What replaced Category C and Category D?

In October 2017, the ABI replaced Category C and Category D with Category S (Structural) and Category N (Non-Structural) to focus on the type of damage rather than the cost of repair.

Is it hard to insure a Category S or Category N car?

Yes, some insurers refuse to cover previously written-off vehicles. Those that do will often charge a higher premium because the car's structural integrity or electronics may pose a higher risk.

Does a Cat N or Cat S status ever clear from a car's history?

No. Once a vehicle is recorded on the Motor Insurance Anti-Fraud and Theft Register (MIAFTR) as a write-off, that marker stays with the vehicle for the rest of its life, regardless of how well it is repaired.

UK Car Laws & Safety

What is a Category S or Category N Write-Off?

Seeing "Cat S" or "Cat N" on an advert means the car was previously written off by an insurer. Here is exactly what those labels mean, and whether buying one is a bargain or a death trap.

In the UK, when a car is involved in an accident, flooded, or stolen and recovered, the insurance company sends an assessor to evaluate the damage. If the cost of repairing the vehicle (using official parts and approved labor rates) exceeds a certain percentage of the car's current market value, the insurer will declare it an "uneconomical repair"—commonly known as a write-off.

In 2017, the Association of British Insurers (ABI) overhauled the salvage categories. They moved away from focusing purely on the cost of repair (the old Cat C and D) and shifted the focus to the safety and structural integrity of the vehicle (the new Cat S and N).

1. Category S Explained: Structural Damage

The "S" stands for Structural. A Category S write-off means the vehicle has sustained damage to any part of its structural frame or chassis.

What is considered "Structural"?

The chassis (the main load-bearing framework).
The A, B, or C pillars (the posts supporting the roof).
The suspension mounting points.
The front/rear crumple zones and cross-members.

Can it go back on the road? Yes. A Cat S vehicle can legally be sold and driven again, but it must be professionally repaired. The DVLA will re-issue the V5C logbook with a permanent note stating the vehicle has been salvaged due to structural damage.

Warning: A poorly repaired Cat S car is a death trap. If the crumple zones were compromised and not properly reinforced, the car will not protect you in a secondary crash.

2. Category N Explained: Non-Structural Damage

The "N" stands for Non-Structural. A Category N write-off means the car suffered damage that was uneconomical to repair, but the underlying structural frame remained intact.

This often applies to:

Heavy cosmetic damage (multiple panels dented or scratched).
Complex electrical faults (e.g., modern wiring looms destroyed by a rat, or deeply embedded sensor failure).
Mechanical damage (e.g., a blown engine or ruined gearbox).
Minor flood damage (where water reached the carpets but not critical engine components).

Can it go back on the road? Yes. However, unlike a Cat S, the DVLA does not print a permanent warning on the V5C logbook for a Cat N. This makes Cat N vehicles incredibly easy for scammers to sell to unsuspecting buyers without mentioning the history. The only way to know is via a background data check.

3. What About Category A and Category B?

Categories S and N are for repairable vehicles. The ABI also defines two other categories for cars that are so badly destroyed they pose an extreme hazard:

Category A (Scrap)

The vehicle is a total loss. It must be crushed entirely, including all parts. Nothing can be salvaged. Often applies to severe fire damage or catastrophic multi-car pile-ups.

Category B (Break)

The body shell/chassis must be crushed. However, non-structural, undamaged parts (like seats, a working radio, or an intact engine block) can be salvaged and sold.

4. Should You Buy a Cat S or Cat N Car?

Written-off cars are typically priced 20% to 40% cheaper than a non-accident equivalent. While tempting, you must weigh the pros against severe long-term cons:

Consideration	The Reality
Insurance Premiums	Many insurers refuse to cover Cat S/N cars. Those that do will charge significantly higher premiums due to the unknown risk factor of the repair work.
Resale Difficulty	Main dealers (like Arnold Clark or Cinch) will outright refuse to accept a Cat S/N as a part-exchange. You will have to sell it privately.
Safety Verification	Unless the seller can provide an independent engineer's report (like an Autolign inspection) detailing the repair, you are gambling with your safety.