What does Cat S mean?
It just means you need to check a few specific things before you buy.
This guide is part of our guide to car history checks. Below is what Cat S actually means, how one of these cars gets back on the road, and exactly what to check before you hand over any money.
Cat S is a salvage category from the ABI Code of Practice for the Categorisation of Motorised Vehicle Salvage, the industry rulebook insurers use to grade written-off vehicles (current edition: V12, May 2025).
A car is graded Cat S when it has suffered structural damage — damage to a load-bearing part such as the chassis, frame or the safety cell that protects you in a crash. The key word is repairable. Cat S doesn't mean the car is unsafe to ever fix; it means the insurer worked out that a proper repair would cost more than the car was worth, so it paid out and sold the wreck as salvage. In insurance terms that's a "constructive loss" — written off on cost, not because it can never be roadworthy again. Once it's been repaired properly, it can be taxed, insured and driven like any other car.
Cat S vs Cat N — what's the difference?
The difference is where the damage is.
- Cat S (Structural): damage to a structural part — chassis, frame, safety cell. Repairable, and road-legal once repaired.
- Cat N (Non-structural): damage that isn't to the structure — electrics, panels, trim, and sometimes safety-related items like steering, brakes or airbags, but not the frame itself. Also repairable and road-legal.
Both cover cars that can go back on the road; the line between them is simply whether the structure took a hit. That matters, because structural repairs are harder to do well and harder to verify — which is why a Cat S car deserves a closer look than a Cat N one. If you're weighing up a Cat N car instead, see our guide to Cat N cars for the full picture.
What happened to Cat C and Cat D?
If you've seen "Cat C" or "Cat D" on older listings, those are the old system. On 1 October 2017 the ABI replaced Cat C and Cat D with Cat S and Cat N, to grade cars by the type of damage rather than just the repair cost. Older cars written off before that date may still carry a Cat C or Cat D marker.
Two categories can never go back on the road:
- Cat A: scrap only — the entire vehicle must be crushed, nothing salvaged.
- Cat B: the body shell must be crushed, though some parts can be reused.
Cat A and Cat B are "actual losses" and DVLA will not re-register them. Cat S and Cat N are the only two written-off categories a car can legally return to the road from. See our guide to all four write-off categories for the full rundown of Cat A to Cat N.
How a Cat S car gets back on the road
DVLA and the V5C logbook
When a car is written off, the insurer notifies DVLA, and DVLA records the vehicle's category on the logbook (V5C). For a Cat S car, you send the complete logbook to your insurance company; whoever keeps or buys the repaired car then applies to DVLA for a fresh V5C using form V62 (it's free). By law you must tell DVLA a car has been written off — you can be fined up to £1,000 if you don't. This is where Cat S and Cat N differ on paperwork: with a Cat N car you're allowed to keep the logbook.
The category stays on the vehicle's record. Repairing the car doesn't wipe the Cat S marker — it keeps showing up on a proper history check, which is why you can still spot it years later.
MOT, tax and insurance before it's driven again
A repaired Cat S car isn't road-legal just because the panels line up. Before you can tax it, it needs a valid MOT — gov.uk requires a valid MOT in place when the tax starts. You'll also need insurance before you drive it, and as covered below, not every insurer will quote on a written-off car.
Should you buy a Cat S car?
A well-repaired Cat S car, priced to reflect its history, can be a genuine bargain. But go in with your eyes open on three things.
Insurance — get a quote before you buy, not after
gov.uk's guidance is blunt here: contact an insurer before you purchase a written-off vehicle. Getting a quote first means any saving on the purchase price isn't wiped out by a higher premium — and some insurers won't cover a previously written-off car at all. Don't assume; get the quote in writing before you commit.
Finance — check with the lender first
Financing a Cat S car can be harder than financing a clean one. Some lenders decline or restrict finance on previously written-off vehicles as a matter of policy, and others don't — there's no single rule, and we've found no reliable published figure on how many. If you're planning to borrow, confirm the lender will finance this specific car before you agree to buy it, rather than finding out afterwards.
Resale value — expect less, and fewer buyers
A Cat S marker doesn't vanish, so the next buyer sees it too. In practice that means a smaller pool of buyers and, usually, less money than an equivalent car with a clean history. You'll see specific percentages quoted around the web, but they don't trace back to any published data source — so the safe assumption is simply "less, and slower to sell".
When to walk away, and when it's a reasonable buy
Walk away if there's no evidence of who repaired the car or how, if the seller is cagey about the damage, or if you can't get an independent engineer to look at it. A reasonable buy looks like the opposite: a documented professional repair, a clean independent inspection, a price that reflects the history, and an insurance quote you're happy with.
How to check if a car is Cat S
Our free car check is worth running, but know its limits: it shows MOT pass/fail results, recorded mileage and tax status — it does not show write-off or salvage category. A car can be Cat S and have a spotless MOT record.
To actually see a Cat S marker, you need a paid history check that draws on insurer-reported salvage data. Our Comprehensive check reports the write-off category alongside outstanding finance, stolen markers and mileage history — you can see a sample Comprehensive check report before you buy one. gov.uk's own consumer guide recommends getting a private history check for exactly this reason.
One point on your rights: if you buy from a dealer, the Consumer Rights Act 2015 requires the car to be "of satisfactory quality" and "as described", so an undisclosed write-off can give you grounds to complain. A private seller isn't held to that same standard, but can still be liable if they actively lie about the car's history. Either way it's no substitute for checking yourself first — gov.uk and Citizens Advice are the places to confirm where you stand.
FAQs
What does Cat S mean on a car?
It means the car had structural damage (to the chassis, frame or safety cell) and was written off by an insurer because repairs cost more than the car was worth. It can be repaired and legally return to the road.
What's the difference between a Cat S and a Cat N car?
Cat S is structural damage; Cat N is non-structural (electrics, panels, trim, sometimes safety parts, but not the frame). Both can be repaired and driven again — Cat S just involves the harder-to-verify structural repair.
Is a Cat S car safe to buy?
It can be, if it's been properly repaired. Get an independent engineer to inspect the structural repair and confirm it was done correctly before you buy.
Does the Cat S marker ever go away?
No. The category is recorded on the vehicle's record and stays there after repair, so it will keep appearing on history checks.
Can you get insurance on a Cat S car?
Usually yes, but not every insurer will cover a written-off car, and the premium can be higher. Get a quote in writing before you buy.
Can you get finance on a Cat S car?
Sometimes. Some lenders decline or restrict finance on written-off cars and others don't — check with your lender about the specific car before you commit.
How do I check if a car is Cat S before I buy it?
Not with a free check — even our own free car check shows MOT history, mileage and tax status but not write-off category. Use a paid history check such as our Comprehensive check, which reports the write-off category.