Construction Loans: A Guide to Building Project Funding

Building a custom home on the Sunshine Coast gives you control over design, layout, and quality, but the funding structure works differently to a standard home loan.

Construction finance releases funds in stages as your build progresses, which means you only pay interest on the amount drawn down at each stage rather than the full loan amount from day one. Understanding how progressive drawdowns work, what triggers each payment, and how interest accrues during construction will help you budget accurately and avoid surprises when invoices arrive.

How Construction Loans Release Funds During Your Build

Construction loans release funds in instalments that align with specific stages of your build, typically five to six drawdowns from slab pour through to final completion. Your lender appoints a quantity surveyor or building inspector to verify each stage is complete before releasing the next payment, which protects you from paying for work that hasn't been done and gives the lender confidence their security is progressing as planned.

Consider someone building a four-bedroom home in Buderim with a fixed price building contract of $680,000. Their first drawdown of around $136,000 releases after the slab is poured and passes inspection. The second payment releases when the frame is up and the roof is on, usually another $136,000. Plumbing, electrical rough-in, and internal wall framing trigger the third stage. Lock-up, which includes windows, doors, and external cladding complete, releases the fourth payment. The fifth stage covers internal fit-out including kitchen, bathrooms, flooring, and painting. The final drawdown releases after the handover inspection confirms everything meets the building contract specifications and council provides practical completion.

Between slab pour and handover, this buyer pays interest only on the funds released so far. After the first drawdown, they're paying interest on roughly $136,000 rather than the full $680,000, which keeps repayments lower during the construction period when many buyers are still paying rent or covering their existing mortgage.

Interest Charges During Construction and How They're Calculated

You pay interest only on the amount drawn down at each stage, calculated daily and charged monthly. Most lenders offer interest-only repayment options during construction, which means you're not paying down any principal until the build completes and the loan converts to a standard mortgage.

Using the Buderim example above, after three stages are complete and $408,000 has been drawn, the monthly interest charge at a construction loan interest rate of around 6.5% would be approximately $2,210. Once the final drawdown releases the full $680,000, the monthly interest jumps to around $3,683 until the loan converts to principal and interest repayments. Some lenders capitalise the interest during construction, adding it to the loan balance rather than requiring monthly payments, which can help with cash flow if you're paying rent elsewhere but increases your final loan amount.

What Triggers Payment to Your Builder and Who Approves It

Payment releases when your lender's inspector confirms the current stage matches the progress payment schedule in your fixed price building contract. The inspection usually happens within a few business days of your builder submitting a drawdown request, and funds typically arrive in the builder's account within a week of approval.

Your builder submits a claim through the lender's online portal or directly to the construction team, including photos and a brief description of completed work. The inspector visits the site, checks the work against the stage description, and either approves the full amount, requests minor rectifications before releasing funds, or in rare cases flags a significant variation from the approved plans that needs resolution before payment proceeds.

This process protects you from paying ahead of actual progress. In our experience working with clients building across the Sunshine Coast, disputes about payment timing usually come down to differing interpretations of what defines a completed stage. Your building contract should define each stage precisely, including which fixtures and finishes must be installed and whether services like plumbing and electrical need to be tested or just installed.

How Land and Construction Packages Change the Funding Structure

When you're buying a house and land package or purchasing suitable land separately before building, your construction finance needs to cover both the land purchase and the building costs. Most lenders structure this as two facilities under one approval: the land component settles as a standard mortgage, and the construction facility remains undrawn until you commence building within a set period from the disclosure date, usually six to twelve months.

Someone purchasing a 600-square-metre block in Mountain Creek for $420,000 and building a project home for $560,000 would need total funding of $980,000. The land component of $420,000 settles at purchase, with the buyer immediately paying interest on that amount. The $560,000 construction facility doesn't draw until the first building stage, but the buyer needs to service interest on the land loan while finalising their council plans, obtaining council approval, and waiting for the registered builder to start work.

This means carrying interest costs on the land for three to six months before construction starts, plus the ongoing land loan interest during the eight to twelve month build period. Accurate cash flow planning matters because you're servicing a growing loan balance while potentially covering accommodation costs elsewhere.

Progressive Drawing Fees and Other Construction Loan Costs

Lenders charge a progressive drawing fee each time they release funds, typically $300 to $500 per drawdown, which covers the cost of the progress inspection and administration. With five or six drawdowns across your build, expect $1,500 to $3,000 in fees beyond the standard application and settlement costs.

Some lenders bundle these into a single upfront fee, others charge per drawdown, and a few waive them entirely as part of their construction loan product. The fee structure matters less than the total cost across all drawdowns and how it compares between lenders when you're evaluating construction loan options during the application stage.

Beyond drawdown fees, construction lending typically carries similar establishment costs to standard mortgages: application fees, valuation costs, and legal fees for settlement. The valuation often costs more because the valuer needs to assess both the land value and provide a completion value based on your building contract and council-approved plans.

When Owner Builder Finance Works and When It Doesn't

Owner builder finance allows you to act as your own builder, engaging sub-contractors directly and managing the construction process yourself. Fewer lenders offer owner builder finance, and those that do typically require larger deposits, charge higher interest rates, and impose stricter conditions on drawdowns because the lender carries more risk without a licensed builder providing warranties and supervision.

Lenders offering owner builder facilities usually require evidence of building experience, detailed cost breakdowns showing how you'll pay sub-contractors, proof that you've obtained all required permits and approvals, and often a quantity surveyor's report confirming your budget aligns with the scope of work. They'll also want to see fixed price contracts with each trade rather than cost plus arrangements where final costs remain uncertain.

The interest rate premium for owner builder construction funding typically adds 0.5% to 1% compared to standard construction loans, and the deposit requirement often increases to 20% or higher. Unless you have genuine building project management experience and can demonstrate a realistic budget with contracted trades, most mortgage brokers will suggest working with a registered builder under a fixed price building contract to access better loan terms and keep the project moving smoothly.

Converting from Construction to Permanent Loan

Once your build reaches practical completion and you receive the final occupancy certificate from council, your construction facility automatically converts to a standard home loan with principal and interest repayments replacing the interest-only payments you made during the build. This conversion happens without needing a new application or additional approval, though some lenders require a final valuation to confirm the completed property value matches their initial assessment.

The conversion usually takes effect on your next repayment date after completion is confirmed. Your monthly payment will increase significantly because you're now paying down the principal loan balance over the remaining loan term, typically 29 to 29.5 years if you started with a 30-year approval. Someone who paid $2,800 monthly in interest-only payments during construction might see that jump to $5,200 for principal and interest repayments once the loan converts, depending on their rate and final loan amount.

Planning for this payment increase matters, particularly if your income or circumstances changed during the build period. Most lenders assess your borrowing capacity at application based on the final principal and interest repayment, so you've already been approved for that amount, but confirming you can comfortably manage the higher payment once construction completes prevents stress at conversion.

Building on the Sunshine Coast, whether you're looking at acreage properties in the hinterland around Maleny and Montville or residential blocks closer to the coast in Maroochydore and Mooloolaba, requires matching your finance structure to your specific building contract and site conditions. Off the plan finance works differently again if you're buying into a developer's project rather than managing your own build.

Call one of our team or book an appointment at a time that works for you to discuss how construction funding applies to your building project and what you'll need to support your construction loan application.

Frequently Asked Questions