Construction Loan Structures & How Drawdowns Work

Building a custom home in Patterson Lakes means understanding how construction finance actually flows.

Unlike a standard mortgage where you receive the full loan amount at settlement, construction funding is released progressively as your build reaches specific stages. The structure you choose determines when your builder gets paid, how much interest you'll pay during construction, and whether your lender will even approve the project.

Progressive Drawdown: The Foundation of Construction Finance

Most construction loans release funds in five to seven instalments aligned with major building milestones. Your lender only charges interest on the amount drawn down at each stage, not the full approved loan amount.

Consider someone building a $650,000 home on land they already own in Patterson Lakes. After the first drawdown of 10% for base stage completion, they're paying interest on approximately $65,000 while the remaining $585,000 stays undrawn. By frame stage at around 30%, interest applies to roughly $195,000. This staged release means you're not carrying the full interest burden from day one, but it also means your builder must coordinate their cash flow around your lender's inspection and approval process.

Lenders typically require a progress inspection by a qualified valuer before releasing each payment. The inspection confirms that the work claimed by your builder has actually been completed to the required standard. This adds three to five business days between your builder requesting payment and funds actually landing in their account. Builders who regularly work with owner-occupiers in waterfront areas like Patterson Lakes understand this timing, but it's worth confirming during your building contract negotiation that the payment schedule allows for lender inspections.

Fixed Price Building Contracts vs Cost Plus Arrangements

Your building contract type directly influences which lenders will consider your construction loan application and what interest rate you'll receive.

Under a fixed price building contract, your builder commits to completing the project for an agreed sum regardless of cost variations. This gives lenders certainty about the final loan amount and makes approval more straightforward. Most major banks will only approve construction finance when a fixed price contract is in place with a registered builder.

Cost plus contracts, where you pay the actual construction costs plus a builder's margin, create uncertainty for lenders. If materials or labour costs increase mid-build, the final loan amount could exceed what was initially approved. Some lenders refuse cost plus arrangements entirely. Others will consider them but require larger deposits, charge higher interest rates, and often cap the build period to six or nine months rather than the standard twelve.

Owner builder finance sits in a separate category again. Because you're acting as your own builder and managing trades directly, lenders consider this significantly higher risk. Fewer lenders offer owner builder finance, deposits of 20% to 30% are standard, and the progressive drawdown schedule is often more conservative with additional inspections required before releasing funds to pay sub-contractors like plumbers and electricians.

Land and Construction Packages: Single Approval, Two Settlement Dates

When you're purchasing both land and building simultaneously through a land and construction package, the loan structure splits into two distinct phases within a single approval.

The land component settles first as a standard property purchase. You begin making principal and interest repayments on this portion immediately. The construction component remains undrawn until building commences, with no repayments due until the first drawdown.

In a scenario where someone is purchasing a $450,000 block in one of the Patterson Lakes estates near Bicentennial Park with a $550,000 build, they'd settle on the land first and begin repaying roughly $2,200 monthly on that portion at current variable rates. Once building starts and the first construction drawdown occurs, they'd switch to interest-only repayment options on both components until the build completes. This prevents them from making full principal and interest payments on the total $1 million while also covering rent or their existing housing costs during the construction period.

Most lenders require you to commence building within a set period from the disclosure date, typically six to twelve months after land settlement. This protects the lender from significant property value changes and ensures the project moves forward as planned. If you're purchasing land with the intention to build but want more time to finalise plans or wait for council approval, confirm the commencement timeframe with your lender before committing to the package.

Construction Draw Schedules and Builder Payment Timing

The progress payment schedule in your building contract must align with your lender's approved drawdown structure.

Standard construction draw schedules typically include base or slab stage, frame stage, lock-up stage, fixing stage, and practical completion. Some lenders use five stages, others use seven. The percentage released at each stage varies between lenders, but most follow a similar pattern with smaller amounts early and larger releases toward completion.

Your builder's contract will specify when they expect payment for each stage. If your builder requires payment within five business days of completion but your lender needs a week for inspection and approval, you've created a timing gap that could delay your build. When reviewing a fixed price building contract, confirm that the progress payment schedule includes allowance for lender inspections and fund transfer time.

Some lenders charge a progressive drawing fee for each inspection and drawdown, typically $250 to $400 per stage. Across seven drawdowns, this adds $1,750 to $2,800 to your total construction costs. Other lenders include this in their loan establishment fee. When comparing construction finance options, factor these fees into your total borrowing costs rather than focusing solely on the interest rate.

Interest-Only Repayments During Construction and Beyond

Most construction loans automatically convert to interest-only repayment during the build period, then offer the option to continue interest-only for up to five years after completion.

During construction, you're only paying interest on drawn funds. Once the build completes and the loan converts to standard mortgage terms, you can typically choose between principal and interest or interest-only repayments. For owner-occupiers building their forever home in Patterson Lakes, switching to principal and interest after moving in makes sense. For investors or those planning to renovate and upgrade again in a few years, maintaining interest-only repayments for a period can preserve cash flow.

Some lenders offer construction to permanent loan structures where the construction phase and permanent mortgage are approved together upfront. This removes the need to reapply once the build completes and can lock in your ongoing interest rate before construction even starts. Other lenders treat construction and permanent phases separately, requiring a new assessment at completion. The first option provides more certainty, particularly if your employment or financial circumstances might change during the build period.

Getting Your Council Plans and Development Application Approved First

Lenders will not release construction funds until you have council approval and all required permits in place.

Your building loan approval is conditional on providing stamped council plans and evidence that your development application has been approved. If your custom design includes features that require planning permits beyond standard building approval, factor in three to six months for the council process before you can break ground.

For residents in Patterson Lakes working with architects on custom designs that take advantage of water views or corner blocks, this approval timing matters. The clock on your land and build loan's commencement period starts at land settlement, not when council finally approves your plans. If council approval takes longer than expected, you could be forced to either commence with modified plans or risk your construction finance approval lapsing.

Making additional payments during construction isn't always straightforward. Because the loan hasn't fully drawn down yet, lenders treat additional payments differently than on a standard mortgage. Some allow you to pay down drawn amounts, reducing your interest during construction. Others don't accept additional payments until after practical completion when the loan converts to permanent terms. If you're expecting a bonus or tax return during your build and want to reduce the balance early, confirm your lender's policy before assuming you can.

Access to construction loan options from banks and lenders across Australia varies significantly based on your builder, contract type, and deposit size. What works for a volume builder in a master-planned estate may not suit someone building a custom home with a boutique builder. The structure that minimises interest costs might not be the structure that gives your builder the cash flow certainty they need to deliver on time.

Call one of our team or book an appointment at a time that works for you. We'll review your building contract, connect you with lenders who specialise in the type of construction you're planning, and structure your drawdown schedule to match both your financial position and your builder's requirements.

Frequently Asked Questions