Upsizing From a Unit to a House in South West Sydney, NSW, Your Practical Guide
You've outgrown the unit. Maybe the second bedroom is now a home office that doubles as a nursery, or the strata fees are climbing while the space stays the same. Whatever the trigger, upsizing from a unit to a house in South West Sydney is one of the most common moves local buyers make, and it's one where the order of decisions matters more than most people realise.
The good news is that equity you've built in your unit does real work here. House medians across South West Sydney's core suburbs sit between $1.3 million in Liverpool and over $1.6 million in Revesby and Padstow, and for many unit owners, a few years of price growth has quietly closed the gap between where they are and where they want to be. Whether you're near Bankstown, in Moorebank, or looking at the Georges River suburbs, the lending question is usually not whether you can upsize, but how to structure it so you're not carrying two properties longer than you need to.
Our team at Infinity Mortgage Brokers helps families across South West Sydney, NSW work through exactly this move, comparing options across 40+ lenders. The upsizing home loan structure you choose, and the timing you build around it, is where most of the difference is made.
Key takeaways
- Equity in your unit can fund the deposit on a house without selling first.
- Bridging finance lets you buy before you sell, assessed on end debt, not peak debt.
- South West Sydney house medians range from $1.3M in Liverpool to over $1.65M in Padstow.
Can you use your unit's equity to buy a house in South West Sydney?
Yes, in most cases. If your unit has grown in value since you bought it, the equity, which is the gap between what it's worth and what you owe, can be accessed as a deposit for your next purchase. Most lenders will release equity up to 80% of the unit's current value without requiring lender's mortgage insurance, and some will go higher with LMI added. That usable equity, not savings, is often what makes the move possible sooner than upsizers expect.
How do lenders assess an upsizer moving from a unit to a house?
Lenders look at two separate questions when you're upsizing. First, they assess whether you can service the new loan on your income, using the APRA serviceability buffer of 3.0% added to the actual rate. Second, they assess the security, meaning whether the unit you're selling and the house you're buying both represent acceptable collateral. The order matters, because some lenders are more conservative than others on high-density unit postcodes when releasing equity.
Your existing unit mortgage doesn't disappear from the assessment. Until the unit sells, lenders treat both loans as live commitments, which is why your income and your debt position both need to comfortably support the transition period. If your unit is in a high-supply postcode, a small number of lenders may cap the LVR on the equity release, which affects how much deposit you can free up.
"Most upsizers we see underestimate how much equity they're sitting on, because they're comparing the current value to what they paid, not to what they owe. Once we run the numbers on usable equity at 80% LVR, the deposit gap they thought was years away is often already closed."
Dimitri Giannopoulos · Director, Infinity Mortgage Brokers · Chat to Dimitri →
What does it cost to upsize, and what will your deposit look like?
The deposit you need depends on how you're structuring the move. At 80% LVR on a $1.5 million house, you'd need $300,000. At 90% LVR with LMI, that drops to $150,000, but LMI at that loan size adds roughly $27,000 to $41,500 to the loan. Your unit's usable equity is usually the variable that decides which path is realistic.
The two main deposit routes for upsizers:
- › Equity release from the unit: access up to 80% of current value · no LMI on the equity release · requires a formal revaluation · available while you still own the unit
- › Sale proceeds as deposit: deposit confirmed once unit settles · no equity release needed · relies on simultaneous or prior settlement · timing risk if chains don't align
- › Bridging loan: buy the house before the unit sells · assessed on end debt, not peak debt · interest capitalises during the bridge · typically 6 to 12 months
Beyond the deposit, stamp duty applies to the new purchase at full transfer duty rates, since upsizers are not first home buyers and there's no concession for an established house at these price points. Budget for conveyancing, a building and pest inspection, and any break costs if your unit loan is still in a fixed rate period. These costs don't have published figures this file can hold, so a conveyancer quote before you exchange is the right step.
Source: CoreLogic (via YIP, mid-2026) and APRA.
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Which South West Sydney suburbs suit upsizers making this move?
CoreLogic data shows house medians across the area ranging from $1,339,000 in Edmondson Park and $1,363,000 in Wattle Grove at the more accessible end, through to $1,622,000 in Revesby and $1,653,000 in Padstow at the mid-to-upper range. Suburbs like Moorebank($1,470,000, +9.29% growth) and Milperra($1,550,000, +10.83%) offer house blocks with Georges River access, while Chester Hill($1,403,000, +14.76%) has delivered the strongest growth in the core Canterbury-Bankstown area over the past twelve months.
For families near Bankstown who want more land without leaving the area, Milperra and Moorebank both offer established houses within reasonable reach of the motorway spine and the Georges River green corridor. Families upsizing for school catchments often look at Revesby and Padstow for the T8 line access and the mix of primary schools in the immediate area.
Source: CoreLogic (via YIP, mid-2026).
When does upsizing from a unit not make sense right now?
