Car write-off claim: Cat A/B/S/N, market value and GAP

The ABI Salvage Code 2017 categories A, B, S and N

The Association of British Insurers Salvage Code 2017, in force from 1 October 2017, replaced the old four-category code that had been in use since 2002. The current categories are A (scrap), B (parts), S (structural) and N (non-structural). The previous categories C (uneconomical to repair) and D (light damage) were retired because they did not adequately distinguish between structurally compromised vehicles and lightly-damaged ones, with safety consequences when poorly-repaired Cat C vehicles returned to the road.

Category A is the most severe. The vehicle is total loss and must be crushed. Its parts cannot enter the supply chain. This category is typically reserved for fire damage, severe water damage, catastrophic structural failure or vehicles that cannot be safely identified. Once Cat A is recorded, the vehicle is permanently destroyed. The DVLA flags the VIN to prevent any future registration attempt.

Category B is also total loss but with a salvage value in the parts. The body shell must be destroyed but mechanical parts - engine, gearbox, axles, electronics - can be removed and resold. Typical Cat B vehicles are major collision losses where the chassis is bent or the unitary body is compromised but the powertrain is intact. The vehicle cannot be returned to the road. The DVLA again flags the VIN.

Category S is for vehicles with structural damage that are theoretically repairable. ‘Structural’ in this context means damage to the load-bearing parts of the body or chassis - the A, B or C pillars, the floor pan, the engine bay rails, the rear quarter panel rails. Repair is permitted but the V5C history will permanently show the Cat S marker, and the vehicle’s resale value is permanently reduced (typically by 25-40%). Cat N is for non-structural damage - body panels, lights, glass, mechanical components - that does not affect the structural integrity. Again, repair is permitted and the V5C history is marked permanently.

Pre-accident market value: how it is calculated and contested

The pre-accident market value (PAV) is the figure a willing buyer would pay a willing seller for the vehicle in the condition it was in immediately before the accident. The legal principle is the same compensatory rule as for repair: restitutio in integrum (Livingstone v Rawyards Coal Co (1880) 5 App Cas 25). The claimant is to be put back, so far as money can do it, into the position they would have been in had the accident not occurred - financially equivalent to owning the same vehicle in the same condition.

The valuation tools are Glass’s Guide, CAP Black Book and live retail comparables from Autotrader, Auto Express, dealer websites and (for specialist vehicles) marque-specific publications. Glass’s and CAP each publish trade and retail figures; the relevant figure for a private claimant is the retail figure (what they would pay to replace the vehicle in the market), not the trade figure (what a dealer would pay to acquire it). The insurer’s engineer typically opens with the trade figure or an average of trade and retail; the claimant’s counter-valuation pushes toward the retail figure with retail comparables to support it.

Adjustments apply on both sides. Upward: documented service history (especially main-dealer with VOSA-traceable invoices), recent major service work, recent MOT with no advisories, low mileage relative to the comparables, factory-fitted optional extras (with the VIN-linked options list from the manufacturer), recent improvements (new tyres, premium tyre upgrades, paint correction, recent battery on EVs), dental work and detailing. Downward: damage at the time of the accident that pre-existed the collision (kerbing, scuffs, dents), poor service history, high mileage, expired MOT, missing service book, evidence of previous claims (visible on a Cat S/N pre-marker).

Where the parties cannot agree, the Financial Ombudsman Service is the dispute resolution route for retail customers. The FOS has a long track record of awarding uplifts on under-valued total losses, with the standard remedy being recalculation by reference to an average of two or more retail trade publications. The prospect of an FOS referral focuses insurer minds, and the FOS database of past decisions is searchable for precedents.

The V5C marker and the resale impact

Once a vehicle is recorded under Category A, B, S or N, the V5C registration document (the ‘logbook’) and the DVLA records permanently carry the marker. Future buyers can see the salvage history through HPI, AutoCheck, CarVeto and similar VIN-history services. A Cat S marker reduces resale value by about 25-40% on a typical mainstream car; a Cat N marker by about 15-25%. The percentages vary by make, model, market segment and the buyer’s willingness to tolerate a salvage history.

