Handling Employee Grievances in the UK: A Guide for Employers

When a worker says they have a problem at work, many employers are unsure what to do next. Some delay the conversation and hope the issue settles down. Others jump straight into a disciplinary process, treat the complaint as a personality clash, or rely on an informal chat without keeping any notes. Those mistakes can turn a manageable workplace concern into a bigger legal and people problem.

If you have asked yourself what is a grievance at work, the short answer is that it is a concern, complaint or problem raised by an employee about something happening in their workplace. For employers in the UK, the real question is how to handle that complaint fairly, consistently and in line with the Acas Code and your own policies. This guide explains what a grievance means in practice, what legal issues to check before you sign off on policies or contracts, where businesses commonly go wrong, and what sensible next steps look like when a complaint lands on your desk.

Overview

A workplace grievance is not just an unhappy comment. It is a formal or informal complaint by an employee about their work, working conditions, treatment by colleagues or managers, or another workplace issue that affects them.

For UK businesses, the main legal risk is usually not the fact that a grievance was raised, but how the employer responded. A poor response can feed into claims about unfair dismissal, discrimination, victimisation, whistleblowing detriment, breach of contract or constructive dismissal.

• Know the difference between an informal concern and a formal grievance.
• Check that your grievance policy reflects the Acas Code of Practice and is being followed in real life.
• Keep written records of complaints, meetings, evidence reviewed and decisions made.
• Separate grievance issues from disciplinary issues where possible, even if they overlap.
• Watch for discrimination, harassment, bullying, whistleblowing or health and safety concerns hidden inside the complaint.
• Give the employee a fair chance to explain the issue and appeal any formal outcome.
• Train managers before you hire your first worker or promote someone into a people management role.

What What Is a Grievance at Work Means For UK Businesses

A grievance at work means an employee is raising a workplace complaint that the business should take seriously and deal with fairly.

In plain English, a grievance is how an employee tells you that something at work is wrong from their perspective. That could be about pay, working hours, management conduct, bullying, discrimination, holiday, workload, working environment, changes to duties, or the behaviour of another employee.

Not every complaint arrives neatly labelled as a grievance. A founder might receive a message saying, “I do not feel comfortable reporting to this manager any more”, or “I think I am being treated differently after returning from maternity leave.” Even if the employee does not use the word grievance, the substance matters more than the label.

Formal and informal grievances

An employee may raise concerns informally first. That might be a conversation with their line manager, founder or HR contact. Sometimes that works, especially where the issue is a misunderstanding or a one-off conflict.

A formal grievance usually means the employee has put the complaint in writing or clearly asked for a formal process. Once that happens, you should move carefully, follow your policy and keep records.

Some businesses make the mistake of forcing every complaint into a formal channel. Others do the opposite and keep serious issues informal for too long. The better approach is to look at the seriousness of the allegation, the people involved and whether an informal solution is realistic and appropriate.

What kinds of issues count as grievances?

A grievance can cover a wide range of workplace problems, including:

• bullying or harassment
• discrimination related to a protected characteristic
• pay disputes, bonuses or commission concerns
• working hours, rest breaks or shift patterns
• health and safety concerns
• concerns about workload or unrealistic expectations
• changes to duties, reporting lines or location
• breach of policy or unfair treatment by a manager
• issues after raising whistleblowing concerns
• complaints about another employee's behaviour

The same set of facts can trigger more than one legal issue. For example, a grievance about repeated jokes in the office might actually involve harassment. A complaint about sudden changes to hours after pregnancy disclosure may raise discrimination concerns. A complaint about being punished after reporting unsafe equipment may overlap with whistleblowing and health and safety rights.

Why grievance handling matters for employers

How you handle a grievance can affect tribunal risk, culture, retention and management credibility.

Tribunals often look at whether an employer acted reasonably and followed a fair process. If an employee later resigns and claims constructive dismissal, your notes, investigation steps and outcome letters may become central evidence. If the issue involves discrimination, your internal handling can also affect how the wider facts are viewed.

There is also a practical business angle. In smaller companies, workplace relationships are close and disruption spreads quickly. A badly managed grievance can knock morale, distract managers and create a sense that complaints are pointless or risky to raise.

The Acas Code and your internal policy

Most UK employers should have a written grievance procedure. The Acas Code of Practice on disciplinary and grievance procedures sets the basic standard expected in many workplace disputes.

Your policy should usually cover:

• who an employee should raise concerns with
• how to make a formal grievance
• how meetings will be arranged
• whether an investigation may be needed
• the right to be accompanied in a formal grievance meeting
• how the outcome will be communicated
• the right of appeal

Having a policy is not enough if managers ignore it. This is where founders often get caught. The business has an employee handbook or workplace policy, but no one has trained the managers, no one knows who should hear an appeal, and no one is sure what to do when the complaint is about the founder or a senior leader.

