Mediation for Building Disputes: Costs & How It Works

Somewhere between the failed letter and the courtroom is a room (or a video call) with a professional whose whole job is getting deals done between people who currently hate each other. Mediation is confidential and fast, nobody can be made to accept a deal, and most mediations end in a settlement.

What mediation actually is

A trained neutral, often with a construction background, spends a day moving between the parties, testing each side’s case privately, translating positions into numbers and drafting the deal the moment one exists. The mediator has no power to decide anything: the pressure comes from reality-testing (“how will that argument survive a surveyor’s report?”) and from the visible cost of the alternative.¹ Offers made in mediation are “without prejudice”, so they cannot be used against you if the dispute ends up in court, which is what lets both sides be honest about what they’d really accept.¹

The numbers that matter

• Cost: under the Civil Mediation Council’s fixed-fee scheme, a claim of £5,000 to £15,000 costs £320 + VAT per party for a three-hour session, and one of £15,000 to £50,000 costs £445 + VAT per party for four hours.² A full day with a privately appointed mediator costs more: CEDR’s 2025 audit put the average one-day fee at £1,597 for less experienced mediators and £4,044 for more experienced ones, so roughly £800–£2,000 per party when the fee is split.³ Video mediation trims it further.
• Time: an hour to agree to mediate, a fortnight to fix a date, one day to do it. Compare a median of 41 weeks from issue to trial for county court small claims, and 56 weeks for larger claims, in April to June 2026.⁴
• Settlement rates: CEDR’s 2025 audit of mediators found 70% of mediations settling on the day and 87% in total once those settling shortly afterwards are included.³
• The court factor: the civil courts can now order or encourage parties to use ADR as part of managing a case.⁵ When deciding costs, the court considers whether a party unreasonably failed to engage in ADR, so refusing to mediate can cost even a winning party some or all of their costs, and a written offer to mediate is never wasted, even if declined.⁶

If a county court money claim of £10,000 or less is defended, the court refers it to its free telephone mediation service, and attendance is compulsory: an appointment of up to an hour with an HMCTS mediator.⁷ Missing it without good reason can lead to sanctions, including the claim being struck out or paying court costs even if you win.⁷

When mediation fits: and when it doesn’t

Fits: quality and money disputes where both sides have a point; multi-issue tangles (defects + extras + delay) that a court would spend days unpicking; anywhere an ongoing relationship or a half-finished job means you still need cooperation; anywhere the legal costs would dwarf the difference between the parties’ numbers.

Doesn’t: a builder who won’t engage at all (outside the court’s compulsory small claims scheme, mediation needs both sides to agree); pure can’t-pay insolvency situations; cases where you need a precedent or an enforceable ruling against a serial rogue, that’s what court and trading standards are for.

Preparing to win the day

Mediation rewards preparation as much as court does:

1. A one-page chronology and a tidy bundle: contract, photos, quotes, correspondence. The mediator reads fast; make it easy.
2. Your number, and your walk-away, decided in advance, in cold blood: what you’d accept today against the cost, delay and risk of not settling. Remedial quotes and benchmark figures anchor your number to something real.
3. What you can trade, timing of payment, scope of remedial works, who does them, a reference withheld or given. Deals are built from moving parts, not just the headline figure.
4. Authority to settle, both decision-makers in the room.

The deal at the end

Settlements are written and signed on the day, a short agreement stating who pays or does what, by when, “in full and final settlement” of the dispute. Once signed it’s a binding contract, enforceable like any other.⁷ Get remedial work described specifically (what, by whom, by when, what standard), not as “builder to sort the snags”.

If mediation fails, you’ve lost a day and learned the other side’s case, and the next rungs are still there. Most people never need them.

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