Co-Buying a Home: 61 Million Americans Already Do It

Overview

Buying a home with people you are not married to has stopped being unusual. Roughly 30% of US home sales now involve co-buyers, up from 25%, and around 61 million Americans co-own property with someone who is not their spouse.

The composition has shifted too. Friends now feature in 58% of co-owner groups, up from 49% in 2021, making them a larger category than relatives at 30% or unmarried couples at 23%. Average group size rose to 3.6 people in 2025.

The part that receives far less coverage is where these arrangements break down. Among groups of six or more, 95% never complete a purchase together — blocked by the difficulty of building consensus and by mortgage financing that is not designed for them.

Legal protection is the other persistent gap. The share of co-owners saying they need help with risk protection rose from 56% to 59% in a year, which describes a large number of people who have already bought property together without the agreements that govern what happens when something goes wrong.

30% of Home Sales Involve Co-Buyers

The scale here is considerably larger than the trend-piece framing suggests. Co-buying accounts for around 30% of US home sales, having risen from 25%, and the number of Americans co-owning with someone they are not married to has grown from 50 million to 61 million.

Sixty-one million people is not a subculture. It is a substantial share of American homeowners, and it includes arrangements that look nothing like the friend-group compound that dominates coverage — adult children buying with parents, siblings pooling an inheritance, unmarried partners, and business-like arrangements between relatives.

The growth from 25% to 30% of sales is the meaningful movement. In a market where affordability has deteriorated sharply, a five-percentage-point shift in how purchases are structured represents a large number of households solving the same problem the same way.

Friends Overtook Family

The most genuinely novel finding is who people are buying with. Friends now appear in 58% of co-owner groups, up from 49% in 2021, ahead of relatives at 30% and unmarried couples at 23%.

Buying property with relatives has always happened — inheritance, family businesses, multigenerational households. Buying with friends is different in kind, because it lacks the durable obligations family relationships carry and the legal frameworks that surround marriage.

That distinction matters most when something goes wrong. Family disputes over property are painful and there are established norms and legal structures for resolving them. Friendships have neither, which is why the legal groundwork matters more in exactly the arrangements least likely to have it.

Groups Are Getting Bigger

Average co-owner group size rose to 3.6 people in 2025, up from 3.3 the year before. A shift of 0.3 in an average of this kind reflects a meaningful move toward larger groups.

The logic is straightforward arithmetic. If two incomes are insufficient for the property people want in the area they want it, three or four incomes extend reach further. Each additional participant increases borrowing capacity and reduces the individual deposit required.

What scales less well is everything else. Every additional person adds a set of preferences about location and property, a personal financial situation that may change, a credit profile the lender must assess, and a potential future desire to exit. The financial benefit of another participant is linear; the coordination cost is not.

95% of Six-Person Groups Never Close

The single most useful statistic for anyone considering this route is the failure rate at larger group sizes: 95% of groups with six or more members do not complete a home purchase together.

That is not a modest attrition rate. Nineteen out of twenty large groups that set out to buy property together do not end up owning anything, after what is presumably a considerable investment of time, hope and in some cases money.

Two hurdles are identified. Building consensus across that many stakeholders is difficult, and securing traditional residential mortgage financing for a group that size is harder still. Both worsen as the group grows, which is why the average successful group sits at 3.6 people rather than six or eight.

Why Mortgages Break at Scale

Residential mortgage lending is built around a small number of borrowers, and the assumption is embedded deeply in how underwriting works.

A lender assessing a joint application must evaluate every applicant's income, credit history, existing debts and employment stability, and the resulting risk assessment tends to be driven by the weakest profile rather than the average. Adding a fourth or fifth borrower adds another opportunity for something in the file to cause a decline.

Beyond a certain size, applications stop resembling residential lending and start resembling commercial arrangements, which carry different terms, higher rates and larger deposit requirements. Groups that structure ownership through a company to simplify the legal position frequently discover they have moved themselves out of residential mortgage products altogether.

Consensus Is the Other Wall

Financing is the visible obstacle; agreement is the one that quietly ends most attempts.

A group of six has to converge on a location, a property type, a price ceiling, a timeline and a shared view of acceptable compromise — before anyone has committed money. Any individual can effectively veto by hesitating, and in a competitive market the delay required to reach agreement is often enough to lose the property.

This is why the successful average sits near three or four. It is large enough to materially improve purchasing power and small enough that decisions can actually be made. The optimum is set by coordination capacity rather than by finance.

59% Say They Need Risk Protection Help

The share of co-owners reporting they need help with risk protection rose from 56% to 59% year on year — a majority, and rising.

Read carefully, that is a statement about people who already own property together and do not have adequate arrangements in place for the things that can go wrong. They are not prospective buyers researching options; they are current co-owners identifying a gap after the fact.

The rise alongside growing participation suggests the practical infrastructure has not kept pace with the trend. More people are entering these arrangements than are getting them properly documented, which stores up disputes that will surface years later when circumstances change.

What a Co-Ownership Agreement Has to Cover

The questions that need answering in advance are the ones nobody wants to raise while everyone is excited about a property.

Why the Driver Is Affordability, Not Ideology

Co-buying is frequently presented as a cultural choice — a rejection of isolated living in favour of intentional community. The evidence points more plainly at prices.

People are pooling incomes because individual incomes no longer reach the housing they want, in the places they want it. Group size is rising as affordability worsens, which is a straightforward economic response rather than a values shift. Communal benefits are real and mostly a welcome consequence.

The distinction matters for how the trend should be read. If this were primarily cultural, it would persist regardless of prices. If it is primarily financial, it will continue as long as housing costs outpace incomes, and the number of people entering complex shared arrangements without adequate legal protection will keep growing with it.

Which is the practical warning underneath the data. Co-buying can work well and demonstrably does for millions of people. It works best in small groups, with mortgage products that fit, and with the uncomfortable conversations completed before contracts are signed rather than after.

Conclusion

Co-buying is far more established than its coverage implies. It accounts for around 30% of US home sales, 61 million Americans co-own with someone they are not married to, and friends now appear in 58% of co-owner groups — a larger share than relatives.

The constraint is group size. Average successful groups sit at 3.6 people, and 95% of groups with six or more never complete a purchase at all, defeated by consensus-building and by mortgage underwriting built for one or two borrowers.

The gap most likely to cause harm is legal rather than financial. Fifty-nine percent of existing co-owners say they need help with risk protection, which describes people who already own property together without settled arrangements for exit, death, default or deadlock — the four events that turn a shared asset into a dispute.

This article summarises published survey and market data for general information. It is not financial, legal or property advice. Anyone considering co-ownership should obtain independent legal and financial advice before committing.

Data Source and Attribution

CoBuy 2025 ReportNational Association of RealtorsCNBC

Co-buying prevalence, co-owner group composition, average group sizes, large-group completion rates and risk protection figures come from a 2025 survey of 1,637 home co-owners, together with associated market reporting. Context on first-time buyer assistance comes from the National Association of Realtors' 2025 profile of home buyers and sellers. Survey-based figures reflect self-reported data from participating co-owners rather than transaction records.

FactsFigs reviews, cleans, and cross-checks every source dataset before shaping it into a data story. Each visualization is created and designed in FactsFigs Design Studio — an internal tool developed and owned by FactsFigs — and is the original work of a FactsFigs author, not an AI-generated copy of any existing graphic. Individual assets within a visual may or may not be produced with AI tools, but the design of the visual itself is solely FactsFigs' own.

This content is for information only and is not financial, legal or property advice. Property co-ownership carries significant legal and financial risk.

2026-07-20