How long do you have to make a medical negligence claim?
Short answerIn the UK you generally have three years to start court proceedings in a clinical negligence claim — measured either from the date of the negligent act or from your date of knowledge. Different rules apply for children (the clock starts on their 18th birthday) and for people who lack mental capacity (no limitation runs while incapacity continues).
The Limitation Act 1980
For claims in England, Wales and Northern Ireland the relevant statute is the Limitation Act 1980. Section 11 sets a 3-year limitation period for any personal injury claim — including clinical negligence. Scotland's broadly equivalent framework sits in the Prescription and Limitation (Scotland) Act 1973.
Date of knowledge
Many medical injuries are not obvious straight away — a missed cancer diagnosis, for example, may only become apparent months or years later. The law recognises this. Your 3-year period runs from the later of:
- the date the negligent act or omission occurred, or
- your date of knowledge — the date you first knew (or ought reasonably to have known) that you had suffered a significant injury and that it was attributable to the act or omission of the healthcare provider.
People who lack mental capacity
Where the injured person lacks mental capacity within the meaning of the Mental Capacity Act 2005, no limitation period runs at all for as long as that incapacity continues. This is a critical protection in cases involving severe brain injury, advanced dementia, or profound learning disability.
Fatal claims
Where negligence has resulted in death, dependants can usually bring a claim under the Fatal Accidents Act 1976 within 3 years of the date of death — or, if later, the date the dependants knew the death was caused by the negligence.
Section 33 discretion
Even where a claim is technically out of time, the court has a discretion under section 33 of the Limitation Act 1980 to allow it to proceed if it would be equitable to do so. The court weighs factors including the reasons for delay, the strength of the evidence, and any prejudice to the defendant. This discretion is rarely exercised — never rely on it as a safety net.
Frequently asked questions
What is the time limit for a medical negligence claim in the UK?
Under the Limitation Act 1980 you generally have 3 years from the date of the negligent act, or from your date of knowledge, to issue court proceedings in England, Wales and Northern Ireland. Scotland uses a similar 3-year period under the Prescription and Limitation (Scotland) Act 1973.
What is the 'date of knowledge'?
Your date of knowledge is the date you first knew (or could reasonably have known) that you suffered a significant injury and that it was caused by the act or omission of the healthcare provider. The 3-year clock runs from this date, not necessarily from the treatment date.
Are there exceptions for children?
Yes. For under-18s the limitation clock does not start until their 18th birthday — meaning a claim can usually be brought any time before they turn 21. A litigation friend (typically a parent) can also bring a claim earlier on the child's behalf.
What if the patient lacks mental capacity?
If the injured person lacks mental capacity within the meaning of the Mental Capacity Act 2005, there is no limitation period at all while that incapacity continues. The 3-year clock only starts running if and when capacity is regained.
Can the court extend the time limit?
Yes — under section 33 of the Limitation Act 1980 the court has discretion to disapply the 3-year limit where it would be equitable to do so. This is fact-sensitive and never guaranteed; the safer course is always to act well within the standard 3 years.