Building a new home while you still own your current property creates two simultaneous financial obligations.
A bridging loan can fund builder payments and cover holding costs on both properties during construction, with interest capitalised so you're not servicing three loans from your take-home pay. The structure works when you have a clear exit through the sale of your existing home once the new build is complete.
How Bridging Finance Works During a Construction Period
Bridging finance covers the gap between buying or building your next property and selling your current one. During construction, the loan services holding costs on your existing home and progressive builder payments on the new property, with all interest capitalised and repaid when your original home sells.
Consider a family in Baulkham Hills building a new home in Kellyville while still living in their current property. Their existing mortgage is $450,000, their home is worth approximately $1,995,000, and their builder requires five progress payments totalling $780,000 over 12 months. They arrange bridging finance for $850,000, which covers the full construction cost plus capitalised interest during the build. The loan is secured against both properties. Once the new home is complete and they move in, they sell the Baulkham Hills property, repay the bridging loan in full, and refinance the new home with a standard construction loan that converts to a variable or fixed home loan.
The bridging period typically runs from the first builder payment through to settlement of your existing property sale. Most lenders approve bridging terms between six and twelve months, though some will extend to 24 months if the construction timeline or sale strategy requires it.
What Costs Are Covered by Capitalised Interest
Capitalised interest means the lender adds interest charges to your loan balance each month rather than requiring you to pay them from your income. This covers the interest on the bridging loan itself, plus ongoing costs on your existing mortgage if that loan is also rolled into the bridging structure.
In our Baulkham Hills example, the family's monthly holding costs include approximately $2,100 in interest on their existing mortgage, $550 in rates and strata for both properties, and bridging loan interest on the accumulated builder payments. All of these costs are added to the loan balance each month. Over a 12-month construction period, total capitalised interest might reach $65,000 to $75,000 depending on the bridging loan interest rate applied by the lender. The final loan balance at sale would be around $915,000 to $925,000.
Lenders calculate serviceability assuming you can afford to repay the final capitalised balance, not just the initial loan amount. They also assess your ability to service the end debt once you refinance, so your income needs to support the new home loan after the bridging loan is repaid.
Bridging Loan LVR and Security Requirements
Lenders assess bridging loans using peak debt, which is the highest combined balance across both properties during the bridging period. Most lenders cap bridging finance at 80% LVR on an unencumbered basis, though some will go to 90% with lender's mortgage insurance.
Peak debt is calculated as the sum of your existing mortgage balance, all builder payments, and total capitalised interest, divided by the combined value of both properties. If that figure exceeds 80%, you'll either need to contribute additional cash during construction or accept a higher interest rate and insurance premium.
In the Baulkham Hills scenario, the family's peak debt is approximately $925,000. Their existing home is worth $1,995,000 and the new Kellyville property will be valued at around $1,970,000 on completion, giving a combined security value of $3,965,000. Peak LVR is 23%, well within all lender limits. That low LVR also gives them access to competitive bridging loan interest rates, typically within 1% of standard variable home loan rates.
Builder Payment Schedules and Progressive Drawdowns
Most residential building contracts require five to six progress payments tied to construction milestones such as slab down, frame up, lockup, fixing stage, and practical completion. Your bridging loan is drawn progressively as each payment falls due, not as a lump sum upfront.
The lender will typically require a quantity surveyor or building inspector to verify each stage is complete before releasing funds to the builder. This protects both you and the lender from paying for incomplete work. Each drawdown increases your loan balance and the amount of interest being capitalised.
You'll need to notify your broker or lender at least a week before each builder payment is due so the inspection and drawdown can be arranged in time. Missing a builder payment can put your construction contract at risk, so managing the drawdown schedule is one of the more important administrative tasks during the bridging period.
When to Sell Your Existing Property
Most buyers using bridging finance during construction list their existing home for sale once the new build reaches lockup or fixing stage. Listing earlier creates the risk of selling before the new home is ready, leaving you without somewhere to live. Listing too late extends the bridging period and increases capitalised interest.
In areas like Baulkham Hills where the median house sells within 30 to 40 days, listing at lockup typically allows enough time for marketing, exchange, and a 30 to 42 day settlement period that aligns with practical completion of the new build. If the market softens or your property requires a longer campaign, you may need to extend the bridging loan term or accept a delayed move-in date.
Some lenders require you to list the property within a set timeframe, often within six months of the first drawdown, and will only extend the bridging term if you can demonstrate genuine marketing efforts. Others take a more flexible approach and trust your judgment on timing, particularly if your LVR is low and there's no servicing pressure.
