (most expensive), set by the Group Rating Panel using Thatcham and ABI data. BMWs span almost the whole scale: a base 1 Series sits around groups 10 to 20, a mainstream 3 Series around 25 to 35, a 5 Series or X3 and X5 around 30 to 43, and the M3, M4 and M5 near the top at roughly 43 to 50. The group is set by the exact variant, trim, year and security, not the badge, so always confirm the figure for the specific registration before you buy.
How the UK insurance group system works
Every car sold in the UK is assigned an insurance group from 1 to 50. The ratings are produced by the Group Rating Panel, which draws on research from Thatcham Research (the motor insurers' automotive research centre) and the Association of British Insurers (ABI). Group 1 is the cheapest band to insure; group 50 is the most expensive. The higher the group, the more an insurer expects to pay out over the life of the policy, which feeds straight into your premium.
The panel weighs a handful of core factors when it sets a group:
- New-car price. A more valuable car costs more to replace after a total loss.
- Repair cost and parts prices. BMW parts and bodywork are dearer than mainstream brands, which lifts the group.
- Repair times. Complex construction and aluminium or carbon panels take longer to fix, and labour is charged by the hour.
- Performance. Power output and 0 to 62 mph acceleration correlate with crash frequency and severity.
- Security. Standard-fit alarms, immobilisers and tracking can pull a group back down; weak theft protection pushes it up.
One thing to keep in mind: the group is only one input into your quote. Your age, postcode, annual mileage, where the car is parked overnight, your claims history and your no-claims discount usually move the final premium far more than a couple of group points either way.
BMW insurance groups by model family
The table below shows indicative group ranges for the most common BMW model families on the UK used market. These are ranges, not exact per-variant figures, because the precise group depends on the exact engine, trim, model year and options. Treat them as a ballpark for comparison, then confirm the real figure for the specific car.
| Model family | Typical variants | Indicative group range | Notes |
|---|---|---|---|
| 1 Series | 116d, 118i, 118d, 120d | 10 to 20 | The cheapest BMW range to insure. M135i / M140i sit far higher. |
| 2 Series | 218i, 220d, 220i, Active Tourer | 14 to 28 | M240i and M2 jump well above this. |
| 3 Series | 320i, 320d, 330i, 330d | 25 to 35 | M Sport trim and 330i / 330d sit at the top of the band. |
| 4 Series | 420i, 420d, 430i, 440i | 28 to 40 | Coupe and convertible body styles tend to read higher than the saloon. |
| 5 Series | 520d, 530d, 530i, 540i | 30 to 40 | Value, weight and performance all push these up the scale. |
| X1 / X2 | sDrive18d, xDrive20d | 15 to 28 | The most affordable BMW SUVs to insure. |
| X3 / X4 | xDrive20d, xDrive30d, M40i | 30 to 43 | M40i variants sit near the top; diesels lower in the band. |
| X5 / X6 | xDrive30d, xDrive40d, M50d | 34 to 43 | High value plus performance keeps these firmly in the upper bands. |
| M3 / M4 | F80, F82, G80, G82 | 43 to 50 | Power, value, bespoke parts and theft appeal max out the scale. |
| M5 / X5 M | F90 M5, F95 X5 M | 48 to 50 | Among the most expensive BMWs to insure full stop. |
Ranges are indicative and for guidance only. The exact group depends on the precise variant, trim level, model year, options and security, and is set per-vehicle. Always confirm the group for the specific registration before you commit to a purchase or a quote.
What pushes a BMW into a higher group
Two BMWs with the same badge can sit several groups apart. These are the factors that lift the number:
Power and performance
More power and quicker acceleration correlate with higher accident frequency and severity, so a 330i reads higher than a 320i, and an M340i higher again. Within a model, the rule of thumb is simple: the more power, the higher the group. This is the single biggest lever when you are choosing between variants at purchase. A 330d vs 320d step or a 530d vs 520d step both move the group.
