The average home price in the US as of May 2026 sits above $368,000, according to Zillow, while the average annual household income is $66,622. From this data alone, it’s clear that housing costs outpace income growth.
Yet, having a place you can call your own is not something Americans are ready to give up on, so they’re getting creative. The most common scenario is buying property with friends, family members, or romantic partners (married or unmarried).
While this sounds like a great solution, even the best of friends can get into a fight and want to part ways. When this happens, the shared real estate becomes a burden if the owners didn’t sign a clear co-ownership agreement before buying.
What Is a Co-Ownership Agreement?
In plain terms, a co-ownership agreement is a private, written contract between people who share a property. It’s like a Tenancy in Common (TIC) agreement. The agreement spells out who contributes what, how expenses are handled, and what happens if someone decides to leave the arrangement.
The purpose of creating a well-drafted co-ownership agreement before entering into a joint real estate ownership situation is to draw clear lines for the most common what-ifs:
- How much of the down payment did each owner cover?
- Who pays for a broken water heater?
- What happens if one person wants to sell but the other doesn't?
- What happens to an owner’s share if they die unexpectedly?
By setting clear rules for expenses, property use, and exit strategies upfront, co-owners can avoid future partition litigation while protecting everyone’s financial interests and relationships.
Who Needs a Co-Ownership Agreement?
Young generations are bearing the full weight of the current economic realities, as around 33% of U.S. adults ages 18 to 34 live with their parents.
Co-ownership without the safety net of marriage can be young people’s way of leaving the nest and carving a path of their own. And anyone in this position should have a co-ownership agreement. It doesn’t matter if you’re siblings, romantic partners, or life-long friends; unclear co-ownership expectations almost always lead to messy legal situations later down the road.
Since a co-ownership agreement is a legally binding contract, you want to be thorough. In most cases, such a document needs professional legal oversight. Here is what Underwood Law recommends to include:
Financial Contributions and Equity
The agreement should document every dollar spent to avoid disputes over fairness later. Start with the initial costs (the down payment and closing costs), and continue with the division of ongoing expenses like mortgage payments, property taxes, insurance, and utilities.
The agreement should also include the equity split: Is ownership 50/50, or does it mirror the financial input (e.g., 70/30)?
Maintenance and Repairs
Disagreements often arise when one owner wants a luxury renovation, and the other only wants functional fixes. To prevent this problem from even rearing its head, include a major expense threshold in the agreement.
For instance, any renovation that goes over a set dollar amount (e.g., $1,000) requires unanimous consent before work begins.
The agreement should also include a clear definition of what constitutes emergency repairs and who should cover them. Include a clause that decides how an owner is reimbursed if they pay upfront to save the property.
Usage and Occupancy Rules
This section specifies who is allowed to live at the property full-time, who can lease a room, how long guests can stay, and what happens with long-term partners. Also, what happens if one of the owners decides to move out: must they offer their spot to the remaining owners before looking for a stranger?
The Exit Strategy
This is the most critical part of the document as it provides a roadmap for ending the partnership. Yes, this section is still critical even if you’re planning to get old together on the property.
Start by defining what causes a sale (death, disability, or simply a desire to move). Establish how the property will be valued and how long one owner has to buy out the other’s share. In case you can’t agree on a buyout, the agreement should outline the timeline for listing the home on the open market.
Dispute Resolution
To avoid expensive litigation, the agreement should include a section that mandates a process for breaking ties. You can decide between mediation, where a neutral third party steps in, or filing a lawsuit, where a private judge makes a final, enforceable decision.
The idea of sharing real estate, and the costs that come with it, with people you love (or at least genuinely enjoy spending time with) is undeniably appealing. After all, many people would love the chance to grow older surrounded by friends and family rather than awkward HOA meetings and mysterious upstairs neighbors.
The good news is that, with the right protections in place, shared ownership can work remarkably well. And if circumstances change over time, a clear agreement makes it much easier for everyone to move on amicably, without turning a real estate investment into a courtroom subplot.
