NOTE Nº 0603 · REV B

Builder Dispute Resolution: A Step-by-Step Guide

The exact escalation order for a dispute with your builder: evidence, informal complaint, formal letter, ADR and court, with timescales and costs at each step.

By The Renovation Notes Team · 5 min read · Published 21 August 2026 · updated within the last month · Sources checked 30 September 2026

Carpenter working on the wooden structure of a house at a construction site under the sun.

In short

Builder disputes resolve fastest when escalated in strict order: gather evidence, raise the issue informally, complain formally in writing, send a letter before action, try mediation or adjudication, and only then issue court proceedings. Each step is cheaper than the next, most disputes die at the formal letter stage, and courts penalise anyone who skips to the end.

When a job sours, the instinct is either to explode or to go straight to “see you in court”. Both lose money. Disputes are a ladder, and the cheap rungs at the bottom resolve most of them, this guide walks the ladder in order, with what each rung costs and how long it takes.

Step 1: Freeze the evidence (today)

Before any conversation: photograph everything relevant, dated; assemble the contract, quotes, invoices, payment records and message history; write a one-page chronology while memory is fresh. Every later step consumes this material, and its quality decides outcomes more than any legal argument. If the issue is technical quality, do this before anyone patches or covers the work.

Step 2: Raise it informally (days 1–7)

A calm, specific conversation, then a short follow-up message confirming what was discussed. Name the defect, the fix you expect, and a reasonable timeframe. Under the Consumer Rights Act your first remedy is repeat performance, the builder fixing their own work at no cost, and most will, because it’s cheaper than losing the balance and the review.¹ Many disputes end here.

Step 3: The formal complaint (week 2)

Same content, formal register, in writing, headed “Formal complaint”. Attach photos, cite the contract clauses or the implied terms, give a deadline (14 days), and state plainly that you’ll escalate if unresolved. If the builder belongs to FMB, TrustMark or a similar scheme, say you’ll engage its complaints process, membership bodies concentrate minds.

Step 4: Letter before action (weeks 3–4)

The formal precursor to legal proceedings, and the single highest-leverage document in the process: many builders who ignored everything else settle here, because it signals you know the route and will walk it. It sets out the claim, the amount, the deadline and your intention to issue proceedings, the construction Pre-Action Protocol expects it, and judges notice when it’s missing.²

If money is flowing the other way, the builder chasing you while defects stand, pair this with a written notice of withholding that says how much you are holding back and why, following any payment-notice procedure in your contract, so your non-payment is structured, not just silent.

Step 5: ADR: mediation or adjudication (weeks 4–10)

Courts expect a genuine attempt at alternative dispute resolution, and can penalise a party that unreasonably refuses it in costs.³ It’s in your interest anyway:

Mediation: a neutral mediator helps you negotiate, most civil mediations finish within a day, and the fee is typically split equally between the two sides.⁴ Best where both sides have a point.
Adjudication: a construction specialist decides, usually within about 28 days of the application.⁵ The statutory right to adjudicate does not apply to a building contract with a homeowner who lives in the property, so it is available only where the contract provides for it (the JCT Home Owner/Occupier contract does).⁶ Faster and more technical than court; costs run higher.
Scheme ADR: trade-body schemes are the cheap route where the builder is a member; the Federation of Master Builders, for example, offers a free dispute resolution service for disputes with its members.⁷

Step 6: Court (month 3+)

Small claims for disputes up to £10,000 in England and Wales, designed for self-representation, with fees on a sliding scale and minimal costs risk.⁸ If the builder disputes a claim of £10,000 or less, you will both be told to attend the court’s free mediation service first.⁹ Above that, the fast track (up to £25,000) and intermediate track (up to £100,000) bring real costs exposure and usually justify a solicitor’s involvement.⁸ Time limits apply (broadly six years from breach), and judges will ask what you did about steps 2–5.¹⁰

The two habits that decide disputes

Run every step in writing (or confirmed in writing), and keep every step proportionate, claim what the evidence supports, concede what’s genuinely fine, and stay the reasonable party in the file. When a judge, adjudicator or mediator reads the correspondence later, the side that stayed measured and documented wins the benefit of every doubt. The deeper guides in this series cover each rung, letters before action, withholding payment, mediation, adjudication, small claims and expert evidence, and the disputes pillar maps them all.