Repair and parts cost
BMWs are expensive to repair. Premium parts, specialist labour, complex electronics and aluminium or mixed-material body panels all raise the cost of putting a car right after a knock, and that repair bill feeds directly into the group. M cars compound this with bespoke brakes, suspension and bodywork that only fit that model.
Value and desirability
A higher replacement value means a bigger payout on a total loss. Performance models and well-specified examples therefore sit higher, and desirable cars also attract thieves.
Theft risk and keyless-entry relay attacks
M cars and high-spec models are actively targeted by thieves, which lifts the theft component of the rating. A specific modern concern is the relay attack on keyless entry (BMW Comfort Access): thieves use a pair of relay devices to amplify the key fob's signal from inside your home, fooling the car into thinking the key is present so they can unlock and drive away in seconds. Some thefts also go through the OBD diagnostic port to program a blank key. Insurers factor this in, and for some models the security expectations are stricter as a result.
Practical ways to reduce your premium
The insurance group is fixed once you choose the car, but plenty of levers remain in your control. The biggest one happens before you buy.
| Lever | What it does | Indicative cost |
|---|---|---|
| Choose a lower group at purchase | Picking a 320d over a 330i, or SE over M Sport, can drop several groups. This is the single most effective lever. | Free at point of choice |
| Telematics (black box) policy | Rewards careful, lower-mileage driving. Especially effective for younger drivers on otherwise high-group cars. | Often net saving |
| Secure overnight parking | A garage or driveway lowers theft and damage risk versus on-street parking. Declared honestly, it can cut the premium. | Free if available |
| OBD port lock | Blocks key-cloning through the diagnostic socket, a known BMW theft route. Cheap and effective deterrent. | £25 to £60 |
| Faraday pouch for the key | Blocks relay attacks on keyless entry by stopping the fob signal being amplified overnight. | £5 to £20 |
| Aftermarket Thatcham tracker | A category-approved tracker can reduce premiums on higher-value and M models, and some insurers require one. | £250 to £500 plus subscription |
| Protect your no-claims discount | The largest long-term discount on any policy. Worth protecting once you have several years built up. | Small annual add-on |
Beyond the table: pay annually rather than monthly to avoid finance interest, keep your declared mileage accurate but realistic, add an experienced named driver where it helps, and always compare quotes across both mainstream insurers and specialist BMW-friendly or performance-car brokers. The spread on identical cover for the same car can run into hundreds of pounds.
Where insurance fits in the total cost of ownership
Insurance is one line in a bigger picture. The same things that push a BMW into a high insurance group, more power, higher value and premium trim, also tend to raise its servicing, tyres, fuel and depreciation. A high-group M car is expensive across the board, while a base 1 Series or X1 diesel is comparatively gentle on every line.
When you are comparing two cars, run the full numbers, not just the headline group. A more reliable engine can save you more over three years than a couple of insurance group points ever will. Our most reliable BMW engines guide and the BMW running costs breakdown both help you weigh insurance against the rest. For a concrete worked example of two near-identical variants, the 320d vs 320i comparison shows how engine choice ripples through fuel, tax and insurance together.
Frequently asked questions
How are UK car insurance groups decided?
Insurance groups run from 1 to 50 and are set by the Group Rating Panel, which uses data from Thatcham Research and the Association of British Insurers (ABI). They weigh up factors like new-car price, repair cost and parts prices, repair times, performance (power and 0 to 62 mph), and the security fitted as standard. Group 1 is the cheapest to insure and group 50 the most expensive. The group is just one input; your own age, address, mileage, claims history and no-claims discount usually move the premium far more.
What insurance group is a BMW 3 Series?
It depends heavily on the exact variant and year, but as a rough guide a mainstream F30 or G20 3 Series such as a 320d or 320i tends to sit around groups 25 to 32, with a 330i or 330d pushing higher into the low 30s to mid 30s. M Sport trim, larger alloys and more power all nudge the group up. Always confirm the figure for the specific registration, because two cars wearing the same 320d badge can fall in different groups depending on build year and options.
