Buying a House with Friends: A Guide to Co-Ownership Agreements and Hidden Risks
A quick heads-up before we dive in: This article is strictly for general informational purposes and does not constitute financial, legal, or tax advice. Co-owning property involves significant financial and legal risks. Every situation is entirely unique, and rules and lending policies change frequently. Before making any decisions, signing any documents, or committing to a property purchase, it is highly recommended that you seek independent advice from a qualified financial adviser and a registered property lawyer.
With property prices and living costs where they are, buying a home solo can feel like a steep uphill climb. It is no surprise that teaming up with friends, siblings, or extended family to get on the property ladder is an idea many New Zealanders are exploring.
Pooling your deposits and splitting the mortgage can be a creative way to break into the market sooner. But while you might be great flatmates right now, property ownership is a serious, decades-long financial and legal commitment. It is a space where a simple "handshake agreement" can quickly lead to complex financial heartache.
If you are considering teaming up, it is crucial to understand exactly what you are signing up for, how the banks view the arrangement, and why having a robust legal framework is an absolute necessity.
The Reality Check: Positives and Potential Pitfalls
Before looking at mortgages or attending open homes, it pays to have a very honest conversation about the realities of co-ownership. While the benefits are clear, the risks are often invisible until something goes wrong.
| The Potential Positives | The Critical Risks to Consider |
|---|---|
| Shared Deposit Burden: Pooling savings might help you reach a 20% deposit faster, potentially avoiding low-deposit interest rate premiums. | Joint Liability: The bank generally views you as responsible for the entire mortgage, not just your half. If your friend can't pay, you may have to cover their share. |
| Combined Servicing Power: Two incomes assessed together can sometimes unlock a higher overall borrowing capacity than applying individually. | Complex Exit Strategies: If your friend wants to sell in three years to move overseas and you want to stay, a forced sale can be incredibly stressful. |
| Split Running Costs: Council rates, insurance, and unexpected maintenance bills (like a broken hot water cylinder) can be divided. | Relationship Property Risks: If your co-owner's romantic partner moves in, complex relationship property laws can suddenly apply to the home. |
| Market Entry: It could potentially allow you to stop paying rent and start putting money toward an asset you partially own. | Strained Friendships: Property ownership amplifies relationship dynamics. Disagreements over money or maintenance can permanently damage a friendship. |
How the Banks View Co-Ownership
When you buy a house with a friend, it is vital to understand that the bank rarely splits the debt neatly down the middle. In fact, banks tend to view "multi-household" mortgages (friends buying together) with a bit more caution than standard couple applications. Here is what they are looking at:
1. Joint and Several Liability
This is the biggest hurdle. In the banking world, a concept called "joint and several liability" almost always applies. This means that if you and a friend take out a $600,000 mortgage together, the bank views both of you as being individually responsible for the entire $600,000 debt. If your co-owner loses their job, decides to stop paying, or vanishes, the bank will generally look directly to you to cover the full monthly repayment to avoid a default.
2. Stricter Servicing Tests
Because friends are statistically more likely to have life changes that cause their paths to diverge (like meeting new partners or moving overseas), some banks apply stricter "stress tests" to your income. While some banks might simply combine your incomes to see if you can afford the whole debt, other more conservative lenders might check to see if each individual could carry a significant portion of the entire mortgage on their own before they say yes.
3. The Future Borrowing Trap
If you want to buy an investment property or a home with a new partner five years from now, that shared mortgage will follow you. Even though you might only own 50% of the property's equity, the new bank will often assess 100% of the shared mortgage as your personal liability. This can severely restrict your future borrowing capacity.
The Rulebook: Property Sharing Agreements (PSA)
Because of the heavy legal and financial risks, going into a co-ownership arrangement without a formal legal contract is highly discouraged—and often, the banks will outright refuse to lend to you without one.
A Property Sharing Agreement (PSA)—sometimes called a Co-Ownership Agreement—is a private contract drawn up by lawyers. It acts as the ultimate rulebook for your property journey together. To ensure it is fair, it is heavily recommended that each person gets independent legal advice from separate lawyers before signing.
While every PSA is unique to the group buying the house, they typically aim to cover:
Ownership Shares: Exactly what percentage each person owns (e.g., 50/50, or 60/40 if someone contributed a larger deposit) and ensuring the property is registered as "Tenants in Common" rather than "Joint Tenants."
Cost Splits: How the mortgage, insurance, rates, and emergency maintenance bills will be funded and paid.
The Exit Strategy: What happens if someone wants to sell their share? Can the other person buy them out? How is the property valued? What happens if neither can afford the whole mortgage?
Default Scenarios: What legally happens if one person stops paying their share of the mortgage?
The Hidden Risk: The Relationship Property Act
This is an area where co-ownership can become incredibly complicated very quickly.
In New Zealand, the Property (Relationships) Act (PRA) governs how assets are divided when romantic relationships end. Always take your solicitors advice on this but generally, if a couple lives together in a de facto relationship for three years (and sometimes less), the family home can be considered "relationship property" and subject to a 50/50 split.
How does this affect friends buying together? Imagine you and a friend buy a house. A year later, your friend's new partner moves into the spare room. If they live together in that house for three years, they may be classified as being in a de facto relationship. If they later break up, that partner might potentially have a legal claim against your friend's share of the property.
To protect the arrangement, lawyers will often advise that any co-owner whose romantic partner moves in should have a formal "Contracting Out Agreement" (often known as a pre-nup colloquially) in place with their partner. This is a complex area of law, which is why having a property lawyer on your team from day one is essential.
Check Your Motivations: How It Can Go Wrong
Property ownership is a marathon. Before signing anything, it is worth asking some tough questions about why you are teaming up, and whether your life timelines actually align.
Different Timelines: Do you plan to own this house for three years, while your friend wants to hold it for ten? A forced sale at a bad time in the market can erode any financial gains you made.
Financial Disparity: Does one person have a massive deposit and clean credit, while the other has consumer debt and unstable income? If the arrangement feels unbalanced from the start, the stronger buyer is essentially subsidising the risk of the weaker one.
Communication: If you already find it awkward to ask your friend to pay their share of the grocery bill, navigating a 30-year mortgage together is likely to be highly stressful.
The Bottom Line: Get Independent Guidance
Buying a home with friends can be a viable path to homeownership, but it is not a shortcut around the rules—in fact, it requires far more planning and legal protection than buying alone.
If you and your friends are exploring this option, the absolute best first step is to sit down with a professional to see if the numbers actually work. At Home Loan Factory, we can review your combined financial situation, explain how different banks might view your application, and point you in the right direction for the legal advice you will need to keep everyone safe.
Considering teaming up to buy? Get in touch with the team at Home Loan Factory today to explore your options with a clear, entirely confidential, and zero-obligation chat.
