What Every Co-Buyer Should Know
More people are buying homes with someone other than a spouse than at almost any point in recent memory. StreetEasy’s 2025 Buyer Trends Survey found that 56% of prospective NYC buyers planned to purchase with a co-buyer, and 9% of them planned to buy with a friend and 6% with a relative rather than a partner. That “third way” of ownership is exactly what Pairgap is built for.
But co-buying comes with a question most people don’t ask until it’s too late: what happens if one person wants out and the others don’t? The answer is that yes, in nearly every state, a co-owner can go to court and force the sale of the property. It’s called a partition action, and understanding how it works – before you buy, not after a disagreement – is one of the most practical things a co-buyer can do.
The Short Answer: Yes, Through a Partition Action
A partition action is a lawsuit one co-owner can file to end shared ownership of a property, either by dividing it physically or, far more commonly for a single-family home, by forcing a sale and splitting the proceeds. Courts generally don’t require the filing owner to prove hardship or fault. Wanting out is enough.
That surprises a lot of first-time co-buyers. Many assume that because everyone signed the mortgage together, everyone also has to agree before anything changes. That’s not how ownership law works. As a general rule, no one can be legally compelled to remain a co-owner of real property against their will indefinitely.
What a Partition Action Actually Looks Like
The process is slower and more procedural than most people expect. It generally follows this sequence:
- Informal negotiation. Before anyone files anything, the co-owner who wants out usually raises the idea of a sale or buyout directly.
- Filing the lawsuit. If negotiation stalls, the co-owner who wants to sell files a partition action in civil court.
- Notice to all owners. Every co-owner with a legal interest in the property has to be notified and given the chance to respond.
- Valuation. The court typically orders an appraisal to establish fair market value, especially where a buyout is possible.
- Buyout opportunity. In many states, the co-owners who want to keep the property get the first chance to buy out the one who wants to sell, at the appraised value.
- Sale, if needed. If no one can afford a buyout, the court orders the property sold – sometimes on the open market, sometimes at auction – and splits the proceeds according to each owner’s share.
Timelines vary widely by state and by how contested the case is, but a partition action commonly takes several months to well over a year to resolve, and it isn’t cheap: court costs, appraisal fees, and attorney fees typically come out of the sale proceeds before anyone gets paid.
Tenants in Common vs. Joint Tenancy: Why It Matters Here
How you and your co-buyers hold title affects how a partition plays out.
| Tenants in Common | Joint Tenancy | |
|---|---|---|
| Ownership shares | Can be unequal (e.g., 60/40) | Always equal |
| What happens if an owner dies | Their share passes to their heirs, not the other owners | Their share passes automatically to the surviving owners |
| Common use case | Friends, siblings, unequal down payments | Married couples, equal partners |
| Subject to partition | Yes | Yes |
Unequal contributions are common in real co-buying situations – one person makes a bigger down payment, one covers more of the monthly costs – which is exactly why tenancy in common, paired with a written agreement spelling out ownership percentages, tends to fit real co-buyer arrangements better than a generic joint tenancy deed.
When Family Property Gets Extra Protection
If you’re buying with siblings, or you’ve inherited a share of a family property, there’s an important legal development worth knowing about. Historically, partition actions were sometimes used to strip families of inherited “heirs’ property” – an investor could buy a small fractional interest from one relative, then force a sale of the entire property at a below-market price.
To address this, the Uniform Law Commission drafted the Uniform Partition of Heirs Property Act (UPHPA), a model law that gives co-owners of inherited property more due process before a forced sale: notice requirements, a court-ordered appraisal, and a right of first refusal for the other co-owners to buy out the person seeking a sale. As of early 2026, roughly half the country – 26 states, with several more considering it – has adopted some version of the UPHPA.
If your co-buying situation involves inherited property or family members, it’s worth finding out whether your state has adopted this protection, since it directly affects how a future disagreement would play out.
What Co-Buyers Commonly Get Wrong About This
- “We’re all reasonable people, we won’t need an agreement.” Most disputes don’t start as disputes – they start as one person’s life changing (a job move, a marriage, a financial setback) while the others’ plans stay the same.
- “Whoever put down more money automatically controls the decision.” Ownership percentage affects the split of proceeds, not who gets to unilaterally decide whether to sell.
- “A partition action means we lose the house immediately.” It’s a process, not a switch. There’s usually a real window to negotiate a buyout before a forced sale happens.
- “This only happens with inherited property.” Partition actions apply to any co-owned property — friends, unmarried partners, and investors included, not just family who inherited a home together.
What This Means for Co-Buyers
The existence of the partition process doesn’t mean co-buying is risky in a way that should scare people off. It means the exit terms are the part of the deal that most needs to be decided in advance, not worked out under pressure later. Specifically, before you close, you and your co-buyers should agree in writing on:
- What triggers an exit (someone wants out, someone stops paying, someone dies)
- Whether the remaining owners get a right of first refusal to buy out the exiting owner, and how that price gets set
- A timeline for that buyout, so it isn’t open-ended
- How disagreements get resolved before anyone goes to court (mediation is far cheaper than litigation)
None of this eliminates the legal right to a partition action – that right exists under state law regardless of what you sign. But a clear agreement gives everyone a faster, cheaper, less adversarial off-ramp than a courthouse, and it’s the difference between an “exit” and a “crisis.”
Where Pairgap Fits In
This is the exact gap Pairgap’s real estate prenup was built to close. Instead of leaving exit terms, buyout pricing, and dispute resolution to be improvised after a disagreement has already started, a real estate prenup puts those decisions in writing before you buy – while everyone’s still getting along and thinking clearly. It’s not a substitute for an attorney, but it gives you and your co-buyers a structured starting point covering ownership percentages, buyout terms, and what happens if someone needs to exit, so a disagreement down the line has a process to follow instead of a lawsuit to file.
Frequently Asked Questions
Can a co-owner with a small ownership share still force a sale?
In most states, yes. Partition rights generally aren’t limited to majority owners – any co-owner can typically petition the court, regardless of what percentage they hold.
Can co-buyers avoid partition actions entirely with a written agreement?
You can’t sign away the legal right to petition for partition in most states, but a well-drafted co-ownership agreement can make it far less likely anyone needs to. If it clearly defines buyout terms and timelines, most disagreements get resolved through the agreement rather than the courts.
Do unmarried co-buyers have the same partition rights as married couples?
Yes. Partition rights are based on how title is held (tenants in common or joint tenancy), not on marital status. Unmarried friends, siblings, or partners have the same underlying rights as spouses.
What happens if one co-owner stops paying their share of the mortgage?
This is usually addressed separately from partition, often through the co-ownership agreement’s terms for reimbursement or forced buyout, but it can also become grounds for one owner to pursue a partition action if the situation doesn’t get resolved.
Is a partition action the same as a foreclosure?
No. A foreclosure is initiated by a lender over unpaid debt. A partition action is a dispute between co-owners over the property itself and can happen even if the mortgage is fully current.
How long does a partition action typically take?
It varies significantly by state and by how much the parties contest it, but several months to over a year is common, especially when appraisals, buyout negotiations, or heirs’ property protections are involved.
Take the Next Step
If you’re planning to buy with a friend, sibling, or partner, don’t wait until there’s a disagreement to figure out how you’d handle one. Explore the Pairgap real estate prenup to put your exit terms, ownership percentages, and buyout process in writing before you close – but first start your Pairgap profile and take the Real Estate Partner Test to check compatibility with your co-buyer.
