Complaint Letter to a Trader: How to Reach “Deadlock”

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Last reviewed: June 2026 · For use in England & Wales · eLitigant is a Community Interest Company (No. 16566612), not a law firm. Always check the current official form on GOV.UK before you file, and sign the statement of truth yourself.

What a stage-1 complaint letter (and “deadlock”) actually is

A stage-1 complaint letter is the first formal step in resolving a dispute with a trader — a shop, garage, builder, holiday firm, energy supplier or any other business. Instead of a phone call you can’t prove happened, you put the problem in writing: what went wrong, the law you rely on, and the precise outcome you want (refund, repair, replacement or compensation), by a stated date.

“Deadlock” is what happens at the end of the business’s own complaints process. When the trader has done all it intends to do and still can’t (or won’t) resolve things, you ask it to confirm that in writing. That written confirmation is a deadlock letter. It matters because most ombudsman and alternative dispute resolution (ADR) schemes will not look at your case until you have either reached deadlock or waited eight weeks since you first complained — whichever comes first (Citizens Advice, “Complaining to an ombudsman”). A deadlock letter therefore lets you escalate without waiting the full eight weeks.

Under the Alternative Dispute Resolution for Consumer Disputes (Competent Authorities and Information) Regulations 2015, once a trader has exhausted its internal complaints procedure it must tell you, on a durable medium (such as a letter or email), the name and website of a relevant ADR provider and whether it is willing to use that scheme. So a well-pitched complaint letter often produces both an answer and, if rejected, the route to the next stage.

When and why to use it

Use a stage-1 complaint letter whenever an informal request has failed and you want a clear, dated paper trail. Common triggers include faulty goods, poor or unfinished services, refused refunds, or a business simply going quiet.

Your underlying rights usually flow from the Consumer Rights Act 2015, which says goods must be of satisfactory quality, fit for purpose and as described, and services must be carried out with reasonable care and skill. For faulty goods you generally have a 30-day short-term right to reject for a full refund; after that you can normally ask for one repair or replacement before claiming a refund or price reduction. (Different timescales apply to services and digital content.)

The letter is worth the effort for three reasons. First, it often resolves the matter — a clear, calm demand citing the law is harder to ignore than a phone call. Second, it builds the evidence you need to escalate. Third, the courts expect it: if you ever issue a small claim, the pre-action conduct rules expect parties to have communicated, exchanged information and considered ADR first, and a judge can penalise a party who refused to try.

What to put in it

• Your details and theirs — your name and address, the business’s name and the right department or named manager.
• The facts, in order — what you bought, when, for how much, the order or account number, and exactly what went wrong, with dates.
• Your legal basis — for example, that goods were not of satisfactory quality under the Consumer Rights Act 2015, or a service was not carried out with reasonable care and skill.
• The remedy you want — be specific: “a full refund of £420”, “a free repair within 14 days”, or “a replacement of the same model”.
• A clear deadline — a reasonable date (often 14 days) by which you expect a substantive reply.
• The escalation signpost — state that if the matter is not resolved you will ask for a deadlock letter and refer the complaint to the relevant ombudsman/ADR scheme, or consider court action.
• Evidence references — list attachments (receipts, photos, the contract, earlier emails) rather than relying on memory.

Keep a copy of everything you send and send it by a method you can prove (email, or post with proof of posting). Stay factual and measured — the tone that wins is firm, not furious.

Common mistakes and pitfalls

• Vague demands. “Sort this out” gives the business nothing to action. Name the figure, the remedy and the date.
• Empty threats. Do not threaten things you can’t lawfully do — for example, threats to post defamatory reviews, harass staff, or “report you to the press”. Reference only genuine options: the trader’s complaints process, an ombudsman/ADR scheme, or a court claim.
• Skipping straight to the ombudsman. Most schemes require you to have complained to the business and reached deadlock or waited eight weeks first; and the trader normally has to be a member of the relevant scheme.
• Forgetting time limits. The 30-day right to reject faulty goods is short. Ombudsman schemes also have their own deadlines (often six months from the deadlock letter), and most court claims for breach of contract must be started within six years.
• Starting court action too early. You generally cannot use an ombudsman once you have issued court proceedings, so try free routes first.
• No paper trail. Verbal promises evaporate. Get every position in writing.

Frequently asked questions

Do I have a right to a deadlock letter?
You can ask for one, and a trader covered by the ADR Regulations 2015 must, once its complaints process is exhausted, tell you in writing about a relevant ADR provider and whether it will use it. Not every trader will issue a formal “deadlock letter” on request — but if it refuses or ignores you, the eight-week rule usually lets you escalate anyway.

Is the ombudsman free?
Yes. Ombudsman and ADR schemes are independent, impartial and free for consumers. The catch is that the trader generally has to belong to the relevant scheme; if it doesn’t, your remaining formal route may be the small claims court.

What if the business just ignores me?
Silence is not a dead end. After about eight weeks you can usually take an unresolved complaint to the relevant ombudsman without a deadlock letter, or — if no scheme covers the trader — consider a money claim. Your dated complaint letter becomes key evidence either way.

This guide is information about the process, not legal advice on your individual case. eLitigant CIC is not a law firm. We draft the document; you check it, sign it and send it.

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A worked example, drafted to a professional standard from your details — ready for you to check, personalise and send. Fictional sample.

CHRIS DRAFTED 📋

Ms Priya Anand
14 Larchfield Road
Bristol BS6 7QT
priya.anand@example.co.uk

The Customer Complaints Manager
Meadowbrook Furnishings Ltd
27 Kingsway Retail Park
Cardiff CF10 4RT

19 June 2026

Formal complaint — order MF-208471 — faulty “Hartwell” three-seater sofa (£899)

Dear Sir or Madam,

I am writing to make a formal complaint about a sofa I bought from your Cardiff store on 3 March 2026 (order number MF-208471), for which I paid £899 by debit card.

Within six weeks of delivery the seam along the right-hand seat cushion split, and the wooden frame now creaks and tilts when sat on. I reported this by telephone on 28 April 2026 and by email on 6 May 2026, and your colleague Mr Davies inspected the sofa on 19 May 2026. To date I have received no firm proposal to put matters right.

Under the Consumer Rights Act 2015, goods must be of satisfactory quality and as described. This sofa is neither, given the seam and frame faults that have appeared in normal household use within weeks of delivery. As you were given the opportunity to inspect and have not offered a repair, I am asking you to provide a replacement of the same model in sound condition, or a full refund of £899, at my option.

I should be grateful for a substantive written reply by 3 July 2026 (14 days from the date of this letter). If we are unable to resolve this, I would ask you to confirm that in writing as a letter of deadlock, and to tell me the name and website of any alternative dispute resolution provider you use, as required under the Alternative Dispute Resolution for Consumer Disputes Regulations 2015. I will then refer this complaint to the relevant ombudsman and, if necessary, consider a claim in the county court.

I enclose copies of my receipt, my emails of 6 May 2026, and photographs of the damaged seam and frame. Please direct all correspondence to me in writing at the address above.

Yours faithfully,

Priya Anand

Enclosures: receipt; email of 6 May 2026; six photographs.