Insurance companies use different write-off categories to describe the level of damage when a car is written off, but many drivers aren’t sure what these labels actually mean.
Should you avoid Cat S and Cat N cars? Can you repair and drive them? And what about Cat A or Cat B vehicles?
In this guide, we explain the meaning behind UK car insurance write-off categories and show you how to check if a vehicle has been written off using the registration number.
Table of contents
How to check if a car has a category by reg number?
To check if a car has been written off with category you’ll need to run a vehicle history check using the registration number.
CarAnalytics makes it easy:
- Enter the reg number in the VRM box.
- Choose our car write-off check to reveal if the vehicle was written off.
- Make the payment by providing your email ID.
- Your report will be sent as a link in which you will find write-off category marked by insurers.
These checks use data from the DVLA, MIAFTR, insurance companies, and salvage records. While DVLA doesn’t provide write-off info directly, a paid car check shows you if the car has ever been declared a total loss.
What are the insurance write-off categories for cars?
When a vehicle is badly damaged in an accident, insurers assess whether it’s safe or financially viable to repair. To standardise this, insurance assessors assign a write-off category to indicate the severity and type of damage.
Before October 2017, the categories were: Cat A, Cat B, Cat C, and Cat D, with Cat A being the most severe. However, these were replaced following an update by the Association of British Insurers (ABI) to better prioritise vehicle structural integrity over just repair costs.
The current categories used in the UK are: Cat A, Cat B, Cat S, and Cat N.
Cat A cars meaning
Category A represents the most severe write off classification, reserved for vehicles so badly damaged that neither the car nor its individual parts can be salvaged. According to Aviva’s motor insurance guidance, these vehicles must be crushed entirely, with no components—not even the wheels or battery permitted for resale.
Cat A status typically results from catastrophic incidents like severe fires, complete flooding, or high-speed collisions where structural integrity is entirely compromised. The vehicle identification number (VIN) is removed before crushing to prevent fraudulent attempts to transfer the identity to another vehicle. This category exists primarily as a safety measure, ensuring dangerously damaged vehicles never return to UK roads in any form.
Cat B cars meaning
Category B designates vehicles with extensive structural damage that must be crushed, though unlike Cat A, individual parts can be salvaged and resold. According to the Association of British Insurers’ Code of Practice, the vehicle’s body shell must be destroyed, but undamaged components like engines, transmissions, and electrical systems may be removed first.
Cat B vehicles cannot be repaired or returned to the road under any circumstances. The chassis receives permanent crushing, making these cars completely unroadworthy. However, salvage yards frequently sell recovered parts to mechanics and repair shops, meaning your replacement alternator or wing mirror could originate from a Cat B write-off. When buying used parts, it’s worth asking suppliers to check USA import records if sourcing components internationally, as different categorisation systems apply overseas.
The differentiation between Cat A and Cat B hinges on parts recovery—Cat B allows commercial salvage operations to extract value from intact components, while Cat A requires complete destruction. Consequently, Cat B vehicles often appear in breaker yards with doors, lights, or mechanical parts removed before they are finally crushed.
Cat S cars meaning
Category S identifies vehicles with structural damage that can be repaired and returned to the road, though the damage must have affected crucial elements like the chassis or frame.
Unlike Cat A and B vehicles, Cat S cars can legally be driven again once properly repaired and re-registered with the DVLA. However, a common pattern is that these vehicles carry permanent markers on their records, affecting resale value by 20-40% compared to clean equivalents. Before committing to any Cat S vehicle, you should check if the repairs meet safety standards through independent inspection.
What typically happens is that insurers assign Cat S when repair costs are economically viable but the structural compromise requires specialist expertise to restore properly.
Cat N cars meaning
Category N designates vehicles with non-structural damage that can be repaired and legally returned to the road. According to the ABI’s Code of Practice, Cat N applies when repair costs exceed the vehicle’s pre-accident value but the damage affects only cosmetic or replaceable components rather than structural elements.
