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How to challenge a grievance outcome

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Think your grievance decision was wrong or unfair?

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You raised your concerns, provided evidence and waited for your employer’s decision—only to receive an outcome that does not reflect what happened or resolve the problem.

You may be able to challenge the decision through a formal grievance appeal.

Marcas helps you review the outcome, identify clear grounds of appeal and prepare a structured response based on the evidence and procedure—not just your understandable frustration.

Appeal deadlines can be short. Check your employer’s grievance policy and outcome letter as soon as possible.

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Can I appeal a grievance outcome?

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Your employer should offer you the opportunity to appeal a grievance outcome.

An appeal asks your employer to review whether the original decision should be changed or overturned. It can also address failings in the investigation, procedure or action proposed.

You may have grounds to appeal if:

  • Important evidence was ignored

  • Relevant witnesses were not interviewed

  • Part of your grievance was not investigated

  • The outcome contains factual errors

  • The findings are inconsistent with the evidence

  • The investigator had a conflict of interest

  • The grievance procedure was not followed

  • You were not given a fair opportunity to explain your case

  • New evidence has become available

  • The outcome does not resolve an upheld concern

Disagreeing with the decision is not usually enough by itself. A stronger appeal identifies specific problems and explains how they may have affected the outcome.

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How long do I have to appeal?

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Check your grievance outcome letter and employer’s policy immediately. They should explain:

  • Whether you can appeal

  • Who should receive the appeal

  • The deadline

  • What information to include

  • Whether an appeal meeting will be held

 

Time limits vary between organisations. Acas recommends five working days from receiving the outcome as an appropriate period where an employer’s policy does not specify one.

If the deadline has already passed, submit the appeal as soon as possible and explain the reason for the delay. Your employer will decide whether to accept it.

Do not assume that waiting for the grievance or appeal process will extend any separate employment tribunal deadline.

What are valid grounds for a grievance appeal?

 

The investigation was incomplete

You might argue that your employer failed to investigate a significant part of the grievance or did not make reasonable enquiries.

Identify exactly what was missed and why it matters.

For example:

  • A relevant witness was not approached

  • Important correspondence was not reviewed

  • One or more allegations were omitted

  • Conflicting accounts were not examined

  • The investigator did not ask necessary follow-up questions

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Relevant evidence was ignored

Show which evidence was provided, where it can be found and which finding it affects.

Avoid simply sending the entire evidence bundle again. Direct the appeal decision-maker to the specific material that was overlooked or misunderstood.

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The outcome contains factual errors

List each important error separately and provide the correct information.

Concentrate on errors that affected the reasoning or conclusion rather than minor wording that would not change the outcome.

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The findings do not follow the evidence

An outcome may summarise the evidence accurately but reach a conclusion that appears unsupported or inconsistent.

Explain:

  • What finding you are challenging

  • What evidence the employer relied upon

  • What relevant evidence points to a different conclusion

  • Why the reasoning does not adequately resolve the conflict

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The procedure was unfair

Possible procedural concerns could include:

  • The wrong procedure was used

  • You were not told what process would be followed

  • You were not given enough opportunity to present your case

  • The investigator was involved in the events

  • Relevant issues were decided without investigation

  • The decision-maker relied on information you could not address

  • The appeal or grievance policy was not followed

Explain how the procedural failing may have affected the fairness of the decision.

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New evidence has become available

Describe the new evidence, why it is relevant and why it was not reasonably available during the original investigation.

New evidence should normally add something material rather than repeat information already considered.

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The proposed outcome does not resolve the problem

Your employer might uphold part of your grievance without offering action that addresses it.

Explain:

  • Which concern was upheld

  • What problem remains

  • Why the proposed action is insufficient

  • What practical outcome you would like the employer to consider

How to review your grievance outcome

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Read the outcome alongside:

  • Your original grievance

  • Your chronology

  • Your supporting evidence

  • Notes from the grievance meeting

  • The investigation report, if available

  • Your employer’s grievance policy

  • Any correspondence about the process

Your original concern
Employer’s finding
Evidence considered
Possible appeal point

​What you asked the employer to investigate

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Upheld, partially upheld or not upheld

What the outcome refers to

What was missed, incorrect or unfair

How to write a grievance appeal

 

Your appeal should be structured so that the person reviewing it can quickly understand what is being challenged.

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1. Identify the decision

Include the date of the grievance outcome and state that you are formally appealing it.

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2. List your grounds of appeal

Give each ground a separate heading.

For example:

  • Ground 1: Failure to interview a relevant witness

  • Ground 2: Material evidence was not considered

  • Ground 3: Finding based on an incorrect fact

  • Ground 4: Outcome does not address an upheld concern

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3. Explain why each ground matters

Connect the procedural or factual problem to a particular finding.

Do not simply repeat the entire original grievance.

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4. Refer to the evidence

Identify the relevant document, communication, witness or section of the outcome letter.

Make the evidence easy to locate.

