Written by Marie Oxland | Personal Injury | 06 November 2026
This guide explains the law of England and Wales. Scotland and Northern Ireland have their own, slightly different rules.
The short answer
If you have been injured and want to claim compensation through the courts, you normally have three years to start your claim. Miss that deadline and you usually lose the right to claim at all, even if the accident was entirely someone else's fault. There are some important exceptions, explained below, but the three-year rule is the starting point for almost every personal injury case: a car crash, a slip in a supermarket, an accident at work, or an injury caused by poor medical treatment.
What a "limitation period" actually is
A limitation period is simply a legal deadline. It is the window of time in which you must formally begin a court claim. "Beginning" the claim means issuing court proceedings, not just complaining to the other side, writing letters, or starting to negotiate. If the three years run out before your claim is properly started at court, it is said to be "time-barred" or "statute-barred".
Think of it like the "best before" date on your right to sue. Up to the deadline, the courts will hear your case. After it, the door is normally shut.
Why the law has a deadline at all
The courts describe the time limit as striking a balance between two fair-minded concerns: giving an injured person a proper opportunity to bring their claim, while not forcing the other side to defend a case about events from the distant past.
That balance matters in everyday terms:
Evidence goes stale: witnesses move away or forget what they saw. CCTV is wiped, the wet floor was mopped up years ago. The sooner a claim is brought, the fairer the fight over what really happened.
People deserve to move on: it would be hard on a shopkeeper or a driver to be sued over something that happened fifteen years ago, long after they reasonably assumed the matter was closed.
It encourages prompt action: knowing there is a clock running pushes everyone to sort things out while the facts are fresh.
When does the three-year clock start ticking?
This is the part people most often get wrong. The clock usually starts on the date of the accident or injury but not always. The law recognises that sometimes you do not realise straight away that you have been harmed, or that someone else is to blame. So the three years actually runs from the later of two dates:
the date you were injured; or
your "date of knowledge", the date you first realised (or reasonably should have realised) three key things: that your injury was serious, that it was caused by someone else's act or failure, and who that person was.
Two everyday examples show the difference
A straightforward car accident: you are hurt in a crash on 1 March 2026. You know at once that you are injured and who caused it. The clock starts that day, and you have until 1 March 2029 to start a claim.
A harm that shows up later: suppose you worked for years with a material that slowly damaged your lungs, and you only find out from a doctor in 2026 that your illness was caused by that exposure. The clock does not start back when you first breathed in the dust, it starts in 2026 when you learned your illness was serious and what had caused it. This "date of knowledge" rule exists precisely so that people are not time-barred before they even know they have been harmed.
A few practical points the courts have settled about "knowledge":
You do not need to be certain, and you do not need a lawyer to have confirmed you have a valid case. You only need to know enough to make it reasonable to start looking into it, a firm suspicion backed by reasonable belief is usually enough.
"Knowledge" also covers what you ought to have found out. If a sensible person in your position would have asked a doctor or made obvious enquiries, the law may treat you as having known from the point those enquiries would have told you.
The test is an objective one: the court assumes that someone with an injury serious enough to see a solicitor about would be curious enough to seek appropriate advice. Not knowing that the law treats something as negligence does not stop the clock. What matters is knowing the facts, not the legal label.
What happens if you miss the deadline?
If you try to bring a claim after the three years are up, the claim does not automatically vanish but the other side can raise the time limit as a complete defence. If they do, and no exception applies, the court will normally throw the claim out without ever deciding whether you were actually in the right. In practice, a late claim is usually a lost claim.
Exceptions: when the deadline shifts or can be extended
The three-year rule is firm, but not absolute. The main situations where it changes:
Children: for someone injured as a child, the clock does not even start until their 18th birthday. They then have until their 21st birthday to bring a claim. (Before they turn 18, a parent or guardian can bring a claim on their behalf, they do not have to wait for the child to grow up.)
People who cannot manage their own affairs: if an injured person lacks the mental capacity to handle a claim. For example, because of a serious brain injury or a condition affecting their mind, the three-year clock is paused for as long as that incapacity lasts and only starts to run if and when they recover capacity.
Deliberate concealment or fraud: if the person responsible hides a key fact from you or the claim is based on their fraud, the clock does not start until you discover the truth or could reasonably have discovered it. For example, if an employer deliberately covered up a safety failure that injured you, the time limit would not run while the cover-up kept you in the dark.
If the injured person dies: where someone dies before their own three years are up, a fresh three-year period runs, generally from the date of death or from when the person handling their estate knew the relevant facts. A claim by dependants under the fatal-accidents rules is likewise subject to its own three-year limit from the death or the dependant's knowledge; but if the person who died was already out of time when they died, the dependants cannot revive the claim.
The court's safety valve
Even where the deadline has passed and none of the above applies, a court has a special discretion in personal injury cases to allow a late claim to go ahead if it considers it fair to do so. This is not a soft option or a routine second chance, it is a genuine discretion the court exercises only after weighing all the circumstances. The core question is whether, despite the delay, it is still fair and just to expect the other side to defend the claim on its merits. In deciding, the court looks at things like:
how long the delay was, and your reasons for it;
whether the delay has made the evidence less reliable (fading memories, lost documents);
how the other side behaved, and whether they already knew a claim was coming;
how promptly and sensibly you acted once you realised you might have a claim; and
what steps you took to get medical or legal advice.
A claimant who gave the other side early warning of the claim so that they could still investigate properly stands a far better chance than one whose delay has left the defendant unable to defend fairly.
What this means for you in practice:
Treat three years as the outer limit, not the target. Evidence is strongest, and your position is best, when you act early.
Don't assume the clock started at the accident if your injury surfaced later but don't gamble on the "date of knowledge" rule either. If there is any doubt about when your time runs, get advice quickly.
The exceptions are genuine but narrow. The court's power to allow a late claim exists, but relying on it is risky and never guaranteed.
Different deadlines apply to some situations: claims against airlines, cruise operators, or under certain other specialist rules can have shorter or different limits, and Scotland and Northern Ireland differ. If your situation is unusual, get advice quickly as it is probably the case that a shorter limitation period applies.
If in doubt, speak to a solicitor well before the three years are up. A missed deadline is one of the few mistakes in a claim that usually cannot be fixed.
This guide is general information about the law, not advice on your own case. For anything specific to your situation, especially working out exactly when your deadline falls, consult a solicitor as early as you can.
How Nash & Co Solicitors can help
At Nash & Co Solicitors, our Personal Injury team understands that trying to work out the time limit of your claim can leave you with lots of questions. We offer a free, no obligation consultation with an experienced Personal Injury lawyer, giving you the opportunity to talk through what happened and understand what steps may be available to you. We will explain the process clearly, answer your questions and provide straightforward advice without any pressure to proceed.
If you decide to move forward, we will support you on a no win no fee basis. This allows you to explore your options without needing to pay legal fees upfront, with the costs and process explained clearly from the beginning.
Based in Plymouth, our team supports clients across Devon, Cornwall and across England and Wales. You can get in touch with the team to discuss your circumstances confidentially and without any pressure to proceed by calling 01752 827031 or emailing enquiries@nash.co.uk.
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