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Part exchange vs sell privately UK — which makes you more money?

Selling your old car the wrong way costs the average UK seller £800-£1,500. Part exchange is the easy option but you'll get the lowest price. Private sale is the highest-payout option but takes 2-4 weekends of your time. Here's the maths so you can decide what your time is worth.

SB Written by Salah Baaziz · Updated · Editorial standards

The £ difference (typical)

For a £10,000 car (private market value):

Part exchange: Dealer offers £7,500-£8,000. They sell it for £10,500-£11,000 after a service and a wash.

WeBuyAnyCar / Motorway: £8,500-£9,000. Quick, no haggling. Mid-point.

Private sale: £9,500-£10,000. Best price; takes most effort.

The gap between private and PX is typically £1,500-£2,000 for cars in this range. Bigger gap for premium cars; smaller for cars under £4k.

When to part-exchange

You're buying from a dealer anyway. Convenience matters; the same garage takes your car.

You have negative equity on finance. Dealers can roll it into the new finance (you still pay it; just deferred).

Your car has issues you don't want to disclose to a private buyer. Dealers are pros — they're harder to come back on.

Your car is under £3k — the £ gap to private is small and not worth the hassle.

You don't have time. Two weekends of viewings is genuinely a lot.

When to sell privately

Your car is £6k+ and you have a clean history. Maximum upside.

You have flexibility on when to sell. Private sale takes 1-6 weeks.

You're confident dealing with strangers. Some buyers are tedious.

You can photograph the car well. Bad photos lose £500.

You have a service history binder. Adds 5-10% to private value.

For private sales, list on AutoTrader, eBay Motors, and Facebook Marketplace. Free or low-cost listings on each.

WeBuyAnyCar / Motorway — the middle option

Motorway is now the better of the two. Online auction model — dealers bid, you get the highest. Typically gets £500-£1,000 more than WBAC for the same car.

WeBuyAnyCar is more aggressive on price reductions at the inspection. The 'instant' quote is often 10-15% above what they'll actually pay.

Get quotes from both as part of any sale process. They're useful as a floor — if a dealer's PX is below WBAC/Motorway, you know the dealer is lowballing.

The negotiation play

Get a WBAC quote OR Motorway offer BEFORE you negotiate the PX with a dealer.

If the dealer offers PX = £7,500 and Motorway will give £9,000, you have two options:

1. Sell to Motorway, then buy the new car with the cash. Net +£1,500.
2. Show the dealer the Motorway offer and ask them to match. Sometimes they will.

If the dealer won't match — sell privately or to Motorway and buy from a different dealer.

See our negotiation guide.

Frequently asked questions

How long does a private car sale take in the UK?+
For a fairly-priced popular car: 1-3 weeks. For something more niche or overpriced: 1-3 months. Price under the median for your model and you'll sell in a week.
Is selling to WeBuyAnyCar a rip-off?+
Not exactly — they pay 10-15% below private but offer same-day cash. For some sellers that's worth it. Always get a Motorway quote alongside for comparison.
Can I sell a car that still has outstanding finance?+
Yes but it's complex. You must settle the finance before transferring ownership. Most buyers won't buy if there's outstanding finance. Dealers and Motorway/WBAC can handle the settlement as part of the purchase.
Do dealers really need to know my car has been written off?+
You must legally disclose any write-off category. If the buyer discovers it later, they can rescind the sale and you may face fraud charges.
What's the highest-payoff way to sell a £20k+ car?+
Specialist platforms: Collecting Cars, The Market by Bonhams, or private treaty via a known marque specialist. These get above-market prices for the right cars. Standard private sale on AutoTrader is also fine.