What is a Cohabitation Agreement & Do I Need One?
Cohabitation continues to rise, but UK law provides limited automatic protection for unmarried couples. The concept of a “common law spouse” is a legal myth; without a formal agreement, cohabiting partners have no automatic rights to property, financial support, or pension sharing if the relationship ends.
A cohabitation agreement bridges that gap, securing your assets and financial independence. In this guide, our specialist family law solicitors break down what to include, how cohabitation agreements protect partners, and whether you need one.
Interested in a particular section? Use the links below to navigate straight to it:
- What is a cohabitation agreement?
- What is a cohabiting partner?
- Do I need a cohabitation agreement?
- How do cohabitation agreements protect partners?
- What can you include in a cohabitation agreement?
- Are cohabitation agreements legally binding?
- How to set up a cohabitation agreement
- Can I update my cohabitation agreement?
- How much does a cohabitation agreement cost?
- The government position: reform under consideration
- When should you get a cohabitation agreement?
- How we can help
Living together or planning to move in with your partner? Reach out to our specialist cohabitation agreement solicitors today for clear, practical advice on protecting your financial future.
What is a cohabitation agreement?
A cohabitation agreement, often referred to as a living together agreement, is a legally binding document that regulates:
- ownership of assets
- financial arrangements during the relationship
- the division of property and finances on separation
At its core, a cohabitation agreement provides certainty. Unmarried couples don’t benefit from automatic legal protections, making a formal agreement essential for defining intentions clearly rather than leaving rights open to interpretation or costly legal disputes later on.
By seeking expert advice from our cohabitation agreement solicitors, both parties can ensure their contributions are accurately documented and protected.
What is a cohabiting partner?
A cohabiting partner is someone who lives with their partner in a relationship, without being married or in a civil partnership.
Crucially, cohabiting partners do not benefit from the rights available to spouses, including:
- automatic rights in property
- claims for financial provision on separation
- pension sharing
- inheritance rights without a valid will
Any claim must instead be established through property and trust law. This is an area that is technical, fact-sensitive, sometimes based on discretion and often contentious.
Do I need a cohabitation agreement?
You likely need a cohabitation agreement if you live with an unmarried partner in the UK and want to protect your financial position.
Unmarried couples in England and Wales do not have automatic legal rights or financial protections if they separate, regardless of how long they live together. The concept of a “common law marriage” is a legal myth with no standing in law. Without a formal agreement, cohabiting partners have no automatic entitlement to property, savings, or ongoing financial support upon separation.
Put simply, if you are not married, hold personal or shared assets, and want to avoid relying on complex and costly trust law if the relationship ends, you need a cohabitation agreement.
How do cohabitation agreements protect partners?
A well-drafted cohabitation agreement provides clarity, certainty, and legal protection for unmarried partners. Rather than relying on verbal promises, it functions as a clear financial contract for your relationship.
Entering into a cohabitation agreement for unmarried partners allows you to:
- Define ownership of property (especially where contributions are unequal)
- Record financial arrangements (mortgage, rent, bills, savings)
- Protect pre-owned assets
- Set out what happens if you separate
- Reduce the risk of litigation
Without a living together agreement, financial disputes between separating partners are determined strictly through property and trust law principles. These legal processes are often lengthier, highly technical and significantly more expensive than a cohabitation agreement.
What can you include in a cohabitation agreement?
A strong agreement addresses both practical day-to-day arrangements and formal legal protections to bring clarity to your living situation. A well-drafted cohabitation agreement for unmarried partners should cover the following key areas:
- Property ownership
- Who owns what, and in what shares
- Financial contributions
- Who will pay the Mortgage payments, rent, and household bills
- Bank accounts and savings
- Joint vs individual arrangements
- Debts and liabilities
- Responsibility for loans or credit
- Children
- While not strictly binding on child arrangements, intentions can be recorded
- Separation provisions
- How assets and finances will be divided
To ensure these terms remain legally enforceable and fully binding, the agreement must be executed properly. Reaching out to our cohabitation agreement solicitors ensures both parties receive independent legal advice and make full financial disclosure.
What is an example of a cohabitation agreement?
An example of a cohabitation agreement typically sets out the practical day-to-day financial arrangements and future legal intentions of living together.
Such an agreement could, for example, record the following provisions:
- Partner A owns the property
- Partner B contributes £X per month towards bills only (but has no beneficial interest in the said property)
- Their joint savings to be split 50/50
- Their personal assets remain individually owned
- In the event of their separation, neither party makes financial claims against the other
This represents a simplified scenario. In practice, cohabitation agreements must be far more detailed and tailored to your specific personal assets, mortgage arrangements and financial liabilities.
Are cohabitation agreements legally binding?
Yes, a cohabitation agreement for unmarried couples is legally binding and enforceable, provided specific legal safeguards are satisfied.
For the courts to treat the agreement as legally binding, the following conditions must be met:
- Full and frank financial disclosure – Both parties must provide an honest, complete overview of their assets, property and liabilities. Hiding financial information can compromise the agreement.
