What if the garage says the new damage was unrelated or pre-existing?

The garage may dispute that the new fault is connected to their work. In that case, an independent inspection report — from a mechanic who wasn't involved in the original repair — can help establish whether the failure is directly linked to substandard work. Keeping the original invoice, a timeline of when the new fault appeared, and photos or diagnostic reports strengthens your position.

What can I claim for if a repair caused further damage?

You can generally claim the reasonable cost of repairing the new damage, and in some cases related losses such as recovery or reasonable alternative transport costs if the fault left the car undriveable. Keep all receipts and quotes, and raise the claim with the garage in writing before considering a small claims court case if they refuse to engage.

Cars & Vehicles · UK

Who pays if a repair fails and damages another part of the car?

Q: Who pays if a repair fails and damages another part of the car?

Normally, the garage is liable. Under UK consumer law, a trader providing a service must carry out the work with reasonable care and skill. If a botched repair causes new damage elsewhere in the vehicle — for example, a poorly fitted part that leads to a separate mechanical failure — that's a breach of that duty, and the garage is generally responsible for the cost of putting it right, not just re-doing the original job.

Reasonable care and skill isn't optional — if a botched repair causes new damage, that's usually the garage's bill to pay.

Kibbo Consumer Desk · Updated September 2026 · 6 min read

Normally, the garage is liable. Under UK consumer law, anyone providing a service — including a car repair — must carry out that work with reasonable care and skill. If a poorly executed repair leads directly to new damage elsewhere in the vehicle, that's a breach of that duty. The garage is generally responsible for putting the resulting damage right, not just re-doing the original job you paid for.

Establishing the link between the repair and the new fault

Scenario	Likely outcome
New fault appears shortly after the repair, in a directly related system	Strong case the garage is liable — e.g. a poorly fitted part causing a related failure
Garage disputes the connection	An independent inspection from an uninvolved mechanic can establish the causal link
New fault is genuinely unrelated (separate, pre-existing issue)	Garage isn't liable for that unrelated problem
Garage refuses to engage at all	Formal written complaint, then small claims court if unresolved

What evidence strengthens your case

The original invoice describing exactly what work was carried out.
A clear timeline: when the repair was done, and when the new fault first appeared.
Photos or diagnostic printouts showing the new damage.
An independent mechanic's report, if the garage disputes the connection — this is often the deciding piece of evidence.

What you can claim

You can generally claim the reasonable cost of repairing the new damage caused by the substandard work. In some cases, you may also be able to claim related losses — such as recovery costs or the cost of reasonable alternative transport — if the fault left the car undriveable. Keep every receipt and quote, and put your claim to the garage in writing first, giving them a reasonable opportunity to respond before escalating.

Steps to take

Get an independent assessment if the garage disputes that the new fault is connected to their work.
Write to the garage explaining the issue, referencing the original invoice and the independent report if you have one.
Request the cost of the repair, plus any directly related losses.
If the garage refuses to resolve it, you can pursue a small claims court case — most disputes of this kind fall well within the small claims limit.

Official sources

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