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5. State what you want to happen

You could ask your employer to:

  • Reconsider a particular finding

  • Investigate an issue that was omitted

  • Interview an identified witness

  • Review specific evidence

  • Correct a factual error

  • Appoint an impartial appeal manager

  • Overturn or change the original decision

  • Consider a more appropriate resolution

  • Provide clearer reasons for the findings

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6. Keep the tone professional

A measured appeal is generally easier to investigate than one dominated by accusations or emotional language.

You can communicate the seriousness and personal effect of the outcome while remaining focused on facts, evidence and procedure.

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What happens at a grievance appeal meeting?

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Your employer should arrange the appeal without unreasonable delay and give you reasonable time to prepare.

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The appeal should be dealt with impartially and, wherever possible, by someone who was not previously involved in the case.

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At the meeting, be prepared to:

  • Explain why you believe the outcome was wrong or unfair

  • Identify problems with the investigation or procedure

  • Direct the appeal manager to relevant evidence

  • Present any new evidence

  • Answer questions

  • Explain what you would like to happen next

Employees and workers have a statutory right to be accompanied at a grievance appeal hearing by an eligible companion, such as an appropriate colleague or trade union representative.

Check the arrangements with your employer in advance.

Can my grievance appeal make things worse?

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An appeal requires the employer to reconsider the decision, so you should check your organisation’s policy to understand the possible outcomes.

An appeal could result in the original decision being:

  • Confirmed

  • Changed

  • Partially changed

  • Overturned

  • Referred for further investigation

Before appealing, identify what you want reviewed and whether the grounds are supported by evidence or a meaningful procedural concern.

What if my employer refuses an appeal?

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Ask your employer to confirm its position and reasons in writing.

Refer to:

  • Your grievance outcome letter

  • The organisation’s grievance policy

  • The Acas Code of Practice

  • Any relevant appeal deadline you have met

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The Acas Code says employees should be given the opportunity to appeal a grievance outcome.

If the employer still refuses, consider contacting Acas, your trade union or an employment law professional for guidance on your circumstances.

What if my grievance appeal is unsuccessful?

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Your employer should provide the appeal decision in writing and explain whether it is final.

Review whether:

  • Your grounds of appeal were addressed

  • Further evidence was considered

  • The appeal was handled impartially

  • Clear reasons were provided

  • Any promised action resolves the workplace problem

  • Another internal stage is available

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Depending on the circumstances, possible next steps might include:

  • Asking for agreed actions to be implemented

  • Using another relevant internal procedure

  • Exploring mediation

  • Contacting your trade union

  • Seeking independent employment advice

  • Notifying Acas about Early Conciliation

  • Considering whether an employment tribunal claim may be available

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A grievance appeal and an employment tribunal claim are different processes. An unsuccessful grievance does not automatically mean that you have or do not have a legal claim.

Do not lose track of legal time limits

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Employment tribunal time limits are strict and depend on the type of claim.

In many cases, the time limit is three months minus one day from the event being complained about. Completing an internal grievance or appeal does not normally stop or extend that deadline.

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If you think you may have a legal claim, contact Acas or obtain independent legal advice promptly rather than waiting for the internal process to finish.

Marcas provides practical workplace case support and does not replace advice from a qualified legal professional.

How Marcas helps with your grievance appeal

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Marcas helps you turn a disappointing grievance outcome into a structured appeal.

You can use Marcas to:

  • Compare the outcome with your original grievance

  • Check whether every concern was addressed

  • Identify evidence that may have been missed

  • Record factual and procedural problems

  • Separate strong appeal grounds from general disagreement

  • Organise new evidence

  • Clarify the outcome you want

  • Prepare a professional appeal letter

  • Get ready for the appeal meeting

  • Build a record of the complete grievance process

You remain in control of your case and the decisions you make.

Frequently asked questions

 

What should I write in a grievance appeal?

Identify the outcome you are appealing, set out each ground clearly, refer to the relevant evidence and explain what you want your employer to do next.

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Can I appeal because my grievance was not upheld?

Yes, but explain why you believe the decision was wrong or unfair. Identify errors, missing evidence, an incomplete investigation or a procedural problem rather than relying only on disagreement.

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Can I introduce new evidence during an appeal?

You can present new evidence. Explain why it is relevant and why it was not available or provided during the original grievance investigation.

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Can I appeal a partially upheld grievance?

Yes. You can challenge the findings that were not upheld or argue that the proposed action does not adequately resolve the parts that were upheld.

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Who should hear my grievance appeal?

Wherever possible, it should be handled impartially by someone who was not previously involved and who has authority to reconsider the decision.

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Can I bring someone to my grievance appeal meeting?

Employees and workers have the right to be accompanied at a grievance appeal hearing by an eligible companion, normally a workplace colleague or qualifying trade union representative.

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How long should a grievance appeal take?

There is no single fixed timescale for every appeal. It should be handled without unreasonable delay while giving you reasonable time to prepare. Check your employer’s policy for its stated timescales.

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Does appealing extend my employment tribunal deadline?

No. Going through a grievance or appeal procedure does not normally change the time limit for notifying Acas or bringing a tribunal claim.

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What if my employer ignores my appeal?

Follow up in writing, refer to the relevant policy and keep a record of your attempts to obtain a response. Consider contacting Acas, your trade union or an employment law professional if the delay continues.

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