If your unit has grown strongly but your income hasn't kept pace with house prices, the serviceability test can catch you even when the deposit looks solid. A large equity release that funds the deposit doesn't reduce what the lender assesses you can afford to repay each month, and the two don't always move together. That's the scenario where waiting another year, or adjusting the target price band, changes the outcome more than any lender or rate choice can.
It's also worth pausing if your unit is in a fixed rate period with meaningful break costs. Selling while fixed can add tens of thousands in exit fees that erode the equity you planned to use. And if you're planning to keep the unit as a rental rather than sell it, the rental income will be shaded to around 80% of gross by most lenders, while the full unit mortgage stays as a commitment. Holding both properties is achievable for the right income profile, but it's a materially harder serviceability position than selling and moving.
"If I were in an upsizer's position and the unit was still fixed, I'd want to know the exact break cost before doing anything else. That number can flip a decision. We pull that figure in the first conversation, because it changes what sequence makes sense."
Dimitri Giannopoulos · Director, Infinity Mortgage Brokers · Chat to Dimitri →
How do you upsize from a unit to a house in South West Sydney, step by step?
Step 1: Talk to us
We start by working out your usable equity, your current serviceability position, and which of the three paths, equity release, bridging, or sale-first, suits your timeline and income.
Step 2: Get a valuation and confirm your equity position
We order a formal lender valuation of your unit, confirm the usable equity at 80% LVR, and work out the deposit available for the house purchase alongside any break-cost calculations on your existing loan.
Step 3: Match to the right lender and structure the application
We identify which lenders on our panel will accept your unit's postcode for equity release, and which offer the bridging or equity product that best fits your timing, then prepare and submit the application.
Step 4: Manage settlement through to handover
We coordinate with your conveyancer on both settlements, manage any bridging period, and make sure the loan transitions cleanly from peak debt to the end loan once your unit settles.
What approval challenges do upsizers from units face?
The hurdles worth knowing before you start:
- › High-density unit postcodes: some lenders cap the LVR on equity release where the unit is in a high-supply apartment block, reducing how much deposit you can access before needing LMI.
- › Carrying both loans through the bridge: serviceability is assessed on end debt, but lenders still stress-test the peak position to satisfy themselves you can cover it if the unit takes longer to sell.
- › Stale valuations: a unit valued six months ago may not reflect current market conditions, and some lenders require a fresh valuation before they'll release equity, adding time to the process.
- › APRA's DTI cap: where combined debt across the unit mortgage and the new house loan pushes the debt-to-income ratio above six times gross income, some lenders will decline under APRA's high-DTI lending limits, even where servicing looks manageable month to month.
Frequently Asked Questions
Can I keep my unit as a rental when I buy the house?
Yes, but lenders will assess the full unit mortgage as a commitment and shade the rental income to around 80% of gross. The serviceability position is materially harder than selling, so it depends on your income and the combined debt level.
Do I need to sell my unit before I can buy a house?
No. You can access equity from your unit while still owning it, or use bridging finance to buy before the unit settles. Which path suits you depends on your equity position, your income, and your timeline.
Is bridging finance assessed on both mortgages at once?
No. Bridging finance is assessed on the end debt, which is the loan balance remaining after your unit's sale proceeds are applied. That's usually a much more manageable number than the peak debt during the bridge.
What's the difference between an equity release and a bridging loan?
An equity release draws funds from your existing unit loan to use as a deposit, while the unit stays security. A bridging loan combines both properties as security for the whole peak debt, then converts to a standard loan once the unit sells.
Will stamp duty apply when I buy the house?
Yes, full transfer duty applies to the house purchase. There's no first-home-buyer concession for an upsizer, and at South West Sydney house price levels most purchases sit above the concession thresholds. A conveyancer can give you the exact figure once you have a purchase price.
Should I use a mortgage broker or go directly to my current lender?
A mortgage broker, every time. Upsizing involves an equity release, a new purchase loan, and often a bridging structure, and your current lender is one option across a market where lender policy on high-density postcodes, bridging terms, and DTI ratios all differ. Comparing across the panel is where the outcome is decided.
Your Next Steps
The unit-to-house move is rarely as complicated as it looks, and rarely as straightforward as it feels when you first run the numbers. The equity position, the break costs, the serviceability across both loans, and the timing of both settlements all interact, and getting one of them wrong is where upsizers lose time and money. Getting all of them right at the same lender, at the same time, is exactly what a broker who does this locally every week is for.
If upsizing from a unit to a house in South West Sydney is where you're headed, the next step is a conversation. Contact the Infinity Mortgage Brokers team or call 0426 955 190. We'll work through where you stand across our 40+ lender panel and find the structure that gets you into the house without the stress.
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External Resources
Infinity Mortgage Brokers, Bankstown and South West Sydney. This website is general information only and does not constitute financial advice. Please consider your own circumstances and seek professional advice before making any financial decisions.
