Cohabitation Agreements in the UK: Legal Protections for Unmarried Couples

Cohabitation agreements in the UK are becoming one of the most searched-for legal topics among couples who live together but haven’t married. And it’s not hard to see why. Roughly 6.5 million couples in the UK now live together without marrying or entering a civil partnership, up from 5.5 million just a decade ago, according to Office for National Statistics figures. Yet most of them believe a myth that could leave them financially exposed: common law marriage.

There is no such thing. Living together for five years, ten years, or even twenty years does not give you the same legal rights as a married couple. If your relationship ends, or if your partner dies without a will, you could walk away with nothing, even if you’ve paid the mortgage, raised children together, or given up your career to support the household.

That’s where a cohabitation agreement comes in. It’s a legal document that sets out, in plain terms, what happens to your property, savings, debts and belongings if you and your partner separate. It won’t stop a break-up from being painful, but it can stop it from being a legal nightmare on top of an emotional one.

In this guide, we’ll walk through what cohabitation agreements actually cover, why unmarried couples in the UK need one, what the government’s proposed reforms mean for you right now, and how to put one in place without unnecessary cost or stress.

What Is a Cohabitation Agreement?

A cohabitation agreement (sometimes called a “living together agreement”) is a written contract between two people who share a home but aren’t married or in a civil partnership. It records how you’ll handle money and property while you’re together, and, more importantly, how you’ll divide things if the relationship breaks down.

Think of it as a practical roadmap rather than a pessimistic document. Most couples who draw one up never need to refer back to it. But for the small number who do split up, having clear terms already agreed can save months of dispute, thousands of pounds in legal fees, and a lot of unnecessary bitterness.

A typical agreement will address:

• Who owns the home, and in what shares
• How mortgage payments, rent, bills and household costs are split
• What happens to savings, investments and joint accounts
• How debts are treated if the relationship ends
• What happens to belongings bought during the relationship
• Arrangements for pets
• Provisions relating to children, where relevant (though child arrangements themselves are governed separately under family law)

Why Unmarried Couples in the UK Need Legal Protection

Here’s the part that catches most people off guard. Under English and Welsh law, cohabiting couples have almost none of the automatic protections that married couples or civil partners take for granted. There’s no statutory right to:

• A share of your partner’s property if it’s in their sole name
• Spousal maintenance if you separate
• A share of your partner’s pension
• Inherit automatically if your partner dies without a will

Property and money disputes between unmarried couples aren’t handled through family law at all. They fall under trust law and property law, specifically the Trusts of Land and Appointment of Trustees Act 1996 (TOLATA). This is a far less forgiving framework than divorce law, which allows courts to consider fairness, need, and contribution across the whole relationship. Under TOLATA, you generally have to prove a direct financial or beneficial interest in a property to claim any share of it, which can mean years of unpaid childcare or bill-paying counting for very little unless it’s documented.

According to Citizens Advice, the legal differences between living together and marriage are significant and often misunderstood, particularly around property, pensions and inheritance.

The Common Law Marriage Myth

This is worth repeating because the statistics are genuinely alarming. Nearly half of cohabiting couples in the UK still believe that living together for a certain period gives them “common law” spousal rights. It doesn’t, and it never has, anywhere in England, Wales, Scotland or Northern Ireland. No matter how long you’ve shared a home, raised children, or merged your finances, you do not automatically become entitled to a share of your partner’s assets, their pension, or their estate.

This misunderstanding is precisely why cohabitation agreements and wills matter so much. They replace the protection that people wrongly assume already exists.

What Happens Without a Cohabitation Agreement

If you separate without an agreement in place, working out who owns what can turn into a genuinely difficult legal process. A few common scenarios illustrate the risk:

1. One partner owns the home, the other has paid towards it. Without documentation, the non-owning partner may struggle to prove they’re entitled to any share, even after years of contributing to the mortgage or renovations.
2. The home is owned jointly but contributions were unequal. Without an agreement, it may be split 50/50 by default, regardless of who actually paid more.
3. One partner dies without a will. Under the intestacy rules, an unmarried partner has no automatic right to inherit. The estate passes to blood relatives, such as children, parents or siblings, not the surviving partner, no matter how long the couple lived together. You can read the current intestacy rules on GOV.UK for the exact order in which relatives inherit.
4. Joint debts or loans. Without clarity on who’s responsible for what, disputes over shared credit cards, loans or bills can drag on for months.

