Vehicle Write-Off Categories Explained: Cat A, B, S, N

If your insurer has told you your car is a "write-off," it does not necessarily mean it is heading for the scrapyard. Write-offs are categorised based on the type and extent of damage. Some categories mean the car is beyond repair. Others mean it can be fixed but the repair cost exceeds what the insurer is willing to pay. Understanding the difference matters because it affects what happens next and how much you get.

This is the most severe category. A Cat A write-off means the vehicle is so badly damaged that no part of it should be salvaged or reused. The entire car must be crushed. This is typically the result of a fire, severe structural damage, or a high-speed collision that has compromised every part of the vehicle.

Cat A vehicles cannot be repaired or returned to the road. They are destroyed completely.

A Cat B write-off means the body shell must be destroyed, but individual parts (engine, gearbox, wheels, electronics) can be stripped and sold. The car itself can never be repaired or registered for road use again, but usable components can go on to live in other vehicles.

Cat S (formerly Cat C) means the car has structural damage. That includes the chassis, frame, or crumple zones. The car can be repaired, but it needs professional work and should be inspected before going back on the road. An insurer writes it off because the repair cost is high relative to the car's value, not because the car is beyond saving.

If you buy a Cat S vehicle or your car is given this category, it must be re-registered with the DVLA before it can legally be driven. A Cat S marker stays on the vehicle's record permanently, which will reduce its resale value.

Cat N (formerly Cat D) is the least severe category. The damage is non-structural, meaning it affects things like the bodywork, electrics, or cosmetic elements, but not the chassis or frame. These cars are often perfectly repairable and can go back on the road without DVLA re-registration (though the Cat N marker still appears on the vehicle history).

Many insurance write-offs fall into this category. An older car with a dented wing and a cracked bumper might cost £2,000 to repair but only be worth £1,800. The insurer writes it off because the maths do not add up for them, not because there is anything seriously wrong with it.

If your car is written off, the insurer will offer you the pre-accident market value of the vehicle. This is based on the age, mileage, condition, and specification of your car at the time of the accident. If you think the offer is too low, you can challenge it. Check what similar vehicles are selling for on Auto Trader, and send those listings to the insurer as evidence. You are under no obligation to accept the first offer.

With Cat S and Cat N vehicles, you may have the option to keep the car and have the insurer pay out a reduced amount (the market value minus the salvage value). This lets you arrange your own repairs, which sometimes works out better financially.

If your car has been written off and you are not happy with the settlement offer, or if you need help understanding your options, get in touch. We deal with write-off claims regularly and we know how to negotiate a fair payout.

Start your claim online or call us for a chat.