Which BMW is cheapest to insure?
The smaller, lower-powered models. A 1 Series such as a 116d or 118i, or a front-wheel-drive 2 Series Active Tourer or X1 in a modest engine, typically lands in the lower BMW range (broadly groups 10 to 20). A base 116d in a low trim with secure parking and a clean licence is about as cheap as a modern BMW gets to insure. Avoid M Sport trim and big wheels if a low group is your priority.
Why are BMW M cars so expensive to insure?
M cars (M3, M4, M5, and the M-badged SUVs) combine high power, high values, costly bespoke parts and brakes, and strong theft desirability, so they sit near the very top of the scale, broadly groups 43 to 50. Performance pushes both the crash risk and the repair bill, and thieves actively target them. Expect specialist or performance-car insurers to be the most competitive, and budget for a meaningful premium even with a clean record.
Does a diesel or petrol BMW cost more to insure?
There is no fixed rule; the insurance group tracks the specific variant rather than the fuel type itself. In practice a 320d and a 320i sit in broadly similar groups, with the higher-output engine usually a group or two above its lower-output sibling. Diesels can carry slightly higher repair costs for some components, while petrols in higher states of tune carry more performance loading. Compare the two on the exact reg rather than assuming one fuel is always cheaper. See our 320d vs 320i comparison for the wider running-cost picture.
Does keyless entry make a BMW more expensive or risky to insure?
Keyless entry (BMW Comfort Access) is a known theft route via relay attacks, where thieves amplify the key fob signal from inside your home to unlock and start the car. Insurers are aware of this, and for some desirable models it can affect the premium or the security requirements. You can cut the risk cheaply: keep keys in a Faraday pouch or signal-blocking tin away from doors and windows, and many BMWs let you disable the fob's wireless signal by double-pressing the lock button. An OBD port lock also helps, since some thefts program a blank key through the diagnostic socket.
Will a bigger engine or M Sport trim change my insurance group?
Yes. Within a single model, more power lifts the group, and M Sport or M Performance trim usually adds a few groups over the equivalent SE or Sport because of larger brakes, bigger alloys, body kit, and higher repair costs after a knock. The jump from, say, a 320i to a 330i, or from SE to M Sport, can be several groups. If you are choosing between trims at purchase, check the group of each candidate variant before you commit, because it is a recurring annual cost you will pay every year you own the car.
How can I lower my BMW insurance premium?
Pick a lower-group variant at purchase, keep the car off-road or in a garage overnight, fit an OBD port lock and a Faraday pouch for keyless cars, and consider a telematics (black box) policy if you are a younger or lower-mileage driver. Building and protecting a no-claims discount, paying annually rather than monthly, and adding a named experienced driver can all help. Always compare quotes across mainstream and specialist BMW-friendly insurers, because the spread on the same car can be hundreds of pounds.
Does the insurance group affect road tax or running costs too?
No, the insurance group only affects your insurance premium. Road tax (VED) is set by CO2 emissions and list price, not by insurance group, and fuel and servicing are separate again. That said, the same things that push a BMW into a higher insurance group (more power, higher value, premium trim) also tend to raise its other running costs, so a high-group M car is usually expensive across the board. See our BMW running costs guide for the full picture.
Pricing up a specific BMW?
Before you commit, run a Bimmer.AI buyer report. It identifies the exact engine, flags the recalls that apply, and folds the engine-specific repair-cost exposure into a clear buy, negotiate or walk verdict.
Run a Bimmer.AI buyer report →Insurance group ranges on this page are indicative figures for general buyer guidance and are not quotes. Groups are set per-vehicle by the Group Rating Panel using Thatcham and ABI data, and change by exact variant, trim, model year, options and security. Always confirm the group and obtain a quote for the specific registration before buying. Bimmer.AI does not sell insurance.