Insurance Write-Off Guide (UK) — Cat A, B, S & N Explained

Written Off? Everything You Need to Know About Insurance Write-Offs & Total Loss Settlements

If your insurer has told you your vehicle is 'a total loss' or a 'write-off', it means the cost of repairs (plus salvage) is close to, or higher than, what they think the car is worth. But being written off is not the end of the road — and the first offer you receive is very rarely the best one you can get. This guide explains exactly how write-offs work in the UK, what each ABI salvage category means, and the practical steps to take to protect your money, your no-claims bonus and your right to a fair settlement.

What is an insurance write-off?

A vehicle is written off when the insurer decides that repairing it isn't economical — usually when repair costs exceed a percentage of the pre-accident market value, once salvage value is factored in. It does not always mean the car is beyond repair; many written-off vehicles are structurally sound and drive perfectly.

The decision is made by the insurer's engineer, working from garage estimates, photos and industry salvage codes agreed under the ABI (Association of British Insurers) Code of Practice.

The four salvage categories

The current UK categories are Cat A, B, S and N. The old Cat C and Cat D were replaced in 2017 to reflect structural damage rather than just repair cost.

Category A — Scrap only

Severe damage. The entire vehicle must be crushed, including all parts. Nothing can be recycled or re-used.

Category B — Break for parts

The bodyshell must be crushed, but serviceable parts can be salvaged and re-sold. The vehicle can never legally return to the road.

Category S — Structurally damaged, repairable

Damage to the structural frame, chassis or crumple zones. It can be repaired and returned to the road, but only after professional structural repair and re-registration with the DVLA.

Category N — Non-structural damage, repairable

Cosmetic, electrical or mechanical damage that doesn't affect the structural integrity. Can be repaired and returned to the road; still needs to be declared on future insurance.

Any Cat S or Cat N vehicle sold on must legally be declared, and future insurance premiums will typically be higher.

How your settlement figure is calculated

Insurers value the car at its pre-accident market value — what a willing buyer would have paid the day before your accident. They usually take the lower of two published trade guides (typically Glass's and CAP) and adjust for mileage and condition. This is almost always lower than what you'd pay to replace the car with a like-for-like model from a dealer.

Key point: the ABI Code says the settlement should put you in the position you were in immediately before the accident. In practice, first offers are frequently 10–25% below what a genuine market search will support.

How to challenge a low valuation

Get three to five 'like-for-like' adverts — same make, model, year, mileage, trim, from Auto Trader, Motors, dealer websites. Screenshot them with dates.
Add value for extras — service history, new tyres, recent MOT, aftermarket options and any personalised plate you own.
Submit in writing with the adverts, your MOT and service records, and any recent receipts. Ask them to re-evaluate under the ABI Code.
Escalate to a formal complaint if refused — insurers must issue a final response within 8 weeks.
Financial Ombudsman Service (FOS) — free, binding on the insurer. FOS decisions consistently side with policyholders who produce solid comparable evidence.

If your accident wasn't your fault, you don't have to argue with your own insurer at all — you can claim through the at-fault driver's insurer (or through us) and be put back into the position you were in, on a full market-value basis.

Can I keep my written-off car?

Yes, in most cases — for Cat S and Cat N vehicles you can request to retain the salvage. The insurer deducts the salvage value from your settlement and you keep the car. You'll need to:

Notify the DVLA (Cat S must be re-registered).
Have a Vehicle Identity Check (VIC) or professional inspection.
Meet insurance conditions before it goes back on the road.
Declare the write-off status on all future insurance and any resale.

Cat A and Cat B vehicles cannot be retained for road use.

Common mistakes to avoid

Accepting the first offer. It's an opening position, not a final one.
Removing personal items too late. Once the salvage yard has it, you may not get access back.
Cancelling breakdown/insurance too early — you may need the vehicle covered until settlement completes.
Assuming your no-claims bonus is protected. Only a fully protected NCB survives an at-fault claim — and even a non-fault claim can push renewals up unless you claim through the third party.
Signing salvage retention paperwork before agreeing the settlement figure.

Where VIP Claims fits in

If someone else caused your accident, you have a legal right to be put back to where you were — not to be squeezed by your own insurer's book value. We handle the valuation, negotiation and payment directly with the at-fault insurer, arrange a like-for-like replacement vehicle in the meantime, and never touch your no-claims bonus or excess.

Talking to VIP Claims is free and puts you under no obligation. We are an independent, UK-based accident management company — not an insurer. If your accident wasn't your fault, we can arrange a like-for-like replacement vehicle, manage repairs at an approved bodyshop, and recover all costs from the at-fault driver's insurer, protecting your no-claims bonus and keeping your excess in your pocket. Speak to a specialist or start your claim online.

Frequently asked questions

What percentage of a car's value has to be damaged for it to be written off?

There's no fixed percentage in UK law. Most insurers use a threshold around 60–70% of the pre-accident market value, once salvage value is deducted. It varies by insurer and by vehicle age.

Is a Cat S or Cat N car safe to drive?

Only after being professionally repaired to manufacturer standards and inspected. A well-repaired Cat N car is often perfectly safe; Cat S involves structural repair and demands specialist attention.

Will a write-off affect my future insurance?

Yes. You must declare a Cat S or Cat N status permanently, and premiums are typically 10–30% higher. Cat A and Cat B vehicles cannot legally return to the road.

Can I refuse the write-off decision?

You can dispute the valuation, but not usually the decision itself — that's an engineering judgement. You can, however, choose to keep the vehicle as salvage in most Cat S/N cases.

How long does a total-loss settlement take?

Typically 2–6 weeks with your own insurer, but often faster through an accident management company when the other driver is clearly at fault.

Do I still owe finance if my car is written off?

Yes. The settlement is paid to the finance company first. If it doesn't clear the balance, GAP insurance (if you have it) covers the shortfall — otherwise you remain liable.

Can VIP Claims help if my insurer's offer is too low?

Yes — if the accident wasn't your fault we can claim the true market value from the at-fault insurer directly, bypassing your own insurer's book value entirely.

What happens to my private number plate?

You can retain it before the vehicle goes to salvage by applying to the DVLA for a V317 retention certificate. Don't delay — once transferred to a salvage yard, retrieval is harder.