These aren’t rare, edge-case situations. They’re the everyday reality for unmarried couples who separate or experience a bereavement without having put anything in writing.

What Should Be Included in a Cohabitation Agreement?

A well-drafted cohabitation agreement should be tailored to your circumstances, but most solicitors recommend covering the following areas as a baseline.

1. Property Ownership

This is usually the centrepiece of the agreement. If you own your home together, the document should specify whether you hold it as joint tenants (equal ownership, with the property automatically passing to the survivor) or tenants in common (each person owns a defined, and not necessarily equal, share). For couples who own unequally, a declaration of trust is often used alongside the cohabitation agreement to record the exact percentage split, particularly where one partner put down a larger deposit or has paid more of the mortgage.

2. Financial Contributions and Household Expenses

Set out clearly how rent, mortgage payments, utility bills, council tax, groceries and other shared costs will be split, whether that’s 50/50, proportional to income, or some other arrangement you both agree on.

3. Savings and Investments

Decide whether savings accounts, ISAs, investments or joint accounts will remain separate property or be treated as shared, and what happens to any joint accounts if you separate.

4. Debts and Liabilities

Clarify who’s responsible for existing debts brought into the relationship, and how any debts taken on jointly during the relationship will be divided if you split up.

5. Personal Belongings and Big-Ticket Items

Cars, furniture, and other significant purchases made during the relationship should be addressed, particularly if one partner paid for something that both of you use.

6. Pension and Life Insurance Considerations

While a cohabitation agreement can’t force pension sharing (that’s not how pensions work outside of divorce proceedings), it can record intentions around life insurance, nominations, or other financial planning that protects a surviving partner.

7. Review and Update Clauses

Life changes. A good agreement includes a clause allowing you to revisit and update it, for example, after buying a property together, having children, or receiving an inheritance.

Are Cohabitation Agreements Legally Binding in the UK?

This is one of the most common questions people ask, and the honest answer is: it depends on how the agreement is drafted.

For a cohabitation agreement to stand a strong chance of being upheld by a court, it generally needs to meet the following conditions:

• It must be drawn up as a deed (signed, witnessed and clearly intended to be legally binding)
• Both parties must have received independent legal advice before signing
• There must be full and honest financial disclosure from both sides
• Neither party should have been pressured, rushed, or coerced into signing
• The terms must be fair and reasonable at the time of signing

If these conditions are met, courts have generally been willing to uphold cohabitation agreements, treating them similarly to a contract. If they’re not met, for example, if one partner drafted it alone and the other signed it without any legal advice, a court may decide it’s not enforceable, particularly if enforcing it would produce an unfair outcome.

This is exactly why DIY templates downloaded from the internet carry real risk. They might look official, but if they skip the independent legal advice step or don’t properly reflect both partners’ financial positions, they may not hold up when you actually need them to.

Cohabitation Agreement vs Declaration of Trust vs Will

These three documents often get confused, but they each serve a different purpose, and most family solicitors recommend unmarried couples consider all three together.

A cohabitation agreement without a will still leaves a gaping hole in your protection. If your partner dies intestate (without a will), you have no automatic right to inherit anything from their estate, even if the cohabitation agreement clearly states your shared intentions around property. A will is, in the words of most family lawyers, the single most important document an unmarried couple can put in place.

The Cost of a Cohabitation Agreement

Costs vary depending on complexity and where you’re based, but as a general guide:

• Simple agreements (no property, straightforward finances): roughly £500–£1,000
• Standard agreements (jointly owned property, moderate assets): roughly £800–£1,500 per person, since both partners typically need separate independent legal advice
• Complex agreements (business assets, children from previous relationships, significant wealth disparity): £2,000–£3,000 or more

It’s worth remembering that both partners generally need their own solicitor for the agreement to carry real legal weight. This might feel like an unnecessary expense when you’re setting up a home together, but it’s considerably cheaper than the legal fees, stress and uncertainty of a contested TOLATA claim years down the line.

What’s Changing: The 2026 Cohabitation Law Reform Consultation

If you’ve searched for cohabitation rights UK recently, you’ve probably seen headlines about reform. Here’s what’s actually happening, and what it means for you today.

In June 2026, the Ministry of Justice launched a formal ten-week consultation examining cohabitation rights, financial remedies on divorce, and inheritance rules for bereaved partners at the same time. This joined-up approach follows nearly two decades of campaigning since the Law Commission first proposed reform back in 2007.

