Workplace Mediation: How to Resolve Employee Disputes Before They Reach a Tribunal

Most workplace disputes do not start as legal problems. They start as a rota change nobody explained, a piece of feedback that landed badly, or two capable people who have quietly stopped speaking to each other. Left alone, a surprising number of them end as grievances, resignations or tribunal claims.

If you run a business in Eastbourne, Bexhill-on-Sea or Hastings, the chances are you have seen this pattern at least once. The question is what you do in the weeks before it hardens, and that is where workplace mediation earns its place.

Why early resolution matters: the real cost of workplace conflict

Acas research on the costs of workplace conflict puts the total bill to British employers at around £28.5 billion a year, but the more useful figures sit underneath that headline. Running formal disciplinary and grievance procedures costs UK employers an estimated £2.36 billion a year. Resolving matters informally, which includes workplace mediation, costs around £250 million, roughly a tenth as much. The legal stage, meanwhile, accounts for something in the region of £770 million.

The expensive part of a workplace dispute, in other words, is rarely the tribunal. It is the machinery that grinds into motion long before anyone gets near one. That machinery is also getting heavier: we have written before about how AI-written grievances are making complaints look more formal and more legalistic from the very first email.

That is the argument for mediation, and it is a stronger one this year than it was last year.

What is workplace mediation?

Workplace mediation is a voluntary, confidential conversation between people in dispute, facilitated by an impartial third party who has no stake in the outcome. The mediator does not investigate, does not decide who was right and does not impose anything. Their job is to help the parties work out whether they can find a way of working together, and on what terms.

It is deliberately future-focused. A mediator will let people say what has happened and how it felt, because that usually needs saying, but the useful part of the day is the shift from what went wrong to what happens on Monday morning.

The mediator can be internal or external. The Acas Code of Practice on disciplinary and grievance procedures encourages employers and employees to consider an independent third party and notes that this can be a trained internal mediator, provided they have had no involvement in the matter. Larger employers often train their own. Smaller ones tend to buy the service in, either from Acas or from a private provider.

That emphasis looks set to strengthen. In July 2026 Acas opened a consultation on a redrafted Code, aimed specifically at promoting early and informal resolution of concerns at work. The consultation closed on 23 September 2026 and the final version is awaited. The current Code was issued in 2015 and last fully revised in 2009, so this is a rewrite rather than a tidy-up. Nothing has changed yet and the draft may well shift before it is finalised, but the direction matters because the Code carries real weight. Tribunals must take it into account and can increase or reduce an award by up to 25% where an employer or worker has unreasonably failed to follow it.

There is no statutory regulation of workplace mediators in England and Wales, so accreditation matters. Ask about a mediator's training, accreditation, experience and professional standards, for example registration with the Civil Mediation Council or training accredited by Acas or the CIPD.

Mediation, conciliation and arbitration: what is the difference?

These three terms are used interchangeably, and they do quite different jobs. GOV.UK sets out the distinctions in its guidance on solving a workplace dispute, but in short:

• Mediation is voluntary, informal and usually happens inside the organisation, often before any formal process has begun. Nothing is decided for the parties.
• Conciliation through Acas is aimed squarely at settling a potential or actual tribunal claim. In almost all cases a prospective claimant must notify Acas before lodging a claim, and the conciliator will try to broker a settlement. If one is reached, it is recorded in a COT3 and is legally binding. Under regulations that took effect on 1 December 2025, the early conciliation period now runs for up to twelve weeks rather than six, which gives both sides considerably more room to negotiate.
• Arbitration under the Acas scheme is voluntary but binding and is confined to a narrow category of claims. It is very rarely used.

There is also judicial mediation, offered by an employment judge once a claim is already under way. It can be useful, but by that stage the working relationship is usually beyond saving.

What happens in a workplace mediation?

A typical workplace mediation runs to a day, sometimes less. The mediator meets each person separately first, partly to hear their account and partly to establish what they actually want. A joint session usually follows, though a skilled mediator will not force one if the parties are not ready.

If things resolve, the outcome is written down. It is worth understanding what that document is and is not. A mediation agreement is normally a working arrangement rather than a contract: it records what people have committed to do differently, and it draws its force from the fact that both sides agreed to it. It does not settle legal claims. If someone is giving up the right to bring a tribunal claim, that requires either a COT3 through Acas or a settlement agreement, and a settlement agreement is only valid for this purpose if the employee has received advice from a relevant independent adviser on its terms and effect. Anyone contemplating one should speak to a solicitor before signing.

How confidential is workplace mediation?

Confidentiality is one of mediation's real strengths, but it is often oversold. It usually rests primarily on the mediation agreement and the parties' obligations of confidentiality. In some cases, discussions may also attract without prejudice protection where there is an existing legal dispute and the mediation is a genuine attempt to settle it.

Mediation agreements commonly provide exceptions for matters such as safeguarding concerns, serious risk of harm or information that must be disclosed by law. Confidentiality cannot prevent a worker from making a legally protected whistleblowing disclosure, and courts or tribunals may in limited circumstances require relevant material to be disclosed.

