Professional Negligence Claims UK: Duty of Care, Time Limits & How to Claim

At a glance

• Legal basis: a duty of care in contract and/or tort. A professional's conduct is judged against the standard of a reasonably competent member of their profession, not perfection.
• Causation and scope of duty: it is not enough to show a mistake was made — the loss claimed must fall within the purpose of the duty the professional took on, following the Supreme Court's guidance in Manchester Building Society v Grant Thornton [2021] UKSC 20.
• Time limit in contract: 6 years from the breach — Limitation Act 1980, section 5.
• Time limit in tort: 6 years from when the damage occurred — Limitation Act 1980, section 2.
• Latent damage extension: a further 3 years from the date you had (or reasonably should have had) knowledge of the problem — section 14A.
• Long-stop: an absolute 15-year cut-off from the negligent act or omission — section 14B — with generally no court discretion to extend it, unlike in personal injury claims.
• Before court: the Professional Negligence Pre-Action Protocol expects a Letter of Claim, followed normally by three months for the professional (usually via their insurer) to investigate and respond.
• Alternatives: many professions run a free ombudsman or regulator complaints scheme — for solicitors, the Legal Ombudsman — which can sometimes resolve a problem without a formal claim.

What counts as professional negligence?

Professional negligence is a civil claim brought against someone acting in a professional capacity who has fallen short of the standard expected of a reasonably competent member of their profession, causing you a loss. It rests on a duty of care that can arise under a contract (the retainer or engagement letter), in the tort of negligence, or both at once, depending on how the relationship was set up.

Common examples include a solicitor missing a limitation date, a conveyancer failing to flag a restrictive covenant or defect in title, an accountant giving incorrect tax guidance, a surveyor overlooking a structural defect, or a financial adviser recommending an unsuitable investment. In every case, the claimant generally has to establish four things: duty, breach, causation and loss. Each element can be contested, and claims often turn heavily on expert evidence about what a competent professional in that field should have done.

The legal test: duty, breach, causation and loss

The standard of care: the Bolam test

The standard used to judge whether a professional has breached their duty comes from the case law principle usually referred to as the Bolam test, after Bolam v Friern Hospital Management Committee [1957] 1 WLR 582. Although that case concerned a doctor, the same approach is applied across the professions: a professional is not negligent if they acted in accordance with a practice accepted as proper by a responsible body of opinion in their field, even if other practitioners would have done things differently.

In practice, this means a claimant cannot succeed simply by showing that another professional would have handled the matter differently, or that the outcome was disappointing. The question is whether the professional's conduct fell below what a reasonably competent, responsible body of opinion in that profession would regard as acceptable at the time.

Causation and loss: the scope of duty (SAAMCO) principle

Showing a breach is not enough on its own — you also have to show that the breach caused a loss that the law will hold the professional responsible for. This is governed by what is often called the SAAMCO principle, taking its name from an earlier House of Lords case, and significantly clarified by the Supreme Court in Manchester Building Society v Grant Thornton UK LLP [2021] UKSC 20.

The Supreme Court held that the correct approach is to ask what the purpose of the professional's duty actually was, judged objectively by reference to why the advice or service was being provided. If a loss falls outside that purpose — even if the professional was undeniably negligent and the loss would not have happened "but for" their error — it may not be recoverable. In Manchester Building Society, the Society was able to recover break costs caused by relying on negligent accounting advice, because those costs fell within the purpose of the advice given.

A related distinction, addressed by the Supreme Court in BPE Solicitors v Hughes-Holland [2017] UKSC 21, is between a professional who advises on a transaction as a whole and one who only provides a limited piece of information on which the client relies alongside other considerations. Where a professional's role was limited to supplying specific information, their liability is generally limited to the consequences of that information being wrong — not every loss that flows from the client's wider decision to go ahead with the transaction. This scope-of-duty analysis is one of the most technical, and most often contested, parts of a professional negligence claim, and it is where specialist advice tends to matter most.

Time limits: the Limitation Act 1980

Limitation is one of the most important, and most commonly missed, aspects of a professional negligence claim. Once the relevant deadline passes, the claim is generally lost entirely, regardless of its merits.

• Contract claims: 6 years from the date of the breach of contract, under section 5 of the Limitation Act 1980.
• Tort claims: 6 years from the date the damage occurred, under section 2 of the Limitation Act 1980. This can be earlier than you might expect — damage can occur, and time can start running, before you are aware of it.
• Latent damage (date of knowledge): where loss only becomes apparent later, section 14A can give you 3 years from the date you had the knowledge needed to bring a claim — including knowledge you ought reasonably to have acquired.
• The long-stop: section 14B sets an overriding 15-year cut-off running from the date of the negligent act or omission, regardless of when the damage or your knowledge of it arose. Unlike the position for personal injury claims, there is generally no equivalent court discretion under the Limitation Act to disapply this 15-year long-stop for professional negligence claims involving financial loss.

