Common Mistakes When Choosing Construction Loan Features

Choosing a Construction Loan That Only Charges Interest on Drawn Amounts

You pay interest only on the funds released at each stage, not the full loan amount upfront. This means if you have approval for $450,000 but only $120,000 has been drawn down for slab and frame, your interest charges apply to that $120,000 until the next progress payment is made.

Consider a buyer building in Baldivis who secured a construction to permanent loan with a registered builder on a fixed price building contract. At the first drawdown for base stage completion, $95,000 was released. Rather than paying interest on the entire $420,000 loan amount, repayments for the first eight weeks covered only the drawn portion. By the time the frame and roof were complete and another $140,000 was released, the borrower had saved approximately $2,800 in interest compared to a loan structure that charged on the full amount from day one.

Most lenders structure construction loans this way, but the interest rate applied to those drawn amounts varies. Some lenders offer the same variable rate as their standard home loan product, while others add a margin during the construction phase. Knowing whether your rate adjusts after completion is part of understanding how the loan transitions from construction funding to a standard mortgage.

Understanding the Progressive Payment Schedule and Inspection Process

Progress payments are released in stages based on construction milestones, not calendar dates. A typical schedule includes base stage, frame stage, lock-up stage, fixing stage, and practical completion. Your lender arranges a progress inspection before releasing each payment to confirm the work matches the stage claimed by your builder.

The inspection is conducted by a qualified valuer or building consultant who visits the site, photographs the progress, and provides a report to the lender. If the work doesn't meet the required stage, the drawdown is delayed until the builder rectifies the issue. This protects you from paying for work that hasn't been completed, but it also means your builder may need to wait longer for payment if there are defects or incomplete tasks.

In practice, most builders factor these inspection timelines into their cash flow planning. Delays typically occur when a builder requests a drawdown prematurely or when council approval for certain stages hasn't been finalised. Asking your builder upfront how they manage progress payment timing and whether they've worked with your lender before can prevent misalignment during the build.

Fixed Price Contracts Versus Cost Plus Agreements

A fixed price contract sets a total build cost upfront, while a cost plus contract charges actual costs plus a builder's margin. Fixed price contracts give you certainty over the loan amount you'll need, which makes construction loan application more predictable and reduces the risk of requiring additional funds mid-build.

With a cost plus contract, you're exposed to cost variations if materials increase in price or if subcontractors charge more than anticipated. Lenders are more cautious with cost plus arrangements because the final loan amount isn't locked in. Some will only lend up to a percentage of the estimated build cost, leaving you to cover overruns from savings or alternative funding.

For owner builder finance, cost plus is more common because you're managing subcontractors directly and can't provide a single contracted price. Lenders treating owner builder applications typically require detailed costings from plumbers, electricians, and other trades, along with evidence of your building experience or qualifications. The approval process takes longer, and loan amounts are generally capped at 80% of the combined land and construction value.

Land and Construction Package Versus Separate Land Purchase

Buying land and arranging construction finance as a single package means one loan covers both components, and you start paying interest on the land portion immediately. If you already own suitable land, your construction funding only needs to cover the build, which reduces the total loan amount and may improve your borrowing capacity.

When the land is purchased separately before applying for the construction loan, lenders assess the current market value of that land as part of your deposit. If you bought a block in Mandurah two years ago for $180,000 and it's now valued at $210,000, that $30,000 increase contributes to your equity position and can reduce the amount you need to borrow for the build.

Timing matters if you're required to commence building within a set period from the disclosure date. Some land developers include sunset clauses that require construction to start within 12 or 18 months. If you're not ready to build immediately, holding the land without construction approval can mean paying interest on a parcel you're not yet using, or facing penalties if the development contract lapses.

Progressive Drawing Fees and How They Add Up

Lenders charge a progressive drawing fee each time funds are released, typically between $200 and $400 per drawdown. With five or six stages in a standard build, these fees can total $1,500 to $2,400 across the construction period.

Some lenders cap the number of drawdowns included in the loan package, then charge additional fees if your builder requests more stages. This can happen with custom home finance where the build is more complex or staged differently to a project home. Asking your lender upfront how many drawdowns are included, and whether additional payments attract extra fees, prevents surprises when your builder submits the progress payment finance request.

A few lenders waive progressive drawing fees as part of promotional offers, but these are usually tied to specific loan products or minimum borrowing thresholds. Comparing the total fee structure, not just the construction loan interest rate, gives you a clearer picture of what the build will cost in financing terms.

Interest-Only Repayment Options During Construction

Most construction loans default to interest-only repayments during the build, switching to principal and interest once construction is complete. This keeps your repayments lower while funds are being drawn down progressively and you're often still paying rent or a mortgage elsewhere.

Once the build reaches practical completion and the final drawdown is made, the loan converts to a standard mortgage with principal and interest repayments calculated over the remaining term. If you took out a 30-year loan and the build took seven months, you'll repay principal and interest over 29 years and five months from that conversion date.

Some borrowers choose to make additional payments during construction to reduce the balance before the loan converts, particularly if they've sold a previous property or received other funds. Checking whether your construction to permanent loan allows extra repayments without penalty during the build phase gives you flexibility if your circumstances change.

When Council Approval Delays Affect Drawdown Timing

Your builder can't start on site until council plans are approved and a building permit is issued. If there are delays in the development application or if council requests changes to the design, the start date shifts and your construction funding sits unused.

Lenders typically allow 12 months from loan approval to first drawdown, but if council approval takes longer, you may need to reapply or extend the approval period. Borrowing capacity can change in that time if interest rates rise or if your employment circumstances shift, which means the loan amount you were originally approved for might no longer be available at the same terms.

If you're building in an area with heritage overlays, bushfire zones, or other planning restrictions common across parts of WA, factor in longer approval times when scheduling your build. Your broker can help structure the loan application timeline to align with realistic council processing periods rather than optimistic builder estimates.

How the Loan Converts After Practical Completion

Practical completion is the point where the build is finished, all defects are rectified, and you receive the keys. The lender conducts a final inspection, confirms the property value matches the loan amount, and converts the construction funding to a standard home loan.

At conversion, your repayments increase because you're now paying principal and interest on the full loan amount rather than interest only on progressive drawdowns. If you were paying $950 per month in interest during construction, that might jump to $2,400 per month once the loan converts, depending on the loan amount and interest rate at the time.

Some lenders offer a rate discount at conversion or allow you to lock in a fixed rate for part of the balance. Discussing your options a few months before practical completion gives you time to compare whether staying with your current lender or refinancing to a different product suits your circumstances once the build is done.

If you're ready to move forward with building your new home, call one of our team or book an appointment at a time that works for you. We'll walk through which lenders offer the features that match your build type, your timeline, and your budget.

Frequently Asked Questions