What to look for in a used family car
Published 20 October 2026 · reviewed 20 October 2026
In one paragraph
Start with the boot, the back seats and the child-seat points, then read the car's MOT history for the same fault coming back, the service record and the tyres. A used family car has to fit your pram and your passengers before anything else. Every ONECARS car is checked on 34 points by our own workshop.
A family car has a harder job than any other car you will buy. It has to carry people who did not choose it, in weather nobody chose, with a boot full of things that will not fit anywhere else. So the things worth checking are not the things in the advert.
Here is the order we would check them in, and it starts with a tape measure rather than a test drive.
How much boot space does a used family car need?
Measure what you actually carry, then measure the boot — because the figure in a brochure is the boot filled to the roof, not the boot with a parcel shelf in and a buggy going in sideways. Take your pram to the viewing and put it in. If it only goes in folded flat with the parcel shelf out, you have learned something no spec sheet would have told you.
Look for a flat load lip, a false floor you can lift out, and back seats that fold without having to take the headrests off. On an estate or an MPV, check the boot with the third row up as well as down. Every ONECARS car page carries the car's photographs and its full spec, so you can do most of this before you drive over.
Will child seats fit across the back seat?
Bring the seats you already own and try them in the car, because the only test that counts is your seat in that car. Check where the Isofix points are, whether you can reach the belt buckles with a seat fitted, and whether a rear-facing seat forces the front passenger seat so far forward that nobody can sit in it.
Then check the boring part: can a child open the door, climb in and do their own belt? A car that makes the school run a two-adult job is the wrong car, however good it looks.
What should I look at in a used family car's MOT history?
Look for the same thing failing twice, because a fault that comes back is telling you about the car, not about one bad day. Anyone can check a vehicle's MOT history free on GOV.UK with the registration number: every test result, the advisories, the failures and the mileage recorded at each test.
What to read it for:
- the same item advised year after year — something nobody has got to the bottom of
- mileage that does not climb steadily
- gaps with no test at all
- corrosion advisories, which matter more on a car that carries a family
Every ONECARS car page old enough to have been tested shows that MOT history from the DVSA, test by test, with the mileage at each test, on the page with the photographs. There is a longer guide at /read/guides/how-to-check-a-used-cars-mot-history.
Does a bigger family car cost more to tax?
Usually yes, and how it is worked out depends on when the car was first registered. For a car first registered between 1 March 2001 and 31 March 2017, vehicle tax is set by its CO2 emissions band — so two cars the same size can sit in different bands. For a car registered from 1 April 2017 it is a standard yearly rate instead, with an extra charge for five years if the list price when new was over the threshold.
That is worth five minutes before you fall for a car, not after. We have written it up at /read/costs/what-makes-a-used-car-cheap-to-tax and the running-cost side at /read/costs/what-makes-a-used-car-cheap-to-run.
Is a seven-seater worth it for a family of five?
Only if you will use the back two seats often enough to live with the compromises the rest of the time. A seven-seater gives you the school-trip seats and the grandparents seats, and takes away boot space whenever they are up, along with a bigger car to park in a Wrexham side street.
A family of five who need three across the back, every day, are often better served by a wide-backed estate or a mid-size MPV than by a big seven-seater. If the sixth and seventh seats earn their keep, something like this 2008 Kia Sedona at £1,996 is the shape that does it; if they would not, a hatchback like this 2012 Vauxhall Astra at £1,295 is less car to run and less car to park.
What should I look for on the test drive?
Drive it the way your family will use it, not the way a test drive usually goes. That means a cold start if you can, a hill, a speed bump, and a stretch of dual carriageway with the radio off so you can hear the car.
Listen for a knock over bumps with weight in the back, feel whether the brakes pull, check that the air conditioning blows cold and that the rear windows and child locks all work. Sit in the back for a minute — it is where your passengers will spend the journey. There is a fuller checklist at /read/guides/how-to-test-drive-a-used-car and a viewing list at /read/guides/what-to-check-when-viewing-a-used-car.
What does ONECARS do to a family car before it is sold?
Every car we sell is checked on 34 points by ONEFIX, our own workshop on the same site at Plas Acton in Wrexham, and the list of those 34 points is published at /how-we-check-our-cars. Anything that needs doing is done by ONEFIX before the car is handed over — that rule sits in our own system rather than in a sales promise.
It matters more on a family car than on anything else we sell, because the car has to work on a Monday morning with three people depending on it. And because the workshop is next door, ONEFIX is also who services, repairs and MOTs the car afterwards — the same people who checked it in the first place.
Every car also comes with a free three-month warranty on the engine and gearbox, up to 2,500 miles, with the repairs done by ONEFIX on site; longer paid cover is available. There is more at /guides/what-our-warranty-covers.
Can I hold a car while I measure the boot, and change my mind?
Yes. A reservation holds the car for fourteen days, and within those fourteen days you can cancel for any reason and get the fee back in full; go ahead and it comes off the price instead. That is enough time to borrow the pram, try the child seats and talk it over at home — see /read/guides/how-a-used-car-reservation-works.
If you buy online and have the car delivered, that is a distance sale, and you have fourteen days from delivery to change your mind and return it. Delivery is free within 20 miles of Plas Acton on weekdays, in hourly slots, with the car checked, valeted and fuelled before it leaves us. There is no admin fee on top of anything: the price shown is the price paid.
Where do I come and look?
Come to Plas Acton Garage, 282 Chester Road, Wrexham LL12 8DU, Monday to Friday 9 to 5 or Saturday 10 to 4, for a viewing by appointment — and there is a second forecourt at Ruyton near Shrewsbury. Bring the pram and the child seats. You can see what is on the forecourt now at /used-cars, or ring the office on 01978 356983. Next, if you are weighing up where to buy, read /read/guides/dealer-or-private-seller-for-a-used-car.