A car write-off category tells you how an insurer classified a vehicle after damage. In the UK, the current categories are A, B, S and N. Categories A and B must not return to the road as complete vehicles. Category S and N vehicles can be repaired and used again, provided they are roadworthy.
What does it mean when a car is written off?
An insurer may declare a vehicle a total loss when it is unsafe to repair or when repairing it is not economical compared with its pre-accident value. This does not always mean the damage looked severe. Labour, parts, paint, diagnostics, recovery and hire-car costs can make a repair uneconomic, especially on a lower-value vehicle.
The category describes the type of loss and whether the vehicle or any of its parts may be reused. The official GOV.UK insurance write-off guidance sets out the four categories.
| Category | What it means | Can the complete vehicle return to the road? |
|---|---|---|
| Cat A | Severely damaged; the entire vehicle must be crushed. | No |
| Cat B | The body shell must be crushed, although some safe parts may be salvaged. | No |
| Cat S | Repairable structural damage. | Yes, after a safe repair to a roadworthy condition |
| Cat N | Repairable non-structural damage. | Yes, after a safe repair to a roadworthy condition |
Category A: the entire vehicle must be destroyed
Category A is the most serious classification. The vehicle and all of its components are intended to be crushed. It must not be repaired, broken for reusable parts or returned to the road.
If a car advertised for road use has a Category A record, do not buy it. Check that the registration number and VIN have not been copied from another vehicle and report serious identity concerns to the police.
Category B: the body shell must be crushed
A Category B vehicle is also unsuitable for repair as a complete vehicle. Its body shell must be destroyed, but suitable undamaged parts may be recovered by an authorised operator and used elsewhere.
The vehicle itself must not be returned to the road. Be cautious if a seller describes a Category B car as repaired, road-ready or awaiting an MOT.
Category S: repairable structural damage
Category S means the vehicle suffered damage to a structural part, such as an element of the chassis or crumple structure, but the insurer considered it repairable. The classification does not certify the quality of a later repair.
Before buying a Cat S car, ask for:
- photographs taken before and during the repair;
- itemised invoices for parts and labour;
- the name and credentials of the repairer;
- wheel-alignment or body-measurement reports where relevant;
- evidence that airbags, seatbelt pretensioners and driver-assistance sensors were correctly replaced and calibrated;
- an independent inspection from a qualified engineer.
A fresh MOT is useful, but it is not a substitute for a structural inspection. An MOT checks minimum roadworthiness items at the time of the test; it is not a certificate confirming the standard of every accident repair.
Category N: repairable non-structural damage
Category N means the insurer did not classify the damage as structural. The vehicle may still have significant mechanical, electrical or safety-system damage. Examples can include suspension, steering, brakes, wiring, batteries, airbags, sensors or cosmetic panels.
Do not assume Cat N means “minor” or “cosmetic only”. Ask what was damaged, which parts were fitted and how the repaired systems were tested. Flood or fire-related damage can also create faults that appear later.
What happened to Cat C and Cat D?
Categories C and D were used under the previous salvage system. They were replaced by categories S and N in October 2017. Older vehicles can still show a historic Cat C or Cat D marker because the original classification remains part of their record.
- Cat C generally meant the repair cost exceeded the vehicle’s pre-accident value.
- Cat D generally meant the vehicle could be repaired for less than its value, but other costs made the claim uneconomic.
Do not try to translate C directly to S or D directly to N. The old categories focused on repair economics, while S and N distinguish structural from non-structural damage.
How to check whether a car has a write-off category
- Get the registration number and VIN. Check that the VIN on the vehicle matches the V5C and appears consistent wherever it is stamped or displayed.
- Run a vehicle history check. A write-off history check can reveal a recorded insurance total-loss marker and its category.
- Check DVLA and MOT details. Compare the make, model, colour, engine details and MOT mileage with the seller’s description. GOV.UK lists the core checks to make before buying a used vehicle.
- Ask for the damage and repair file. A credible seller should be able to explain what happened and support the explanation with photographs and invoices.
- Inspect the car independently. For Cat S in particular, use an engineer or body-repair specialist who is not connected to the seller.
- Speak to your insurer. Confirm that cover is available and compare the premium before paying a deposit.
A history check reports data that has been recorded and matched to the vehicle. It cannot prove that a car has never had unreported damage, and it cannot assess repair quality. Combine the record with documents and a physical inspection.
Is it safe to buy a Cat S or Cat N car?
It can be, but only after careful checks. A professionally repaired Cat S or Cat N car may be roadworthy and cost less than an equivalent car without a write-off marker. The saving must be weighed against uncertainty about the original damage, insurance terms, future faults and a lower resale value.
Walk away if the seller will not provide the VIN, discourages an inspection, has no repair evidence, gives inconsistent explanations or pressures you to pay quickly. Also compare the asking price with similar categorised vehicles rather than with cars that have a clean history.
Write-off inspection checklist
- Registration and VIN match the V5C and DVLA record
- Write-off category and date are known
- Before-and-after photographs are available
- Repair invoices identify parts and labour
- Panel gaps, paint finish and welds have been checked
- Tyres wear evenly and the vehicle tracks straight
- No warning lights remain illuminated
- Airbags, seatbelts and driver-assistance systems have been checked
- An independent inspection has been completed
- Your insurer has confirmed cover and price
For more detail on physical warning signs, read our guide to checking whether a car has been in an accident. If a history check returns a total-loss marker, our MIAFTR guide explains how recorded insurer data is used.
Frequently asked questions
Does a Cat S or Cat N car need a special test?
There is no separate category-removal test. The vehicle must be roadworthy, insured, taxed and have a valid MOT when one is required. An independent post-repair inspection is still a sensible buyer safeguard.
Does the write-off category disappear after repair?
No. A recorded insurance write-off forms part of the vehicle’s history. Repairing the car does not turn it into a non-categorised vehicle.
Will Cat S or Cat N affect insurance and resale value?
It can. Some insurers apply different terms or may not quote, and future buyers normally expect a lower price. Check insurance and likely resale value before you buy.
Can a clean history check guarantee there was no accident?
No. It can show matched records such as an insurer write-off marker, but minor or privately repaired damage may never have been reported. That is why the physical inspection and repair evidence matter.