What Are Cat N and Cat S Cars? Should a New Driver Buy One?

These categories come from the insurance industry’s own write-off classification, and they follow the car for the rest of its life once applied, whoever owns it next.

The detail

When an insurer decides a car is too expensive to repair relative to its value, they write it off and assign a category:

• Cat A: too damaged to be safely repaired at all. Legally must be crushed, no parts reused.
• Cat B: the body shell must be crushed, but usable parts can be salvaged and sold separately.
• Cat S (structural): the car had structural damage, but has been professionally repaired and can legally go back on the road. The “S” used to be called Cat C before a 2017 industry rule change.
• Cat N (non-structural): damage was not to the structural frame, commonly things like a damaged interior, electrics, or non-structural bodywork. Also repairable and legal to drive once fixed. Used to be called Cat D.

Cat S and Cat N cars are legally roadworthy once repaired and MOT’d, and can be sold like any other used car; the category has to be disclosed by a dealer and shows up on a vehicle history check, but there’s no legal requirement to shout about it in a private sale beyond answering honestly if asked.

What this means for your first car

The honest trade-off: Cat S and Cat N cars are usually priced below an equivalent car without that history, which is the appeal for a tight first-car budget. Against that:

• Resale value takes a bigger hit than the buying discount often reflects, a Cat S/N car is harder to sell on later.
• Some insurers charge more, or won’t cover a Cat S car at all, particularly for a new driver already paying a high premium. Check before you buy, not after.
• Some lenders won’t finance a Cat S/N car, which matters if you’re planning to buy on finance.
• A Cat S repair quality varies hugely. A well-documented professional repair with photos and an engineer’s report is a different proposition to a car with no paperwork at all.

If you’re considering one, get an independent inspection and ask for the full repair history before you commit, and check with your insurer and any finance provider first, not after you’ve paid a deposit.

If you’ve found a specific car and want its MOT history, mileage record and running cost before you decide, check its registration (note: this checks MOT and running cost, not the write-off category itself, that still needs a separate vehicle history check). Still comparing options? First Car Scout shows real listings so you can weigh the discount against the running cost total either way.