Co-buying (also called co-ownership) lets two (or more) households pool resources to afford a home they couldn’t buy alone. In high-cost markets like Southern California, this trend is growing fast. In fact, one report found that 14% of homebuyers purchased with a friend or partner in 2024, up from just 4% in 2022, and 44% of California mortgage applications now include a co-buyer. Two families can combine incomes, qualify for a larger loan, and share down payments and closing costs. Co-buying can make homeownership possible despite Southern California’s steep prices and tight inventory.

However, co-owning a house means sharing a major financial commitment and daily life. It requires open communication, legal planning, and trust. Experts warn that two co-owners (couples or families) face unique challenges since there’s no easy way to break a tie if disputes arise. Before signing on a joint mortgage, two families should understand California’s ownership options, mortgage rules, and the need for a detailed co-ownership agreement. Below we cover the key legal, financial, and practical steps two families should take before buying a home together in California.

Why Co-Buying Appeals to Two Families

California’s housing affordability crisis is driving creative solutions like co-ownership. By combining incomes and savings, two families can qualify for a larger loan and buy sooner. Yes, lenders do allow two families to buy a house together. Each household’s income and credit score count toward mortgage approval. In practice, lenders treat a co-borrower application like any other: they look at both parties’ credit, income history, and debt-to-income ratio. If both families meet the requirements, they can apply jointly. This can be a huge advantage when solo buyers fall short of minimums. For example, neither family alone might afford a home in Los Angeles or Orange County, but combined incomes can reach the threshold for a mortgage.

That said, co-borrowing has drawbacks: lenders consider each family’s credit and debts. If one family has poor credit, it could drag down the group’s approval odds. Also, co-buyers are jointly and severally liable on the mortgage; if one family misses a payment, the other must cover it. Despite these risks, many co-buyers find the benefits outweigh the cons. Nationally, co-buying is becoming mainstream: in California, nearly half of recent mortgage applicants had a co-applicant, up from a decade ago. Two families buying together can afford a home sooner, share upkeep costs, and even invest in multi-family homes or properties with granny units (ADUs) for extra income.

California Ownership Structures for Two Families

Once two families decide to co-buy, they must choose how to hold title. California law offers several co-ownership structures. The most common for unmarried co-owners are Tenancy in Common (TIC) and Joint Tenancy (JTWROS).

• Tenancy in Common (TIC): Each co-owner holds an undivided share of the property. Shares can be equal or unequal (for example, 60/40 split if one family paid more). Crucially, there is no right of survivorship. This means if one owner dies, their share passes to heirs by will (not automatically to the other co-owner). TIC is California’s default for multiple buyers, so unless you file paperwork saying otherwise, you’ll be tenants in common.
• Joint Tenancy (JTWROS): Co-owners have equal shares and equal rights to the whole property. The big difference is the right of survivorship: if one family member dies, their share automatically goes to the surviving owner(s) rather than heirs. Joint tenancy works well for couples, but is less common for unrelated co-buyers who want flexible ownership percentages.
• Community Property: Married couples (or registered domestic partners) in California automatically hold real estate as community property unless they state otherwise. So if each “family” is a married couple, each couple might internally hold their portion as community property. But the two couples together would likely structure as TIC or JTWROS for the overall property.
• Other options: In rare cases, co-owners form a partnership or LLC to buy property, but these are more complex and usually for investment properties. For two families looking to live together, TIC or joint tenancy is simpler.

Key takeaway: Discuss title at the start. Many experts recommend Tenancy in Common for flexibility (each family can own a defined percentage and will can dictate who inherits their share). Joint Tenancy with its survivorship feature may appeal if families want the simplicity of equal shares and one’s share moving to the other if someone passes. An attorney can explain tax implications or help set up trusts if needed, but understanding these basic forms is the first step in co-ownership.

Financing and Mortgage Tips for Co-Buyers

Financing a home with two families is similar to co-buying in any scenario. Both families will appear on the mortgage application. Combined income is usually a boon: it can get you approved for a higher loan amount, or qualify you when you couldn’t alone. However, the lender will treat the co-borrowers as a package. That means:

• Credit and debt matter for both: If one family has a low credit score or high debt, the lender adds it into the mix. This can hurt the application, even if the other family’s finances are strong.
• Up to 4 borrowers: While there’s technically no hard limit on co-owners, most conventional lenders cap the number of borrowers (often two to four). Co-buying usually involves just the two families (2–4 individuals), which is generally fine for mortgage rules.
• Loan types: Most co-buyers choose a standard 30-year fixed mortgage for stability. FHA loans often disallow unrelated co-borrowers, but conventional loans allow two families or even three individuals on one loan. If you plan to stay long-term, a fixed-rate loan shields you from rate swings. (Some co-buyers may consider adjustable-rate for short-term holding, but this is rarer.)

