Which trade guides are used to check a car valuation?

The main UK motor trade guides commonly referenced include CAP, Glass's, Autotrader, and Percayso. Where guides give different figures, the general approach favoured by the Financial Ombudsman is to look at all the recognised guides and lean toward the higher end when there's a genuine, fair basis for doing so, rather than automatically taking the lowest.

Can I use adverts for similar cars to challenge my insurer's valuation?

Yes. Real advertisements for directly comparable vehicles (same make, model, age, mileage, and condition) are commonly used as evidence in valuation disputes, both by insurers defending their figure and by policyholders challenging it. The strength of this evidence depends on how genuinely comparable the adverts are to your specific vehicle.

Insurance & Claims · UK

What happens if my insurer's valuation is lower than the actual damage?

Q: What happens if my insurer's valuation is lower than the actual damage?

You can dispute it. Most motor policies pay out the vehicle's 'market value' for a total loss, defined as the cost of replacing it with one of similar make, model, age, mileage and condition. Insurers are expected to reach this figure reasonably, generally using recognised trade guides, and the Financial Ombudsman Service regularly increases settlements when the evidence — other trade guides or real advertised prices for comparable cars — supports a higher valuation.

You dispute it with evidence — valuations are checked against trade guides, not accepted on trust.

Kibbo Consumer Desk · Updated September 2026 · 7 min read

You can dispute it, and doing so successfully is genuinely common. Most motor policies define your payout for a total loss as the vehicle's "market value" — the cost of replacing it with one of similar make, model, age, mileage, and condition — and insurers are expected to reach that figure reasonably, typically by checking recognised trade guides. When those guides diverge, or an insurer's figure sits noticeably below what similar cars are actually selling for, the Financial Ombudsman Service regularly requires insurers to increase their offer.

How valuations are supposed to be reached

Step	What happens
Insurer checks recognised trade guides	Commonly CAP, Glass's, Autotrader, and Percayso for motor vehicles
Guides sometimes disagree	The Ombudsman's general approach leans toward the higher, fair end of the range, rather than defaulting to the lowest
An outlier guide can be disregarded	If one guide is significantly out of step with the others, excluding it is generally considered fair
Real adverts for comparable cars	Used as supporting evidence on both sides — by insurers defending a figure and by policyholders challenging it

Critically, this isn't decided by opinion — it's a fact-checking exercise the Ombudsman conducts by comparing the insurer's figure against the same recognised sources, and increasing the settlement where the insurer's own valuation doesn't hold up against them.

Why "I can't buy a replacement for this" isn't automatically enough

It's a common and understandable frustration, but on its own, being unable to find a replacement car at the settlement figure doesn't automatically mean the valuation was unfair — the Ombudsman's role is to check whether the insurer reached its figure reasonably and in line with the policy and trade guides, not to guarantee you can replace the car easily. That said, if you can show real, comparable adverts priced meaningfully above the settlement, that's exactly the kind of concrete evidence that does move a valuation dispute in your favour.

An important intermediate step: interim payments

If your insurer has accepted your claim is valid and the total loss is genuine, but you're disputing the amount, it's considered good practice for the insurer to make an interim payment at this stage rather than making you wait for the dispute to fully resolve — since the only open question is the value, not whether you're owed anything at all.

What to do if you think your valuation is too low

Ask your insurer exactly which trade guides they used and what figures each one gave.
Independently check the same guides yourself where possible, or ask a trusted garage or dealer for a second opinion.
Gather real adverts for directly comparable vehicles — same make, model, age, mileage, and condition — as concrete supporting evidence.
If the guides disagree, point out that the fairer approach typically favours the higher end of a genuine range, not the lowest figure available.
Raise a formal complaint with the insurer if you believe their valuation doesn't hold up against this evidence.
If unresolved, escalate to the Financial Ombudsman Service, which routinely reviews exactly this type of dispute and has a well-established approach to it.

Official sources

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