For a retained-salvage claim - where the claimant keeps the Cat S or Cat N vehicle and repairs it - the diminished-value consequence is part of the compensation analysis. The vehicle’s post-repair market value, even after a quality repair, is materially lower than the pre-accident market value because the V5C marker is permanent. See our diminished value claim page for the full treatment.

Retained-salvage settlements: keeping the vehicle

A claimant whose vehicle is categorised Cat S or Cat N can elect to retain the salvage and repair the vehicle themselves. The election is made before the insurer disposes of the salvage. Retained-salvage settlements are calculated as: pre-accident market value minus the salvage value the insurer would have realised on disposal. The salvage value is typically 15-30% of the PAV for Cat S vehicles and 10-20% for Cat N vehicles, varying by the make/model/year demand for parts. The claimant therefore receives 70-85% of the PAV in cash and keeps the vehicle.

Retained-salvage is attractive where the claimant has an emotional attachment to the vehicle, where the salvage value is lower than the diminished-value loss (so the claimant nets more by retaining), or where the repair cost is materially lower than the salvage value the insurer would receive. It is not attractive where the repair cost approaches the retained settlement and the claimant has limited time or skills to manage a complex repair. The independent engineer’s inspection establishes whether retention is economically rational on the specific vehicle.

Cat A and Cat B vehicles cannot be retained for road use. The salvage rules forbid Cat A from any disposition other than crushing, and Cat B from retaining the body shell. A claimant who wishes to keep parts of a Cat B vehicle (the engine, for example) can negotiate that within the settlement, but the body must be destroyed.

GAP insurance and the finance shortfall

Guaranteed Asset Protection insurance covers the shortfall between the at-fault insurer’s market-value settlement and either (a) the original invoice price of the vehicle (‘Return-to-Invoice GAP’) or (b) the outstanding finance balance (‘Finance GAP’). It is a separately-purchased insurance product, regulated under the Financial Conduct Authority’s general insurance rules and (since 31 December 2024) subject to enhanced FCA scrutiny over value-for-money following the FCA’s temporary intervention in mid-2024.

GAP matters most for new and nearly-new cars on finance. A new car loses 15-25% of its value the moment it leaves the forecourt, and another 15-20% in the first year. A vehicle written off in year one on a PCP or HP agreement can leave the keeper owing thousands more on the finance than the at-fault insurer pays out. Without GAP, the keeper carries that shortfall personally; with GAP, the policy responds. GAP premiums are usually £100-£300 for a typical car, much higher for premium and luxury models.

For lease vehicles (PCH, business lease) the position is different. The lessor owns the vehicle and the at-fault insurer pays the lessor directly. The lessee may face early termination charges under the lease - typically a percentage of the outstanding rentals - and these are not covered by the at-fault insurer (because the lessee did not own the vehicle and so had no proprietary loss). A separate ‘Lease GAP’ product covers these termination charges; it is not the same as Return-to-Invoice GAP.

Other recoverable heads of loss alongside the market value

The market-value settlement is not the only recoverable head of loss on a write-off claim. The standard additions are: the insurance excess paid to your own insurer if you claimed under comprehensive; pro-rata refund of road tax (£10-£600 depending on the rate and remaining months); pro-rata refund of any extended warranty (typically £100-£500 unused premium); pro-rata refund of any service plan (£50-£300 unused); cost of personal items in the vehicle (sat-nav, dashcam, baby seat, parcels, shopping, sports kit, work tools).

Like-for-like replacement vehicle for the period between the accident and the settlement - typically 4-8 weeks on a contested-valuation file - is recoverable under Lagden v O’Connor [2003] UKHL 64. See our credit hire page. The replacement should match the written-off vehicle by class, body type, drivetrain, equipment level and (where applicable) ULEZ / CAZ compliance. See also loss of use claim for the underlying principle.

Consequential losses include taxi fares, public transport, missed business bookings, child-care drop-off transport and time off work for collection of personal items from the salvage yard. Diminished value on retained-salvage vehicles is a separate head of loss - see our diminished value claim page. Personal injury claims are pursued separately on the OIC portal or the pre-action protocol track, introduced to a panel solicitor only with your explicit consent.