It pays to get pre-approved with a lender as a group. The lender will calculate a combined debt-to-income ratio using both families’ incomes and debts. If one family has any financial issues, address them early. For example, ensure no surprise liens or credit problems, since any issue affects both parties’ loan approval.

Mortgage checklist for two families:

• Check each family’s credit score and debt – aim to improve them if needed.
• Gather both families’ tax returns and income proofs for the last 2 years.
• Meet with a loan officer together. Ask about “joint borrower” or “multi-borrower” mortgage options.
• Know the maximum borrowers allowed on your desired loan product (Fannie Mae’s DU underwriter, for instance, often limits to 4 borrowers).
• Plan to equally share mortgage payments (the loan will list everyone as jointly responsible). You may decide to split payments in proportion to ownership or income, but legally the lender treats all co-borrowers as fully responsible for the entire loan.

Drafting a Solid Co-Ownership Agreement

One of the most important steps for two families is to create a written co-ownership (or cohabitation) agreement before closing. Think of this as the operating manual for your shared home. Attorneys and experts universally advise co-buyers to spell out the details in a legal document. Without it, default state rules apply, and any dispute could even end with a forced sale (partition) in court.

What goes in a co-ownership agreement? A good agreement covers at least these key areas:

• Ownership shares & title: Specify how much of the home each family owns. This depends on how much each paid for the down payment or what you agreed (for instance, 50/50). Clarify whether you hold title as TIC, joint tenants, or some entity.
• Financial contributions: Outline who pays what. This includes the down payment splits, mortgage payments, property taxes, insurance, utilities, and maintenance costs. For example, you might agree that each family pays 50% of every expense, or allocate percentages based on income or share.
• Decision-making: Decide how you will make big choices. Will it be unanimous consent for major actions (like selling, refinancing, or large renovations), or will majority rules apply? Spell out voting procedures for things like renting out part of the house or changing homeowners insurance. Decide ahead how to break ties – perhaps mediation or arbitration rather than court.
• Usage rules: Since two families living together need privacy, address who gets which parts of the house or schedule. Andy Sirkin, a co-ownership attorney, warns to set usage rules upfront rather than relying on goodwill, since usage disputes are very common. For instance, you may allocate bedrooms or wings, define guest policies, or outline quiet hours. Any extra contributions (like if one family renovates or adds on) should come with greater usage rights or compensation.
• Exit strategy: Plan for how someone can exit the arrangement. Can a family sell its share? Is there a right of first refusal (the other family gets the first chance to buy)? Specify how to value a share (appraisal or formula) and a timeline for buyouts. You should also cover what happens if one owner dies or becomes incapacitated – for instance, maybe surviving owners have a period to buy out heirs. Crucially, these exit details must be in writing from the start: litigating exit via partition is costly and uncertain.
• Other provisions: Include dispute resolution (e.g. mediation), notice requirements, and how to handle newcomers (if an heir inherits a share, can they join?). Also record the co-owners’ contact info, and which state’s law governs.

Key point: 96% of co-buyers struggle with creating an agreement. Most never draft one until conflict strikes. Yet CoBuy’s research shows that nearly every co-ownership requires it to work smoothly. Do not skip this step. Hire a real estate attorney (or use a reputable co-buying service) to formalize your agreement. That way, if financial or personal circumstances change, all parties know what to expect.

Living Together: Practical Tips for Two Families

Buying a house with another family means daily life will be shared. Here are some practical pointers:

• Find the right home: Look for properties suited to two households. Duplexes or homes with separate living areas (like a finished basement or mother-in-law suite) can give each family a semblance of privacy. In one story, co-buyers remodeled a split-level into two distinct units with separate kitchens. Even without full separation, homes with multiple bathrooms and clear sleeping wings work well. Discuss upfront how you’ll share common spaces like living rooms, yards, and parking.
• Align your lifestyles: Agree on rules such as guests, parties, noise levels and pet policies. Imagine if one family has small children and the other family is single professionals – their needs will differ. Make sure both families feel comfortable. Andy Sirkin cautions that usage rights should match contributions. For example, if one family paid more, they might get more usage (or vice versa). Plan these allocations in your agreement to avoid resentment.
• Share chores and maintenance: Decide who handles yard work, repairs, cleaning, and paying bills each month. Some co-owners split tasks (one does landscaping, the other home repairs) or share a schedule. It’s often wise to have a joint bank account or escrow arrangement for shared bills like taxes and insurance. CoBuy recommends preparing a budget with reserves for big expenses (roof, furnace, etc.) so funds are ready when needed.
• Communicate regularly: Treat the co-ownership like a partnership. Hold periodic check-ins to review budgets and plans. Since you’re sharing debt and property, misunderstandings can strain even family ties. The effort to discuss things early pays off. As one financial therapist advises, get transparent about money stress test scenarios (job loss, big repairs) before buying. This “financial nakedness” builds trust and preparedness.
• Plan for the unexpected: Life events (a job move, health issue, or new baby) can change what each family needs. Agree now how to handle changes. For instance, if one family wants to move out sooner, will they rent their rooms or sell their share? If one family cannot continue paying, will the other family buy them out? Co-buyers often assume “we’ll work it out,” but those issues should be in your written plan.

