Repair or replace · 10 min read
In short
Cat S means the car had structural damage but can, in principle, be repaired and put back on the road, while Cat N means the damage was non structural, such as bumpers or panels, and again the car can usually be repaired.
To help owners and buyers who have seen a Cat S or Cat N marker understand what it means and what happens next, alongside our existing write-off categories page.
The four ABI categories in brief
When an insurer decides a car is uneconomical to repair, it is assigned one of four categories set out by the Association of British Insurers. Cat A means the car should be crushed in its entirety, nothing is reused. Cat B means the body shell must be crushed but usable parts can be salvaged. Cat S means the car had structural damage but, once properly repaired, could be safely returned to the road. Cat N means the damage was non structural, so things like bumpers, doors, lighting or trim, and the car did not need chassis or suspension mounting point repairs.
This page is a companion to our fuller breakdown on the write-off categories, which covers how insurers reach these decisions in more depth. If you want the background on the whole write-off process, that page is the better starting point, and this one focuses specifically on the practical side of Cat S and Cat N cars.
Structural damage versus non structural damage
Structural damage refers to the parts of the car that carry load and protect the occupants in a crash, such as chassis rails, sills, A pillars, suspension turrets and subframes. If any of these areas were affected, the car will usually be marked Cat S rather than Cat N, even if the actual repair bill is similar. Non structural damage covers cosmetic and bolt on parts, bumpers, wings, bonnets, doors, wheels and lights, which do not affect the structural integrity of the car when damaged.
The distinction matters because structural repairs demand more specialist equipment, jigs and checks to confirm the car has been pulled back to the manufacturer's original measurements. A Cat N car with heavy cosmetic damage across several panels can sometimes cost more to fix than a Cat S car with a single straightforward structural repair, so the category is not a direct measure of repair cost or difficulty.
Can a Cat S or Cat N car be repaired properly
Both categories can, in principle, be repaired and driven again, but the quality of that repair depends entirely on who does it and to what standard. A Cat S repair should only be carried out by a body shop capable of structural work with correct jigging and measuring equipment, and the finished car should be inspected before it goes back on the road. A poorly repaired Cat S car can carry hidden risks, so it is worth asking any seller for full repair documentation and, ideally, an independent inspection.
DVLA notification and the V5C
- 01Cat S and Cat N vehicles must be registered with DVLA as previously written off, this is a legal requirement on the seller or insurer, not optional
- 02The V5C logbook for a Cat S or Cat N car will show a marker confirming it was written off and repaired
- 03Buyers should check the V5C and run an HPI style history check before purchase to confirm the category is disclosed
- 04Insurers may ask more questions or adjust premiums for a car with a write-off marker on its history
- 05Selling a written off car without disclosing its history is a criminal offence, so honesty at point of sale matters for the seller as much as the buyer
Buying a Cat S or Cat N car
| Consideration | What to check |
|---|---|
| Repair history | Ask for invoices, photos and any structural measuring report |
| Who carried out the work | A body shop used to insurance standard structural repairs is preferable |
| Price | Cat S and Cat N cars typically sell for less than an equivalent undamaged example |
| Future insurance | Some insurers ask about write-off history and may price accordingly |
| Resale | Expect a lower resale value later, this follows the car for its life |
Insurance and value implications
Once a car carries a Cat S or Cat N marker, that stays on its history permanently. It will typically be worth less than an equivalent car without a write-off history, even after a first class repair, because buyers and trade valuations factor in the marker itself. Some owners find their own insurer asks about it at renewal, and premiums can be affected.
None of this means the car is unsafe or a bad purchase, many are repaired to a very good standard and go on to give years of reliable use. It simply means transparency matters, both when selling and when insuring the car going forward.
How we assess repair viability
When we look at a car with a Cat S or Cat N history, or one that an insurer is considering writing off, we assess the actual damage rather than relying on the category label alone. That means checking panel alignment, structural measurements where relevant, and the condition of mechanical and electrical systems behind the damaged area. We can then give a view on what a proper repair would involve and cost.
If you have photos of the damage, sending them over WhatsApp lets us give an early indication before you bring the car in, and a full inspection and free, no-obligation estimate can follow from there.
What this means if your car has just been marked
- Cat S means structural damage was found, repair is possible but should be done to a high standard
- Cat N means the damage was cosmetic or non structural, generally more straightforward to repair
- Your insurer's engineer's report should explain what damage led to the category
- You can ask to keep the car and have it repaired privately rather than accept the settlement, depending on your policy
- A written record of the repair helps protect the car's value and your position when selling later
Where to go next
Not sure what a category means for your car
Send us photos over WhatsApp and we will give you an honest view on repair viability, backed up by a free, no-obligation estimate.
Questions people ask us
- Is a Cat S car safe to drive after repair
- Yes, provided the structural repair was carried out properly with correct measuring and jigging, a Cat S car can be safely returned to the road, and this is why choosing a competent body shop for the work matters.
- Does Cat N affect a car's value as much as Cat S
- Generally no, Cat N tends to have a smaller impact on resale value than Cat S because the damage was non structural, though any write-off marker will reduce value to some degree.
- Can I insure a Cat S car normally
- Most insurers will still cover a Cat S car once repaired, though some ask additional questions about the repair history and may adjust the premium.
- Do I have to tell DVLA if my car becomes a write-off
- The insurer or the party dealing with the write-off is responsible for registering it with DVLA, and this is a legal requirement, not something that can be skipped.
- How do I check if a used car is Cat S or Cat N
- Check the V5C for a write-off marker and run a vehicle history check, which will show any recorded category against the registration.
Cat S and Cat N in short
- Cat S means structural damage was found, Cat N means it was not
- Both can usually be repaired and returned to the road
- DVLA notification is a legal requirement, not optional
- Value and future insurance can be affected permanently
- Repair quality matters more than the category itself