How to check if a car is a write-off before you buy it

The short answer

A write-off is a car an insurer decided not to repair. GOV.UK recognises four categories. A and B cannot go back on the road. S (structural damage) and N (non-structural damage) can, if repaired to a roadworthy condition, and many are sold on as ordinary used cars. The DVLA vehicle enquiry on GOV.UK does not show whether a car was written off, and neither does the MOT history. The record is held by insurers and reached through a paid history check, which GOV.UK's own buyer guide recommends.

So the method is: do the GOV.UK checks for the signs, run the paid check for the answer, and if it comes back S or N, ask for the repair evidence and get the car inspected before you pay.

What the categories mean

GOV.UK's insurance write-offs page sets them out. Category A: cannot be repaired, the whole vehicle has to be crushed. Category B: cannot be repaired, the bodyshell has to be crushed but parts can be salvaged. Category S: can be repaired following structural damage and used again if repaired to a roadworthy condition. Category N: the same, following non-structural damage. For a category S car the keeper sends the complete log book to the insurer and applies for a free duplicate using form V62, and DVLA records the category in the new log book. For category N the keeper can keep the original log book, which is why an N car can carry a V5C that says nothing about it.

GOV.UK's consumer guide to buying repaired written-off vehicles adds the plain explanation: A and B are an actual loss, where a vehicle cannot or should not be repaired and is not re-registered by DVLA; S and N are a constructive loss, where repair is possible but would cost more than the vehicle is worth to replace.

Step one: the free checks and the signs to look for

1. The DVLA vehicle enquiry first. GOV.UK's service shows tax, MOT expiry, first registration date, year of manufacture and the date the last V5C was issued. It does not show write-off status. What it can show is a recently reissued log book on an older car, which is exactly what a category S process produces; that is a prompt to ask why, not proof of anything.
2. The MOT history next. The MOT history service lists every test since 2005 with the mileage and the items that failed or were advised. A long gap between tests, a mileage that stops rising for a year, or a test with body and structure items followed by a clean one, are all worth a question. None of them proves a write-off.
3. The log book. GOV.UK's buyer checks say to look for the DVL watermark, to check the vehicle identification number and engine number against the V5C, and to call the police if the serial number falls in the ranges listed there: GOV.UK's line is 101 for a non-emergency and 999 if a crime is in progress (GOV.UK, contact the police). For a write-off, also read the date of issue and any notes DVLA has printed.
4. The car itself. Panel gaps that differ side to side, paint that does not quite match in daylight, new bolts on wings or bonnet hinges, fresh underseal in one area only, and a windscreen or lamps much newer than the rest of the car. A repaired car is not a reason to walk away; an undisclosed one is.

Step two: the paid check, and what to do with the answer

GOV.UK's guide tells buyers to get a private history check, which shows whether the vehicle has previously been written off. That is the only place the insurers' record is visible to a buyer. If it comes back clear, you have the signs above to fall back on, because a repair done outside an insurance claim leaves no marker anywhere. If it comes back S or N, the guide's advice is the right order of business: confirm it has been properly repaired and is roadworthy, ask who handled the car between the total loss and the repair, get an independent expert's report or an engineer's inspection where the damage was structural, and ask for the full service history. If the price looks too good to be true, GOV.UK says, beware.

Two more things from the same guide. Tell your insurer the car was a total loss before you insure it, because not disclosing it can get a later claim rejected. And if you bought from a dealer who did not tell you, consumer law gives you rights; Citizens Advice explains them and can point you to Trading Standards.

What this does not mean

A category S or N marker is a record of an insurer's decision, not a verdict on the car in front of you. Some were lightly damaged and well repaired; some were not. A clear history check is not proof that a car was never damaged, only that no insurer recorded a total loss against it. The checks here reduce your risk and give you the questions to ask; they do not replace an inspection by someone who knows what a repaired structure looks like. This article is general information, not legal advice, based on the GOV.UK pages read on 27 October 2026.

Sources and method

This article contains no MOT statistics. The categories, the log book process and the buyer checks are quoted from the GOV.UK pages listed under Sources, as they read on 27 October 2026. The MOT reliance notice below applies to the MOT history check this article recommends.

• GOV.UK: Scrapping your vehicle and insurance write-offs
• GOV.UK: Buying repaired written-off vehicles, a consumer guide
• GOV.UK: Get vehicle information from DVLA
• GOV.UK: Check the MOT history of a vehicle
• GOV.UK: Checks when buying a used car
• Citizens Advice: Buying a used car

This article is general information drawn from published test records. It is not professional, mechanical or legal advice, and an MOT pass or a clean MOT history does not guarantee that a car is roadworthy today. If you are unsure about a car, have it inspected by a qualified mechanic. You can check any vehicle's MOT history free on the official GOV.UK MOT history service.