The Pre-Action Protocol for Professional Negligence
What the protocol requires, how to write a Letter of Claim, the timescales involved, and what happens if the professional disputes liability.
Written by PDA Law Solicitors — acting for clients across England and Wales on a no win no fee basis.
No Win, No Fee — Professional Negligence Claims
We handle the entire pre-action protocol process on a conditional fee agreement. You pay nothing if your claim is unsuccessful.
The Basics
What Is the Pre-Action Protocol?
The Pre-Action Protocol for Professional Negligence is a set of rules that govern what must happen before a professional negligence claim can be issued in court. It is part of the Civil Procedure Rules and applies to all professional negligence claims in England and Wales (with some exceptions for construction professionals, who have their own protocol).
The protocol has two main purposes: to encourage the parties to exchange information and documents at an early stage, so that both sides understand the strengths and weaknesses of the claim; and to encourage early settlement, so that expensive and time-consuming court proceedings can be avoided.
Compliance with the protocol is mandatory. If you issue court proceedings without following the protocol (except in urgent cases), the court may impose cost penalties — even if you win your case.
Why the Protocol Works in Your Favour
Forces the professional to investigate and respond formally
Creates a paper trail that can be used in court if needed
Gives the professional's insurer an opportunity to settle early
Establishes the issues in dispute before expensive litigation begins
Failure to comply by the professional can result in cost penalties against them
Many claims settle at this stage — saving time, cost, and stress
Step by Step
The Protocol Process
Here is what happens at each stage of the pre-action protocol, and the timescales involved.
Preliminary Notice
OptionalAs soon as possible
Before sending the full Letter of Claim, you may send a brief Preliminary Notice to the professional alerting them that you intend to bring a claim. This is not mandatory, but it gives the professional early warning and allows them to notify their professional indemnity insurer promptly. It can also help to preserve evidence and prevent documents being destroyed.
Letter of Claim
The formal start of the protocol
The Letter of Claim is the formal document that starts the pre-action protocol process. It must set out: the identity of the claimant and the professional; a clear chronological summary of the facts; the allegations of negligence — what the professional did or failed to do; the causal link between the negligence and the loss; and the financial loss claimed, with supporting documents. The letter should be as detailed as possible — a well-drafted Letter of Claim significantly increases the prospects of early settlement.
Acknowledgement
21 days from receipt
The professional (or their insurer) must acknowledge the Letter of Claim within 21 days. The acknowledgement should confirm who will be handling the claim and whether the professional intends to investigate. If no acknowledgement is received within 21 days, you may be entitled to issue court proceedings without further notice.
Investigation Period
3 months from acknowledgement
After acknowledging the Letter of Claim, the professional has 3 months to investigate and respond. During this period, the professional will typically notify their professional indemnity insurer, review their file, take advice from their own solicitors, and consider whether to admit or deny liability. In complex cases, the parties may agree to extend this period.
Letter of Response
Within 3 months of acknowledgement
The professional must send a Letter of Response within 3 months. The Letter of Response must: admit or deny the allegations of negligence; if denying, set out the reasons for denial; identify any documents the professional relies on; and indicate whether the professional is willing to negotiate. If the professional admits liability, the parties should then negotiate the quantum (amount) of the claim.
Negotiation or Mediation
OptionalAfter the Letter of Response
If the professional admits liability or makes a settlement offer, the parties will negotiate the amount of compensation. If liability is disputed, the parties may agree to mediation — a voluntary, confidential process with a neutral mediator. Mediation has a high success rate in professional negligence claims and can resolve disputes that have been in deadlock for months. If negotiation and mediation fail, the claimant may issue court proceedings.
The Letter of Claim
What Must a Letter of Claim Contain?
