Wondering what is a C100 form used for? Learn when you need one, how it works, and what to expect when applying for child arrangements in the UK.
If you’re a parent going through a family dispute, you may have come across something called a C100 form. At first, it can seem confusing. Court forms often look complicated, especially when you’re already dealing with stress and uncertainty.
The good news is that understanding the purpose of a C100 form is much easier than it seems.
If you’re trying to make decisions about Child Arrangements, knowing how this form works can save you time and help you prepare for the next steps.
In this guide, you’ll learn what a C100 form is used for, when you need one, who can apply, and what happens after you submit it.
What Is a C100 Form?
A C100 form is a legal document used in England and Wales when someone asks the family court to make decisions about a child.
Parents usually file this form when they cannot agree on important matters involving their child. Instead of continuing arguments, they ask the court to make a decision that puts the child’s best interests first.
The court carefully looks at the situation before making any orders.
What Is a C100 Form Used For?
The main purpose of a C100 form is to ask the court to make decisions about a child’s care and upbringing.
It is commonly used to request a:
- Child Arrangements Order
- Specific Issue Order
- Prohibited Steps Order
Each order deals with different situations.
Child Arrangements Order
This order decides:
- Where the child will live
- How much time the child spends with each parent
- When visits take place
- How contact happens, whether in person, by phone, or online
This is the most common reason parents submit a C100 form.
Specific Issue Order
Sometimes parents agree on most things but disagree about one important decision.
For example:
- Which school the child should attend
- Whether the child can move abroad
- Medical treatment
- Religious upbringing
A Specific Issue Order asks the court to settle that single disagreement.
Prohibited Steps Order
This order stops someone from making certain decisions without the court’s permission.
Examples include:
- Taking the child overseas
- Changing the child’s school without agreement
- Moving the child to another city
- Changing the child’s surname
The goal is to protect the child’s welfare until the court decides what is best.
When Should You Use a C100 Form?
You should use a C100 form when you have tried to resolve a disagreement but cannot reach an agreement.
Many family disputes can be settled through discussion or mediation. However, when that fails, the court may need to step in.
Common situations include:
- One parent refuses contact.
- Parents cannot agree where the child should live.
- One parent wants to relocate with the child.
- There are ongoing disagreements about schooling.
- One parent wants permission to travel abroad with the child.
The form starts the legal process so the court can review the facts.
Do You Always Need Mediation First?
In many cases, yes.
Before submitting a C100 form, you usually need to attend a Mediation Information and Assessment Meeting (MIAM).
During this meeting, a trained mediator explains whether mediation could help both parents reach an agreement without going to court.
If mediation is suitable and successful, you may never need to file the form.
However, there are exceptions.
You may not need a MIAM if:
- There has been domestic abuse.
- The child is at immediate risk.
- The case is urgent.
- Certain legal exemptions apply.
The mediator or your legal adviser can explain whether an exemption applies to your situation. The UK Government also explains the MIAM requirement as part of the family court application process.
Who Can Apply Using a C100 Form?
Many people can apply, including:
- Parents
- Guardians
- Step-parents in some situations
- Grandparents (sometimes after obtaining permission)
- Anyone with parental responsibility
The court always focuses on what is best for the child rather than simply who submitted the application.
What Information Does the Form Ask For?
The form asks for details about:
- The child
- Both parents
- Other people involved in the child’s life
- Previous court cases
- Safety concerns
- Domestic abuse allegations
- What order you are asking the court to make
You should answer honestly and provide as much accurate information as possible.
Missing information can delay your application.
What Happens After You Submit the Form?
Once the court receives your application, several things usually happen.
1. The Court Reviews Your Application
The court checks that the paperwork has been completed correctly.
2. CAFCASS Becomes Involved
The Children and Family Court Advisory and Support Service (CAFCASS) usually contacts both parents.
Its role is to help the court understand what arrangements are in the child’s best interests.
CAFCASS may:
- Speak with each parent
- Carry out safeguarding checks
- Prepare reports
- Make recommendations
3. A Court Hearing Is Scheduled
The first hearing gives everyone the chance to explain the situation.
Sometimes an agreement is reached during this stage.
If not, the judge may request additional reports or schedule further hearings.
Eventually, the court makes a decision based on the evidence.
How Long Does the Process Take?
Every case is different.
Simple cases where parents cooperate may finish within a few months.
More complex disputes involving safeguarding concerns or multiple hearings can take much longer.
The exact timeline depends on:
- Court availability
- The complexity of the case
- Whether expert reports are needed
- Whether parents can reach agreements during the process
Can You Complete a C100 Form Yourself?
Yes.
Many parents complete the form without hiring a solicitor.
However, it is important to read every section carefully and provide complete information.
If your case involves:
- Domestic abuse
- International relocation
- Serious safeguarding concerns
- Complex legal issues
professional legal advice may be helpful.
Common Mistakes to Avoid
Many delays happen because applicants make simple errors.
Try to avoid these common mistakes.
- Leaving Sections Blank
Complete every relevant section.
If something does not apply, clearly state that.
- Giving Emotional Responses
Stick to the facts.
Avoid using the form to criticize the other parent.
The court wants clear information, not personal attacks.
- Forgetting Supporting Documents
Include any documents requested by the court.
This may include evidence relating to your application.
- Missing Deadlines
Respond promptly to court requests.
Missing deadlines can slow the process.
What Does the Court Focus On?
The court’s main concern is always the child’s welfare.
Judges consider many factors, including:
- The child’s emotional needs
- Physical wellbeing
- Safety
- Stability
- Relationships with parents
- Any risk of harm
The court does not automatically favour one parent over another.
Instead, every decision aims to support the child’s best interests. This principle is set out in the UK’s Children Act 1989.
Can Parents Still Reach an Agreement Later?
Absolutely.
Even after filing a C100 form, parents can continue talking.
Many families reach an agreement before the final hearing.
If this happens, the court may approve the agreed arrangements, helping everyone avoid a lengthy legal process.
Keeping communication respectful often leads to better outcomes for both parents and children.
Final Thoughts
Understanding what is a C100 form used for helps remove much of the uncertainty surrounding family court applications.
The form is designed to help the court make fair decisions when parents cannot agree on important issues affecting a child. Whether the disagreement is about where a child lives, how often they see each parent, or another important decision, the C100 form provides a structured way to ask the court for help.
Although going through the family court process can feel overwhelming, taking time to understand the form, preparing accurate information, and focusing on your child’s wellbeing can make the journey much easier. In many cases, parents are also able to find common ground along the way, reducing conflict and creating more stable arrangements for everyone involved.