Who should deal with the grievance?

The person hearing the grievance should be as impartial as possible.

In a larger business, that may be a manager not directly involved in the complaint, with a different person hearing any appeal. In a startup or SME, complete separation is not always possible. Even so, you should still think about conflicts, objectivity and whether an external investigator or adviser may help in more serious cases.

If the complaint is about the employee's direct manager, it should usually be escalated to someone else. If it concerns a director or founder, the company should avoid letting the subject of the complaint control the process.

Legal Issues To Check Before You Sign

Before you sign off on employment contracts, handbooks, settlement discussions or grievance outcomes, make sure the process and documents line up with UK employment law and what actually happened on the ground.

Many grievance problems start long before the complaint itself. They begin with vague contracts, missing policies, inconsistent manager behaviour, or loose verbal promises that are hard to prove later. Here is what to sort out first.

Employment contracts and handbook terms

Your employment contracts and staff handbook should work together, not contradict each other.

Check whether your documents clearly cover:

• the employee's reporting line and role
• pay, bonus and commission wording
• hours, flexibility and place of work
• probation arrangements
• disciplinary and grievance procedures
• anti-bullying, harassment and equal opportunities policies
• sickness absence and family leave policies
• who can make decisions and who can hear appeals

If your grievance concerns a contractual issue, such as pay, duties or notice, the wording matters. Before you rely on a verbal promise made during recruitment or in a hurried management conversation, compare it with the written terms and any later emails. Informal assurances often create disputes when expectations no longer match.

Following the Acas Code in practice

Employers do not have unlimited freedom to improvise once a grievance is raised.

A fair process usually includes:

• receiving and clarifying the complaint
• deciding whether an investigation is needed
• holding a grievance meeting without unreasonable delay
• allowing the employee to explain their concerns
• letting them be accompanied where the formal process applies
• considering the evidence with an open mind
• giving a reasoned written outcome
• offering an appeal

You do not need a court-style process. But you do need one that is fair, proportionate and documented.

Discrimination and protected characteristics

If a grievance touches on sex, race, disability, age, religion or belief, sexual orientation, pregnancy and maternity, gender reassignment, marriage or civil partnership, the complaint may raise Equality Act issues.

This matters because the legal exposure can be much greater than a standard workplace disagreement. A complaint about “communication style” might in fact involve disability-related issues. A return-to-office dispute might involve reasonable adjustments. A grievance after parental leave may involve sex discrimination or maternity-related treatment.

Before you sign any outcome letter, ask whether the complaint could involve:

• direct or indirect discrimination
• harassment
• failure to make reasonable adjustments
• victimisation after a prior complaint
• pregnancy or maternity protections

Whistleblowing and retaliation risks

Some grievances are really disclosures about wrongdoing, not just personal complaints.

If an employee raises concerns about legal breaches, health and safety failings, fraud, or regulatory misconduct, whistleblowing protections may come into play. The wording the employee uses is not decisive. The substance again matters.

The main risk is retaliating, even indirectly. That can include exclusion, poor treatment, blocked promotion, or disciplinary action that appears linked to the complaint.

Suspension, role changes and parallel processes

You should not automatically suspend someone or change reporting lines just because a grievance has been raised.

Sometimes temporary steps are needed to protect staff or preserve an investigation. But those steps should be necessary, reasonable and explained. If you move too quickly, especially against the employee who complained, it may look punitive.

Where a grievance overlaps with a disciplinary issue, avoid muddling the two. For example, if an employee accused of misconduct says the process is biased because of prior discrimination, that grievance may need to be addressed before or alongside the disciplinary process.

Record keeping and data handling

Grievance files often contain sensitive personal information. You should only collect what is needed, limit access, and keep records secure.

Notes should be factual and professional. Avoid casual comments in messages or emails that would look dismissive if disclosed later. In smaller businesses, this is especially important because founders often use informal communication channels for sensitive issues.

You should also think about who has access to the records, how long they will be kept, and how witness information is handled. A clear privacy notice and fair handling both matter here.

Settlement discussions

Some grievances can be resolved through an agreed exit or another negotiated solution, but do not assume that a payment alone fixes the legal problem.

Before you sign any settlement terms, check whether:

• the employee is genuinely willing to engage
• the business has investigated enough to understand the allegations
• there are continuing risks involving other staff
• the agreement is drafted properly for UK employment law purposes
• confidentiality wording is appropriate and not overreaching

A rushed exit can store up future trouble if the underlying management issue remains untouched.

