When Team Complaints Start to Build: A Practical Guide for Line Managers

For many line managers, some of the most difficult workplace situations do not begin with a formal grievance. They begin much earlier, often with a quiet conversation after a meeting, a concern raised during a one-to-one, a complaint about a colleague’s tone, or a growing sense that two members of the team are no longer working well together. At that stage, there may be no written complaint, no formal allegation and no obvious requirement to begin a formal process, yet this is often the point at which the manager’s response matters most. Handled well, an early concern can sometimes be resolved before it becomes entrenched. Handled poorly, inconsistently or too late, what initially appears to be a relatively contained disagreement can develop into a wider team problem, damage working relationships and ultimately become a formal grievance.

The Line Manager Is Often the First Person to Know About Team Complaints

HR may eventually become involved in a difficult workplace dispute, but line managers are frequently the first people to recognise that something is going wrong. They are usually closest to the day-to-day interactions within the team and may notice changes before anyone raises a formal concern. Meetings become uncomfortable, communication becomes shorter, colleagues begin avoiding one another, minor disagreements start recurring and people who previously worked well together appear increasingly frustrated or defensive. Sometimes an employee will raise the issue directly, saying they feel excluded, undermined, unfairly criticised or simply unable to work effectively with a colleague. They may not describe what is happening as bullying, harassment or a grievance, but it is clear that something is affecting both them and the team.

The temptation for managers can be to deal with the issue quickly and move on, particularly when they are already balancing performance, deadlines, operational responsibilities and wider people-management demands. That is understandable, but what feels like a relatively minor concern to a manager may already feel significant to the employee raising it. This is why the first response matters so much. Employees will often take their cue from how seriously their concern is treated, and a dismissive or overly casual response can make an issue harder to resolve later.

Listen Before Trying to Solve

One of the most common mistakes in early workplace conflict is moving too quickly into problem-solving. An employee raises a concern and the manager immediately suggests what they should do, explains why the other person may have behaved in a certain way, or reassures them that the matter is probably just a misunderstanding. These responses are usually well intentioned, but they can leave the employee feeling that their concern has been minimised before it has been properly understood.

The first task should usually be to listen carefully and establish what has actually happened. That means asking sensible questions about the nature of the concern, how long it has been going on, whether it is an isolated incident or part of a broader pattern, how it is affecting the individual and their work, and whether any attempt has already been made to address the matter directly.

Managers do not need to agree with every interpretation they hear, nor should they immediately decide who is right or wrong. The purpose at this stage is to understand the concern well enough to make a sensible judgement about what should happen next. Listening is not the same as accepting an allegation as fact; it is about ensuring that the person has been heard and that the manager has sufficient information to respond proportionately.

Avoid Making Promises You Cannot Keep

Workplace complaints often become more difficult when expectations are created too early. A manager may instinctively say, “I’ll sort this out,” or promise that the conversation will remain entirely confidential, without fully considering what those assurances mean in practice. In some circumstances, the manager may need to involve HR, seek advice from another senior colleague or speak to the person complained about. Where serious allegations are raised, there may also be a clear organisational duty to take further action. Complete confidentiality therefore cannot always be guaranteed.

It is usually better to be transparent from the outset. A manager can listen sensitively while also explaining that some information may need to be shared if further action is required. Equally, managers should avoid promising a particular outcome before the facts are understood. Their role is not to tell the employee that their complaint will be upheld, nor to reassure them that the other person will be dealt with. It is to ensure that the concern is treated properly, fairly and in accordance with the circumstances.

Informal Does Not Mean Unimportant

One of the most difficult judgements for a line manager is deciding whether an issue can be handled informally or whether it needs to move into a more formal process. There is no single answer, because workplace disputes vary enormously. Some concerns arise from misunderstandings, poor communication, different working styles or unclear expectations. In those situations, a supported conversation or a clear managerial intervention may be enough to resolve the issue. Other matters may involve repeated behaviour, serious allegations or conduct that requires a proper investigation.

What managers should avoid is assuming that because a concern has been raised informally, it can therefore be treated casually. Informal resolution still requires thought and care. If a manager decides to speak to another employee about their behaviour, that conversation should be handled constructively and with sufficient detail. Simply telling someone that “people are complaining about you” can make matters worse. It can create anxiety, defensiveness and suspicion within the team, particularly if the employee begins trying to identify who has raised concerns. It is normally more helpful to focus on specific behaviour, its impact and the expectations that need to be met in future.

Look Beyond the Immediate Team Complaint

When a concern is raised about one colleague, it is easy to focus exclusively on the two individuals involved. Sometimes that is appropriate, but managers should also consider whether the complaint is revealing something wider within the team. Conflict is not always caused by personality alone. It can develop because responsibilities are unclear, workload has become uneven, reporting lines have changed, or people have different expectations about authority and decision-making.

