Can My Ex Force Me to Sell Our House in New York? What Unmarried Co-Owners on Long Island Need to Know About Partition (2026)

Can my ex force me to sell our house in New York?

Yes, if your ex is on the deed. Under RPAPL 901, any co-owner of New York real property may bring a partition action asking the court to divide the property or, when a physical division would cause great prejudice, sell it and split the proceeds. A house on a Long Island lot cannot be cut in half, so partition almost always means a sale unless the co-owners settle first. Your ex does not need your consent and does not need a reason beyond wanting out.

In my practice in Nassau County I see this more every year, because more couples buy homes together before marriage and more of them separate without ever having signed a thing. The hard truth is that the house is not a relationship question in the eyes of the court. It is a title question. The deed says who owns it and in what shares, and the accounting says who paid what. Everything else, who proposed, who put their career on hold, who did the renovations on weekends, matters only to the extent it shows up as money spent on the property.

The good news is that a filed partition action is rarely the way these cases actually end. Once both sides understand that a forced referee sale is the outcome if nobody blinks, and that a referee sale usually nets less than a market sale, most couples settle on a buyout or an agreed listing within months. The lawsuit is the leverage that produces the settlement, not the destination.

What happens to a house when an unmarried couple breaks up in New York?

When an unmarried couple in New York breaks up, the house is divided according to the deed and property law, not according to fairness or the length of the relationship. New York's equitable distribution rules under Domestic Relations Law 236 apply only to spouses, and New York does not recognize common law marriage created within the state. An unmarried co-owner's remedy is a partition action, an agreed sale, or a buyout.

First, the deed does the work. Under EPTL 6-2.2, a deed to two or more people creates a tenancy in common unless it expressly says joint tenancy, and a deed that does not state percentages is treated as equal shares. Tenants in common each own an undivided share they can sell, mortgage, or leave in a will. Joint tenants with right of survivorship each own the whole, and when one dies the other takes everything, which is a serious problem for an ex who never got around to fixing the deed after a breakup. One wrinkle: EPTL 6-2.2(d) says that a deed to two people who are not legally married but who are described in the deed as husband and wife or as spouses creates a joint tenancy, so the words on the deed matter even when the marriage never happened.

I have sat across from people who put ten years and every spare dollar into a house and walked away with far less than half because the deed said 30 percent, or because the deed did not have their name at all. I have also seen a partner who paid almost nothing walk away with half because the deed said equal shares and there was no written agreement saying otherwise. If you are buying with a partner and not married, the time to fix this is at the closing table, with a co-ownership agreement that spells out shares, contributions, and what happens on a breakup. After the breakup, you are working with whatever the paperwork already says.

What if my name is not on the deed but I paid toward the house?

If your name is not on the deed, you are not a legal owner and you cannot bring a partition action. A verbal promise that the house was half yours is generally unenforceable, because General Obligations Law 5-703 requires agreements creating an interest in real property to be in writing. Your realistic paths are proving a written agreement, proving a constructive trust, or negotiating a payout in exchange for a release.

A constructive trust, in plain terms: New York courts can impose one where there was a confidential relationship, a promise, a transfer or contribution made in reliance on that promise, and unjust enrichment if the other person keeps the whole benefit. A long-term partner who paid half the mortgage for years on the strength of "this is our house" may have a claim, but it is a fact-intensive lawsuit, the burden is on the person off the deed, and the outcome depends heavily on documents, texts, and bank records. Contributions to ordinary living expenses, groceries, and utilities usually do not count; the court is looking for money that went into acquiring, paying down, or improving the property.

The hard truth is that the person on the deed holds every card at the start. They can sell, refinance, or borrow against the house without the other's signature. If you are the one off the deed, do not wait and hope. Gather your proof of payments now, put your claim in writing through counsel, and understand that a negotiated settlement is almost always cheaper and faster than litigating a constructive trust to judgment.

Who gets credit for the down payment, mortgage payments, taxes, and repairs?

In a New York partition, the court does not simply split the sale price by ownership share. It conducts an accounting and adjusts each co-owner's share for what they paid beyond their proportion toward the down payment, mortgage principal and interest, property taxes, insurance, and necessary repairs, and it can charge a co-owner for rents collected. RPAPL 945 lets the court adjust the parties' rights where one received more than their proper share of rents or profits, and the broader equitable accounting of contributions comes from decades of New York case law.

In practice, credits are proven with closing statements, bank records, mortgage histories, tax bills, and receipts, and the co-owner claiming a credit has to prove it. Improvements are usually credited by the amount they increased the value of the property, not by what they cost, so a $60,000 kitchen that added $25,000 of value earns a $25,000 credit, if that. Then the occupancy question: under long-standing New York case law, a co-owner who lives in the house alone is generally not charged rent to the other co-owner unless the other was actually excluded, what the cases call an ouster. Courts do, however, often weigh the occupying owner's exclusive use against the carrying-cost credits they claim, so the co-owner who stayed and paid the mortgage should not assume every dollar comes back.

Keep every record. The single most common reason a co-owner loses credit they deserve is that they paid from a joint account and cannot show whose money it was, or paid cash for repairs with no receipts. Start a folder today.

Can my ex make me move out, or can I make my ex move out?

No. Two co-owners on the deed have an equal right to possess the entire property, so neither can change the locks, remove the other's belongings, shut off utilities, or use a landlord-tenant eviction against the other. A co-owner is not a tenant. The way to get exclusive possession is a signed agreement, a buyout, or the sale itself.

Self-help lockouts expose the locking co-owner to liability and can support an ouster finding that shifts the accounting against them. If there is domestic violence or a threat to safety, that is a different track through Family Court or the criminal courts with an order of protection, and it should be treated as an emergency rather than a property dispute. If a partner who is not on the deed refuses to leave, the owner generally has to go through the courts as well; this is one of the areas where the law changed in 2024 and the right procedure depends on the facts, so get advice before acting.

The hard truth: the co-owner who moves out voluntarily does not lose ownership, but they usually lose leverage and often keep paying half the mortgage for a house they no longer live in. Before you move out, get the financial arrangement in writing, even a simple signed letter covering who pays what until the house is sold.

How does a partition action work for an unmarried couple in New York?

A partition action for co-owners in Nassau or Suffolk County follows a fixed sequence in Supreme Court, and knowing the steps tells you where the settlement pressure points are.

Can I buy out my ex instead of selling?

Yes, and a buyout is the most common way these cases end. A buyout means you pay your ex the value of their share, adjusted for the credits each of you can prove, and your ex signs a deed transferring their interest to you. It requires a current appraisal, an agreed accounting, and usually a refinance so your ex is released from the mortgage.

What happens to the mortgage we both signed?