How do I work out what my car is actually worth?
The three different values every car has at once, why online instant valuations are systematically low, and how to build a defensible figure from real advertisements.
- Difficulty
- beginner
- Time
- 20 min
- Read
- 5 min
Short answer
A car has three values simultaneously: what a dealer would sell it for, what a dealer would give you in part exchange, and what you could get privately — and the gap between the highest and lowest is often thousands. Build your own figure from currently advertised cars of the same model, year, engine, trim and mileage, then adjust for condition, history and specification. Instant online valuations are quotes to buy, not valuations, and they sit at the bottom of the range.
The reason people find car valuation confusing is that they are looking for a single number and there is not one. A car is worth different amounts depending on who is buying, how quickly, and what risk they are taking on. A dealer buying yours in part exchange has to prepare it, warrant it, finance it while it sits, and make a margin, so they will always be well below what they will later sell it for. An online buying service has to do the same and does it at volume with no negotiation. A private buyer pays more because they get no warranty and no comeback. All three are correct figures for their own transaction.
Step by step
- Establish exactly what you have.Model, engine, transmission, trim level, year and registration plate, mileage, and factory-fitted options. Trim level and options make a real difference on the same car — a high-specification version can be worth substantially more, and people routinely undersell theirs by advertising it generically.
- Search live advertisements, not valuation tools.Look at the major classified sites for the same specification within a reasonable radius, and record asking prices, mileages and dates. Six to ten genuinely comparable cars gives you a real market picture. This is what a dealer does and it is what an insurer responds to.
- Separate dealer prices from private ones.Dealer advertisements sit above private ones for the same car, because they include warranty, preparation and comeback. When pricing your own private sale, look at private adverts; when arguing an insurance valuation, dealer adverts are the correct comparison because that is what replacement would cost.
- Adjust honestly for condition.Kerbed alloys, a scuffed bumper, worn tyres, a missing service stamp, a short MOT and a tired interior each move the number. Be as harsh with your own car as a buyer will be. A car that needs a thousand pounds spending is worth a thousand pounds less, not slightly less.
- Value the things buyers actually pay for.Full service history with invoices, a recently done cambelt or clutch, a fresh long MOT, two keys, low ownership count, and no advisories. These reduce the buyer's perceived risk, which is what they are really pricing. Two keys in particular is worth more than most people realise.
- Treat instant online offers as a floor.The online buying services give you a guaranteed, fast, no-hassle price, and you are paying for that convenience with money. Get one anyway — it is free and it establishes the bottom of your range, which is genuinely useful information when negotiating with a dealer.
- Get a part-exchange figure separately.Ask two or three dealers what they would allow against a specific car. Watch for the figure being inflated while the discount on the new car shrinks; ask for the price of the new car with no part exchange first, so you can see both numbers independently.
- Reality-test the private figure.Advertise at a considered price and see what happens in the first week. No enquiries at all means the price is wrong, not that the market is quiet. Several enquiries immediately means you have priced under the market.
- Account for what is not in the guides.Seasonality — convertibles in spring, four-wheel drive in autumn — a private registration, a non-standard modification, an unusual colour, a write-off marker, and an outstanding recall all move the number and none is in an automated valuation.
Common mistakes
- Valuing the car by what you owe on it — The finance balance and the market value are unconnected. Discovering they differ is negative equity, which is a real situation to plan for, but it does not make the car worth more.
- Relying on a single instant online valuation — It is an offer to buy at a price that guarantees the buyer a margin. Useful as a floor, misleading as a valuation, and it will always be below what the car is worth privately.
If it doesn't work
Online valuations vary wildly between sites
Cause: Each is quoting for a different transaction — Fix: Compare like with like. A trade guide retail figure, a part-exchange figure and an instant purchase offer are three different numbers and none of them is wrong.
No enquiries after a week of advertising
Cause: Priced above the market, or a poor advert — Fix: Compare your advert against the ones that are selling — photographs, detail, honesty about faults. Then adjust the price. The catalogue's guide on selling privately covers the advert itself.
Dealer offers far less than the online buying service
Cause: They may not want that car, or the discount is hidden elsewhere in the deal — Fix: Get the price of the new car with no part exchange, then decide separately how to dispose of the old one. Keeping the two negotiations apart is the single most useful tactic.
Car has a category S or N marker
Cause: A recorded write-off — Fix: It reduces value substantially and permanently, and it must be disclosed. Search for other cars with the same marker to see the discount the market actually applies.
Modified car nobody seems to value
Cause: Modifications generally reduce value to the mainstream buyer — Fix: Either return it to standard or accept a smaller, more specialist audience and a longer sale. Almost no modification returns its cost.
Questions people ask
Why is the trade-in offer so much lower than the advertised price?
The dealer has to inspect, prepare and often repair the car, provide a warranty, finance it while it sits on the forecourt for weeks, and make a margin. That gap is their business, not an insult, and it is why a private sale nets more if you are willing to do the work.
Does mileage or age matter more?
Both, and they interact. A very low-mileage older car is not straightforwardly worth more — buyers worry about perished seals, unused brakes and short-journey wear. Average mileage for the age, with a full history, is usually the sweet spot.
How much is a full service history worth?
More than almost anything else you can control, because it removes the buyer's biggest fear, which is what the car will cost them in the first year. It is also one of the few claims a buyer can verify, through invoices and the online MOT record.