MOT Retest Rules: When It’s Free and When It Isn’t

Whether an MOT retest is free comes down to two things: where the car goes after it fails, and how quickly it comes back.

The general shape of the rules:

• Leave the car at the test centre for repair and have it retested within 10 working days — normally a free partial retest.
• Take the car away and bring it back before the end of the next working day — normally a free partial retest, though this applies to a defined list of simpler items rather than everything.
• Bring it back later, but still within 10 working days — a partial retest, which some centres charge a reduced fee for.
• Bring it back after 10 working days — a full test at the full fee. The clock has run out.

The 10 working days is the number to hold on to. Working days means Monday to Friday, so a fortnight of calendar time is roughly the window.

Why “partial” matters

A partial retest re-examines only the items that failed. A full test starts again from scratch and charges accordingly — up to the statutory maximum of £54.85 for a Class 4 vehicle.

The distinction matters because it changes the arithmetic on where you have the repair done. If a garage down the road quotes £30 less for the work but the delay means paying for a full retest, you are worse off.

Centres differ, and you are allowed to ask

Within the framework above, individual test centres set their own practice on what they charge for a partial retest. Some never charge. Some charge a nominal fee. Both are legitimate.

So ask before you commit. Two questions, at the point of failure:

1. “If I leave it with you, is the retest free?”
2. “If I take it away and bring it back, what is the retest position and what is the deadline?”

Get the answer before you decide where the work happens. Any reasonable garage will answer plainly, and one that will not has told you something useful.

You are still free to take the repair elsewhere

It is also worth knowing exactly what was inspected before you accept a failure list. Nothing here obliges you to have the work done at the test centre. A VT30 refusal notice is a statement of what the car does not comply with, not a repair order. You can take it anywhere, get quotes, or do the work yourself if you are able.

The retest position is simply one of the costs to weigh. For a large repair, a better quote elsewhere easily outweighs a retest fee. For a small one — a bulb, a wiper blade, a tyre — the sums usually favour having it done on the spot.

There is also a middle option people forget: you can have the repair done elsewhere and return to the original centre for the retest, provided you are inside the window.

Can you drive the car in between?

This is where people get caught. Failing the test does not automatically ground the car, but it depends on two things:

• Any dangerous defect: the car must not be driven at all, retest booked or not. See MOT dangerous defects.
• Your previous certificate: if it has not yet expired and nothing is marked dangerous, you can generally still drive. If it has expired, you may only drive to a pre-arranged repair or a pre-booked retest.

Our guide on driving without an MOT covers the exemptions in detail.

How to make the window work for you

The single most effective thing you can do is test early. You can have a car tested up to a month minus a day before the current certificate expires and keep the same renewal date. Do that, and if it fails you have both the 10 working days for the retest and the remaining certificate life to sort the repair out — without ever being unable to drive.

Test on the last day and a failure means an immediately illegal car, a deadline, and whatever price you are quoted while standing at a counter with no alternatives. The certificate costs the same either way.

How much does it cost?

When should you call a garage?

Ring before the 10 working days run out — that is the deadline that actually costs money. If the repair is going to take longer, say so, because it is better to plan a full retest than to discover one.

Ring at the point of failure to ask the two questions above, and ring another garage for a second quote if the figure surprises you. Both are entirely normal.

We are a DVSA-approved test centre and a repair garage, so we can test, repair and retest without the car going anywhere. We are also open seven days a week, which makes a 10-working-day window considerably easier to hit. MOT testing in Birmingham.