The consultation is looking at several possible changes, including:

• Giving bereaved unmarried partners automatic inheritance rights if their partner dies without a will
• Introducing limited financial claims for long-term cohabiting partners who separate, particularly the financially weaker partner or primary caregiver
• Giving courts greater weight to domestic abuse, including economic abuse and coercive control, when deciding financial outcomes
• Making qualifying cohabitation agreements legally binding, provided proper safeguards like disclosure and independent advice are met

Here’s the crucial part: the consultation closed on 14 August 2026, but nothing has actually changed yet. The government still needs to review the responses, decide on a policy direction, and then take any resulting legislation through Parliament. Most family law commentators agree that meaningful reform is unlikely to take effect before 2028 at the earliest.

In the meantime, the law hasn’t moved an inch. If you’re living with a partner today, your legal position is exactly what it was before the consultation launched. A cohabitation agreement, a declaration of trust, and a will remain the only reliable tools available to protect you.

Practical Steps to Protect Yourself as an Unmarried Couple

Whether or not future reform eventually changes the legal landscape, there’s no reason to wait years for protection you can put in place now. Here’s a practical checklist:

1. Make a will. This is the single most urgent step. Without one, your partner could inherit nothing, regardless of how long you’ve been together.
2. Get a cohabitation agreement drafted by a solicitor. DIY templates are cheaper upfront but carry real risk if they’re ever challenged.
3. Sort out property ownership properly. If you’re buying a home together, get a declaration of trust that reflects your actual financial contributions, not just a 50/50 assumption.
4. Check your pension nominations. Contact your pension provider directly to nominate your partner as a beneficiary. This does not happen automatically.
5. Review life insurance. Make sure policies are structured to actually benefit your partner if something happens to you.
6. Keep records of financial contributions. If you’re paying towards a mortgage, renovations, or major purchases, keep evidence. It matters far more than people realise if things ever go wrong.
7. Revisit your arrangements after major life events. Having a child, buying a second property, or receiving an inheritance are all good moments to update your agreement and will.

Do Cohabitation Agreements Cover Children?

It’s important to be clear on this point: cohabitation agreements deal with property and finances between the couple, not arrangements for children. If you separate and have children together, decisions about where they live and how much time they spend with each parent are handled separately under the Children Act 1989, regardless of what your cohabitation agreement says.

That said, unmarried fathers should be aware that parental responsibility isn’t automatic in every case. A father who is named on the birth certificate for a birth registered after 1 December 2003 automatically has parental responsibility. If he isn’t named on the certificate, he may need a formal agreement or a court order to establish it. This is a separate legal issue from the cohabitation agreement itself, but one that often comes up in the same conversation with a family solicitor.

Frequently Asked Questions

Is a cohabitation agreement the same as a prenuptial agreement? No. A prenuptial agreement is for couples who are planning to marry or enter a civil partnership. A cohabitation agreement is for couples who are living together without marrying and have no immediate plans to do so.

Can I write my own cohabitation agreement without a solicitor? You can, but it’s not advisable. For the agreement to have a realistic chance of being upheld, both partners typically need independent legal advice and full financial disclosure. A document drafted without these safeguards is far easier to challenge later.

What if we already own a house together before getting an agreement? It’s not too late. You can still put a cohabitation agreement and declaration of trust in place at any point during the relationship, and doing so now is far better than waiting until a dispute arises.

Do cohabitation agreements expire? No, but they should be reviewed periodically, particularly after major life changes like having children, buying property, or a significant change in income.

Will the 2026 consultation change my cohabitation agreement? Not immediately. Even if the government proceeds with reform, any new legislation is expected to take years to come into force. Existing cohabitation agreements will likely remain relevant, and in some proposals, could become the basis for legally binding “qualifying agreements” under a reformed system.

Conclusion

Cohabitation agreements in the UK remain one of the most important, and most overlooked, legal protections available to unmarried couples. With around 6.5 million people living together without marrying, and nearly half wrongly believing that common law marriage will protect them, the gap between assumption and reality is enormous.

Until the government’s 2026 reform consultation translates into actual legislation, likely years away, the current law offers cohabiting couples very little automatic protection over property, pensions or inheritance. A properly drafted cohabitation agreement, paired with a declaration of trust and an up-to-date will, is the most reliable way to protect yourself, your partner, and your family, whatever the future holds.