Bridging Loan Approval and Application Requirements
Lenders assess bridging loan applications using the same credit and income criteria as standard home loans, plus additional scrutiny on your exit strategy and construction timeline. You'll need a signed building contract, council-approved plans, evidence of builder insurance, and a valuation of the completed property.
The lender will also want to see a realistic sale price estimate for your existing home, supported by recent comparable sales or an appraisal from a local agent. If the numbers show your exit strategy leaves you with insufficient equity to refinance the new home or repay the bridging loan, the application will be declined regardless of your income.
Approval timeframes are typically two to three weeks for a straightforward bridging loan application, longer if the lender requires a full valuation on both properties or if your income structure is complex. Fast approval is possible if you're working with a broker who knows which lenders have appetite for bridging finance and can structure the application to meet their criteria from the outset.
Bridging Loan Risks During Construction
The two most common risks are construction delays and a slower sale than expected. Both extend the bridging period, increase capitalised interest, and may require you to refinance the bridging loan if it reaches its maximum term before your property sells.
Construction delays are often outside your control, caused by weather, supply shortages, or builder insolvency. If your builder goes into administration, the bridging loan is still owing and you're left with an incomplete property and no income to service the debt. Most lenders require builders to hold contract works insurance and homeowner warranty insurance, but these don't eliminate the financial impact of a delayed build.
A slow sale is more manageable but still problematic. If your property sits on the market for four or five months without an acceptable offer, you'll either need to reduce the price, extend the bridging term, or find another way to repay the loan. Lenders will typically allow one extension of three to six months, but they'll want evidence you're actively marketing the property and will often insist on a price reduction as a condition of the extension.
Bridging Finance Costs and Fees
Bridging loans carry higher interest rates than standard home loans, typically 1% to 2.5% above the lender's variable home loan rate. Application fees, valuation fees, legal fees, and discharge fees can add another $3,000 to $6,000 to the total cost.
Some lenders also charge a line fee or facility fee for the progressive drawdown structure, typically 0.5% to 1% of the total loan amount. In the Baulkham Hills example, a 1% line fee on $850,000 would be $8,500, usually deducted from the first drawdown.
All of these costs can be capitalised into the loan balance if you prefer not to pay them upfront, though that increases your peak debt and total interest cost. It's worth modelling both options with your broker before proceeding, particularly if you're close to an LVR threshold.
Alternatives to Bridging Finance for Construction Cash Flow
If bridging finance costs feel prohibitive or your exit strategy isn't certain, the main alternative is to sell your existing home first and rent while you build. You lose the convenience of a seamless transition, but you avoid capitalised interest and remove the risk of holding two properties during construction.
Another option is a family loan or equity contribution from a guarantor, which can reduce the bridging loan amount and improve your LVR. Some buyers also negotiate extended settlement terms with the land vendor or builder payment terms that defer a portion of the cost until later in the build, though both are uncommon in the current market.
For buyers with investment property portfolios, releasing equity from an existing investment can sometimes fund the build without needing to sell the family home, though this depends on your overall serviceability and debt position.
Call one of our team or book an appointment at a time that works for you. We'll walk through your build timeline, your sale strategy, and structure the bridging loan so it supports both without leaving you overextended if something shifts along the way.
Frequently Asked Questions
How does capitalised interest work during a construction bridging loan?
Capitalised interest means the lender adds monthly interest charges to your loan balance instead of requiring payment from your income. This covers interest on the bridging loan, ongoing mortgage costs on your existing property, and holding costs on both properties. The total is repaid when your original home sells.
What is peak debt and why does it matter for bridging loan approval?
Peak debt is the highest combined loan balance across both properties during the bridging period, including your existing mortgage, all builder payments, and capitalised interest. Lenders use this figure to calculate your loan to value ratio, and most cap bridging finance at 80% LVR on peak debt.
When should I list my existing property for sale during a construction build?
Most buyers list once the new build reaches lockup or fixing stage. Listing earlier risks selling before the new home is ready, while listing too late extends the bridging period and increases capitalised interest. In areas like Baulkham Hills where properties sell within 30 to 40 days, listing at lockup usually aligns settlement with practical completion.
What happens if construction is delayed or my property takes longer to sell?
Construction delays or a slow sale extend the bridging period and increase capitalised interest. Lenders typically allow one extension of three to six months, but may require evidence of active marketing or a price reduction. If the delay is significant, you may need to refinance the bridging loan or find another exit strategy.
Can I avoid bridging finance by selling my home first and renting during construction?
Yes, selling first and renting during the build avoids capitalised interest and removes the risk of holding two properties. You lose the convenience of a seamless transition, but it's a lower-cost option if your exit strategy isn't certain or if bridging loan costs feel prohibitive.
