Buying a Cat S or Cat N car can be worth it if the price is low enough, the repair has been done properly and you have checked insurance costs before you pay. Cat N cars with light cosmetic damage are usually the safer bet, while Cat S cars need a much closer look because the damage was structural.

What do Cat S and Cat N actually mean?

When an insurer decides a damaged car is not worth repairing, it gives the car a write-off category. The current system has been in place since October 2017 and has four categories:

- Cat A: the car must be crushed completely, with no parts reused.

- Cat B: the body shell must be crushed, but some parts can be salvaged.

- Cat S: the car has structural damage, such as a bent chassis or damaged crumple zones, but can be repaired and put back on the road.

- Cat N: the car has non-structural damage, such as cosmetic, electrical or trim damage, and can be repaired and put back on the road.

Cat S and Cat N replaced the old Cat C and Cat D labels. A write-off does not always mean a wreck. Insurers write cars off when the repair cost is high compared with the car's value. That means an older car with a smashed bumper, lights and bonnet can end up as Cat N even though the damage looks fairly minor.

Why are Cat S and Cat N cars cheaper?

The write-off marker stays on the car's record for life and shows up on any paid history check. That puts a lot of buyers off, so these cars sell for noticeably less than a clean equivalent. That discount is the whole appeal.

The catch is that you will face the same discount when you come to sell. The saving only matters if you buy at the right price in the first place.

What should I check before buying one?

Do your homework before any money changes hands.

Run a full history check

A paid vehicle history check will confirm the write-off category, whether there is outstanding finance and whether the car has been reported stolen. Also use the free MOT history service on GOV.UK to look at past advisories and mileage readings.

Ask what the damage was

A genuine seller should be able to tell you what happened and show photos taken before the repair. Heavy front-end impacts on Cat S cars deserve the most caution.

Ask who repaired it

Repair invoices from a recognised bodyshop are a good sign. A vague answer, or a car fixed "by a mate" on a driveway, is a warning.

Look closely in person

When you see the car, check for:

- uneven panel gaps

- paint that does not quite match

- overspray on rubber seals

- fresh welds under the carpets or in the boot

Make sure all airbag and warning lights go out after start-up. Uneven tyre wear can point to alignment problems after a structural hit.

Get an independent inspection

For a Cat S car especially, paying for an inspection by an independent engineer or motoring organisation is money well spent. On the test drive, the car should feel straight and stable, with no pulling to one side under braking.

Can I insure a Cat S or Cat N car?

Yes, but shop around first. Some insurers will not cover Cat S cars at all, and others charge more or offer limited cover. Get quotes on the exact registration before you buy, not after.

You must declare the write-off category when you take out a policy. If you do not, the insurer could refuse to pay a claim or cancel the policy.

Keep in mind too that if the car is written off again, any payout will be based on its market value as a repaired write-off. That is lower than the value of a clean car.

Some lenders are also less keen to offer finance on a write-off, so check this early if you are not paying in full.

Is a Cat S or Cat N car worth it?

It can be, if you plan to keep the car for a long time, the discount is big and the repair is well documented. It makes less sense if you change cars every couple of years, because the resale penalty eats into what you saved.

What happens when it reaches the end of its life?

A previous write-off can still be scrapped or sold for salvage like any other car. Be upfront about its history when you get a quote. Motorwise premium salvage quotes assume a car has never been written off, so declaring the category at the start avoids a revised offer on collection day.

You can compare scrap and salvage offers here , or get a scrap car quote with free collection in seconds.

Conclusion

A Cat N car with light, documented damage can be a sensible way to save money. A Cat S car can be a good buy too, but only after a proper history check, a close inspection and insurance quotes in hand. If anything about the car or the seller feels off, walk away. There will always be another one.

Frequently asked questions

Is Cat N better than Cat S?

Generally, yes. Cat N means the damage was non-structural, while Cat S means the structure of the car was damaged, so a Cat S car needs a more careful inspection.

Do I have to tell my insurer a car is Cat S or Cat N?

Yes. You must declare the write-off category, and failing to do so could lead to a claim being refused or your policy being cancelled.

Can you scrap a Cat S or Cat N car?

Yes. A repaired write-off can be scrapped at an Authorised Treatment Facility like any other car. Mention its write-off history when you get your quote.