- Independent legal advice for both parties – Each partner must receive independent legal advice from their own solicitor.
- No evidence of pressure or duress – The agreement must explicitly state that both parties intend for the document to be legally binding and enforceable by the court.
- Execution as a formal deed – The document must be drafted correctly, signed in the presence of independent witnesses, and formally executed as a deed.
Courts are increasingly willing to uphold such agreements where these safeguards are met. Our expert cohabitation agreement solicitors ensure every safeguard is satisfied, giving both parties absolute certainty and preventing costly legal disputes down the line.
Can a cohabitation agreement be overturned?
While a properly executed deed is binding, a court can overturn or set aside an agreement if key legal safeguards were broken (such as hidden assets, coercion, or lack of independent legal advice).
Additionally, an agreement may be challenged if there has been a fundamental, unforeseen change in circumstances, such as the birth of a child, that makes upholding the original terms manifestly unfair.
How to set up a cohabitation agreement
Knowing how to set up a cohabitation agreement properly ensures that it holds up in court should you ever need it. The setup process typically follows four key steps:
- Open discussion: Both partners discuss their expectations regarding property, savings, debts, and bill contributions.
- Financial disclosure: Both parties compile a comprehensive list of their individual and shared assets, income, and liabilities.
- Professional drafting: A specialist solicitor drafts the agreement to ensure the clauses are robust, legally sound, and reflect your intentions.
- Independent advice & execution: Each partner receives independent legal advice to ensure they understand the terms. Once finalised, both sign the document as a formal deed in the presence of witnesses.
Can you write your own cohabitation agreement?
Technically, you can write your own cohabitation agreement using a template or informal document. However, DIY agreements carry substantial legal risks. Without professional legal drafting and verified independent legal advice, a homemade agreement is far more vulnerable to being overturned or declared unenforceable by a court. Crucial safeguards, such as formal disclosure requirements and deed execution, are frequently missed in self-written documents, leaving your assets exposed.
Can I update my cohabitation agreement?
Yes, you can update your cohabitation agreement, and in fact, it is strongly recommended that you review it regularly. Life changes over time, and an outdated agreement may no longer protect your financial position or reflect your current setup.
You should update your agreement whenever significant life events occur, such as:
- Buying a new home or remortgaging
- Having children
- Receiving a substantial inheritance or financial windfall
- A significant change in either partner’s income
To update the agreement effectively, any amendments must be agreed upon by both partners, documented in writing (often via a formal variation or a new deed), and processed with independent legal advice to maintain legal enforceability.
How much does a cohabitation agreement cost?
The cost of a cohabitation agreement will depend on the complexity of the arrangements, but typically falls within:
- £750 – £2,500 + VAT for a standard agreement
- More where there are multiple properties, businesses, or complex financial arrangements
While this may seem like an upfront expense, it is minimal compared to the potential expense of resolving a dispute following a separation. Without a formal agreement in place, financial claims between unmarried partners can easily lead to court litigation costing tens of thousands of pounds.
The government position: reform under consideration
There is increasing political and legal focus on whether the current position remains fit for purpose. The UK Government has confirmed that a formal consultation on cohabitation law reform is expected in 2026, examining whether greater legal protection should be introduced for cohabiting couples. This builds on earlier recommendations from the Law Commission, which have long highlighted the gaps in the existing framework.
However, no changes to the law are currently in force. The consultation stage is exactly that—consultation. The scope, structure, and timing of any reform remain uncertain, and any legislative change is likely to be some way off.
In practical terms, the current legal position continues to apply. Anticipated reform is not a substitute for putting proper legal protection in place now.
When should you get a cohabitation agreement?
Timing is critical when securing your financial position. You should consider putting a cohabitation agreement in place at key milestones in your relationship, such as:
- Before moving in together
- When purchasing property jointly
- When one party is contributing significantly more financially
- When one partner owns the home
- Family or inherited funds are involved
- There are children
It is never “too early” to put a cohabitation agreement in place —only too late once a dispute over financial assets arises. Seeking advice from our cohabitation agreement solicitors ensures both parties enter the agreement with full clarity and independent legal advice.
How we can help
A cohabitation agreement is not about anticipating the end of a relationship. It is about defining expectations and protecting positions while the relationship is stable.
Without a living-together arrangement, the outcome of any future dispute over property, savings, or assets is uncertain. Financial claims between unmarried partners are determined strictly through complex and expensive trust and property law principles, an uncertain route often driven by technical legal arguments rather than clear intention.
With a professionally drafted cohabitation agreement in place, your financial position is controlled, documented, and far more likely to be upheld. Instructing our expert cohabitation agreement solicitors ensures both parties fulfil all mandatory legal safeguards, including full financial disclosure and independent legal advice, giving you absolute clarity and peace of mind.
Contact us today about making a cohabitation agreement; our specialist team would be delighted to walk you through the process, ensuring greater clarity, control, and long-term protection for your assets.
