Simple hacks to avoid construction loan traps

Construction finance works differently to a standard home loan, and those differences create risk.

You borrow against something that doesn't exist yet, money is released in stages based on progress, and delays or disputes can freeze funding at the exact moment you need it most. For anyone building in Queensland, understanding where those risks sit and how to manage them is the difference between a build that completes on budget and one that stalls halfway through.

Why construction loans carry more risk than standard home loans

A construction loan releases funds progressively as your build reaches certain milestones, rather than handing over the full loan amount at settlement. That means the lender is relying on the builder, the contract, and council approvals to protect their security. If any of those break down, the funding can stop even though you're legally obligated to pay the builder. You're also paying interest on the amount drawn down so far, while trying to cover rent or a mortgage elsewhere, which creates cash flow pressure that doesn't exist with a standard purchase.

Consider a buyer building a custom home in the Somerset Region who secures a land and construction package with a registered builder. The first draw releases funds for the slab, but the second draw is delayed because the building surveyor flags non-compliance with council plans. The builder stops work until the issue is resolved, but the buyer is still covering interest on the amount already drawn down, plus rent on their current property. The lender won't release the next stage of construction funding until the compliance issue is fixed, and the buyer has no control over how quickly that happens.

Fixed price contracts reduce your exposure to cost overruns

A fixed price building contract locks in the build cost at the start, so you know exactly what you're borrowing and the builder carries the risk if materials or labour costs increase during construction. That's the opposite of a cost plus contract, where you pay the builder's actual costs plus a margin, meaning your loan amount can climb if the build runs over budget. Most lenders in Australia will only approve construction finance if you have a fixed price contract with a registered builder, because it limits their exposure and yours.

Without a fixed price agreement, you're vulnerable to price variation clauses that let the builder increase the contract sum if certain conditions are met. Those clauses are common in cost plus arrangements and can add tens of thousands of dollars to a project, forcing you to find additional savings or apply for a loan top-up partway through the build.

Progress payment disputes can freeze your build

Construction funding is released according to a progress payment schedule, which is usually tied to physical stages such as base, frame, lock-up, fixing and completion. Each stage requires a progress inspection by the lender's valuer or surveyor before funds are released. If the builder claims a stage is complete but the inspection finds it's not, or if there's a dispute over the quality of work, the lender will hold the payment until the issue is resolved. That can stop the build entirely, because most builders won't continue without being paid for the work they've already done.

In our experience, disputes most often arise at lock-up and fixing stages, where subjective judgments about completion come into play. A builder might argue that lock-up is reached because the roof is on and windows are in, but the valuer might disagree because external doors aren't fitted or the building isn't secure. The contract should define each stage clearly, but if it doesn't, you're relying on the lender's valuer to interpret it, and that interpretation might not align with the builder's expectations.

Why time limits in loan approvals matter

Most construction loan approvals require you to commence building within a set period from the disclosure date, usually six to twelve months. If you don't start within that window, the approval lapses and you'll need to reapply, which means a new credit assessment, updated valuations, and potentially different interest rates or lending criteria. That creates risk if your development application or council approval takes longer than expected, or if the builder's schedule pushes your start date beyond the approval window.

We regularly see this in Queensland where council approval timelines vary significantly depending on the local government area and the complexity of the build. A straightforward project home on suitable land in an established area might get approval in six to eight weeks, but a custom design on acreage in the Somerset Region can take four to six months, particularly if the plans involve bushfire management overlays, environmental assessments or non-standard road access. If your loan approval expires before council signs off, you're back to square one.

How to structure your deposit and buffer

Lenders assess construction finance based on the combined value of the land and the completed build, but they'll also want to see that you have enough cash to cover the deposit, settlement costs, and a buffer for unexpected expenses. That buffer is critical, because construction projects almost always run over time or over budget in some way. Plumbers, electricians and other sub-contractors might charge more than the builder originally estimated, or site conditions might require additional earthworks that weren't in the original quote.

A sensible buffer is five to ten percent of the total build cost, held in accessible savings rather than tied up in offset accounts or redraw facilities that the lender might not count as genuine savings. If you're building in a rural area like Kilcoy or Woolmar where builders are less common and may charge a premium for travel and logistics, that buffer becomes even more important.

What happens if the builder walks off site

If your builder goes into liquidation or abandons the project, your construction loan doesn't disappear. You still owe the lender for every dollar that's been drawn down, but you don't have a completed house to show for it. The lender's security is the land plus whatever's been built so far, and in most cases that's worth significantly less than the amount you've borrowed. You'll need to find a new builder to complete the work, but the original contract is void, so the new builder will want to be paid for finishing someone else's job, and most lenders won't increase your loan amount to cover that cost.

This is where building insurance and owner builder finance diverge. If you're using a registered builder, Queensland's building insurance scheme offers some protection if the builder becomes insolvent, but the payout is capped and the claims process can take months. If you're acting as an owner builder, you carry the entire risk yourself, and most lenders won't offer owner builder finance unless you can demonstrate trade qualifications and experience managing construction projects.

The difference between progress payment finance and interest-only repayment options

During construction, you're only charged interest on the amount drawn down so far, not the full loan amount. That's because the lender hasn't released the full loan yet. Once the build is complete and the final draw is made, the loan converts to a standard home loan with principal and interest repayments, unless you've specifically arranged interest-only repayment options for an agreed period. Some lenders will let you make additional payments during the construction phase to reduce the loan balance early, but others lock you into interest-only until the loan converts.

You'll also pay a progressive drawing fee or progressive drawdown fee each time the lender releases funds, typically between $300 and $500 per draw depending on the lender. That fee covers the cost of the progress inspection and the administration of releasing the payment. Over a five or six stage build, those fees add up to a few thousand dollars, and they're usually deducted from the draw amount rather than charged separately, so you need to factor them into your cash flow.

Somerset Finance works with lenders across Australia who offer construction finance with different fee structures, draw schedules and repayment options. If you're planning to build a new home in Queensland and want to understand which structure suits your situation, call one of our team or book an appointment at a time that works for you.

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