Car written off and the payout looks low? How to dispute the valuation

If your car has been written off and the insurer's offer looks light, do not accept it as the market speaking. The valuation should reflect your car's fair market value immediately before the loss - and the Financial Ombudsman Service, which handles these disputes in volume, expects insurers to base valuations on the motor trade guides and to justify any offer below the highest guide figure.

First offers are frequently improvable. This guide explains how the valuation should be built, where insurers cut corners, and how to run the challenge.

Key takeaways

• The measure is fair market value just before the loss - the cost to replace your car with an equivalent one, not a quick-sale or trade-in price.
• The Ombudsman's approach centres on the motor trade guides (CAP, Glass's, Percayso, AutoTrader) - and insurers offering below the highest guide value need to evidence why.
• Inputs drive outputs: wrong mileage, trim or condition in the guide lookup produces a wrong valuation. Check them first.
• You can usually accept an interim payment and keep disputing the shortfall - in writing.
• Valuation disputes escalate to the Financial Ombudsman Service, which is free.

How a write-off payout is supposed to be built

When a car is a total loss, the insurer owes you the sum your policy promises - almost always its market value at the date of loss. The industry works from the trade guides, which price by make, model, year, mileage and condition.

The part worth knowing: the guides produce a range, and for years some insurers systematically picked figures at the low end. The Financial Ombudsman pushed back hard, and its published approach now is that an insurer relying on the guides should not simply pick a lower figure - if it offers less than the highest available guide valuation, it needs evidence specific to your car to justify that.

That single point reframes the negotiation. The question is not "will you increase it a bit?" but "which guides did you use, what inputs, and how do you justify sitting below the highest figure?"

Source: Financial Ombudsman Service guidance on motor insurance total-loss valuations. Last checked: 04.07.2026.

Step one: audit the inputs

Before arguing the number, check what the insurer fed into the guides:

• Mileage - a digit wrong here moves the value materially
• Exact model and trim - the difference between base and a higher trim with options is real money
• Registration date and year
• Condition - insurers often default to "average"; a full service history and fresh tyres are not average
• Recent spend - a new clutch or cambelt does not add pound-for-pound, but supports condition

Ask the insurer, in writing: which guides did you consult, on what date, with what mileage, trim and condition, and what figure did each guide return? You are entitled to understand the offer, and the answer frequently reveals the problem on its own.

Step two: build your counter-file

• Comparable adverts - genuinely comparable: same model, similar year, mileage and spec, ideally several, screenshotted with dates. Five real adverts at £9,500 beat a feeling that £8,200 is low.
• Your car's documents - service history, MOT history, receipts for recent work, photos from before the loss.
• Your own guide lookups - consumer-facing valuations help sense-check, though insurers lean on the trade versions.
• An independent engineer's or valuer's report, for higher-value disputes - a cost worth weighing against the gap you are chasing.

Step three: challenge in writing

1. State the gap plainly: the offer, what you say the fair value is, and the difference.
2. Query the methodology: guides used, inputs, and why the offer sits where it does in the range.
3. Correct the inputs with evidence.
4. Attach the comparables and documents.
5. Ask for the uplift, plus interest on the shortfall from the date of the original offer where the delay is the insurer's.

Two practical protections along the way: if you need the money, accept as an interim and dispute the balance - stating in writing that acceptance is not full and final. And keep an eye on fees stacking against you: storage charges and hire costs are pressure tools; challenge unreasonable ones as part of the complaint.

The same logic applies if the argument is about the write-off decision itself - whether the car should be a total loss at all - or the salvage category and your right to retain the vehicle. Each is a decision the insurer must justify against the policy and the numbers.

What weakens a valuation challenge

Honesty about the other side of the ledger:

• comparables that are not really comparable - different year, half the mileage, higher trim
• pre-existing damage the insurer photographed at inspection
• valuing feelings - the car's worth to you - rather than the market
• a modest gap: chasing £150 through weeks of dispute may not be worth it; chasing £1,500 usually is

When and how to escalate

If the insurer maintains its offer in a final response, or eight weeks pass, you can take the dispute to the Financial Ombudsman Service - motor valuation is one of its steady caseloads, and outcomes regularly move offers where the insurer sat below the guides without justification. The Financial Ombudsman Service is free, independent, and you keep any compensation it awards. The usual six-month window from the final response applies - check the current time limits.

For context, our analysis of published Ombudsman decisions shows insurance complaints have a distinct outcome pattern, but valuation disputes still turn on guide inputs and comparables.

For the wider playbook on disputed claims - rejections, delays and underpayment across all insurance types - see how to challenge an insurer.

How HeyRefund can help

Valuation disputes are evidence-versus-evidence: guide figures, inputs and comparables. HeyRefund helps you organise the insurer's methodology answers, your comparables and the timeline into a challenge that engages with how these disputes are actually decided.

Challenging the offer and going to the Ombudsman are free, and you keep any uplift. HeyRefund just helps you build the file that earns it.