Co-Owning a Home with Friends or Family: Structures & Risks

Why co-ownership is growing in NZ

Two households pooling deposits and incomes can buy what neither could alone. Banks are comfortable with co-ownership; several actively promote 'co-own' pathways. The finance is the easy part — the governance is where it succeeds or fails.

The two legal structures

The mortgage reality: joint and several liability

Co-borrowers typically sign for the entire loan, jointly and severally. If your co-owner stops paying, the bank looks to you for the full repayment — your 50% ownership share does not create a 50% debt cap. Banks also assess everyone's income and debts together, so a co-borrower's finances shape (and limit) your collective borrowing. Some lenders can structure separate loan splits against a shared property, which limits (but doesn't remove) entanglement — worth exploring at placement.

The property sharing agreement: non-negotiable

Before settlement, a lawyer-drafted agreement should cover:

• Ownership shares and what each party contributed (deposit, costs).
• How mortgage, rates, insurance and maintenance are split — and what happens when someone can't pay.
• Occupancy: who lives there, whether rent is charged, what boarders are allowed.
• Exit mechanics: how a party sells out, how the price is set (valuation process), first right of refusal, forced-sale triggers, and timeframes.
• Death, relationship-property and insolvency scenarios.

Every co-ownership dispute we've seen traces back to a missing or vague agreement. The document costs hundreds; its absence costs friendships and five figures.

Practical tips from co-buy files that worked

1. Buy with people whose 5-year plans are compatible — the commonest exit trigger is one party's life changing.
2. Keep a joint account funded ahead for property costs; automate everything.
3. Insure each other: life and income-protection cover sized to the mortgage protects both parties.
4. Review the agreement (and the loan structure) at every refix.

Frequently asked questions

Can friends get a joint mortgage in NZ?

Yes — banks lend to friends and siblings buying together, assessing all applicants' incomes and debts jointly. Tenants-in-common ownership with a sharing agreement is the standard structure.

If my co-owner stops paying, am I liable?

Almost always yes — mortgage liability is typically joint and several, meaning the bank can pursue any borrower for the full amount regardless of ownership shares.

Can I sell my share of a co-owned house?

Legally, tenants-in-common shares are sellable — practically, your agreement should define the process: valuation, first right of refusal for co-owners, and timelines.

Does co-owning affect my KiwiSaver first-home withdrawal?

Each eligible first-home buyer in the purchase can generally use their own KiwiSaver withdrawal toward the shared deposit — eligibility is assessed per person.