Being sued for professional negligence: what to do, and how PI insurance helps
Reviewed by Apex Insurance Brokers · Last reviewed 2026-08-05
A letter arrives. A former client says your advice, survey, design or accounts caused them a loss, and they want compensation. It is a horrible moment, and the instinct to explain yourself, say sorry, or quietly put it right is strong. Resist all three. What you do in the first few days shapes both the outcome and whether your insurance responds properly.
This guide walks through the practical steps, calmly and in order, and explains exactly where professional indemnity insurance fits in.
First, understand what a negligence claim actually is
Professional negligence, in England and Wales, generally means you owed a client a duty of care, you fell below the standard reasonably expected of a competent professional in your field, and that failing caused a foreseeable financial loss. A claimant has to prove all of it. An unhappy client is not the same as a valid claim, and many letters that land on desks never become anything more.
Claims are also time-limited. Under the Limitation Act 1980 the usual period is six years from the date the loss occurred (or, in some cases, three years from when the claimant knew they had a claim, subject to a long-stop). None of this means you should sit on a letter, but it does mean a solicitor may spot defences you would never see yourself.
The steps to take, in order
- Notify your PI insurer immediately. This is the single most important step. Most PI policies are written on a "claims made" basis, meaning they respond to claims (and often to circumstances that might lead to a claim) notified during the policy period. Late notification can entitle an insurer to reduce or decline cover. Tell them the moment you receive anything that looks like a claim — or even a hint of one.
- Say nothing that admits fault. Do not apologise for the work, agree you got it wrong, offer to redo it free, or discuss money. A well-meant "I'm so sorry, let me sort this out" can be read as an admission and can prejudice your insurer's position. Acknowledge receipt politely and say the matter is being reviewed — nothing more.
- Preserve everything. Lock down the full client file: engagement terms, correspondence, emails, notes, drafts, calculations, site photos, version histories. Do not tidy, edit, back-date or delete anything. Altering a file after a claim is far more damaging than any gap in it.
- Let the appointed solicitors lead. Your insurer will usually instruct specialist professional negligence solicitors (a panel firm). From that point, they run the correspondence and strategy. Your job is to give them full, honest instructions and hand over the file.
- Keep it confidential. Do not discuss the claim with the claimant, on social media, or with colleagues beyond those who need to know. Legal privilege protects communications with your solicitor — loose conversations elsewhere are not protected.
The Professional Negligence Pre-Action Protocol
Most claims in England and Wales follow the court's Professional Negligence Pre-Action Protocol before anything reaches a courtroom. Typically it runs like this: the claimant sends a short Preliminary Notice, then a detailed Letter of Claim. You (through your solicitors) have a set period to acknowledge and then to respond with a Letter of Response, admitting, denying or partly admitting the claim. The protocol encourages the parties to share information and consider settlement or mediation before issuing proceedings.
The practical takeaway: there is a structured process with deadlines, and it is designed to resolve most disputes without a trial. Your insurer and solicitors know this timetable intimately. Missing a protocol deadline because you delayed notifying is exactly the kind of avoidable harm that early action prevents.
Where PI insurance actually helps
A good PI policy does far more than write a cheque at the end. It steps in early and carries the load:
| What you face | How PI responds |
|---|---|
| Legal defence costs | Solicitors, barristers and experts instructed and paid by the insurer, usually on top of or within your limit depending on wording |
| Damages or a settlement | Compensation you are ordered or agree to pay, up to your limit of indemnity, less your excess |
| Claimant's costs | If you lose and are ordered to pay the other side's costs, these typically fall within cover |
| Not knowing what to do | Access to specialist claims handlers and panel solicitors who have seen your situation many times |
| A weak or opportunistic claim | The insurer funds a robust defence rather than you paying to fight it alone |
Limits of indemnity are commonly offered as generic options such as £1m, £2m or £5m, and the excess (the first part of any claim you pay) varies by policy. If your professional body sets a minimum limit — as several UK regulators do — make sure your cover meets it.
Not sure your current limit or wording would stand up to a real claim? Get it checked before you need it.
Get a PI quote →The mistakes that quietly wreck a defence
- Waiting to notify. "I'll see if it blows over" is the costliest sentence in this whole process. A circumstance you thought trivial can invalidate cover if it surfaces after renewal without notification.
- Apologising or offering to fix it. Kindness is human; here it can be read as an admission. Route everything through your insurer.
- Handling it yourself to save the excess or a premium hike. Settling privately can breach your policy's conditions and leave you unprotected if the client comes back for more.
- Letting cover lapse. Because PI is claims-made, if you have retired or closed the business you may need run-off cover so past work stays protected. Ceasing to trade does not end your exposure.
- Editing the file. Reconstructing notes after the fact is discoverable and devastating to credibility.
A short, illustrative example
Consider a small design consultancy that received a Letter of Claim alleging its drawings caused a costly build error. The instinct of one director was to email the client that evening promising a free redesign. Instead, they notified their PI insurer the next morning, sent only a brief acknowledgement to the claimant, and preserved the full project file. The insurer's panel solicitors reviewed the engagement terms, identified that the alleged error fell partly outside the agreed scope, and settled for a fraction of the sum demanded — with defence costs met by the policy. Had that "free redesign" email gone out, it would have been Exhibit A.
The lesson is not that every claim is winnable. It is that early notification and disciplined silence give your insurer the room to get the best available result. If you want to review your PI cover before a claim ever lands, that is the ideal time to act.
Common questions
Will notifying a claim increase my premium?
A notification is not the same as an upheld claim, and insurers expect them. Failing to notify is far more damaging: it can void cover entirely and leave you personally liable. Always notify. Worrying about the premium later is a much better problem to have.
What if the claim is completely unfair or the client is just angry?
Still notify, and still say nothing that admits fault. Many claims are weak, exaggerated or wrong — but the way to defeat them is through your insurer's solicitors, funded by your policy, not by arguing it out with the claimant yourself.
I've retired — can I still be sued for old work?
Yes. Liability can attach to work done years earlier, within the limitation periods. Because PI is claims-made, you generally need run-off cover in place so a claim arising after you stop trading is still met. Check this before you close down or let a policy lapse.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This guide is general information, not advice on a specific policy or a substitute for your policy wording.