Because these rules interact and the applicable date can be genuinely difficult to pin down (particularly the "date of knowledge" under section 14A), it is sensible to establish your limitation position, in writing, at the earliest possible stage — ideally before you do anything else.

The Professional Negligence Pre-Action Protocol

Before issuing court proceedings against a professional such as a solicitor, accountant, surveyor or architect, the courts expect the parties to follow the Professional Negligence Pre-Action Protocol, issued under the Civil Procedure Rules. In outline, the protocol expects the claimant to send a Preliminary Notice, followed by a detailed Letter of Claim setting out what went wrong, why it is said to be negligent, and what loss is said to have flowed from it. The professional (typically through their insurer) then has three months from acknowledging the Letter of Claim to investigate and respond, usually with a Letter of Response and, where appropriate, a Letter of Settlement.

The protocol is designed to encourage early, informed settlement and to narrow the issues in dispute before litigation starts. Skipping it, or not engaging with it properly, can result in cost penalties later even if you go on to win the case.

Alternatives to a formal claim: complaints and ombudsman schemes

A formal negligence claim is not always the first or only option. Many regulated professions run their own complaints process, and several have access to a free ombudsman scheme that can investigate and, in some cases, award compensation without the cost and formality of litigation. For solicitors in England and Wales, that route is the Legal Ombudsman. Other professions have their own regulators and complaints bodies. Our guide to complaining to an ombudsman explains how these schemes generally work, including typical time limits — which are often different from, and shorter than, the Limitation Act deadlines described above, so check the relevant scheme's own rules promptly.

An ombudsman or regulatory complaint and a civil claim are not always mutually exclusive, but the interaction between them (including how pursuing one can affect time limits for the other) is worth checking carefully before you commit to either route.

Evidence, experts and quantifying your loss

Professional negligence cases turn heavily on documentary evidence and expert opinion. From the outset, it helps to gather:

• The engagement letter, retainer, terms of business or contract with the professional.
• All correspondence, file notes, reports, drafts and invoices connected to the work.
• Anything showing the loss you say you have suffered, and when you first became aware of it.

Because the standard of care is measured against what a reasonably competent practitioner in the same field would have done, independent expert evidence from someone practising in that field is almost always needed to establish breach. Quantifying loss can also require specialist input — for example, a forensic accountant where the claim involves lost profits or a complex financial transaction.

Settlement, mediation and court

Most professional negligence claims that are properly pursued do not end up at trial. Many resolve during the pre-action protocol stage, once the professional's insurer has assessed the claim, or through mediation. GOV.UK's guide to civil mediation explains how mediation works as a voluntary, confidential process in which an independent mediator helps both sides try to reach an agreed settlement, without a judge deciding the outcome.

If a claim cannot be resolved and proceedings become necessary, you can find general information on starting a claim at GOV.UK's make a court claim for money guidance. In practice, professional negligence claims are usually too complex, or too high in value, for the small claims track — see our small claims court FAQs for where that track's limits generally stop applying. Most professional negligence claims proceed on the fast track or multi-track instead, where costs rules and case management are more involved.

What to do if you think a professional has been negligent

1. Gather the paperwork. Pull together the engagement letter, correspondence, invoices, reports, file notes and anything showing your loss. Build a clear chronology before doing anything else — the strength of a claim often turns on what the contemporaneous records actually say.
2. Check your time limits early. Work out the relevant date under sections 2, 5, 14A and 14B of the Limitation Act 1980. If you are close to a deadline, get advice immediately rather than waiting.
3. Consider whether a complaint or ombudsman route is available first. For solicitors and some other regulated professions, a free complaints scheme may resolve the problem, or narrow it, before you commit to formal proceedings.
4. Follow the Professional Negligence Pre-Action Protocol. Send a Preliminary Notice, then a Letter of Claim, and allow the professional's normal three-month window to investigate and respond. Skipping this step can affect costs later.
5. Get independent expert input. You will generally need an expert practising in the same field to comment on whether the work fell below the standard expected, and you may need further specialist input to quantify your loss.
6. Weigh up settlement against court. Many claims resolve through negotiation, mediation, or the professional's insurer making an offer. Litigation is expensive and the outcome is never guaranteed, so weigh the strength of the evidence, the likely recovery, and the cost of getting there.
7. Take advice early. Professional negligence claims are technical, particularly on causation and scope of duty. An early conversation with someone who can look at your specific facts and dates is usually worth more than pressing ahead alone.

This guide provides general information about professional negligence claims in England and Wales. It is not legal advice and is not a substitute for advice tailored to your specific circumstances. The law described was accurate as at July 2026 and is subject to change — always check legislation.gov.uk and GOV.UK for the most current position.

Last reviewed: July 2026 by a non-practising solicitor · Next review due: July 2027 or on legislative change.