A mediator who tells you that nothing said in the room can ever leave it is overstating their hand. That is worth knowing before you go in, not afterwards.

When mediation is the wrong tool

Mediation works on relationships. It does not establish facts, and it should never be used to avoid establishing them.

Allegations of harassment, discrimination, bullying or serious misconduct need investigating under a proper grievance procedure. An employer who offers mediation as a way of quietly disposing of a harassment complaint is not managing conflict, they are creating a liability, and the position on this is tightening. From 30 October 2026, employers must take "all reasonable steps" to prevent sexual harassment rather than the current "reasonable steps", and will become liable for harassment by third parties such as customers or clients unless they have taken all reasonable steps to prevent it. Steering a complainant towards a private conversation instead of a proper process will not look like a reasonable step. Mediation can sometimes still have a role alongside or after that process, particularly where the parties will continue working together.

Mediation also needs a genuine balance of power and genuine willingness. If one party is being pressured into the room, it will not work.

Where it does have a place after a formal process is in repairing what is left. A grievance can be upheld or dismissed and still leave two people who have to share an office. Mediation is often the only thing that helps at that point.

Why timing matters more than ever: tribunal delays and the Employment Rights Act 2025

Two things have changed the calculation for employers.

The first is delay. The Ministry of Justice tribunal statistics show 70,000 open single employment tribunal claims at the end of June 2026, up 51% on the same period a year earlier. Once multiple claims are included, the overall open caseload stood at 537,000. During April to June alone, tribunals received 14,000 single claims but disposed of only 6,100. Receipts continue to outstrip disposals, so the backlog is still growing. A dispute that goes the distance now hangs over both sides for a very long time.

The second is the Employment Rights Act 2025, which is being brought in over 2026 and 2027. We summarised the first wave in our guide to the employment law changes from April 2026, and Acas has published a plain English summary of what the Act changes and when. From 1 October 2026 the time limit for bringing most tribunal claims increases from three months to six. From January 2027 the qualifying period for unfair dismissal is due to fall from two years to six months, and the cap on compensatory awards is to be removed. Much of the detail still depends on regulations, so treat announced dates as a plan rather than a certainty. The direction, though, is not in doubt: more employees will have the right to claim, and they will have longer to think about it.

Set against that, a day with a mediator looks like a bargain.

The practical point for employers

None of this requires a policy overhaul. It requires managers who notice friction early, a route for raising things informally before anyone reaches for the grievance procedure, and access to someone impartial when a conversation needs a third person in the room. Acas publishes free guidance on workplace mediation covering how it works and how to set it up.

Where a dispute has legal edges, and many of them do, it pays to know that early. If you are unsure whether a situation calls for mediation, an investigation or something else, speak to us before the decision makes itself.

Dealing with a workplace dispute? Speak to our employment solicitors in Eastbourne, Bexhill-on-Sea and Hastings

Our employment solicitors advise employers across East Sussex on grievances, disciplinary procedures, settlement agreements and tribunal claims, and can help you decide whether mediation, investigation or a formal process is the right route for the situation in front of you. Early advice is usually the cheapest advice.

Call us on 01323 434416, email enquiries@stephenrimmer.com or book a free initial 30-minute consultation at our Eastbourne, Bexhill-on-Sea or Hastings office.

FAQs: Workplace mediation

Is a workplace mediation agreement legally binding?

Usually not in the way a contract is. A mediation agreement normally records what each person has agreed to do differently and relies on the parties' commitment to it. It does not settle legal claims. If an employee is giving up the right to bring a tribunal claim, that must be done through a COT3 agreed via Acas or a formal settlement agreement on which the employee has received independent legal advice.

Can an employer make an employee attend mediation?

No. Mediation is voluntary and only works if both people are willing to take part. You can encourage it, explain the benefits and make it easy to access, but pressuring someone into the room undermines the process. An employee who declines mediation keeps the right to raise a formal grievance.

Does mediation replace a grievance or disciplinary procedure?

No. Mediation is an alternative route for resolving disagreements, not a substitute for investigating allegations. Complaints of harassment, discrimination, bullying or serious misconduct should be dealt with under a proper procedure. Mediation can run alongside or after a formal process, particularly to repair a working relationship once the outcome is known.

How much does workplace mediation cost compared with a tribunal claim?

An external workplace mediation typically takes a day and costs a few hundred to a few thousand pounds depending on the provider. A tribunal claim, by contrast, involves management time, legal costs and the risk of an award, and Acas estimates that formal disciplinary and grievance procedures alone cost UK employers over £2 billion a year. With tribunal waiting times at record levels, the gap between the two is widening.

Disclaimer: The content of this website blog is for general awareness and insight. This is not legal or professional advice and readers should not act upon the information provided, they should seek professional advice based on their own particular circumstances. The law may have changed since this article was published.