A team that has undergone restructuring, rapid growth or sustained operational pressure may be especially vulnerable to this type of tension. Two colleagues may appear to be in constant disagreement when the real issue is that both believe they are responsible for the same area of work, or neither is clear about where one person’s role ends and the other begins. In those circumstances, treating the matter solely as a relationship problem will not resolve the underlying cause. Good conflict management therefore requires managers to look at both the behaviour of the individuals and the organisational context in which that behaviour is occurring.

Do Not Become the Messenger Between Colleagues

Another common pattern develops when a manager becomes the communication channel between two employees who no longer speak directly. One colleague complains about the other, the manager raises the issue with the second employee, the second employee responds, and the manager carries that response back to the first. Before long, the manager is effectively facilitating an ongoing dispute without either party ever speaking openly to the other.

This rarely improves matters. In fact, it can reinforce the conflict because each employee begins using the manager to validate their own position and avoid direct communication. Where it is safe and appropriate to do so, the objective should be to help colleagues return to a more constructive form of direct engagement. That may involve a supported conversation, clearer expectations about behaviour or, where the situation has become more entrenched, mediation. The manager’s role should be to support resolution rather than become permanently embedded within the disagreement.

Keep Appropriate Records

Managers can sometimes underestimate the importance of keeping a sensible record of early concerns. This does not mean creating a formal case file for every minor disagreement, but where an employee raises a meaningful workplace issue, it is prudent to make an accurate note of what was discussed and any actions that were agreed. If the matter later escalates, that record can provide useful clarity about when the concern was first raised, how it was described and what the organisation did in response.

The quality of those notes matters. Records should be factual, concise and objective, and they should clearly distinguish between what an employee has alleged and what the manager knows to be fact. Language is important here. Writing that “X is bullying Y” is very different from recording that “Y reported that they felt X’s behaviour was intimidating.” The first presents an allegation as an established fact; the second records accurately what was said. Managers should be particularly cautious about including subjective or personal judgements in written records that may later be reviewed as part of a formal process.

Know When to Involve HR in Team Complaints

Good line management does not mean dealing with every workplace problem alone. Managers need to recognise when the issue has moved beyond the point where informal intervention is appropriate or when they simply need advice before taking the next step. Serious or repeated allegations, potentially discriminatory conduct, safeguarding concerns, threats, significant power imbalances or indications that an employee’s health and wellbeing are being seriously affected should all prompt early consideration of HR involvement.

Seeking advice does not automatically mean that a formal grievance procedure must begin. In many cases, HR can help the manager assess the situation, clarify the options available and decide whether informal resolution, mediation, management action or a formal process is most appropriate. Managers who delay asking for support because they feel they should be able to resolve the situation themselves can unintentionally allow a problem to deepen. Knowing when to seek advice is not a sign of weakness; it is part of good management judgement.

Consider Mediation Before Positions Harden

Not every team dispute requires mediation, but there are circumstances in which bringing in an independent mediator can be particularly valuable, especially where colleagues still need to work together but communication has become difficult or trust has begun to deteriorate. Mediation creates a structured and confidential environment in which both parties can discuss what has happened, understand the impact of the conflict and explore practical ways of working together in future.

The purpose is not necessarily to restore a close relationship or persuade the parties to agree on everything. In many workplace disputes, a more realistic and worthwhile outcome is simply a functional professional relationship. That might include agreements about how information is shared, how disagreements are raised, which communication channels are used, or how responsibilities are divided. Introducing mediation before positions become completely entrenched can sometimes prevent an issue from developing into a formal grievance at all.

Managers Set the Tone

The way line managers respond to conflict has a significant effect on team culture. If concerns are routinely dismissed or minimised, employees may stop raising them until the problem has become serious. Equally, if every disagreement is immediately escalated into a formal process, colleagues can become reluctant to have the difficult but necessary conversations that are part of normal working life.

The aim is not to eliminate disagreement. Healthy organisations will always contain people with different opinions, priorities, personalities and working styles. The challenge is to create an environment in which those differences can be managed early, fairly and constructively. That requires managers who are willing to listen, ask sensible questions and address difficult issues rather than avoid them. It also requires organisations to ensure those managers have the training, confidence and support to make good decisions when conflict arises.

Early Action Is Usually Easier Than Late Intervention

After more than two decades working in litigation and dispute resolution, one pattern has remained consistent: disputes rarely become easier simply because they are left alone. Workplace conflict is no different. By the time a grievance is formally submitted, relationships may already be badly damaged, communication may have broken down and the parties may have become firmly attached to their positions.

The most effective intervention often happens much earlier. For line managers, that does not mean taking personal responsibility for solving every disagreement. It means recognising concerns, listening carefully, responding proportionately and knowing when additional support is needed. A complaint raised quietly in a one-to-one may be the earliest opportunity an organisation has to prevent a much larger dispute. How that conversation is handled can make a considerable difference to what happens next.

If you need help with your situation, please speak to Colin for an informal and confidential conversation to explore your options.