What a Car Repair Quote Should Include (And What “Estimate” Really Means)

A quote is a fixed price. Once you accept it, that is what the job costs. An estimate is a considered best guess that can move as the work is done. Both are entirely legitimate, and most garage paperwork is honestly one or the other — the problem is being handed one while believing you have the other.

So the single most useful question you can ask is: “is that a quote or an estimate?” Everything below follows from the answer.

What should actually be on the document

Whichever of the two it is, it should tell you six things. If it tells you one number and nothing else, you cannot check it, compare it, or argue with it later.

• Parts, listed individually, with the grade stated. Not “parts — £180”. Which parts, and whether they are original-equipment, an OEM-equivalent or an aftermarket brand. That distinction is most of the price difference between two quotes for the same job
• Labour, as hours × rate, not a lump. You want to see the time being charged, because that is the figure that varies most between garages and the one you can sanity-check against the job
• Consumables and sundries — oil, coolant, brake fluid, seals, cable ties, disposal. Small individually, and they should still be on the paper rather than appearing at the end
• Any diagnostic charge, and — the part people forget to ask — whether it is credited against the repair if you go ahead
• VAT, and whether the figures already include it. A price given to a private customer should be VAT-inclusive, and the quote and the final bill should use the same basis. What you actually pay in VAT on car repairs covers the mechanics
• What is not included. The honest quotes say this out loud — “price assumes the discs are serviceable”, “excludes any seized fixings”

A garage that puts all six in writing is not doing you a favour. It is doing the ordinary thing.

Quote or estimate: what actually changes

The difference is not a matter of etiquette. It changes what you have agreed to.

Estimates are not a way of avoiding commitment. They exist because some work genuinely cannot be priced until something comes apart. Nobody can quote a fixed price to cure an intermittent electrical fault before finding it — and a garage that offers to is either guessing or planning to fit parts until the symptom stops.

What an estimate is not is a blank cheque. If a job estimated at £300 is going to land at £600, that is a conversation, not a footnote on the invoice.

What you were told counts, not just what was printed

This is the part most people do not know. Under the Consumer Rights Act 2015, information a trader gives you about a service — spoken as well as written — becomes a term of the contract where you relied on it in deciding to go ahead. A price agreed on the phone is not thin air simply because nobody typed it.

Two practical consequences:

• If you were quoted on the phone, send a text or an email confirming what was said before you drop the car off. One sentence. It costs nothing and it converts a memory into evidence
• If no price was ever discussed, the Act says you pay a reasonable price — not whatever appears on the invoice. Reasonable is judged against what the work would normally cost, which is exactly why comparable figures matter

Why two quotes for the same job are hundreds apart

Usually it is not one garage being greedy. It is four variables, and only the first is obvious.

Parts grade. Original-equipment parts come in the manufacturer’s box at the manufacturer’s price. OEM-equivalent parts are frequently made in the same factory by the same supplier without the badge, and cost meaningfully less. Aftermarket ranges run from excellent to genuinely poor. A quote that does not name the brand has not told you which of these you are buying.

Labour time. Most garages price from published book times for the job. Where two quotes differ on hours for identical work, one of them is using a different figure and it is fair to ask which.

What is bundled. A cambelt quote that includes the water pump and tensioner is not comparable to one that does not, even though both say “cambelt”. This is the single most common false comparison in car repair — see when to change a timing belt.

What has been assumed. A brake quote assuming the discs are reusable will change if they are not. That assumption should be on the paper.

Compare like for like or you are not comparing at all. The cheapest number for a job that has quietly been scoped smaller is not a saving.

The diagnostic charge, and why it is not a con

Charging to find a fault irritates people, and the reason is understandable: it feels like paying for nothing. But the alternative is worse, and it is called diagnosis by replacement — fitting parts until the symptom goes away and billing you for all of them.

A fault code names a circuit, not a broken component. What an OBD2 fault code actually tells you works through why. The diagnostic time is what turns a code into a cause, and it is the step that decides whether you are buying the right part.

The fair questions are: what does it cost, what will you actually do in that time, and is it credited against the repair? Ask the third one at booking. Practice varies legitimately between garages and it is not something you can infer.

When the bill can legitimately exceed the quote

Sometimes it can, and pretending otherwise is not useful.

• A second fault is found. Genuinely common once a car is on a ramp and not, in itself, a warning sign
• A fixing shears or seizes. A corroded exhaust bolt or a seized calliper slider turns a one-hour job into three — one of the commonest reasons a repair overruns — and no one could have seen it from outside
• The part that arrives is wrong for the build. Same model, different specification mid-production

What makes any of these acceptable is the same in every case: you were rung and asked before the extra money was spent. Being told at the counter afterwards is a different thing entirely, whatever the reason behind it.

If the final bill is higher than agreed

Ask for the breakdown first, in writing, and read it against the original. Very often it is a line you did authorise on the phone and had forgotten, or a consumable that was always going to be there.

If it genuinely is not, say so before you pay, and say it in writing. Be aware of one thing that surprises people: a garage can generally keep the car until the bill is settled — that is a lien, and it applies even while you dispute the amount. The usual way out is to pay under protest, in writing, and pursue it afterwards rather than leaving the car there. How to complain about a garage sets out the whole route.

Getting a useful quote over the phone

Give the registration, the mileage, and the symptom in your own words — including when it happens, not just what it is. “Squeals for the first two minutes on a cold morning and then stops” is a diagnosis in a sentence; “makes a noise” is not.

Then ask the four questions on how to find a trustworthy garage. If the answers cause friction, that is the information you were after.

We agree the price before we start and we put it in writing. Where a fault has to be found first, we will say so and quote the diagnosis rather than pretending to price a repair nobody has identified yet. Fault diagnosis in Birmingham, seven days a week — or ring us with the registration and we will tell you which of the two you are getting.