The Letter of Claim is the most important document in the pre-action protocol. A well-drafted letter sets out your case clearly, demonstrates that you have a credible claim, and maximises the prospects of early settlement. It must contain:
Identity of the claimant and the professional
The professional relationship — when instructed, on what terms
A clear chronological summary of the facts
The specific allegations of negligence — what was done or not done
The standard of care that should have been applied
How the negligence caused the loss (causation)
The financial loss claimed, with supporting documents
Any relevant limitation issues
A request for documents held by the professional
A request to preserve all relevant documents
Why a Solicitor Should Draft Your Letter of Claim
A poorly drafted Letter of Claim can undermine your case, give the professional grounds to dispute liability, and make it harder to recover your full loss. We draft Letters of Claim as part of our no win no fee service — ensuring your claim is presented in the strongest possible terms from the outset.
Timescales
Protocol Timescales at a Glance
Letter of Claim sent
The formal start of the protocol
Acknowledgement required
Professional must acknowledge receipt
Letter of Response due
3 months from acknowledgement
Negotiation / Mediation
If liability admitted or partially admitted
Court proceedings (if required)
Only if protocol fails to resolve the claim
Common Questions
Frequently Asked Questions
Is the pre-action protocol mandatory?
Yes. The Pre-Action Protocol for Professional Negligence is a mandatory procedure that must be followed before issuing court proceedings (with limited exceptions, such as where the limitation period is about to expire). Failure to follow the protocol can result in cost penalties — the court may order the non-compliant party to pay the other side's costs, even if they win the case.
What happens if the professional does not respond to the Letter of Claim?
If the professional fails to acknowledge the Letter of Claim within 21 days, or fails to send a Letter of Response within 3 months, you may be entitled to issue court proceedings without further notice. The court will take the professional's failure to comply with the protocol into account when making costs orders.
Can the 3-month investigation period be extended?
Yes. The parties can agree to extend the 3-month investigation period if the claim is complex or if additional time is needed to obtain expert evidence. Extensions are common in complex professional negligence claims. However, you should be cautious about agreeing to extensions if the limitation period is approaching.
What if the professional admits liability in the Letter of Response?
If the professional admits liability, the parties will then negotiate the quantum (amount) of the claim. This is often the most contentious stage — the professional's insurer will want to minimise the payment, and you will want to recover your full loss. We will advise you on the appropriate level of compensation and negotiate on your behalf.
What if the professional denies liability?
If the professional denies liability, you have several options: you can accept the denial and take no further action; you can seek expert evidence to challenge the denial and continue to negotiate; or you can issue court proceedings. We will advise you on the strength of the denial and the best course of action.
Do I need a solicitor to send a Letter of Claim?
You can send a Letter of Claim yourself, but it is strongly advisable to instruct a solicitor. A well-drafted Letter of Claim significantly increases the prospects of early settlement. A poorly drafted letter can undermine your claim, give the professional's insurer grounds to dispute liability, and make it harder to recover your full loss. We will draft the Letter of Claim for you as part of our no win no fee service.
What is the difference between the pre-action protocol and court proceedings?
The pre-action protocol is a mandatory pre-litigation procedure designed to encourage early settlement and avoid unnecessary court proceedings. Court proceedings are issued in the County Court or High Court and involve formal pleadings, disclosure of documents, exchange of witness statements and expert reports, and ultimately a trial. The pre-action protocol must be completed before court proceedings can be issued (except in urgent cases).
Can I issue court proceedings before completing the protocol?
In most cases, no. However, there are exceptions: if the limitation period is about to expire, you can issue protective proceedings immediately and then comply with the protocol afterwards. You should always seek legal advice before issuing proceedings without completing the protocol.
Related Guides
More Professional Negligence Guides
What Is Professional Negligence?
The definition, the four elements you need to prove, and which professionals can be sued.
Read guideHow Long Do Claims Take?
Realistic timescales from Letter of Claim to settlement or trial — and what causes delays.
Read guideOur Professional Negligence Service
How we handle professional negligence claims — no win no fee, ATE insurance, and specialist expertise.
Read guideReady to Send Your Letter of Claim?
We will draft your Letter of Claim, manage the entire pre-action protocol process, and negotiate with the professional's insurer on your behalf — all on a no win no fee basis.