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Write a powerful
complaint letter in seconds

Our AI writes professional, assertive complaint letters for landlord disputes, council issues, employer grievances, NHS complaints and more — ready to send immediately.

Legally-aware language UK-focused rights Download as PDF
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Popular complaint letter templates

Click any template below to jump straight to a pre-filled version of the tool.

🏠 Landlord

Broken boiler / no heating

Landlord failing to repair essential heating or hot water

 🏠 Landlord

Deposit not returned

Landlord withholding deposit without valid deductions

 🏛 Council

Noise complaint to council

Persistent noise nuisance from neighbours or businesses

 💼 Employer

Workplace grievance letter

Formal grievance for unfair treatment, bullying or pay

 📦 Company

Faulty product / refund

Demanding a refund or replacement under Consumer Rights Act

 🏥 NHS

NHS complaint letter

Complaint about treatment, waiting times or staff conduct

How to write an effective complaint letter

A strong complaint letter follows a clear structure that shows you mean business. Here's what every good complaint letter should include:

1. Be specific about dates and facts

Vague complaints are easy to dismiss. Include the exact date the problem started, any dates you reported it, and names of anyone you spoke to. For example: "I reported the damp on 4 March 2025 by email and received no response."

2. Reference your legal rights

For landlord complaints, cite the Landlord and Tenant Act 1985 and your right to a home fit for habitation. For faulty goods, reference the Consumer Rights Act 2015. Our AI automatically includes relevant UK legislation.

3. State clearly what you want

Don't just describe the problem — state the exact remedy you want and a reasonable deadline. "I require the boiler to be repaired by Friday 17 May 2025" is much more actionable than "please sort this out."

4. Warn of escalation

A good complaint letter signals what happens next if they don't act: the local council, Citizens Advice, the ombudsman, Trading Standards, or a solicitor. This shows you're serious and know your rights.

Frequently asked questions

Is this complaint letter generator free? ▾
Yes, completely free. You can generate and download your complaint letter as a PDF with no signup, no subscription, and no hidden fees.
Is the letter legally valid in the UK? ▾
Our AI generates letters that reference relevant UK legislation (Consumer Rights Act 2015, Landlord and Tenant Act 1985, Equality Act 2010, etc.) and follow the conventions expected in formal complaint correspondence. However, this is not legal advice. For serious legal matters, consult a solicitor or Citizens Advice.
Will the recipient know I used AI? ▾
No. The letters are written in a professional, formal style that reads as a standard business letter. You should review the letter and personalise any details before sending.
What if my situation isn't listed? ▾
Choose the closest category and describe your specific situation in the text box. The AI adapts to whatever details you provide — it's not limited to the example categories.
How do I send the letter? ▾
Download the PDF and either email it as an attachment, or print and post it via recorded delivery. Recorded delivery is recommended for formal complaints as it creates a paper trail proving receipt.