Found Cat S or Cat N in a car's history? Or unsure what Cat A and B mean? Here's how UK insurance write-off categories work, which vehicles can return to the road, and what to check before you buy.
What does an insurance write-off mean?
An insurer may declare a vehicle a total loss if repair is uneconomical or the damage makes it unsuitable for safe repair. That decision does not always mean the car was completely destroyed. The category determines whether it must be scrapped or may be repaired and returned to the road.
These vehicles cannot be repaired for road use. Specific destruction rules apply.
These vehicles may return once repaired to a roadworthy condition.
Ask for repair evidence and consider an independent inspection.
Insurance write-off categories are different from MOT defect classifications. A valid MOT is not a complete assessment of the quality of previous accident repairs.
Cat A, B, S and N: what's the difference?
The key distinction is whether the vehicle can ever be used on the road again. For Cat S and N, the type of damage also matters.
Category A · Scrap
CRUSH ENTIRE VEHICLEThe vehicle must be crushed in its entirety. It cannot be repaired for road use, and parts must not be salvaged for reuse.
Category B · Break
NOT FOR ROAD USEThe body shell or structure must be crushed. Some undamaged components may be salvaged, but the vehicle must never return to the road.
Category S · Structural
REPAIRABLEThe vehicle has sustained structural damage. It may return to the road only after appropriate repairs make it roadworthy.
Category N · Non-structural
REPAIRABLEThe damage is not structural. That does not mean it is merely cosmetic: important safety-related components may still be affected.
Is buying a Cat S or Cat N car a bad idea?
Not automatically. A properly repaired write-off may offer value, but the asking price should reflect its history and you need confidence in the repairs. The category alone cannot show whether work was completed to a good standard.
What was damaged?
Ask for photographs, repair estimates or a clear description of the original damage.
Who repaired it?
Request invoices and evidence that any structural or safety-related work was completed correctly.
Has it been inspected?
For reassurance, arrange an independent inspection, especially for vehicles with structural damage.
Can you insure it?
Get a quote before buying. Cover availability and premiums can differ between insurers.
Five questions worth asking
When and why was it written off?
Look for a clear account of the incident and the damage involved.
Do you have repair documentation?
Invoices, photos and parts records help establish what was fixed.
Does the VIN match the V5C?
Check that the vehicle's identity and registration information are consistent.
What does its wider history show?
Review mileage, MOT history and any available finance or other vehicle-history alerts.
Will you allow an inspection?
Be cautious if the seller refuses an independent check of a repaired write-off.
Your used-car write-off checklist
- Confirm which write-off category is recorded and when it was assigned.
- Ask for photographs and evidence of the original damage and completed repairs.
- Match the VIN and V5C details with the vehicle you are viewing.
- Arrange an independent inspection if the vehicle has been repaired after significant damage.
- Check MOT history and mileage records, and consider a fuller vehicle history check.
- Get an insurance quote and compare the asking price with similar cars.
Car write-off FAQs
Can a Cat S car be driven again?
Yes, potentially. A Cat S vehicle can return to the road once it has been appropriately repaired and is roadworthy, and the usual legal requirements for using it on the road are met.
Does Cat N mean only cosmetic damage?
No. Cat N means the damage is non-structural; it can still involve safety-related systems. Inspect the car and check the repair history rather than relying on the label.
What happened to Cat C and Cat D?
These were older write-off classifications used before the system changed in October 2017. Older vehicle-history records may still show them.
Will a written-off car cost more to insure?
It might. Some insurers charge more or impose conditions, while others may not offer cover. Check directly with your chosen insurer before committing to a purchase.