Buying With a Sibling or Friend: Funding the Buy-Out

Buying a house with a friend or a sibling, and wondering what happens if one of you dies? The answer turns almost entirely on two words on your title: whether you own as joint tenants or as tenants in common. Get that wrong and the survivor can find themselves co-owning their own home with the dead co-owner's family, or forced to sell the house they live in. Get it right, and plan for the money, and the survivor can keep the home.

Here is the uncomfortable version most people have not thought through. If you buy as tenants in common, which is usually the sensible way for friends or siblings to buy because it records who put in what, then when one of you dies that person's share does not pass to the survivor. It passes under their will, or if they have no will, under the intestacy rules, to their relatives. The survivor is left owning half a house alongside their late friend's parents or siblings, who may want their share turned into cash.

So the real question is not only who inherits, but whether the survivor could afford to buy the other half from the people who inherit it. That is the gap this page is about, and it has a specific, well-established solution.

The short answer: it depends how you hold the title

Two people can own a property together in one of two legal ways, and they produce opposite results on death.

As joint tenants, you own the whole of the property together, with no distinct shares, and the right of survivorship applies. When one owner dies, their interest passes automatically to the survivor, outside the will and without waiting for probate. This is how most married couples own, precisely because they want the survivor to take everything.

As tenants in common, each of you owns a distinct share, which can be equal or unequal, and there is no right of survivorship. When one owner dies, their share passes under their will, or if there is no will, under the intestacy rules. It does not pass to the co-owner. For two friends or two siblings who contributed different deposits, tenants in common is usually the correct choice, because it protects each person's actual stake, but it is also the choice that leaves the survivor exposed if nobody plans for the death.

If you are not certain which you are, do not guess. The way to settle it is to read your title, and we set out exactly where to look, and the inexpensive document from the land register that tells you, in how to check whether you are joint tenants or tenants in common.

Who actually inherits your friend's or sibling's half

Assume you own as tenants in common, which is the common case. When your co-owner dies, their share is dealt with by their estate. If they left a will, it goes to whoever they named. If they did not, the intestacy rules decide, and those rules follow blood and marriage, never friendship. A sibling co-owner's share might pass to their spouse, or to their children, or up to your co-owner's parents. A friend's share could go to a partner or a parent you have never met. The one person it will not automatically go to is you.

The intestacy rules are worth understanding here because they are rigid and they surprise people, particularly where the co-owners were an unmarried couple rather than friends. We trace exactly where an unmarried person's share travels, step by step, in where your half goes when you buy together before marriage. The mechanism is identical for friends and siblings: the share leaves your household and lands with the deceased's relatives.

Then comes the part people do not expect. Once a relative inherits a share as a tenant in common, they are a co-owner alongside you, with the rights of a co-owner. In England and Wales, any co-owner can apply to the court under the Trusts of Land and Appointment of Trustees Act 1996 for an order that the property be sold. So an inheriting family member who wants their money, rather than a stake in a house they will never live in, can ask a court to force a sale. The survivor's choice narrows to two: raise the money to buy them out, or lose the home. This is the same dynamic that plays out when a co-owner is not on the mortgage or the deeds at all, which we cover in a mortgage in one name with two people living in the house and in what happens when you are not on the deeds.

Why a declaration of trust matters

A declaration of trust, sometimes called a deed of trust, is a written agreement between co-owners that records the things the title register does not. Who contributed what to the deposit. How the sale proceeds are divided. Who pays what share of the mortgage and the bills. And, most relevant here, what happens if one owner dies or wants to leave.

It is not legally compulsory, but buying a substantial asset with someone without one is a genuine risk. Years later, an unequal deposit is hard to prove from memory, and a dispute with a deceased co-owner's grieving family is exactly the situation where a clear, signed document is worth its weight. A well-drafted declaration of trust can, for example, give a surviving owner a defined right or period to buy the other share at a fair valuation before any sale to an outsider, which turns a chaotic outcome into an orderly one.

What a declaration of trust cannot do on its own is produce the money. It can give the survivor the right to buy the share; it cannot make the buying affordable. That is the job of cover.

