A construction loan for an extension works differently from a standard home loan because funds are released in stages as the work progresses, not as a single upfront amount.
Extending your home in Eagleby involves more than engaging a builder and signing off on plans. The way lenders assess and fund extensions differs from refinancing or purchasing, particularly when it comes to the draw schedule and how interest accrues during construction. Understanding these differences means fewer surprises during the build and more control over costs.
How construction finance differs from standard home loans
With a standard home loan, you receive the full amount at settlement. With construction finance, the loan amount is drawn down progressively as the builder completes each stage of work. You only pay interest on the amount drawn, not the total approved loan amount. This structure reduces your interest costs during the build but requires coordination with the builder and lender at each stage.
Most lenders use a five or six stage progress payment schedule. Typical stages include base, frame, lock-up, fixing, and practical completion. Each drawdown requires a progress inspection by the lender's valuer or representative before funds are released to the builder. This protects both you and the lender by ensuring work is complete before payment is made.
Council approval and development applications in Eagleby
Logan City Council governs development approvals in Eagleby. Before a lender will approve construction finance, you need either an approved development application or confirmation that the extension falls under accepted development and does not require council consent. Most extensions that increase the building footprint or alter the roofline will require a development application, which can take several weeks to several months depending on the scope.
Lenders will not release funds until you provide evidence of council approval and a fixed price building contract with a registered builder. If you are planning structural changes or adding a second storey, expect the approval process to take longer and factor this into your timeline. You can find more information about local requirements through Logan City Council.
Fixed price contracts and cost plus arrangements
A fixed price building contract sets out the total build cost and the progress payment schedule. This is the preferred structure for most lenders because it provides certainty around the final loan amount. The contract should itemise each stage, the payment due at each stage, and the expected completion timeframe.
Some builders offer cost plus contracts, where you pay the actual cost of materials and labour plus a margin. These are harder to finance because the final cost is not fixed, which creates uncertainty for the lender. If you are considering a cost plus arrangement, expect fewer lender options and potentially higher scrutiny during the application process.
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The construction draw schedule and how it works
The construction draw schedule determines when funds are released to your builder. Most lenders structure this around five stages: base (including slab or stumps), frame, lock-up (external walls and roof complete), fixing (internal fit-out including plumbing and electrical), and practical completion.
At each stage, the builder notifies you that the work is complete and requests payment. You then notify the lender, who arranges an inspection. Once the inspection confirms the stage is complete, the lender releases the funds directly to the builder or into your account, depending on the loan structure. This process typically takes three to five business days, so builders need to factor in this delay when scheduling trades.
Some lenders charge a progressive drawing fee for each inspection, typically between $150 and $400 per drawdown. Others include inspections as part of the loan package. Knowing these fees upfront helps you budget accurately for the total project cost.
Interest during construction and repayment options
During the construction phase, most borrowers are on interest-only repayments, calculated only on the amount drawn down so far. Consider a scenario where your extension is approved for $120,000 and the base stage represents 15% of the total contract price. After the first drawdown of $18,000, you pay interest only on that amount, not the full $120,000.
As each stage is completed and further funds are drawn, your interest repayment increases. Once construction reaches practical completion, the loan converts to principal and interest repayments, or remains interest-only if you have structured it that way. This is known as a construction to permanent loan, and it avoids the need to refinance once the build is finished.
What lenders assess when approving construction finance
Lenders assess construction loan applications differently from standard home loan applications. They consider your ability to service the loan once construction is complete, the adequacy of the fixed price building contract, the builder's credentials, and the end value of the property including the extension.
The builder must be registered and hold appropriate insurance. In Queensland, builders undertaking work valued over $3,300 must be licensed through the Queensland Building and Construction Commission. Lenders will verify this before approving the loan. They also assess whether the proposed extension represents a reasonable use of funds relative to the property's projected value. If the extension costs more than the likely increase in property value, some lenders may decline or reduce the loan amount.
