Letter Before Action to a Builder: Guide & Template

Somewhere between complaining and suing sits the most effective document in consumer law: the letter before action. It costs a stamp, takes an evening, and resolves a remarkable share of building disputes, because it converts you, in the builder’s eyes, from an annoyed customer into a litigant who knows the procedure.

What it is, legally

Civil courts expect parties to follow pre-action conduct rules, and construction disputes have their own Pre-Action Protocol.¹ The core requirement: before issuing a claim, send a letter setting out your case and give the other side a reasonable chance to respond.² Skip it and a court can stay your claim or punish you on costs even if you win.² Send it properly and you’ve both strengthened your position and, more often than not, triggered settlement without ever issuing.

What it must contain

The Practice Direction on pre-action conduct says the letter should give the basis of the claim, a summary of the facts, what you want from the builder and, if it is money, how the amount is calculated.²

1. The parties and the agreement, who contracted with whom, when, for what work, at what price; reference the written contract or quote.
2. What went wrong, the defects, non-completion or overcharge, stated specifically and by reference to evidence (“out-of-level floor to rear bedroom, 30mm across 3m, photos enclosed”).
3. What you’ve done so far, the complaint history, their responses or silence.
4. The remedy and the number, repair by a stated date, or payment of a stated sum, with the calculation shown (quotes for remedial work, refund arithmetic).
5. The deadline, 14 days to respond is standard for straightforward matters. The Practice Direction treats 14 days as a reasonable time to reply in a straightforward case and no more than 3 months in a very complex one, while the construction protocol gives a builder 28 days to send a full letter of response.¹²
6. The consequence, that you will issue court proceedings without further notice, and will seek interest and costs.

Enclose copies (never originals) of the key documents, send by email and post, and keep proof of both.

A template to adapt

Dear [name],

Letter before action, [address of works]

On [date] we agreed you would [scope] for £[sum], as set out in [quote/contract ref]. I have paid £[amount] to date.

The following work is defective/incomplete: [numbered list, with evidence references].

I raised these matters on [dates] and [summary of response/none].

Under the Consumer Rights Act 2015 this work should have been carried out with reasonable care and skill. I require you to [rectify the listed items / pay £X, calculated as attached] within 14 days of the date of this letter.

If I do not receive a satisfactory response, I will issue proceedings against you in the county court without further notice, and will seek interest and costs. I am willing to consider mediation.

Yours sincerely,

The reference to reasonable care and skill comes from section 49 of the Consumer Rights Act 2015, which treats every contract to supply a service as including a term that the trader must perform it with reasonable care and skill.³

That final sentence about mediation matters, and costs you nothing: if proceedings follow, the court may ask for evidence that ADR was considered, and a refusal to take part can be treated as unreasonable and cost the refusing party more.²

Tone: the file, not the fight

Write for the judge who may eventually read it, not for the builder who annoyed you. No sarcasm, no adjectives, no history of every irritation, just agreement, breach, remedy, deadline. A measured letter from a homeowner reads as dangerous; a furious one reads as venting.

After you send it

• They respond and negotiate, the common outcome. Any settlement goes in writing (“in full and final settlement of…”) before a penny moves.
• They dispute everything, their response frames the real issues; consider an independent expert report on the technical points, then mediation.
• Silence, issue the claim when the deadline passes. Doing exactly what you said, on the day you said, is the whole game; a letter before action you don’t follow through teaches the builder you’re bluffing.

For claims of £10,000 or less the next step is usually small claims court; the wider escalation ladder is mapped in our step-by-step dispute guide.⁴

This guide is general information for homeowners in England and Wales, not legal advice.