Common Mistakes With What Is a Grievance at Work

The most common mistake is treating a grievance as a nuisance instead of a formal management issue with legal consequences.

That usually shows up in small, familiar decisions that feel convenient in the moment but create problems later.

Ignoring early warning signs

Many formal grievances are the end point of a longer pattern. The employee has raised concerns before, but no one logged them, followed up or checked whether the issue was continuing.

If the same manager keeps attracting complaints, or the same team has repeated conflict, do not treat each incident in isolation. Patterns matter.

Letting the wrong person handle it

A grievance heard by someone too close to the issue will rarely inspire confidence.

Founders often step in because they want to solve things quickly. That can help in very small businesses, but only if they are not involved and can act impartially. If the grievance concerns leadership conduct, a more independent route is usually safer.

Failing to investigate properly

You do not need endless interviews or a forensic review in every case, but you do need enough evidence to make an informed decision.

That may include:

• meeting the employee to clarify the complaint
• reviewing emails, messages or rota records
• speaking to witnesses
• checking previous complaints or management actions
• testing whether policy was followed consistently

Employers sometimes decide too early that “there are two sides to every story” and stop there. That is not a finding. It is a reason to investigate further.

Using careless language in outcomes

The outcome letter should clearly state what you found, what evidence you considered, and what will happen next.

Vague wording creates risk. So does emotional wording. Avoid language that sounds defensive, dismissive or predetermined. If you reject part of the grievance, explain why. If you uphold part of it, set out what action will be taken.

Missing the appeal stage

An appeal is not just a formality. It is part of a fair process and a chance to correct errors.

Some employers issue an outcome and then stall when the employee challenges it. Others let the same person review their own decision. Neither approach is ideal. If possible, an appeal should be heard by someone more senior or not previously involved.

Confusing personality conflict with legal risk

Not every grievance means the business has broken the law. But do not assume a complaint is just a clash of styles either.

A manager may describe an employee as “difficult” when the employee is actually raising a legitimate complaint about disability adjustments, maternity treatment or bullying. Labels can hide the real issue.

Retaliating after the grievance

Retaliation is one of the fastest ways to turn a difficult internal complaint into a serious legal dispute.

Watch for subtle forms of detriment after the grievance, such as:

• sudden negative performance management without proper basis
• removal from meetings or projects
• cold treatment by leadership
• shift changes that appear punitive
• denied opportunities with no clear explanation

Even where the grievance is not upheld, the employee should not be penalised for having raised it in good faith.

Not training managers

A written policy cannot fix poor management habits on its own.

Managers should know when to escalate a complaint, how to avoid promising outcomes too early, how to take notes, and when a grievance may overlap with discrimination, sickness absence, whistleblowing or disciplinary action. Before you hire your first worker or promote a team lead, this is one of the most practical employment law steps to sort out.

FAQs

What is a grievance at work in simple terms?

It is a complaint or concern raised by an employee about something affecting them at work, such as treatment by a manager, pay, workload, discrimination, bullying or working conditions.

Do employers in the UK need a grievance procedure?

Most employers should have a written grievance procedure and should handle complaints consistently with the Acas Code. Even small businesses benefit from a clear policy in the handbook and managers who know how to use it.

Can an employee raise a grievance verbally?

Yes. A grievance can start verbally, especially at an informal stage. If the issue is serious, the employer should still make a written note, clarify the complaint and decide whether the formal process should begin.

How quickly should an employer respond to a grievance?

You should respond without unreasonable delay. The right timing depends on the complexity of the complaint, but employers should avoid letting matters drift, especially where discrimination, bullying or safety concerns are alleged.

Can a grievance lead to an employment tribunal claim?

Yes. A grievance itself is an internal process, but the facts behind it may later support claims such as discrimination, unfair dismissal, constructive dismissal, whistleblowing detriment or breach of contract. Your handling of the grievance can also become part of the evidence.

Key Takeaways

• A grievance at work is an employee complaint about a workplace issue, and the label matters less than the substance of what is being raised.
• UK employers should have a clear grievance policy and follow a fair process consistent with the Acas Code.
• The biggest legal risk often comes from poor handling, such as delay, weak investigation, retaliation, missing appeals or allowing conflicted decision-makers to control the process.
• Always look for hidden legal issues inside the complaint, especially discrimination, harassment, whistleblowing, health and safety concerns, and contractual disputes.
• Good records, careful outcome letters and trained managers make a major difference if a complaint later develops into a formal dispute.
• Small businesses and startups should not assume informal culture replaces proper process, especially before you sign off on policies, contracts or settlement terms.

If you want help with grievance procedures, employment contracts, workplace policies, investigation processes, or settlement terms, you can reach us on 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.