Your serviceability is calculated on the full loan amount at principal and interest repayment rates, even though you will initially pay interest only on a smaller drawn amount. This ensures you can afford repayments once the extension is complete and the loan converts to standard repayments.
Owner builder finance and how it differs
If you are planning to act as an owner builder, financing becomes more complex. Most mainstream lenders do not offer construction finance to owner builders due to the higher risk of cost overruns and delays. Specialist lenders do provide owner builder finance, but typically at higher interest rates and with lower maximum loan-to-value ratios.
Owner builders also face stricter drawdown conditions. Rather than releasing funds based on builder progress claims, lenders may require detailed invoices from subcontractors and suppliers before releasing each drawdown. This adds administrative work and can delay payments to trades, which in turn can affect the build timeline. If you are considering going down this path, factor in additional time and costs for managing the process.
Timing and when construction must commence
Most construction loan approvals include a condition that building must commence within a set period from the disclosure date, usually six to twelve months. If construction has not started within this period, the approval may lapse and you will need to reapply.
This can be a concern if council approval or builder availability causes delays. Once you have loan approval, work with your builder to lock in a start date and ensure all preconditions such as council approval and final plans are in place. If delays occur, contact your lender or mortgage broker in Eagleby to discuss extending the approval period before it lapses.
How to structure your application
A well-prepared construction loan application includes the following: a fixed price building contract with a registered builder, evidence of council approval or confirmation that approval is not required, detailed building plans, a progress payment schedule, proof of income and employment, and any additional funds you are contributing to the project.
Gathering these documents before applying speeds up the assessment process and reduces the chance of delays. Your broker can review the contract and plans to ensure they meet lender requirements before submission. This is particularly important if the extension involves unusual design elements or materials, as some lenders have restrictions on specific construction types.
If you are refinancing to fund the extension, your current property value will be assessed along with the proposed post-construction value. The lender uses the lower of these two figures when calculating your loan-to-value ratio during construction. Once the extension is complete and valued, you may be able to access additional equity or remove lender's mortgage insurance if your equity position improves. You can explore refinancing options further through Wagstaff Finance's refinancing page.
Choosing between construction finance and a standard home loan for renovations
Not every extension requires construction finance. If the total project cost is relatively low and you have sufficient equity or savings, you may be able to draw on existing equity through a standard home loan top-up or line of credit. This avoids progress inspections, progressive drawing fees, and the need to provide building contracts and council approvals to the lender.
The threshold for when construction finance becomes necessary varies by lender, but generally applies to projects over $50,000 to $100,000 or where the work significantly alters the structure of the property. Smaller internal renovations or cosmetic updates can often be funded through a personal loan or home equity drawdown. Speak with a broker to determine which structure suits your project scope and budget.
Call one of our team or book an appointment at a time that works for you to discuss your extension project and the construction finance options available. We can connect you with lenders who understand the Eagleby market and help you structure the loan to match your build timeline and budget.
Frequently Asked Questions
How does a construction loan differ from a standard home loan for an extension?
Construction loans release funds in stages as the builder completes each phase of work, rather than providing the full amount upfront. You only pay interest on the amount drawn down, not the total approved loan amount, which reduces interest costs during the build.
Do I need council approval before applying for construction finance in Eagleby?
Yes, most lenders require either an approved development application from Logan City Council or confirmation that your extension falls under accepted development. Lenders will not release funds until you provide evidence of council approval and a fixed price building contract.
What is a construction draw schedule?
A draw schedule outlines when funds are released to your builder based on completed stages such as base, frame, lock-up, fixing, and practical completion. Each stage requires a lender inspection before funds are released, which typically takes three to five business days.
Can I get construction finance if I am acting as an owner builder?
Yes, but it is more difficult. Most mainstream lenders do not offer owner builder finance due to higher risk, so you will need to approach specialist lenders who typically charge higher interest rates and require detailed invoices for each drawdown.
How long do I have to start construction after loan approval?
Most lenders require construction to commence within six to twelve months from the loan disclosure date. If building has not started within this period, your approval may lapse and you will need to reapply.
