Buying a Home Unmarried: Why a Cohabitation Agreement Deserves a Place at the Table

Buying a home together is often described as a commitment. For unmarried couples in England and Wales, it is also a financial and legal arrangement that the law will examine closely if things go wrong. The difficulty is that many couples never have the awkward conversation until it is too late.

A cohabitation agreement is not a sign that a relationship is doomed. It is a practical document that records what you have both agreed about money, property and responsibilities while you are on good terms. This article explains why it matters and how to approach the conversation without making it feel like an accusation.

The law does not treat all couples the same

There is no such thing as a “common law spouse” in England and Wales. However long you have lived together, and however shared your lives may feel, an unmarried partner does not automatically acquire the same property or financial rights as a spouse or civil partner.

If you buy a home together, the starting point is who is named on the legal title and on the mortgage. Where you own as joint tenants, you usually hold the property equally and the right of survivorship applies. Where you own as tenants in common, you can own in defined shares. Problems often arise when one person pays the deposit, one pays most of the mortgage, or one pays for a major renovation, but the legal documents do not record what was intended.

A cohabitation agreement can sit alongside the transfer deed and any declaration of trust. It can help show what you both intended, which is far easier than trying to reconstruct the plan years later through a court dispute.

What the agreement can cover

A well-drafted agreement can deal with ownership shares and how they are calculated. It can record that one person’s deposit will be returned first on sale, or that contributions to the mortgage, bills or improvements will be treated in a particular way.

It can also set out what happens if you separate or one of you dies. That might include a buy-out mechanism, a valuation process, a notice period before sale, or who is responsible for mortgage payments and insurance in the meantime.

Other practical points include household bills, repairs, debts, guarantees and what should happen if one person moves out. Some couples include intentions about pets or future children, although the agreement cannot replace a court’s decision on child arrangements if a dispute later arises.

The agreement does not deal with wills, pensions or life insurance. Those need separate documents. If you want your partner to inherit from you, relying on the intestacy rules is risky for unmarried couples.

Why it is not a distrust document

The conversation often goes wrong because it is framed as “what happens if we break up?” A better framing is “how do we protect both of us while we build something together?” A cohabitation agreement is closer to a business plan or home insurance than a verdict on the relationship.

It is also a protection against unequal assumptions. One person may believe the deposit will be repaid first; the other may assume all contributions are equal. Writing it down exposes those assumptions before they become arguments.

Both of you should take independent legal advice. Full financial disclosure matters. An agreement signed under pressure, without advice, or based on incomplete information is more likely to be challenged. Review the document when circumstances change — a new mortgage, a renovation, a child, a change in income or one person moving out.

A checklist to settle early

• Decide whether you will own as joint tenants or tenants in common.
• Record the deposit and any family gift clearly, including whether it is a loan or a gift.
• Agree the ownership shares and put them in a declaration of trust if needed.
• Check how the mortgage liability is shared and what happens if one person stops paying.
• Agree how bills, repairs, insurance and improvements will be funded.
• Decide what happens on separation: buy-out, sale, valuation and notice.
• Make wills and consider life insurance if either of you relies on the other.
• Keep signed copies and records of the legal advice each of you received.
• Diarise a review every year or after any major life event.

How to start the conversation

Choose a calm moment, not the day you exchange contracts. Use “we” language: “Before we take on a mortgage, I want us both to be clear about what we are each putting in and what happens if things change.” Avoid blaming or implying that one person is planning an exit.

If the conversation feels difficult, a mediator or a solicitor can help you talk through the options. That can be less adversarial than waiting for a dispute to force the issue.

A cohabitation agreement will not solve every problem, and it is not a substitute for tailored legal advice. It can, however, turn vague expectations into a clear record. For unmarried couples buying a home, that is often the most valuable document after the mortgage itself.