Learn how to write a letter before action for a UK small claim. This step-by-step guide covers what to include, tone, deadlines, and next steps.

How to write a letter before action

Before you rush to the courts, there is one important step you should take first: sending a letter before action (LBA). This formal written notice tells the person or business you have a dispute with that you intend to begin legal proceedings if the matter is not resolved. It is a required step under the UK’s Pre-Action Protocol for Debt Claims and is strongly encouraged by courts across all types of civil disputes. Getting it right can save you time, money, and stress — and in many cases, a well-written LBA is enough to prompt a settlement without ever setting foot in a courtroom.

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What is a letter before action and why does it matter?

A letter before action — sometimes called a letter before claim — is a formal written demand sent to a defendant before you issue proceedings through the County Court. It outlines your dispute, the amount you are claiming, and gives the other party a reasonable opportunity to respond or pay before legal action begins.

Courts take the pre-action stage seriously. Under the Civil Procedure Rules (CPR), judges expect both sides to have attempted to resolve the dispute before proceedings are issued. If you skip this step and go straight to court, the judge may penalise you on costs — even if you win your case. Sending a proper LBA demonstrates that you have acted reasonably and in good faith.

Beyond the legal requirement, a well-crafted letter before action often works. Many defendants, upon receiving formal written notice that you are serious about pursuing the matter, will pay up or enter into negotiations rather than face the hassle and expense of a court claim.

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What to include in your letter before action

Your letter does not need to be written in legal jargon, but it must be clear, complete, and professional. Here is what every effective letter before action should contain:

Your details

Include your full name (or business name), address, and contact information. The defendant needs to know exactly who is making the claim.

The defendant’s details

Ensure you have the correct full name and address of the person or business you are claiming against. If you are claiming against a limited company, use its registered name and registered office address, which you can find on Companies House.

A clear description of the dispute

Explain what happened in plain, factual terms. Avoid emotional language or accusations — stick to the facts. Include relevant dates, reference numbers, invoice numbers, or contract details where applicable.

The amount you are claiming

State the exact sum you are seeking. If you are claiming statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998 or the County Courts Act 1984, calculate this and include it in your total. Our interest calculator can help you work out exactly how much interest you are entitled to add to your claim.

Supporting evidence

Reference any documents that support your claim — contracts, invoices, receipts, photographs, or written communications. You do not need to attach everything at this stage, but let the defendant know you have the evidence to back up your claim.

A deadline to respond

Give the defendant a clear and reasonable deadline to respond or pay. For most small claims, 14 days is standard, though the Pre-Action Protocol for Debt Claims requires 30 days for consumer debt matters. Be explicit: state that if payment or a satisfactory response is not received by the deadline, you will issue a claim through the County Court without further notice.

Your preferred resolution

State clearly what you want — whether that is full payment, a repair, a replacement, or something else. The more specific you are, the less room there is for confusion or delay.

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Getting the tone right

One of the most common mistakes people make when writing a letter before action is letting their frustration show. It is entirely understandable — disputes are stressful, especially when money is involved — but an angry or aggressive letter can undermine your position.

Keep these principles in mind:

• Be firm but professional. You are not asking for a favour; you are asserting a legal right. Your language should reflect that without being hostile.
• Avoid threats you cannot back up. Only state what you genuinely intend to do. Threatening criminal action when the matter is civil, for example, could actually weaken your case.
• Keep it concise. A letter before action is not the place to tell the entire story in exhaustive detail. State the key facts, the amount owed, the deadline, and the consequences of non-payment.
• Proofread carefully. Spelling mistakes and grammatical errors make your letter look less credible. Read it through carefully before sending.

A neutral, matter-of-fact tone signals to the defendant — and potentially to a judge — that you are a reasonable person who has made every effort to resolve the matter before resorting to court.

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How to send your letter before action

How you send your letter matters almost as much as what it says. You want to be able to prove that the defendant received it.

Post: Send your letter by first-class post and keep a copy, along with your proof of postage. If you want extra certainty, send it by recorded or special delivery so you have a tracking reference.
Email: If you have previously corresponded with the defendant by email, sending your LBA to the same address is generally acceptable. Keep a copy of the sent email and any read receipts.
Both: For higher-value claims or where you have any doubt about the defendant’s address, send by both post and email and document both.

Do not send your letter by social media message or text — these methods are unlikely to be taken seriously and may not constitute valid service.

Once sent, keep a copy of everything: the letter itself, proof of postage or sending, and any response you receive.

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What happens after you send the letter

After you send your letter before action, one of several things may happen:

They pay in full. The best outcome. Make sure you receive the funds before considering the matter closed.
They respond and propose a settlement. Consider whether their offer is reasonable. You are not obliged to accept less than you are owed, but a negotiated settlement avoids the time and cost of court proceedings.
They dispute your claim. They may respond with their own version of events. Read their response carefully — you will need to decide whether to proceed with a court claim or seek further evidence.
They ignore your letter. If the deadline passes with no response, you are in a strong position to issue a claim. The court will note that you gave the defendant every opportunity to resolve the matter.

If you need to proceed to court, you can issue a claim online using Money Claim Online (MCOL) for straightforward money claims up to £100,000, or through the County Court for other types of dispute. Small claims under £10,000 are typically handled through the small claims track, which is designed to be accessible without a solicitor.

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Make it easier with ClaimsPilot’s free tools

Writing a letter before action from scratch can feel daunting, particularly if you have never done it before. Getting the wording, tone, and content exactly right is important — and that is where ClaimsPilot can help.

Our free letter before action tool guides you through every element of your letter step by step, generating a professionally worded LBA tailored to your specific dispute. You can also use our interest calculator to ensure you are claiming every penny you are entitled to.

Whether your dispute involves an unpaid invoice, a faulty product, a contractor who did not complete work, or a landlord who withheld a deposit, ClaimsPilot gives you the tools to take action with confidence — no legal background required.

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Ready to take the first step? Create your free ClaimsPilot account and generate your letter before action today. It takes just a few minutes, and it could be all it takes to get the resolution you deserve.