Part-Exchange Is the Most Expensive Convenience in Motoring
You are sitting at a desk in a showroom. There is a printed sheet in front of you covered in numbers, and only one of them genuinely matters: the amount you have to pay to drive away in the new car.
That figure is doing something clever. It is two entirely separate negotiations wearing a single coat.
Handing your old car to the dealer who is selling you the new one is the most convenient way to change cars. It is also, structurally, the way that gives you the least leverage you will ever have over what your car is worth. Those two facts are related, and almost nobody has them explained before they sign.
One number, two deals
The cost to change is the price of the new car minus what they are giving you for the old one. The dealer controls both halves. You see only the total.
Which means a generous-sounding discount on the new car can be quietly funded by a weaker number on yours, and the sheet in front of you will look exactly the same either way. You are not being deceived. You are simply being shown the one figure that makes the two halves impossible to separate.
Then there is the second problem, which is bigger. In a part-exchange, exactly one person is bidding on your car. It is the person sitting opposite you, who knows you would quite like to go home in the new one today.
No auction on earth produces its best price with a single bidder in the room.
💷 Get a valuation before you walk into a showroom
What a car is worth depends entirely on who is bidding
There is no fixed value for a used car. There is only what somebody will pay for it this week, and that varies more than people expect.
A dealer with a gap on the forecourt where your exact model should be will pay more than one who already has three of them and cannot shift the second. A specialist who knows the model sells well in their area will pay more than a general dealer treating it as trade stock. Same car, same mileage, same week, meaningfully different numbers.
The only way to find the top of that range is to let more than one of them see it.
How the auction route actually works
This is the gap Carwow’s sell-my-car service is built to fill, and the mechanics are worth knowing whether or not you use it.
You enter your registration and get a free valuation. You complete the listing with details and photos, and you set a reserve price, which is your floor. The car is then put in front of Carwow’s dealer network, which the company puts at more than 6,000 dealers, who bid on it in daily auctions. If a dealer wins, they arrange collection from your home at a time that suits you, and payment can be made on the day the car is picked up.
Carwow states the service is free to sell through, and is direct enough about it to name competitors, saying that unlike sites such as WeBuyAnyCar and Motorway it is always completely free. If your car does not sell first time, it gets two additional days of visibility. A sale can happen inside 24 hours, though that depends on demand for your particular car rather than on anything you control.
A few conditions are worth checking before you start. Former service vehicles such as ex-taxis and ambulances are excluded, as are insurance write-offs. Outstanding finance is not a problem, but you will need a settlement letter from your lender.
🔑 Set a reserve and let dealers bid against each other
If it is free, who is paying?
Worth asking of any service like this, and Carwow answers it openly. The company is authorised and regulated by the Financial Conduct Authority, operates as a credit broker, and earns commission from dealer partners and introductions rather than charging the people using the site. Dealers pay for access to buyers and sellers. That is the business.
One other thing is worth knowing, because it is the sort of detail that changes how you read things. Carwow now owns Autovia, which brought Auto Express, Carbuyer, evo and DrivingElectric under the same roof as the marketplace. So the review you are reading and the platform you are buying through can belong to the same company.
That is not a scandal, and those titles have long editorial histories. It is simply a fact worth holding in your head, the same way you would with any publication that also sells you the thing it is reviewing. Including, for the avoidance of doubt, articles like this one.
On scale, Carwow says it has helped more than 2.5 million people find, buy or sell a car since 2011, and that one in every ten privately registered new cars in the UK is bought through its site. Those are the company’s own figures rather than independently audited ones, which is worth noting even though the direction of travel is not really in dispute.
📈 Check today’s value on your reg
When part-exchange is still the right call
There is a genuine case for it, and pretending otherwise would be dishonest.
If you need your current car right up until the moment you collect the new one, and you have no second vehicle and no willing lift, part-exchange solves a real logistics problem. Selling separately means your car leaves when the winning dealer collects it, which may not line up neatly with delivery of the new one.
If the car is worth very little, the spread between a single offer and a competitive one shrinks, and at some point the difference stops justifying the effort.
If the car falls into one of the excluded categories, an ex-taxi or a recorded write-off, that route is closed anyway and you are into specialist buyers.
And if you would honestly rather spend one afternoon less on this and accept a lower number, that is a perfectly rational trade. The only thing worth insisting on is that you make it deliberately, knowing roughly what it costs, rather than discovering afterwards that convenience had a price nobody quoted.
The sequence that costs least
Five steps, in this order.
Value the old car first, before you are sitting opposite anyone. Walking in with a number in your pocket changes the entire conversation.
Negotiate the new car on its own price. Ask for the figure with no part-exchange involved at all. Settle that before the old car enters the discussion.
Then let the dealer try to beat your best standing offer. Sometimes they will, particularly if they want your car specifically. Now you can actually tell.
Set a realistic reserve, not an aspirational one. A reserve above what the market will pay just means no sale and a wasted week.
Sort the finance paperwork early if there is any outstanding. The settlement letter takes a few days and is the most common cause of a stalled sale.
None of this is complicated. It is mostly a matter of refusing to let two decisions be collapsed into one number, and giving more than one person the chance to bid on something you own.
