The Pros and Cons of Upsizing Your Home

Moving to a larger home usually means borrowing more while managing equity from your current property.

Families outgrow their first home for different reasons. An extra bedroom becomes necessary when a second child arrives, or a backyard matters more once toddlers start walking. The financing decision centres on how much equity you can access from your current property and whether you can service a larger loan amount without stretching repayments beyond what feels sustainable. A broker helps you structure the transition so you're not left with a loan that works on paper but creates pressure every month.

Can You Borrow Against Your Current Home While Selling It?

You can access equity from your existing property to fund the deposit on your next home, but timing determines which structure works. If you're buying before you sell, a bridging loan lets you purchase the new property while your current home is listed. You'll pay interest on both loans until settlement on the sale, usually for a few weeks to a few months. If you sell first and then buy, you'll use the sale proceeds as your deposit and apply for a single owner occupied home loan on the new property. Bridging adds cost but removes the risk of missing out on the right property because your sale hasn't settled.

Consider a family selling a unit they bought several years ago, now valued around $650,000 with $380,000 remaining on the loan. That leaves roughly $270,000 in equity. If they're purchasing a house at $920,000, they could use $184,000 from the equity as a 20% deposit and keep some funds aside for stamp duty and moving costs. A broker structures the bridging loan so interest capitalises during the overlap period, meaning no additional monthly payments until the sale settles. Once the unit sells, the bridging loan is repaid and the family continues with a single loan secured against the new property.

Should You Port Your Existing Loan or Start Fresh?

Some lenders allow you to port your current home loan to the new property, keeping the same rate and terms while increasing the loan amount. It works if your existing rate is lower than current variable rates and your lender offers portability. The limitation is that you'll need to apply for a top-up to cover the additional borrowing, and that top-up portion may be priced at a different rate. Most families refinance entirely when upsizing because it gives access to a wider range of home loan products and lets you renegotiate features like offset accounts or split rate structures that suit a larger loan.

Porting makes sense if you're still within a fixed rate period and break costs would outweigh the benefit of switching. In most other situations, refinancing gives you more control. A family moving from a $500,000 loan to a $740,000 loan might find that their existing lender's top-up rate is higher than what another lender offers on the full amount. Running a comparison across a few lenders usually identifies whether staying put or refinancing delivers lower repayments.

Fixed Rate vs Variable Rate for a Larger Loan Amount

A variable rate gives you flexibility to make extra repayments without penalty, which matters if you plan to use bonuses, tax returns, or other lump sums to reduce the loan faster. A fixed interest rate home loan locks in your repayments for a set period, which helps if you want certainty over the next few years while adjusting to higher household costs. A split loan combines both, giving you rate protection on part of the loan and flexibility on the rest.

When you're borrowing a larger amount, the choice affects how quickly you can build equity and how much interest you'll pay over time. A variable rate lets you link an offset account, so any savings in that account reduce the interest charged on your loan. If you're moving from a smaller property and your income has increased, putting surplus cash into an offset can cut years off the loan term. Fixed rates don't usually offer offset functionality, so you'll need to weigh the value of rate certainty against the ability to reduce interest as you go.

How Does Your Borrowing Capacity Change When Upsizing?

Your borrowing capacity depends on your income, existing debts, and living expenses. Lenders assess whether you can service the new loan amount at a higher interest rate than the actual rate you'll pay, usually adding a buffer of around 3%. If you've taken on new commitments since your last application, such as car finance or a higher credit card limit, those reduce how much you can borrow. If your income has increased or you've paid down other debts, your capacity improves.

A family earning $145,000 combined might have been approved for $580,000 a few years ago. If their income has lifted to $165,000 and they've cleared a car loan, their borrowing capacity might now sit around $800,000, depending on other expenses and the lender's serviceability model. Running a capacity check before you start looking at properties tells you the realistic price range and avoids the disappointment of finding the right home only to discover you can't borrow enough.

What Happens to Lenders Mortgage Insurance on a Larger Loan?

If your loan to value ratio sits below 80%, you won't pay LMI. If you're borrowing more than 80% of the new property's value, LMI applies to the portion above that threshold. The premium increases as the LVR rises, so a 90% LVR loan costs more in LMI than an 85% LVR loan on the same property. You can capitalise the LMI into the loan or pay it upfront at settlement.

Some families choose to borrow at a higher LVR to avoid selling their current property at a loss or to keep more cash available for renovations after moving in. Others prefer to wait until they've built more equity so the new loan sits at or below 80% and LMI doesn't apply. A broker shows you the LMI cost at different deposit levels so you can decide whether paying the premium now makes sense or whether it's worth adjusting your timeline or target price range.

Interest Only vs Principal and Interest for the Transition Period

An interest only loan means you're only paying the interest portion each month, not reducing the principal. It lowers your repayments in the short term, which can help if you're managing two properties during a bridging period or if cash flow is tight immediately after moving. The trade-off is that you're not building equity, and once the interest only period ends, your repayments will increase as you start paying down the principal.

Principal and interest repayments cost more each month but reduce your loan balance from the start. For most families upsizing into a long-term home, principal and interest makes sense because it builds equity and keeps the loan on track to be repaid within the agreed term. Interest only works as a temporary structure if you need breathing room during the transition, but you'll want to switch back to principal and interest once you've settled into the new property and your budget has adjusted.

Should You Keep Your Old Property as an Investment?

If your current property has strong rental demand and the rent covers most or all of the loan repayments, keeping it as an investment while buying a new owner occupied home can build your portfolio. You'll need to service both loans, and lenders assess rental income at around 80% of the actual rent to account for vacancies and maintenance. Your deposit for the new property will come from savings or other equity, not from selling the existing home.

This approach works if your income can comfortably support two loans and you're prepared to manage a tenanted property. It doesn't work if holding onto the old property means you can't borrow enough for the new one or if the rental return doesn't justify the holding costs. A broker runs the serviceability across both loans and compares the outcome against selling and using the full equity for your next purchase. That comparison shows whether keeping the property strengthens your position or limits what you can afford. You can explore more on this structure through investment loans.

What If You Need to Refinance Before You're Ready to Move?

Some families realise their current home loan rate is higher than what's available now, or they've built enough equity to remove LMI by refinancing before they upsize. Refinancing in advance can lower your repayments and improve your borrowing capacity when you're ready to move. The downside is that if you refinance and then apply for a new loan within a few months, lenders will reassess your financial position from scratch, and any changes to your income or expenses in that time will affect approval.

If your fixed rate is expiring soon and you're planning to upsize within the next year, refinancing to a competitive variable rate now gives you flexibility and avoids break costs later. If you're still locked into a fixed term with significant break costs, it usually makes sense to wait and refinance as part of the upsizing process. A broker checks the break cost estimate from your current lender and compares it against the savings from refinancing early. If you're managing a fixed rate expiry, the fixed rate expiry process helps you decide on timing.

Moving to a larger home involves more than finding the right property. The loan structure, deposit source, and repayment type all need to align with your income and timeline. Call one of our team or book an appointment at a time that works for you.