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 cohabiting relationship ends, the financial fallout can feel more uncertain than it does for married couples. The law in England and Wales simply does not extend the same automatic protections to unmarried partners, and the myth of the 'common law marriage' still trips people up at the worst possible moment.
That is where a separation agreement earns its keep. It is a written record of how you and your former partner intend to divide what you built together, the home, the savings, the debts, the practical arrangements, so that neither of you is left guessing or arguing months down the line.
On this page I have pulled together what a separation agreement actually does for cohabitees, where its limits lie, and how to think about getting one in place. If you want to talk any of it through before making decisions, a call with one of our experienced legal advisers is available at the bottom.
What this document is
A separation agreement (sometimes called a deed of separation) is a written contract between two people who have lived together and are now going their separate ways. It sets out, in plain terms, what happens to the property, money, belongings and liabilities that accumulated during the relationship.
For cohabiting couples in particular, this matters more than most realise, because unlike divorce, there is no family court framework automatically dividing assets when unmarried partners split up. Whatever the agreement says is, in most respects, what the parties have chosen for themselves.
The document typically covers who keeps or sells the home, how equity is split, who takes on which debts, whether any ongoing payments will be made between the parties, and how jointly held belongings are divided. While a separation agreement is not automatically binding in the same way a court order is, a properly drafted one, entered into freely, with full financial disclosure and the benefit of independent input, will usually carry real weight if a dispute later lands in court. It brings structure to a situation that, without it, tends to drift into disagreement.
How to use this document
Take stock of what you actually own and owe. Before anything is drafted, both parties need a clear picture of the finances. That means listing the property, bank accounts, pensions, vehicles, valuables and debts, and flagging which are in sole names and which are joint. Full and honest disclosure from both sides is what gives the eventual agreement its credibility if it is ever tested.
Work out what a fair split looks like. Cohabitees do not have the matrimonial framework to lean on, so the starting point is usually strict legal ownership, adjusted for what each person contributed. Think about deposits paid, mortgage payments made, improvements funded and any promises relied on. This is the stage where a conversation with an experienced legal adviser can help you think through what is realistic based on what you describe.
Agree the terms between you. With the numbers on the table, the two of you need to reach agreement on the headline points, who stays in the home, how and when it is sold or bought out, how joint accounts and debts are closed or transferred, and whether any payments will pass between you. Getting to a shared position before drafting saves significant time and cost.
Have the agreement properly drafted. A separation agreement needs to be written carefully, reflecting what was agreed and anticipating the practicalities of carrying it out. Dates, mechanisms for transfer, responsibility for costs, and what happens if one party does not comply all need to be spelt out. Loose wording is where future disputes are born.
Sign it with independent input and keep it safe. For the agreement to carry maximum weight, each party should ideally take their own independent legal input before signing, and both should sign freely without pressure. Once executed, usually as a deed, each party keeps a signed copy. If circumstances change significantly later, the agreement can be reviewed and varied by mutual consent.
Q Is a separation agreement legally binding if we were never married?
A separation agreement between cohabitees is a contract, and the courts in England and Wales will generally uphold one that was entered into freely, with full financial disclosure on both sides, and where each party had the chance to take independent input. It is not automatically binding in the way a consent order in divorce is, but a well-drafted agreement carries substantial persuasive weight if challenged.
Q Do we really need one if we are splitting amicably?
Amicable today does not always mean amicable in twelve months, particularly once new partners, new homes or new financial pressures come into the picture. A separation agreement captures what you both agreed at a moment when you were on the same page. It protects both of you from later disagreement about who said what, and it gives lenders, conveyancers and HMRC a clear record to work from.
Q What happens to the house if only one of us is on the title?
Legal ownership is the starting point, but it is not always the end of the story. If the person not on the title contributed financially or acted on assurances about ownership, they may have a beneficial interest under trust principles. This area gets complicated quickly, and it is exactly the sort of thing worth talking through before assuming the house belongs entirely to the named owner.
Q Can a separation agreement cover arrangements for our children?
Financial arrangements for children can be noted in the agreement, but decisions about where children live and how time is shared with each parent cannot be contracted away, the court always retains oversight of what is in a child's welfare. Child maintenance is ultimately governed by the Child Maintenance Service framework, so any figures agreed need to sit sensibly alongside that.
Q How is this different from a cohabitation agreement?
A cohabitation agreement is put in place while a couple is living together, setting ground rules for how finances and property work during the relationship. A separation agreement is the other bookend, it records how things are unwound when the relationship ends. Some couples have both; many only realise they needed one when they reach the point of needing the other.
Q Can we change the agreement later?
Yes. A separation agreement can be varied if both parties consent, and any variation should be put in writing and signed in the same careful way as the original. If circumstances change substantially, a significant shift in income, health, or living arrangements, it is sensible to revisit the document rather than letting it quietly fall out of step with reality.
Q Do we each need our own legal input?
You are not legally required to, but it is strongly advisable. An agreement where each party had independent input is far harder to challenge later, because neither side can claim they did not understand what they were signing or were pressured into terms. It is one of the single biggest factors in how much weight a court gives the document if a dispute arises.
Separating as a cohabiting couple throws up questions the law does not answer neatly, from who has a claim on the house to how joint debts get closed out. An experienced legal adviser can talk through your specific situation on the phone and help you think about what a sensible separation agreement might need to cover, based on what you describe.
✓Plain-English answers to your specific questions about separating
✓Practical perspective on property, debts and finances based on what you describe
✓What to watch out for when reaching an agreement with your ex-partner
✓Clarity on your next steps before you commit anything to writing
Personal call · For information only · Independent advisers
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.
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.