Funding the buy-out: the cover that makes it possible

The clean solution to this whole problem is for each co-owner to hold life cover on the other, sized to the value of that person's share, so that if one dies the survivor receives a sum that lets them buy the deceased's share from the estate. It is the same idea businesses use to keep a firm in the surviving owners' hands, which is why it is worth reading alongside how a share in a business is turned into cash for a family: cover converts an illiquid half-a-house into money the survivor can actually use, and gives the deceased's family a clean cash inheritance rather than a stake in a stranger's home.

The shape of cover matters. A repayment mortgage falls over time, but the value of an owner's equity share does not; if anything it tends to grow as the loan reduces and prices rise. That is why a decreasing policy, designed to track a shrinking mortgage, is the wrong tool for a buy-out, and level term cover, which keeps the sum assured constant for the term, usually fits far better. Some owners revisit the amount periodically so it keeps pace with the property's value.

How much the share might cost to buy is not a fixed number, because house prices move. The standard published measure of that movement is the official house price index, so if you want to sense-check whether your cover still matches your share, that is the reference to use rather than a guess.

Source: HM Land Registry, UK House Price Index, published under the Open Government Licence v3.0.

If you are setting this up, an FCA-authorised broker can arrange cover on each co-owner's life for the other's benefit, held so it pays the right person at the right time. You can get life insurance quotes to price it against your actual share and the property's value. We do not state what cover costs, and no policy can promise acceptance or a payout, because that depends on underwriting.

If there is still a mortgage on the property

A buy-out is only half the money question if a mortgage remains, because the mortgage sits on top of the ownership issue rather than replacing it. Where the mortgage is a joint one, both borrowers are jointly and severally liable for the whole balance, so on a death the survivor owes the entire mortgage as well as facing the buy-out of the deceased's equity. Where the mortgage was in one owner's sole name, the borrowing and the ownership can point in different directions, which creates its own tangle.

The practical order of events is worth thinking through in advance. The survivor may need money to clear or take over the mortgage and separate money to buy the deceased's share of the equity from their family. Cover can be sized to both, but only if both were considered when it was arranged. A common mistake is to insure the mortgage and forget the equity, leaving the survivor able to keep paying the loan but unable to stop the co-owner's family from forcing a sale.

Scotland and Northern Ireland

The underlying question is the same everywhere in the UK, but the legal terms and the court routes differ, so do not carry an England-and-Wales answer north or west without checking.

In Scotland, the concepts of joint tenants and tenants in common do not exist by those names. Co-owners hold the property in common in shares, and a title can include a survivorship destination, a clause that passes a deceased owner's share to the survivor automatically, which functions a little like a joint tenancy but is written into the deed itself. Where there is no survivorship destination, the deceased's share passes under their will or under Scottish succession law. The Scottish equivalent of forcing a sale is an action of division and sale, rather than an application under the 1996 Act. In Northern Ireland, joint tenancy and tenancy in common broadly exist as they do in England and Wales, but land there is registered through its own system, so check your own title. Wherever you are, the safe move is the same: confirm how you hold the property, record your intentions in a declaration of trust, and make sure there is money to make those intentions possible. The rest of this topic sits in our hub on life events that change who depends on you.

Frequently asked questions

What happens to our house if my friend and I own it together and one of us dies?

It depends how you hold the title. As joint tenants, the whole property passes automatically to the survivor. As tenants in common, the deceased's share goes under their will or the intestacy rules, so their relatives can inherit a stake in the home you live in. Friends and siblings most often buy as tenants in common, which means the survivor does not automatically get the other half.

Can my friend's family make me sell the house?

If they inherit a share as tenants in common they become co-owners, and in England and Wales they can ask the court to order a sale under the Trusts of Land and Appointment of Trustees Act 1996. Scotland has a similar route through an action of division and sale. A written agreement setting out what happens on a death, and money available to buy them out, are what usually prevent a forced sale.

Do we need a declaration of trust if we buy together as friends?

It is not compulsory, but it records who put in what, how the proceeds are split, and what happens if one of you dies or wants out. Without it, unequal deposits are hard to prove years later, and disputes with a deceased co-owner's family become expensive and slow. It works best paired with cover that provides the money to act on the rights it gives you.