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

References (10)

Figures in this note were checked against the sources below on 30 September 2026. Superscript numbers in the text point to them. Every source the site cites, by topic.

1technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-H89TBVSection 55(1) defines repeat performance as requiring the trader to perform the service again to the extent necessary to complete it in conformity with the contract. Section 55(2) requires the trader to provide it within a reasonable time and without significant inconvenience to the consumer, and to bear any necessary costs incurred in doing so, expressly including the cost of any labour or materials. Section 55(3) removes the right where completing performance in conformity with the contract is impossible. Section 55(4) says what counts as a reasonable time or significant inconvenience is judged by the nature of the service and the purpose for which it was to be performed. This is the legal answer to a builder who offers to come back but wants paying again for the return visit.
2technicalstrong locallyMinistry of Justice, guidance.RN-EP2ZGTThe Civil Procedure Rules pre-action protocol for construction disputes, which requires a letter of claim before proceedings and lets the court treat its standards as the normal approach when judging conduct.
3technicalstrong locallyMinistry of Justice (justice.gov.uk), guidance.RN-H37RZLThe Civil Procedure Rules practice direction on what parties should do before issuing a claim, including the content of a letter before claim and a 14-day response time in a straightforward case.
4technicalvery strongGOV.UK (Ministry of Justice), guidance.RN-F7MCNYGovernment guidance on civil mediation in England and Wales. It says both sides typically pay an equal share of the fee and that most civil mediations are concluded in a day.
5technicalstrongThe Joint Contracts Tribunal, guidance.RN-ET7OBDJCT's adjudication rules written for its Building Contract for a Home Owner/Occupier, giving either party the right to refer a dispute to adjudication.
6technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-5Q1UW1Section 106(1)(a) disapplies Part II of the Act, which contains the statutory adjudication and payment provisions, to a construction contract with a residential occupier. Section 106(2) defines that as a construction contract principally relating to operations on a dwelling which one of the parties occupies or intends to occupy as his residence, with 'dwelling' meaning a dwelling-house or a flat; a dwelling-house does not include a building containing a flat, and a flat means separate self-contained residential premises divided horizontally from another part of the building. Section 106(3) and 106(4) let the Secretary of State amend the definition only by order approved by a resolution of each House. This is the provision that explains why a homeowner has no automatic statutory right to adjudicate against a builder, and why adjudication is only available if the contract itself provides for it.
7technicalgoodFederation of Master Builders, guidance.RN-YA8EQPThe Federation of Master Builders' homeowner guide to working with a builder. It says that where a problem with a Master Builder cannot be resolved directly, the FMB may help through its free dispute resolution service.
8technicalstrong locallyMinistry of Justice (justice.gov.uk), guidance.RN-D9CGJSCPR rule 26.9 sets the scope of each track, with the small claims track as the normal track for claims up to £10,000.
9technicalvery strongGOV.UK (HM Courts and Tribunals Service), guidance.RN-A9L3H7Government guidance for claimants explaining that a disputed claim of £10,000 or less goes to compulsory mediation organised by the court, and that this HMCTS service is free.
10technicalvery strongThe National Archives (legislation.gov.uk), legislation.RN-L5C0B9Section 5 of the Limitation Act 1980: an action founded on simple contract cannot be brought more than six years after the cause of action accrued. This is the six-year limit on suing a builder over a contract that was not executed as a deed, and it runs from the breach, not from when the defect was discovered. The single most important date in a dispute about defective work.