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Separation Agreement with Child Arrangements Explained | LegalDocuments.co.uk

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Part ofFamily & Divorce

Written by Brad Askew Solicitor (non-practising)
Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice.
Updated June 2026 · England & Wales
When a relationship between cohabiting partners comes to an end, the practical questions about where children will live, how time is shared, and who pays for what can feel overwhelming. A separation agreement that deals with child arrangements is one of the ways unmarried couples try to set out, in writing, how they intend to parent going forward. It isn't a court order, and it doesn't carry the same legal weight as arrangements made under the Children Act 1989, but a well-drafted document can reduce friction, create predictability for the children involved, and serve as a reference point if disagreements arise later. This page walks through what typically goes into this kind of agreement, what it can and can't do, and how to think about the decisions you'll need to make before anything is signed.

What this document is

A separation agreement with child arrangements is a written record of what two parents have agreed about living arrangements, contact, decision-making, and financial contributions for their children after they stop living together. For unmarried couples in England & Wales, there's no divorce process to work through, which means there's no automatic court involvement and no financial order made by a judge.

That puts the onus on the parents themselves to document what they've decided. The agreement usually covers two broad areas. The first is the child-focused side: where the children will live, how time is divided between parents, how school holidays and birthdays are handled, and who makes decisions about schooling, healthcare and similar matters.

The second is the financial side, which can include contributions toward the child's upkeep alongside any arrangements about shared property, savings or possessions. It's worth being honest about one thing up front: arrangements relating to children are never fully binding on a court.

A judge will always have the final say on what's in the child's best interests, regardless of what the parents have written down.

How to use this document

  1. Talk it through before drafting. Before putting anything on paper, both parents need an honest conversation about what the day-to-day reality will look like. This covers where the children will spend term time, how weekends and holidays are split, and how you'll handle the unexpected things like illness or school events. Rushing this stage tends to produce agreements that fall apart within months.
  2. Record who the agreement is between. Set out the full legal names and current addresses of both parents, along with the names and dates of birth of each child covered by the arrangement. Being precise here matters because the document needs to clearly identify who has agreed to what, and which children the arrangements apply to if questions come up later.
  3. Set out the living and contact schedule. Describe in practical terms where each child will live and when they'll spend time with the other parent. Many families find it helps to cover term-time routines, school holidays, Christmas, birthdays, and handover arrangements separately rather than relying on vague wording. The more specific the schedule, the less room there is for misunderstanding later on.
  4. Address decision-making and financial contributions. Explain how significant decisions about the children's education, medical care, religion and travel will be handled, whether jointly, or by the parent the child primarily lives with. Cover financial contributions toward the children's costs, bearing in mind that statutory child maintenance rules apply regardless of what any private agreement says.
  5. Review, sign, and keep it under review. Both parents should read the agreement carefully, ideally after a break from drafting, and consider whether to take independent guidance before signing. Once signed and dated by both parties, keep copies safe. Arrangements should be revisited as children grow, because what works for a five-year-old rarely works for a fifteen-year-old.

Common questions

Q Is a separation agreement with child arrangements legally binding?
Not entirely. Courts in England & Wales retain the power to decide what's in a child's best interests, so any part of the agreement dealing with children can be revisited by a judge if disputes arise. That said, a written agreement carries weight as evidence of what both parents intended, and many families rely on one for years without needing court involvement at all.
Q How is this different from a Child Arrangements Order?
A Child Arrangements Order is made by the Family Court under the Children Act 1989 and is legally enforceable. A separation agreement is a private document between two parents and does not have the same force. Many couples start with an agreement and only apply to court if things break down. Court should generally be a last resort where parents can't reach workable arrangements themselves.
Q Does a private agreement override the Child Maintenance Service?
No. Either parent can apply to the Child Maintenance Service at any time, and the statutory calculation will apply regardless of what's been privately agreed. A family-based arrangement can work well if both parents stick to it, but it doesn't remove the right of either party to go through the CMS route later if circumstances change.
Q Do unmarried fathers automatically have parental responsibility?
Not always. A father acquires parental responsibility automatically if he's named on the child's birth certificate (for births registered in England & Wales from December 2003 onwards). Before that date, or where the father isn't on the certificate, parental responsibility usually needs to be acquired through agreement with the mother or a court order.
Q Should both parents get independent guidance before signing?
It's generally sensible. Each parent having their own conversation with someone independent helps make sure both understand what they're agreeing to and that neither feels pressured. It also reduces the risk of one party later arguing that the agreement was entered into without properly understanding its effect.
Q What happens if one parent stops following the agreement?
Because child arrangements in a private agreement aren't directly enforceable as a court order would be, the usual first step is to try mediation. If that doesn't work, either parent can apply to the Family Court for a Child Arrangements Order. The existing agreement will typically be considered as evidence of what was previously agreed between you.
Q Can the agreement be changed after it's signed?
Yes, and it usually should be as children grow and circumstances shift. The simplest route is for both parents to agree revisions in writing and sign a dated amendment. If you can't reach agreement on changes, mediation is normally the next step before anyone considers court, particularly for arrangements that have been running reasonably well.

Sources

This guide is based on primary UK law and official guidance.

Brad Askew, Solicitor (non-practising)

Written & reviewed by

Brad Askew Solicitor (non-practising)

Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.

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Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.