Key Takeaways for Two-Family Co-Buyers in California

• Co-buying can make housing affordable: By combining incomes and down payments, two families can jointly purchase a home that was out of reach solo. Southern California’s high prices are motivating more groups to co-own.
• Choose the right ownership structure: Most unrelated co-buyers in California use Tenancy-in-Common or Joint Tenancy. These affect how shares can be divided or inherited. Decide from the start how title will be held.
• Get a mortgage pre-approval together: Lenders look at the combined financial picture. Make sure both families qualify under the lender’s rules. Keep in mind, multiple borrowers will all share liability for the loan.
• Write a detailed co-ownership agreement: This is critical. A proper agreement (often called a co-ownership or cohabitation agreement) defines who pays for what, how decisions are made, and how to exit. Without it, default law can force a sale or leave you stuck. Outline shares, expenses, decision rules, dispute resolution, and exit terms in writing.
• Communicate and plan: Discuss lifestyle expectations and long-term goals. Set clear rules on money, responsibilities, and usage of the property. Remember, shared homeownership is like running a small business with family. Approach it with mutual respect, transparency, and a willingness to compromise.

By doing this homework ahead of time, two families can enjoy the benefits of homeownership without the pitfalls of miscommunication. Co-buying isn’t easy, but with careful planning it can turn a distant dream into reality.

Unlock Your Shared Homeownership Dream

Ready to turn your co-buying plan into action? Jack Ma Real Estate specializes in helping families and groups find the perfect home in Southern California. Our experienced agents understand how to navigate shared-ownership situations. We’ll help you identify properties well-suited for two families, coordinate with lenders and attorneys, and negotiate terms that protect everyone’s interests.

Take the next step: Contact Jack Ma Real Estate today at (909) 610-5188 or [email protected]. We’ll provide local market insights and guide you through every step of buying a home with another family. With Jack Ma Real Estate on your side, your shared homeownership journey will be smoother and more secure.

Frequently Asked Questions

Can two families really buy a home together in California? 

Yes. Lenders allow two families (or more) to co-borrow for a mortgage by combining their incomes. Both families must qualify individually for the loan. Typically, they also hold equal ownership rights on the property, so it’s important to agree on how the house will be used and who pays what upfront.

How do we split ownership and expenses? 

Co-owners usually choose a Tenancy-in-Common split that reflects each family’s contribution (for example, 50/50). Joint Tenancy (50/50 shares with survivorship) is another option if equality is agreed. You should outline expense sharing in your agreement: common practice is to split mortgage payments, taxes, insurance, utilities and maintenance according to each family’s ownership share or as negotiated.

Do we need a special agreement or lawyer? 

Absolutely. Almost every expert recommends a written co-ownership agreement before buying. This document (sometimes called a cohabitation agreement) spells out each family’s rights and duties – who pays what, who manages repairs, how decisions are made, and what happens if one family wants to sell. Without it, California law might force a sale through partition. A lawyer can draft this agreement to ensure it’s fair and binding.

What if one family wants to sell their share later? 

Your co-ownership agreement should address that scenario. Typically, families give each other a right of first refusal (so one can buy the other out before a sale to outsiders). If one family insists on selling, a clear buyout or sale process – with valuation method and timeline – prevents disputes. In absence of an agreement, any co-owner could legally force a sale (partition), which is usually undesirable.

Are there any mortgage programs just for co-buyers? 

There aren’t special loans labeled “co-buyer programs,” but co-buyers often use standard home loans. In practice, co-buyers usually get a conventional fixed-rate mortgage together. The key is that the loan and title will list all borrowers. CoBuy’s research notes that conventional loans often allow two to four people on the mortgage. Just be prepared that all co-borrowers’ credit will be checked together, and all are fully responsible for repayment.

Each of these steps will help two families co-buy a home more confidently. With clear planning and professional support, you can share the joys and responsibilities of homeownership in California. Good luck on your co-buying journey!