Homeownership doesn’t have to be a solo mission. Buying a home with a friend or sibling can help make homeownership more attainable by combining savings, sharing expenses and building equity together. According to the Ontario government’s guide to co-owning a home, pooling financial resources can make homeownership more affordable and give buyers access to neighbourhoods they might not be able to afford on their own.
But before you start browsing listings together, you need a plan for more than the down payment. A co-ownership agreement is a written legal contract that outlines each buyer’s rights, financial responsibilities and expectations for sharing a property. It can help protect your investment, prevent misunderstandings and keep your friendship or sibling relationship on solid ground.
Here’s what to cover before buying a home with friends or family.
1. Ownership Shares and Down Payment Contributions
Start by deciding who owns what percentage of the property.
You might split ownership equally, or you might agree on different shares based on each person’s financial contribution. For example, one sibling could contribute 60% of the down payment while the other contributes 40%. Your agreement should document each person’s initial contribution, ownership percentage and how you’ll divide the proceeds if you eventually sell.
You should also decide how to register ownership on the property title. In Ontario, joint tenancy generally means a deceased owner’s interest passes to the surviving owner or owners, while tenancy in common allows each owner’s share to pass through their estate. The Ontario government explains these options in its co-ownership guide.
2. Mortgage Payments and Monthly Expenses
Sharing a mortgage means sharing financial responsibility, so get specific about the numbers before you buy.
Your agreement should explain how you’ll split mortgage payments, property taxes, home insurance, utilities, internet and routine maintenance.
It should also cover major expenses, including emergency repairs, appliance replacements and renovations. Consider creating a shared emergency fund so an unexpected roof repair doesn’t become a financial crisis.
The Ontario government’s guide to financing a co-owned home recommends discussing contributions, ongoing costs and financing arrangements before purchasing.
Remember that your ownership percentage and your mortgage obligations are not necessarily the same thing. Ask your lender and lawyer how liability works under your specific mortgage, including what happens if one co-owner stops paying.
3. Living Arrangements and Household Rules
Buying together means agreeing on how you’ll actually live together.
Your agreement should outline who gets which bedroom, how you’ll use shared spaces and how you’ll divide household chores. It should also address guests, overnight visitors, pets, quiet hours and whether partners can move in. If one person wants to rent out their room, establish whether that’s allowed and whether the other owners must approve the arrangement.
These conversations might feel awkward before you’ve even found a house, but setting expectations early can prevent bigger conflicts later.
4. Repairs, Renovations and Decision-Making
Not every home decision needs a group meeting, but you should know which decisions require everyone’s approval.
Your agreement can establish spending limits for routine purchases and outline how you’ll approve major renovations, upgrades or unexpected repairs. For example, one co-owner might handle small maintenance requests while all owners must agree before spending thousands of dollars on a kitchen renovation.
You should also decide how to divide maintenance responsibilities and what happens if someone repeatedly fails to contribute their agreed share of the work or expenses. The Ontario government recommends documenting decision-making procedures, upkeep responsibilities and financial arrangements in a co-ownership agreement.
5. What Happens if Someone Wants Out?
This is one of the most important parts of your agreement.
Your plans might change if a co-owner gets a new job, wants to move in with a partner, experiences financial difficulties or simply decides it’s time to buy a place of their own. Agree on an exit process before these situations arise. Your agreement should establish how much notice someone must give, whether the remaining owners get the first opportunity to buy their share and how you’ll determine the property’s fair market value.
You should also outline what happens if the remaining owners cannot afford a buyout or if nobody agrees on the sale price. The Ontario government recommends setting clear procedures for owners who want to leave, including how to value a share and whether the remaining owners or a third party can purchase it.
6. Disagreements and Unexpected Life Changes
Even the closest friends and siblings can disagree about money.
Your agreement should explain what happens if someone misses mortgage payments, refuses to fund a necessary repair or breaches the terms of the contract. Consider including a dispute-resolution process, such as mediation, before disagreements escalate into costly legal proceedings.You should also discuss how the arrangement would change if a co-owner dies, becomes unable to contribute financially or experiences a major life change.
Planning for these possibilities doesn’t mean expecting the worst. It means giving everyone a clearer path forward when life gets complicated.
7. Get Legal Advice Before You Buy
Once you’ve discussed the details, work with a real estate lawyer to prepare a co-ownership agreement that reflects your arrangement. Your lawyer can help clarify ownership rights, review the title structure, address exit provisions and explain how your agreement interacts with your mortgage and other legal obligations. You should also speak with your lender early to understand your combined borrowing capacity and each buyer’s responsibilities.
The Ontario government recommends obtaining professional legal advice when preparing a co-ownership agreement. Its guide is a useful starting point, but rules and requirements can vary across Canada.
Co-Buying Can Make Homeownership More Attainable
Buying a home with a friend or sibling won’t eliminate the costs or responsibilities of homeownership, but it can give you another way to enter the market. Pooling savings, sharing expenses and building equity together can help turn a long-term goal into a more realistic plan.
The key is to treat the purchase like both a financial investment and a shared commitment. Talk openly, put your expectations in writing and get professional advice before signing. With the right planning, buying a home together can be a meaningful first step toward building financial stability and a place to call your own.
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