How to Write a Breach of Contract Letter in the UK

When the other party fails to deliver what was agreed — goods, services, payment, or performance — you have legal remedies. A formal breach of contract letter is the essential first step: it documents the breach, states your losses, and gives them a final chance to resolve before court.

What the Law Says

The legal principles governing contract disputes in England and Wales:

• Hadley v Baxendale [1854] — damages must be within the reasonable contemplation of the parties at the time of contracting; sets the limit on what you can recover
• Consumer Rights Act 2015 — implies terms into consumer contracts: goods must be of satisfactory quality, fit for purpose, and as described; services must be performed with reasonable care and skill, within a reasonable time, and at a reasonable price if not agreed
• Sale of Goods Act 1979 — applies to B2B contracts for sale of goods; similar implied terms on quality and fitness
• Limitation Act 1980 — you have 6 years from the date of breach to bring a claim in contract (3 years for personal injury; 12 years for contracts under seal)

What Constitutes a Breach

A breach of contract arises when a party:

1. Fails to deliver goods or services by the agreed date or at all
2. Delivers defective goods or services that do not meet the agreed specification, quality, or fitness for purpose
3. Fails to pay the agreed price or pays less than agreed
4. Anticipatory breach — clearly indicates (by words or conduct) that they will not perform before performance is due
5. Violates an express term of the contract (e.g. a confidentiality clause, exclusivity clause, or non-compete obligation)

Material Breach vs Minor Breach

A material (or repudiatory) breach goes to the root of the contract and entitles you to treat the contract as terminated and claim all your losses. A minor breach entitles you to damages but does not give you the right to terminate. If you accept a repudiatory breach (by continuing to perform or demanding performance), you may lose the right to terminate — act promptly.

When You Have a Valid Claim

Before writing your letter, confirm you have:

1. A valid contract (offer, acceptance, consideration, intention to create legal relations)
2. Evidence of the agreed terms (written contract, emails, text messages, invoices)
3. Evidence that the breach has occurred (delivery records, communications, expert assessment)
4. A quantifiable loss flowing from the breach
5. Complied with your own obligations under the contract (you cannot claim if you were in breach yourself)

What Your Letter Should Include

Key tip: A breach of contract letter also serves as a "Letter Before Action" (LBA) under the Pre-Action Protocol for Debt Claims. Courts expect parties to have attempted resolution before litigating. Sending a proper LBA can also make courts more sympathetic if you need to enforce a judgment later.

Calculating Your Damages

Quantify your claim clearly. Include: the price paid for goods or services not delivered or delivered defectively; the additional cost of obtaining equivalent performance elsewhere (cover cost); wasted costs incurred in reliance on the contract; and loss of profits if reasonably foreseeable. Do not include speculative or remote losses — courts will reduce claims that exceed what was reasonably foreseeable at the time of contracting.

Escalation Paths

Frequently Asked Questions

What constitutes a breach of contract under UK law?

A breach of contract occurs when a party fails to perform their obligations under a binding agreement without lawful excuse. This includes non-delivery, defective performance, non-payment, and anticipatory breach. Material breaches entitle you to terminate; minor breaches entitle you to damages only.

Do I need a written contract to claim breach of contract?

No. Contracts can be verbal or evidenced by conduct. However, written evidence (emails, invoices, texts) is essential to prove the terms agreed. Without written evidence, verbal contract claims are harder but not impossible to pursue.

What damages can I claim for a breach of contract?

Damages aim to put you in the position you would have occupied had the contract been performed. This includes direct losses, the cost of substitute performance, and reasonably foreseeable consequential losses. You must mitigate your losses — you cannot let them accumulate when reasonable steps could have limited them.

When should I escalate a breach of contract claim to court?

Escalate to the County Court via Money Claim Online when: you have sent a formal Letter Before Action with no satisfactory response; the amount in dispute is clear and quantifiable; and you have evidence of the contract and the breach. The 6-year limitation period means you have time — but do not delay unnecessarily as evidence fades.