Employee grievance procedure UK: step-by-step guide for employers

What counts as an employee grievance?

An employee grievance is a formal complaint raised by an employee about something at work. It might relate to their manager, a colleague, workload, bullying, discrimination, pay, working conditions or how a decision has been handled.

Sometimes people raise concerns informally first. If the issue is serious, repeated, or the employee asks for it to be treated formally, you should move into your grievance process and deal with it consistently. For a broader overview of the HR basics that sit around this, see our guide on HR compliance basics for UK small businesses.

Not every complaint becomes a grievance, but it is safer to treat any written or clearly stated formal concern as one. The key is to respond promptly, stay neutral and keep the process proportionate to the issue.

Step 1: Acknowledge the complaint and check your policy

Start by acknowledging the grievance quickly. You do not need to solve everything immediately, but the employee should know you have received their complaint and that you are taking it seriously.

Next, check your grievance policy and any related procedures. If you have an employee handbook or contract references to grievance handling, follow those steps unless there is a strong reason not to. Consistency matters: employees should see that the process is being applied fairly, not improvised from one case to the next.

If your business does not yet have a clear policy, it is worth fixing that as soon as possible. Many SME owners find that a little HR consultancy support helps them put practical procedures in place without creating unnecessary paperwork.

Keep the acknowledgement simple. Confirm who will handle the matter, what happens next, and any immediate timescales. If the grievance involves the employee’s direct manager, consider appointing someone else to manage the process to keep it impartial.

• Acknowledge the grievance promptly and in writing if possible.
• Check your policy before taking further action.
• Appoint someone impartial where there may be a conflict of interest.
• Explain the next step and expected timescale.

Step 2: Investigate fairly and gather evidence

The investigation is where many employers either get it right or create unnecessary risk. Your job is not to prove a point; it is to gather enough information to understand what happened and make a fair decision.

That usually means reviewing relevant documents, emails, rota records, HR files, messages or policies, and speaking to the people involved. You may also need witness statements or notes from meetings. Keep your questions focused on the facts rather than opinions.

Aim to be thorough but proportionate. A simple grievance may need only a few conversations, while a more complex complaint may require a fuller evidence trail. If the issue is affecting wider team relations or is tied to a performance or conduct concern, employee relations support can help you manage the process without becoming bogged down in it.

It is also important to keep the matter confidential as far as possible. Only involve people who genuinely need to know, and avoid discussing details informally across the business.

Step 3: Hold a grievance meeting and let the employee respond

Once you have enough initial information, invite the employee to a grievance meeting. This is their chance to explain the complaint, clarify anything in writing and answer follow-up questions. They should be told in advance that they can bring relevant documents and, where appropriate, be accompanied in line with your policy and the Acas Code of Practice.

The meeting should feel structured but not formal or intimidating. Start by explaining the purpose, then go through the concern point by point. Listen carefully, take notes and allow the employee to respond fully. If the grievance raises issues about another employee, make sure you handle that person’s confidentiality and right to respond appropriately as well.

Avoid trying to close the matter too early. Even when the facts seem clear, the employee must be given a proper opportunity to explain their view. That is a core part of fair grievance handling and helps reduce the chance of misunderstandings later.

If your team is stretched, using outsourced HR support can give you an experienced hand to structure meetings, keep records and stay consistent throughout the process.

• Send a clear invitation with the meeting date, purpose and who will attend.
• Allow the employee to explain their concern in full.
• Take notes and keep the discussion focused on facts.
• Consider accompaniment rights where applicable.
• Plan for follow-up questions if more evidence is needed.

Step 4: Decide the outcome, confirm it in writing, and explain next steps

After the investigation and meeting, review all the evidence and decide what action is appropriate. The outcome might be that the grievance is upheld, partially upheld or not upheld. In some cases, the best resolution may be a change in process, further training, mediation, an apology or a management action plan.

Whatever the decision, confirm it in writing. The employee should understand what was considered, what decision was reached and why. Be clear about any actions you will take and the timescale for doing them. If the complaint relates to a wider people issue, you may also want to review the underlying policy or manager practice so the same problem does not reappear.

If the grievance is about someone else’s behaviour or a relationship issue, think carefully about how to preserve trust on both sides. Clear communication is essential, but so is discretion. A good outcome is not always about satisfying every request; it is about showing a fair process and a sensible business response.

You should also explain whether there is a right of appeal and how that works. Even if your team is small, a simple appeal step helps show the process has been handled properly.

Common grievance handling mistakes UK employers should avoid

The most common mistake is leaving things too long. Delays create frustration, give room for assumptions and make it harder to find reliable evidence. A second mistake is treating the issue informally when the employee clearly wants a formal response.

Another frequent problem is lack of consistency. If one complaint gets a full investigation and another is brushed aside, employees will notice. That can quickly affect confidence in managers and the wider culture. It is worth reading our guide to common HR mistakes small businesses make if you want to spot other weak points in your process.

Employers also sometimes let the wrong person handle the grievance. If the complaint is about a direct manager, that manager should usually not investigate their own conduct or decision. Independence matters, even in a small business.

Finally, do not promise a particular result before the facts are known. Stay neutral, keep records and avoid casual comments that could later be taken as bias.

• Delaying the process unnecessarily
• Ignoring the employee’s preference for a formal grievance
• Using an inconsistent approach between cases
• Allowing a conflicted manager to lead the process
• Making assumptions before reviewing the evidence
• Failing to explain the outcome or appeal route

When to bring in HR support for grievances and employee relations

If a grievance involves senior staff, allegations of bullying or discrimination, repeated complaints, or a conflict between team members that could affect the wider business, it is sensible to bring in outside support early. The same applies if you are not confident about the process, or if the issue is landing alongside absence, performance or disciplinary concerns.

Small businesses often assume they need a full HR department to handle this work well. They do not. A practical HR partner can step in only where needed, help you manage the process and keep relationships on track. That is often more cost-effective than waiting until a problem becomes much harder to unwind.

Flora HR supports UK SMEs with sensible, plain-English employee relations advice, from one-off grievance cases to broader HR consultancy and ongoing outsourced HR support. If you want a trusted contact to help you handle a sensitive case properly, Flora HR is the trusted contact brand behind the micro-site and can connect you to the right support through the Flora HR team.

When handled well, a grievance does not have to damage working relationships. In many cases, a calm process gives everyone a clearer path forward and helps the business move on with more confidence.