Buying with someone else is one of the most common ways first-time buyers afford a home, pooling deposits and incomes to borrow more. But a joint mortgage also ties you together financially. This guide explains buying your first home with a partner, friend or sibling: how it works, the legal side, and how to protect yourself.
Why people buy together
Buying with another person, whether a partner, friend or family member, lets you combine deposits and incomes, which can significantly increase how much you can borrow and afford. Two incomes assessed together usually support a larger mortgage than one, as our guide to what you can borrow explains. For many first-time buyers, buying together is what makes getting onto the ladder possible at all.
How joint borrowing works
On a joint mortgage, the lender considers everyone's income, outgoings and credit history together. The combined income can support a bigger loan, but a poor credit history or high outgoings for any borrower can affect the whole application. So buying together is strongest when everyone's finances are in reasonable shape, since the lender assesses you as a group rather than just adding incomes together.
Joint tenants or tenants in common
In England and Wales, joint owners hold property either as joint tenants or as tenants in common. Joint tenants own the whole property together, and if one dies their share passes automatically to the other. Tenants in common own distinct shares, which can be unequal, and each can leave their share to whoever they choose. Which you choose has important consequences, so it is worth understanding the difference before you buy.
Everyone is jointly responsible
A crucial point is that everyone on a joint mortgage is jointly and severally liable for the whole debt. This means each of you is responsible not just for your share but for the entire mortgage, so if one person cannot pay, the others must cover it. This is why trust and clear agreement matter when buying together, since you are taking on responsibility for each other's share of a large debt.
Unequal contributions
Often people buying together contribute different amounts to the deposit or the payments. If so, holding the property as tenants in common and recording your shares can ensure each person's contribution is recognised, especially if you later sell or split up. Being clear from the start about who is putting in what, and how the property is owned, avoids disputes later and protects everyone's investment fairly.
A declaration of trust
A declaration or deed of trust is a legal document that sets out how much each person owns, how the proceeds will be split on a sale, and what happens in various situations. It is especially worth considering when contributions are unequal or when buying with friends or family rather than a spouse. Putting your understanding in writing protects everyone and prevents costly disagreements if circumstances change.
What if it goes wrong
Relationships and friendships can change, so it is wise to think ahead about what happens if one person wants to sell, cannot pay, or the relationship ends. Options might include one person buying out the other, selling the property, or one taking over the mortgage if they can. Discussing these possibilities and recording your intentions in advance, as our guide to deposits and family help touches on, makes any future change far less painful.
Protecting yourselves
You can protect yourselves in several ways: agreeing terms in writing, choosing the right ownership structure, and considering life insurance so the mortgage could be paid off if one of you died. Being open about finances and expectations from the outset is the best protection of all. Buying together is a big commitment, so the more clearly you set it up, the more secure everyone involved will be.
Buying with parents or family
Some first-time buyers buy jointly with a parent or other relative, combining incomes to borrow more. This can help, but it raises points to consider, including whether the relative already owns a home, which could affect stamp duty and first-time buyer relief. Arrangements like joint borrower sole proprietor mortgages, covered in our guide to family-assist mortgages, can let family help without owning the property.
How a joint mortgage affects your credit
Taking a joint mortgage links you financially with the other person, so their credit behaviour can affect yours and vice versa, for as long as you are tied together. Missed payments would affect everyone on the mortgage. This is another reason to buy with someone you trust and to keep open communication about finances, since your credit records are connected while the joint mortgage lasts.
Stamp duty when buying together
When buying jointly, first-time buyer stamp duty relief usually applies only if everyone is a first-time buyer, as our guide to stamp duty for first-time buyers explains. If one buyer has owned before, the relief is lost. So consider both parties' history before buying together, as it directly affects the stamp duty you will pay on the purchase.
Coming off a joint mortgage later
Circumstances change, and at some point one person may want to leave the mortgage, perhaps if a relationship ends. Removing someone from a joint mortgage usually requires the lender's agreement and proof that the remaining borrower can afford it alone, often through a remortgage. Knowing this in advance helps you plan, and it is one reason to think ahead about what happens if your situation changes.
Talking openly before you buy
The best protection when buying together is an open, honest conversation before you commit, covering contributions, what happens if someone wants out, and how you will handle the unexpected. Recording your agreement, ideally in a declaration of trust, turns good intentions into something clear and enforceable. Buying together works best when everyone understands the commitment and has agreed how to handle the situations that might arise.
The benefits outweigh the risks when planned
For many first-time buyers, the ability to combine incomes and deposits makes joint buying the only realistic route onto the ladder, and with the right planning the benefits clearly outweigh the risks. By choosing the right ownership structure, recording contributions, agreeing what happens if things change, and considering protection like life cover, you can enjoy the advantages of buying together while guarding against the situations that occasionally go wrong.
Take advice on the legal side
Because the legal and financial aspects of joint ownership can be involved, it is worth taking advice from your solicitor on the ownership structure and a declaration of trust, and from a mortgage adviser on the borrowing. Good advice ensures the arrangement reflects what everyone intends and protects each person fairly, which is especially valuable when buying with friends or family rather than a spouse.
In short
Buying with a partner, friend or sibling pools your deposits and incomes, letting you borrow and afford more. But everyone on a joint mortgage is responsible for the whole debt, so trust and clear agreement matter. Choose your ownership structure carefully, record unequal contributions in a declaration of trust, plan for what happens if things change, and consider life cover. Set up well, joint buying is a powerful route onto the ladder.
Where to get help and next steps
Read our guides to how much you can borrow and gifted deposits and family help. This is general information, not legal, mortgage or financial advice.