How to Check if a Car Has Been Written Off
Buying a used car that has been written off — without knowing it — is one of the most expensive mistakes a buyer can make. A write-off can knock thousands off a vehicle's value, make it harder to insure, and in some cases mean you're driving something that was never safely repaired. This guide explains exactly what a write-off is, what each category means, and how to check before you commit.
What does "written off" actually mean?
A car is "written off" when an insurance company decides it is uneconomical or unsafe to repair after an accident, flood, fire or theft. It doesn't always mean the car is a wreck — a relatively minor accident on an older, lower-value car can lead to a write-off simply because the repair cost exceeds the car's market value.
Crucially, many written-off cars are repaired and legally returned to the road. There is nothing illegal about buying or selling a repaired write-off — but you have a right to know, and to pay a fair price that reflects the car's history.
The UK write-off categories explained
Since 2017 the UK uses four salvage categories. Two relate to structural condition (the current system) and two are older categories you may still see referenced on a vehicle's history.
| Category | What it means |
|---|---|
| CAT A | Scrap only. The vehicle must be crushed entirely, including all parts. It should never reappear on the road. |
| CAT B | Body shell must be crushed, but some salvageable parts may be reused in other vehicles. Should never return to the road as a whole car. |
| CAT S | Structural damage (formerly Cat C). The chassis, frame or crumple zones were damaged. Can be professionally repaired and re-registered with DVLA. |
| CAT N | Non-structural damage (formerly Cat D). Damage to bodywork, electrics or cosmetics, but no structural harm. Can be repaired and returned to the road. |
Never buy a Category A or B car as a runner. If a seller offers a Cat A or Cat B vehicle as roadworthy, walk away immediately and consider reporting it — these should not be on the road.
Category S vs Category N — what's the difference?
This is the distinction that matters most for everyday buyers, because both Cat S and Cat N cars are legal to buy and drive.
Category S (Structural)
The vehicle suffered damage to a structural component — the parts engineered to keep you safe in a crash, such as the chassis, subframe, suspension mounts or crumple zones. A correctly repaired Cat S car can be perfectly safe, but the quality of the repair is everything. A poorly repaired structural write-off can be genuinely dangerous.
Category N (Non-structural)
The damage was limited to non-structural areas — panels, lights, bumpers, electronics or trim. Despite sounding minor, "non-structural" can still include important items like steering or braking components that aren't part of the structure, so a Cat N car still warrants careful inspection.
How a write-off affects you
- Value: A recorded write-off typically reduces a car's resale value by 20–50%, even after a flawless repair. If you pay full market price for a written-off car, you've overpaid significantly.
- Insurance: Some insurers charge higher premiums for previously written-off vehicles, and a few won't cover them at all. Always confirm you can insure a car before buying.
- Safety: The repair quality is the real risk. A structural repair done badly can compromise crash protection. Always get an independent inspection of any Cat S car.
- Resale: When you come to sell, you must legally disclose the write-off — and you'll face the same buyer hesitancy you should be applying now.
How to check if a car has been written off
A write-off marker is not held on the free DVLA or DVSA records, so a basic check won't reveal it. To uncover write-off history you need a full vehicle history check, which queries the insurance industry's salvage and write-off databases.
Start with a free carDNA check to confirm the official basics — make, model, MOT history, tax and emissions all match what the seller claims. Then, before any used purchase, run a full history check to reveal write-off category, outstanding finance, stolen status and mileage history.
Private sellers don't have to tell you. Unlike dealers, private sellers have no legal obligation to disclose a write-off. The responsibility to check sits entirely with you as the buyer.
Warning signs to watch for
- A price noticeably below similar cars — often the biggest red flag
- Mismatched paint shades or overspray on rubber seals and trim
- Uneven panel gaps or doors and the bonnet that don't line up
- Fresh underseal or signs of welding underneath the car
- A seller reluctant to let you arrange an independent inspection
- Replacement panels that look newer than the rest of the car
What to do if a car has been written off
A recorded write-off isn't automatically a reason to walk away — but it changes the deal. If you still want the car: confirm the exact category, insist on an independent inspection (especially for Cat S), check you can insure it affordably, and negotiate a price that genuinely reflects the reduced value. If the seller didn't disclose the write-off upfront, treat that as a serious trust issue.
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