Two identical cars, same fault, same money. But who sold it to you changes your position entirely. Buy from a dealer and the law gives you a proper safety net. Buy the same car privately and that net mostly isn't there. It's the single most misunderstood thing about buying used, and it's worth getting straight before you hand over money, not after the gearbox starts whining on the way home.

Buying from a dealer: the law is on your side

When you buy from a trader (a franchised dealer, an independent forecourt, even a part-time trader working from home), the Consumer Rights Act 2015 applies. It says the car must be:

  • Of satisfactory quality: sound for its age, mileage and price. Nobody expects a ten-year-old car to be perfect, but it shouldn't have faults that make it unfit to drive or that a reasonable buyer wouldn't accept at that price.
  • Fit for purpose: it does what a car is meant to do, and what you told the dealer you needed it for.
  • As described: the mileage, spec, service history and condition match what the advert and the salesperson claimed.

If it falls short, the Act gives you a clear ladder of remedies. In the first 30 days you have a short-term right to reject the car and get a full refund. After that, up to six months, the dealer gets one opportunity to repair or replace; if that fails you can reject it. And within those six months the law assumes any fault was present at the point of sale: the burden is on the dealer to prove it wasn't, not on you to prove it was. That's a genuinely powerful position, and it exists whether or not any warranty came with the car.

Why "sold as seen" usually means nothing

A dealer cannot contract out of your statutory rights. A "sold as seen", "no refunds" or "trade sale" line on the invoice does not remove the Consumer Rights Act, and any term that tries to is simply not binding. If anything, seeing that phrase on a dealer's paperwork should make you more cautious, not less; it's often a sign they're hoping you don't know where you stand. The one place it carries more weight is a private sale, and even there it can't rescue a seller who lied.

Buying privately: far less protection

Private sales are governed by a much thinner rule. The only real obligation on a private seller is that the car must be as described: misrepresent the mileage, the history or a known fault and you have a claim. But the big protections simply don't apply: there's no satisfactory-quality test, no fitness-for-purpose test, no 30-day right to reject. The legal principle is caveat emptor, buyer beware. If you didn't ask, and the seller didn't lie, a fault you find next week is your problem.

That's not a reason to avoid private sellers; private cars are usually cheaper, and plenty of them are honestly sold by people who've simply looked after the car. It just means all the checking falls on you before you pay, because there's no comeback afterwards. Verify what the seller tells you rather than taking it on trust: confirm the MOT record and mileage trail, check the paperwork lines up, and satisfy yourself the car is what it claims to be. A full history report does exactly that job (MOT history, mileage, tax status and spec pulled from the DVLA record), and on a private buy it's doing the work the law would otherwise have done for you.

Where auctions and online sellers sit

Auctions are their own world: most cars are sold with limited or no return rights, and the catalogue terms spell out exactly what you're bidding under; read them before the hammer falls, as our auction guide explains. Buying from a distance-selling trader online usually adds a 14-day cancellation right on top of your normal consumer rights, but buying privately through a classified site gives you no more protection than any other private sale: the platform is just where you found each other, not a party to the deal.

The practical takeaway

Decide how much the protection is worth to you and buy accordingly. A dealer costs more, and part of what you're paying for is that legal safety net and someone to go back to when things go wrong. A private seller is cheaper, but you're buying the car on your own judgement with little recourse, so the checks have to be thorough. Either way, the more you verify up front (history, MOT, paperwork), the less you're relying on rights you hope you'll never have to use. On a private car especially, a few minutes with a free check and a full report is the closest thing you'll get to the protection a dealer would have owed you.