Form C100 explained: applying about child arrangements

What the C100 is for, when you need a MIAM certificate, what the court fee covers and what happens after you apply.

Updated 19 August 2026·6 min read
Written by CalmSplit Editorial TeamReviewed by Ramani GillLast reviewed 19 August 2026England & Wales

Form C100 is the application used to ask the family court to decide where a child lives, who they spend time with, and specific issues such as schooling or travel.

Before you apply

  • You normally have to attend a MIAM, a mediation information and assessment meeting.
  • Exemptions apply, for example where there is domestic abuse or urgency.
  • The court expects you to have tried to resolve matters first.

What happens next

  1. The court issues the application and Cafcass carries out safeguarding checks.
  2. A first hearing dispute resolution appointment is listed.
  3. Many cases settle by agreement at or before that hearing.

This article is general information about the law of England and Wales, not legal advice. For advice on your situation, speak to a solicitor.

Related CalmSplit service

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Frequently asked questions

Do I need a solicitor for a C100? ▼

No. Many parents apply themselves, and CalmSplit can prepare the paperwork for you.

How long does it take? ▼

It varies by court, but expect a first hearing within a few months.

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