C100 Form Explained
The C100 form is used when applying to the family court about arrangements for children.
This page explains what the C100 form is, when it is used, how it links to mediation, and what to consider before completing it.
What is the C100 form?
The C100 form is a court application form used in England & Wales for certain child-related matters.
People commonly use it when asking the court to make decisions about arrangements for children, such as where a child lives or how they spend time with each parent.
When is the C100 form used?
People often consider completing a C100 form when:
- They cannot reach agreement about arrangements for children
- Communication has broken down
- Informal arrangements are no longer working
Applying to court is usually a later step, after other options have been explored.
The role of mediation
Before applying to court, parents are usually encouraged to explore whether mediation could help.
Mediation provides a structured, neutral space to discuss child arrangements and explore practical solutions where it is safe and appropriate.
MIAMs and the C100 form
A MIAM (Mediation Information and Assessment Meeting) is usually expected before submitting a C100 form.
The MIAM helps assess whether mediation may be suitable and explains available options.
After a MIAM, a mediator may issue a MIAM certificate, which is commonly required when submitting the C100 form.
Are there any exemptions?
In some situations, a MIAM may not be required before applying to court.
These situations are known as MIAM exemptions and depend on individual circumstances.
What information does the C100 form ask for?
The C100 form usually asks for information about:
- The children involved
- The people making the application
- The type of arrangements being requested
- Whether mediation has been considered
- Any relevant safety information
The form is designed to help the court understand the situation at a high level.
Download the official C100 form
External link to GOV.UK
Help with completing the C100 form
Some people find it helpful to use an independent step-by-step guide when working through the form.
The resource below is provided by a third party and is not part of this website or GOV.UK.
This link is provided for general guidance only.
Alternatives to court
Many parents reach workable arrangements without court involvement.
Tools that may help include:
- Parenting plans
- Mediation
- Structured discussions supported by professionals
Common questions
What is a C100 form?
A C100 form is the application used to ask the family court to make a decision about child arrangements, such as where a child lives or how much time they spend with each parent.
Do I need a MIAM before submitting a C100?
In most cases, yes. You are required to attend a Mediation Information and Assessment Meeting (MIAM) before applying to court, unless an exemption applies.
Can I fill in a C100 form myself?
Yes. Many people complete the C100 form themselves, though some choose to seek help from a solicitor or legal adviser to ensure the application is accurate.
When you're ready
If you would like support to explore child arrangements before applying to court, a MIAM can help you understand whether mediation may be suitable.
Book a MIAM onlineDelivered by qualified family mediators in England & Wales.
Court forms can feel intimidating. Understanding what the C100 form is for — and the options available before using it — can help you approach next steps with greater clarity and confidence.