Write Off Checks
Cat A, Cat B, Cat S And Cat N Explained UK: Complete Write Off Category Guide
13 min read
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CarVerified Team
Understand UK car insurance write off categories including Cat A, Cat B, Cat S and Cat N. Learn what each category means, whether repaired vehicles can return to the road and what buyers should check before purchasing.
When buying a used car, you may come across vehicles described as:
•
Cat A
•
Cat B
•
Cat S
•
Cat N
These terms refer to insurance write off categories.
A vehicle receives a write off category when an insurance company decides that repairing the damage is not financially practical or the vehicle has suffered significant damage.
Understanding these categories is important because a written off vehicle may have a different value, repair history and resale potential compared with a vehicle that has never been damaged.
Before buying a repaired vehicle, buyers should understand exactly what each category means.
What Is A Write Off Category?
A write off category is a classification used by insurance companies to describe the level and type of damage a vehicle has suffered.
A vehicle may be written off because of:
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Road accidents
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Flood damage
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Fire damage
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Theft recovery
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Serious mechanical damage
Not every written off vehicle is unsafe.
Some vehicles can be repaired and legally returned to the road.
However, the category gives buyers important information about the vehicle’s past.
Cat A Explained UK
What Is A Cat A Car?
Category A is the most severe write off category.
Cat A vehicles are considered beyond repair.
These vehicles cannot legally return to the road.
They must be completely destroyed.
Cat A vehicles usually have:
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Severe accident damage
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Major fire damage
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Extreme structural damage
No parts from a Cat A vehicle should normally be reused.
Cat B Explained UK
What Is A Cat B Car?
Category B vehicles have significant damage where the vehicle body cannot be reused.
However, some parts may be recovered and reused.
Cat B vehicles:
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Cannot return to the road
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Cannot be repaired for normal use
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May have usable components removed
Examples of reusable parts may include:
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Engine components
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Interior parts
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Mechanical components
The vehicle shell itself must be destroyed.
Cat S Explained UK
What Is A Cat S Car?
Category S means the vehicle has suffered structural damage.
The vehicle can be repaired and returned to the road if repairs are completed correctly.
Structural damage may involve:
•
Chassis areas
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Vehicle frame
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Structural body components
A Cat S vehicle requires careful checking because poor repairs can affect safety.
Should You Buy A Cat S Car?
A Cat S car is not automatically a bad purchase.
A repaired Cat S vehicle may provide good value if:
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Repairs were completed professionally
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Documentation is available
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Vehicle condition is confirmed
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Price reflects the history
Always inspect the vehicle before buying.
Cat N Explained UK
What Is A Cat N Car?
Category N means the vehicle has suffered non-structural damage.
The damage does not affect the main structural frame.
Examples include:
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Electrical damage
•
Cosmetic damage
•
Interior damage
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Bolt-on component damage
Cat N vehicles can often be repaired and returned to the road.
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Should You Buy A Cat N Car?
A Cat N vehicle can be a good option if it has been repaired properly.
However, buyers should still check:
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Repair quality
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Vehicle history
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Mileage records
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MOT history
Cat S Vs Cat N Difference
The main difference between Cat S and Cat N is the type of damage.
Cat S
Structural damage.
Examples:
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Chassis damage
•
Frame damage
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Structural repairs
Cat N
Non-structural damage.
Examples:
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Electrical faults
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Cosmetic damage
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Interior repairs
Cat S generally requires more attention because structural repairs are involved.
Old Write Off Categories: Cat C And Cat D
Before 2017, vehicles used different categories.
These included:
Cat C
Vehicles where repair costs were higher compared with vehicle value.
Cat D
Vehicles with repair costs lower than vehicle value but still written off due to insurance decisions.
These categories were replaced by Cat S and Cat N.
Why Check Write Off Category Before Buying?
A write off category can affect:
Vehicle Value
Written off vehicles are usually worth less than similar vehicles without damage history.
Insurance
Some insurers may have different requirements for damaged vehicles.
Resale
Future buyers may avoid vehicles with previous write off history.
Safety
Poor repairs can create safety concerns.
How To Check If A Car Is Cat S Or Cat N
Before buying a repaired vehicle:
Check Vehicle History
Review available records including:
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Write off information
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Vehicle details
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Damage history
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Registration details
Check MOT History
Review:
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Previous MOT results
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Advisories
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Mileage records
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Vehicle condition history
Inspect Repairs
Look for:
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Uneven paint
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Poor panel alignment
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Warning lights
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Electrical problems
Ask For Repair Documents
Request:
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Repair invoices
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Photos before repair
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Parts information
Good documentation provides more confidence.
Common Mistakes When Buying Written Off Cars
Avoid these mistakes:
Only Looking At The Price
A cheap vehicle may become expensive if repairs were poor.
Assuming Cat N Means No Problems
Non-structural damage can still involve expensive repairs.
Ignoring Vehicle History
Always understand why the vehicle was written off.
Skipping Inspection
Photos are not enough.
Always inspect before buying.
How CarVerified Helps Check Write Off Vehicles
CarVerified helps UK buyers research vehicles before purchase.
Using a registration number, users can:
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Check vehicle details
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Review MOT information
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Access available history information
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Check important vehicle records
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Save vehicles in Garage
This helps buyers understand a vehicle’s background before making a decision.
Save Vehicles In CarVerified Garage
When comparing multiple vehicles, users can save important information.
CarVerified Garage helps manage:
•
Vehicle registrations
•
Vehicle details
•
Previous checks
•
MOT reminders
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Tax reminders
This makes vehicle research easier.
Frequently Asked Questions
What Does Cat S Mean?
Cat S means a vehicle has suffered structural damage but has been repaired and can return to the road.
What Does Cat N Mean?
Cat N means a vehicle has suffered non-structural damage.
Is A Cat S Car Safe?
A Cat S car can be safe if repaired correctly and inspected properly.
Is A Cat N Car Worth Buying?
A Cat N car can offer good value if the repair quality and history are clear.
Can Cat A Cars Be Repaired?
No. Cat A vehicles cannot return to the road.
Can Cat B Cars Be Put Back On The Road?
No. Cat B vehicles cannot return to normal road use, although some parts may be recovered.
Should I Check A Written Off Car Before Buying?
Yes. Always check category information, vehicle history, MOT records and repair quality.
Conclusion
Understanding Cat A, Cat B, Cat S and Cat N categories is essential when buying a used vehicle.
A written off car is not automatically a bad purchase, but buyers need to understand the damage history and repair quality.
Cat S and Cat N vehicles can provide excellent value when properly repaired and carefully checked.
CarVerified helps UK drivers check vehicle information, save cars in Garage and make smarter used car decisions.
Before buying any repaired write off vehicle, check the history first.
Avoiding car scams
A write-off can be hidden by a seller. See the used car scams guide.

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A write-off can look fine but be worth far less and harder to insure or sell. Check its category and history before you buy.
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Related Guides
Table of Contents
1.
What Is A Write Off Category?
2.
Cat A Explained UK
3.
Cat B Explained UK
4.
Cat S Explained UK
5.
Cat N Explained UK
6.
Cat S Vs Cat N Difference
7.
Old Write Off Categories: Cat C And Cat D
8.
Why Check Write Off Category Before Buying?
9.
How To Check If A Car Is Cat S Or Cat N
10.
Common Mistakes When Buying Written Off Cars
11.
How CarVerified Helps Check Write Off Vehicles
12.
Save Vehicles In CarVerified Garage
13.
Frequently Asked Questions
14.
Conclusion
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