Private sale vs part-exchange vs instant buy: which is right for you?
On the same car, choosing the right sale route can be worth over £2,000 of your money. Here is a realistic head-to-head so you can pick the one that fits your life.
Ballpark price comparison
For a representative well-maintained 2019 VW Golf 1.5 TSI with average mileage, here are the kinds of figures we have seen in recent UK market data:
- Private sale (Auto Trader): £11,200 to £11,800
- Motorway auction-style: £10,300 to £10,800
- Carwow Sell: £10,000 to £10,500
- WeBuyAnyCar online quote: £9,700 to £10,100 (often revised down at the branch)
- Dealer part-exchange: £9,500 to £10,000
That is a gap of around £1,500 to £2,300 between the best and worst routes for the same car. Every car is different, but the shape of the spread is consistent across almost all makes and models in the UK.
Private sale
Best for: drivers with time, patience and a decent phone camera, who are happy to deal with strangers.
Typical price: baseline, highest of the three routes.
Time to sell: two to six weeks from listing to completion.
Effort: high. Writing a listing, taking photos, cleaning the car, responding to messages, hosting viewings, arranging test drives, handling payment.
Risk: moderate. The most common risks are time-wasters, fraudulent bank transfers, cheque bounces, and post-sale disputes. All manageable if you know the rules.
Platforms: Auto Trader (paid), Facebook Marketplace (free), eBay Motors (listing fee), Gumtree (limited free).
In practice, most UK private sales complete within three weeks if the listing is well priced and well presented. The biggest time drain is replying to time-wasters: people asking questions the listing already answered, lowballers trying 40 percent off on day one, and no-shows for arranged viewings. A clear listing and firm pricing reduces this dramatically.
Instant buy (Motorway / WBAC / Carwow Sell)
Best for: drivers who need the car gone this week, or who value their time at more than the price gap.
Typical price: 85 to 95 percent of private sale value.
Time to sell: 24 to 72 hours from quote to payment.
Effort: low. Enter the reg, upload photos (or drive to a branch), accept a quote, hand over keys.
Risk: low financially. The main "risk" is the initial online quote being revised down after inspection, almost standard with WeBuyAnyCar.
Among UK instant buyers in 2026, Motorway typically pays the most because the car goes out to thousands of dealer buyers who bid competitively. WBAC pays less but is fastest for people who live near one of their many UK branches. Carwow Sell sits in between. Cazoo and Cinch buy on similar terms to WBAC, with slightly different pickup logistics.
Pro tip: always compare the offers, they can vary by £400 to £1,200 on the same car. moValue does this automatically as part of every valuation.
Part-exchange
Best for: drivers already buying a newer car from a dealer, where the convenience of a one-stop transaction is worth money.
Typical price: 75 to 85 percent of private sale, occasionally higher if the dealer is negotiating the new-car price and is willing to absorb margin.
Time to sell: same day as the new car purchase.
Effort: minimal.
Risk: the bundling risk we mentioned earlier: the dealer can offer a great trade-in price while inflating the new car price. Never agree a part-exchange before you have the firm cash price of the new car separately.
Part-exchange is only the right answer if the dealer's trade-in offer, combined with a fair cash price on the new car, beats what you could do by selling the old car to an instant buyer and negotiating the new purchase independently. In 2026, that is the case maybe 30 percent of the time in our experience. The rest of the time, the dealer is quietly hoping you do not compare.
Side-by-side decision table
| Factor | Private | Instant buy | Part-exchange |
|---|---|---|---|
| Price (rel. to private) | 100% | 85–95% | 75–85% |
| Time to complete | 2–6 weeks | 24–72 hours | Same day |
| Effort required | High | Low | Minimal |
| Payment risk | Moderate | Low | Low |
| Quote stability | Negotiable | Often revised | Tied to new car |
| Needs physical inspection | Yes | Usually yes | Yes |
A simple decision rule
Pick private sale if:
- You have three or more weeks
- Your car is worth £6,000+ (below this, the gap between private and instant buy is usually smaller than the effort)
- You are comfortable writing a clear listing and meeting a couple of buyers
Pick instant buy if:
- You need the money in the next seven days
- Your car is over 10 years old or has very high mileage (harder to sell privately, smaller price gap)
- You genuinely do not want the hassle, and the £500–£1,500 is worth less to you than your Saturdays
Pick part-exchange if:
- You have already chosen the new car, priced it independently, and the bundled deal beats the instant-buy figure by enough to cover your time
- Or, the dealer is clearing the forecourt for a quarter-end target and offering unusually generous trade-ins
Whatever you pick, see all three first
The mistake we see most often is drivers picking a route without ever seeing the numbers for the others. moValue was built so you can see private, part-exchange and multiple instant-buy figures for your car in under a minute, side by side. You can still pick the convenience of an instant buy, but you will pick it knowing what you are leaving on the table.