Common Cat N damage includes electrical faults, interior fire damage, or body panel replacements. A vehicle might be categorized as Cat N after extensive paintwork, replacement of airbags, or damage to the infotainment system—issues that are expensive to fix but don’t compromise the vehicle’s structural integrity. When conducting a car category check by vin, Cat N vehicles represent the lowest risk among write-off categories since the chassis and frame remain undamaged.
However, Cat N vehicles must still be inspected before purchase to verify proper repairs. While these cars can be roadworthy, they typically sell for 20-40% below market value due to their insurance history marker, which persists even after professional restoration.
What causes a car to be written off? (Understanding insurance write-off conditions)
Insurance companies don’t just look at the damage — they follow a detailed process based on several technical and economic factors before declaring a vehicle a total loss or write-off.
Here are the common conditions that lead to a write-off decision:
- Excessive repair costs compared to the market value of the vehicle.
- Structural damage affecting chassis or crumple zones (typically Cat S).
- Non-structural but essential damage like airbags, electricals, or steering issues (often Cat N).
- Total loss due to fire or flood, where safety and restoration can’t be guaranteed.
- Theft recovery: if the car was stolen and found after payout, especially if damaged or stripped.
These are all recorded in the vehicle’s insurance history and made available through our comprehensive Condition/Write-Off Check Report.
Is it worth buying a car with a write-off category?
- If you learn that a vehicle you wish to purchase has been offered a Category S or Category N, you should carefully examine its history before making any payments.
- It is crucial to examine how the damage may have affected the car’s resale value and overall quality. Most of the time, Category S and Category N cars that have been professionally repaired can still be outstanding. Get a car inspection if possible to get an expert assess the car before your purchase to be on the safe side.
- You must back out of the deal, though, if your car category check indicates that the vehicle is classified as either Category A or Category B.
- The car will not be covered by insurance, and you won’t be able to lawfully drive it.
How does a category affect vehicle value?
Depending on your car’s category status, there will be differences in how you sell it and how much it is worth.
A Category S car, for instance, could potentially lose 20-40% of its original value compared to a non-category vehicle of the same year, make, and model, due to the damage it has sustained.
Our detailed 8-point car valuations are included in every comprehensive vehicle report, along with write-off and salvage history, giving you a complete picture of a vehicle’s true worth before you buy.
What differences exist in the selling process for category cars?
A car that is classified as Category S or N must have the write-off category declared. You cannot sell your car privately if it falls under Category A or B, but some parts from Category B vehicles might still be usable.
Authorised Treatment Facilities (ATFs) or scrap yards scrap cars classified as Category A and B.
Know more about Cat S & Cat N category cars with our extensinve guide!
Which car category is legal to sell?
You can sell a Cat N or Cat S car as long as you tell the buyer about its status. You must be clear about this, even if the car has been fixed up to how it was before the accident.
Are category cars harder to sell?
When a vehicle is in an accident and classified as a ‘Cat N’, its desirability among potential buyers decreases. This hesitation leads to a reduction in the car’s market value, making it less appealing than a comparable vehicle that hasn’t been in an accident.
When buying a used car, research is key. Cat N cars may be cheaper, but a history check ensures safety and value.
CarAnalytics offers car write-off checks along with the condition led to the write-off, finance records, and stolen vehicle reports to help you buy with confidence.
Start with a free car check & upgrade to a full car check, to know if the car you are trying to buy has been writen-off in the past.
Frequently asked questions
No, cars with a write-off category like Category A, B, S, or N usually aren’t covered by a manufacturer’s warranty. These are considered salvage vehicles, making the warranty invalid.
Yes, older cars are more likely to be written off for minor damage, simply because their market value is lower—even if repairs are possible.
Insurance companies pay the car’s current market value at the time it’s written off—not what you originally paid. If you have finance on the car, contact your lender to understand what’s still owed.
DVLA doesn’t show write-off info. In the UK, write-off checks aren’t free, services like CarAnalytics, you can find out if a car has been written off from just £4.99.
