Why Are Car Valuations So Low? 5 Things the Figure Misses
Most car valuations look low because the figure you see is a trade or part-exchange price, not what a private buyer would pay. When Auto Express compared market estimates for 1,000 cars, the private sale price beat the part-exchange price by £407 on average, almost 4% of the selling price. Online tools also assume standard mileage and equipment, instant buyers re-price the car at inspection and take a fee, and an insurer pays the market value of your car, not the figure you guessed on the application form.
This guide explains the five gaps between the number on the screen and what your car is actually worth, which figure fits which purpose, and when you need a written valuation instead of a quick estimate.
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1. Which price is the online valuation showing you?
Usually not the one you expect. A car has several prices at the same moment, and each tool shows one or more of them. Parkers, which works with Cap HPI, gives a private value, "the typical price you'll pay for a car in a private sale", and a dealer price, for a car with a warranty and no major mechanical, bodywork or paint issues. Car.co.uk shows private, trade, part-exchange and auction values. If you compare a part-exchange figure with an advert on a dealer forecourt, the valuation will always look low.
| Figure | What it means | Compare it with |
|---|---|---|
| Dealer (retail) price | What a dealer asks for a car prepared for sale, with a warranty | Dealer adverts for the same model, age and mileage |
| Private sale value | What a private buyer typically pays a private seller | Private adverts for the same specification |
| Part-exchange value | What a dealer offers against a car they sell you | Other part-exchange offers, and the private value (section 2) |
| Trade or instant offer | What a buyer such as an online car buying service pays | Other instant offers, after inspection and fees (sections 3 and 4) |
Definitions from Parkers and Car.co.uk, read on 5 November 2026.
2. Why is a part-exchange offer lower than a private sale?
Because the dealer is buying a car to sell again. In a study published on 24 September 2024, Auto Express took a random sample of 1,000 registrations, asked the market data company UKVD for its estimates of the part-exchange and private sale prices, and found an average difference of £407 in favour of the private sale, almost 4% of the selling price. It also found cases the other way round: high-demand versions of mainstream models that a dealer can sell quickly can sometimes get a marginally better price as a part exchange. The gap is the price of not advertising the car, answering calls and dealing with buyers yourself.
3. Why does an instant offer drop at the inspection?
Because the online figure is not an offer. The terms of webuyanycar, read on 5 November 2026, say the online valuation "is not an offer by us to purchase the Car", that they "always carry out a physical inspection" before agreeing to buy, and that if the inspection finds something that affects the assumptions behind the online figure, the price "is likely to differ from the Online Valuation". The online valuation is guaranteed for 4 days, but it was built on the details you entered. Anything the inspection finds that those details did not show moves the price.
Selling, insuring, dividing or declaring a car? A written market valuation sets out the comparable cars behind the figure, so the other side can see where it comes from.
Get a price for a written car valuationYour price is confirmed in writing before any work begins.
4. What comes off an instant offer before you are paid?
A transaction fee, at least with the service whose terms we read. The fee depends on the final price, so it is charged on the figure after the inspection:
| Final price | Transaction fee |
|---|---|
| Below £149.99 | None |
| £150 to £3,999.99 | £49.99 |
| £4,000 to £6,999.99 | £74.99 |
| £7,000 to £9,999.99 | £84.99 |
| £10,000 to £19,999.99 | £99.99 |
| £20,000 or more | £124.99 |
Source: webuyanycar terms and conditions, read on 5 November 2026. The terms say they periodically trial different fees and show the fee before you sell.
Worked example with figures we made up: a car that ends at £5,000 after inspection sits in the £4,000 to £6,999.99 band, so the fee is £74.99 and you receive £4,925.01. The headline number and the money in your account are two different figures.
5. Why does the insurer's valuation look low?
Because an insurer pays the market value, and that is often not the number you had in mind. The Financial Ombudsman Service says that after a write-off the insurer will usually pay "the amount your vehicle would have been worth just before it was stolen or damaged". The value you estimated on the application form "isn't the amount your insurer would actually have to pay out in a claim". To judge an offer, the Ombudsman looks at the specialist motor valuation guides and any other evidence. If the guides vary a lot, it looks for adverts or an expert's opinion, and if the valuation is unfair it tells the insurer to move to the highest guide figure or to the value the other evidence supports, whichever is fairest. Our guide on which valuation guides insurers use covers this in detail.
Which cars do quick valuations get wrong most often?
The ones that are not average. Parkers says its free valuation is based on a standard mileage and equipment tally and covers UK registered cars from 2006 (56 plate) onwards, so an older car is outside it altogether. The Ombudsman says the valuation guides do not cover some vehicles, including vehicles over 20 years old, and that a modification such as a spoiler or racing exhaust may not raise the overall market value, because it can put some buyers off. It also accepts a deduction for left-hand drive or an imported right-hand-drive car, as long as the insurer shows evidence that the deduction is fair. For a classic, an import, a modified car or a high mileage example, a quick tool is guessing from cars that are not like yours.
When do you need a figure you can defend?
When someone else has to accept it. An executor, HMRC, a former partner or an insurer will each want to know where your number comes from. For inheritance tax, the HMRC IHT400 notes say you need the open market value at the date of death, "the realistic selling price", not an insurance or replacement value, and advise a professional valuation if an item may be worth more than £1,500 or you are not sure. Personal items, cars included, go on form IHT407. The same logic applies elsewhere: a quick estimate tells you roughly where you stand, while a written report shows the comparable cars, the condition and the date the figure applies to. Our guides on why instant online valuations don't work for HMRC or probate and what makes a valuation report defensible go further.
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Frequently asked questions
Is it worth selling privately instead of part exchanging?
On average, yes, but not always by much. In market estimates for a random sample of 1,000 cars, Auto Express found the private sale price beat part exchange by £407, almost 4% of the selling price, while some in-demand models did marginally better as a part exchange.
Why is my online valuation different on every website?
Because each tool shows a different price (private, dealer, part-exchange or trade) and uses its own data and assumptions about mileage and equipment. Compare the same type of figure across tools, not a part-exchange figure with a retail one.
Is the value I put on my insurance form what I get after a write-off?
No. The Financial Ombudsman Service says the estimate on the application form is not the amount the insurer has to pay. The insurer pays the market value just before the loss, judged mainly on the motor valuation guides and other evidence.