The Financial Ombudsman Service and how it handles undervaluation

Where the at-fault insurer’s settlement offer remains materially below the supportable market value after negotiation, the Financial Ombudsman Service (FOS) is the consumer-side dispute resolution route for retail claimants. The FOS has jurisdiction over consumer complaints against FCA-regulated insurers under the Financial Services and Markets Act 2000 framework, with awards of up to £430,000 (for complaints about acts or omissions on or after 1 April 2024). A claimant can refer a disputed total-loss valuation to the FOS once the insurer has issued its final response or eight weeks have passed without a final response.

The FOS approach to undervaluation cases is well established. The Ombudsman expects the insurer to make a fair and reasonable valuation based on the appropriate trade publication retail figures (Glass’s, CAP, Autotrader retail comparables) and to take into account documented service history, optional extras, recent improvements and the vehicle’s overall condition. Where the insurer’s offer is below the average of two or more reasonable trade-publication retail figures, the Ombudsman routinely awards an uplift to that average plus consequential losses (interest, distress and inconvenience awards typically £100-£500). The FOS database is publicly searchable for precedents on similar vehicles.

The FOS route is most useful for solo claimants without a non-fault accident management company behind them, because the FOS handles the complaint directly with the consumer. For files where an accident management company is involved, the negotiation usually settles before the FOS becomes necessary because the company’s engineer’s report and counter-valuation evidence carries the same weight in negotiation as the FOS would attach to it. The mere threat of an FOS referral focuses insurer minds on most disputed-valuation files.

Pre-existing damage, previous claims and the valuation reduction

Insurers routinely look for pre-existing damage as a basis to reduce the market value. The argument is that a vehicle with pre-collision damage was already worth less than the comparables, and the at-fault insurer should pay only the value of the vehicle in the condition it was actually in immediately before the accident. The argument is sound in principle but often pushed beyond the evidence. Minor cosmetic issues (kerb scuffs, light dents, paint chips, a worn driver’s seat) do not move the market value materially on a mainstream vehicle. Major pre-existing damage (a previous accident with a Cat S or Cat N marker, a sticker on the V5C) does.

The evidence on pre-existing damage comes from the engineer’s inspection of the vehicle, the HPI / AutoCheck history, the MOT history (which shows advisories and failures going back years), and any service history. Where the insurer alleges pre-existing damage, the claimant’s engineer responds by examining the specific allegations and presenting the contrary evidence - usually that the alleged damage either does not exist on the vehicle, is not material to the market value, or has been priced into the comparables already. The negotiation is granular and engineer-led; the figures move case by case.

Previous claims are a particular sensitivity. An HPI report showing a previous accident - even one fully repaired and settled - is taken into account by the market and by the insurer when calculating the pre-accident value. A vehicle with a clean HPI history is worth more than the same vehicle with a recorded prior accident. The diminished value head we explored earlier captures the same phenomenon from the other direction: the at-fault driver’s negligence has now added a recorded accident to the HPI history, and that recorded accident will reduce the resale value going forward.

CityGrip’s role on a write-off claim

CityGrip coordinates the entire property-damage side of a non-fault write-off claim. The workflow is: recovery of the damaged vehicle from the scene to secure storage at recoverable rates; an independent engineer’s inspection to determine the salvage category, the pre-accident market value and the retained-salvage economics; counter-valuation evidence build (retail comparables, service history, Glass’s and CAP figures, optional-extras list, MOT and detail evidence); negotiation with the at-fault insurer to push the settlement from the opening offer to a fair figure; like-for-like replacement vehicle during the negotiation period; and resolution of all consequential heads of loss.

We do not give legal advice and we do not run personal injury claims. With your explicit consent, we introduce injury claims to an SRA-regulated panel solicitor on disclosed referral terms. The funding model, the firm’s identity and any deduction from settlement are explained before any retainer is signed. Related guides: diminished value claim, credit hire, engineer inspection, who pays for what, loss of use claim.