Why Construction Loans Carry Real Risk for Builders

The Risk That Catches Most Borrowers Off Guard

Construction finance works differently to a standard home loan, and that difference creates exposure you won't find with an established property purchase. You borrow against a property that doesn't exist yet, and you're relying on a builder, subcontractors, council approvals, and a construction draw schedule to all align without delay or cost variation. When one of those elements shifts, the loan structure can't shift with it.

In our experience working with WA Government employees, the most common issue involves cost blowouts that weren't factored into the original loan amount. You secure approval based on a fixed price building contract, then halfway through the build the builder identifies variations, site issues, or price increases for materials. If your loan amount was calculated at 90% of the contract price with no buffer, you're now either funding the gap from savings or renegotiating the loan mid-construction.

Consider a buyer who locked in a land and construction package with a registered builder using a fixed price contract for $480,000. Council approval delayed the start by four months, during which time the builder increased the contract price by $22,000 to reflect updated material costs. The buyer had already settled on the land using part of the approved construction loan, and the lender required a new valuation and loan variation to cover the increased build cost. The delay pushed settlement out by six months, and the buyer paid interest-only repayments on the land component while waiting for construction to commence.

Fixed Price Contracts Don't Eliminate Cost Risk

A fixed price building contract sets a total price for the build, but it doesn't lock in every element that affects your final cost. Most contracts include clauses that allow the builder to pass on price increases caused by delays outside their control, changes to council plans, or variations you request mid-build. The contract price is fixed assuming the build proceeds as planned, but construction rarely proceeds exactly as planned.

You'll also pay costs outside the contract itself. These include council approval fees, development application costs, progress inspection fees, and the Progressive Drawing Fee or Progressive Payment Schedule charges from your lender. Many WA lenders charge between $300 and $500 per progress payment, and a typical build involves five to six drawdowns. Over the life of the construction loan, those fees add up.

Cost plus contracts carry higher risk again. Instead of a fixed total, you're paying the builder's costs plus a margin, which means the final price isn't confirmed until the build is complete. Unless you have a significant buffer in your loan amount or substantial cash reserves, a cost plus contract can leave you exposed if the build runs over budget. Most lenders prefer fixed price contracts for this reason, and some won't lend against cost plus arrangements at all.

Interest Compounds While You Wait for Completion

Construction loans only charge interest on the amount drawn down, which sounds like an advantage until you realise you're paying interest on land and partial construction for months before you can move in. During construction, most borrowers are on interest-only repayment options, which means the loan balance isn't reducing while you're also covering rent or your current housing costs.

If the build takes longer than expected, those holding costs extend. A build scheduled for six months that runs to nine months means an additional three months of interest-only payments on the drawn amount, plus three months of rent or mortgage payments on your current property if you haven't sold yet. The cost difference isn't always obvious upfront, but it affects your cash flow and your ability to meet progress payment finance requirements as each stage completes.

Lenders calculate serviceability based on the full loan amount, not just the amount drawn down at any point during construction. That means you need to demonstrate you can afford repayments on the entire construction loan from the date of approval, even though you won't draw the full amount until the build is finished. For WA Government employees, stable employment helps with serviceability, but it doesn't reduce the cash flow pressure during the construction phase itself.

Builder Insolvency and Delayed Completion

If your registered builder becomes insolvent mid-construction, your loan is still secured against the land and the incomplete build, but you're left without a builder to finish the work. You'll need to engage another builder to complete the project, and the new builder will usually charge more than the remaining contract value because they're taking on someone else's half-finished work. The original lender may not increase the loan amount to cover the additional cost, which leaves you funding the difference or walking away from a partially built property.

Most states require builders to hold construction insurance that covers incomplete work if the builder fails, but the insurance often doesn't cover the full cost of completion or delays in settling the loan. You're also dealing with the time it takes to assess the incomplete work, engage a new builder, and restart construction. During that period, you're still paying interest on the amount already drawn down, and your construction loan approval may expire before the build is finished.

In a scenario like this, a buyer in the Perth metro area had drawn down $260,000 across three progress payments when the builder went into administration. The incomplete build was assessed at 60% completion, and the buyer needed another $140,000 to finish the project. The original loan was approved for $420,000, which left a $20,000 gap after accounting for the remaining funds. The buyer refinanced the land and incomplete structure, then took out a separate construction loan with a new builder to complete the work. The entire process added nine months to the original timeline and cost an additional $18,000 in interest and fees.

Council Approval Delays and Contract Conditions

Most construction loans require you to commence building within a set period from the Disclosure Date, often six to twelve months. If council approval or development application processes delay the start, your loan approval may expire before construction begins. You'll need to reapply, which means another credit check, updated income verification, and potentially a new valuation if property values have shifted.

Council plans and approvals also affect the draw schedule. Lenders release funds based on a progress payment schedule tied to construction milestones, but those milestones can't be reached until council inspections are completed. If council inspections are delayed or if the build doesn't meet code at a particular stage, the next drawdown is held until the issue is resolved. That delay can leave you without funds to pay sub-contractors like plumbers or electricians, which in turn delays the next stage of construction.

Some buyers assume they can lock in a construction loan interest rate at the time of approval and hold that rate through the entire build. Most lenders don't offer that option. The rate is set when each drawdown occurs, not when the loan is approved. If rates increase during construction, your borrowing cost increases as well. You're also exposed to valuation risk at completion. If the finished property is valued below the total loan amount when you convert from construction to permanent loan, the lender may require you to reduce the balance or pay Lenders Mortgage Insurance on a higher ratio than you planned.

Owner Builder Finance and Renovation Loan Challenges

Owner builder finance carries stricter lending criteria because you're managing the build yourself rather than using a registered builder. Most lenders either don't offer owner builder finance at all, or they cap the loan-to-value ratio at 60% to 70% and require detailed project plans, fixed quotes from sub-contractors, and evidence of construction experience. The progressive drawdown process is also more involved, with lenders requiring progress inspections at each stage before releasing funds.

If you're using a house renovation loan or home improvement loan to extend or renovate rather than build new, the same principles apply. You're drawing down in instalments based on completion of specific stages, and delays or cost variations affect the timeline and your cash flow. Renovation finance often involves living in the property during works, which creates additional pressure if the project runs over time or if you need to move out mid-renovation due to safety or council requirements.

Public Home Loans works with WA Government employees to structure construction loans for public servants that account for income stability and sector-specific lending policies. We also assess whether a house and land package loan or a separate land and build loan offers more flexibility depending on your deposit size and the stage of the project.

Managing Risk Through Loan Structure and Contingency

The most effective way to manage construction loan risk is to build a financial buffer into your loan amount and your savings before you start. That buffer should cover at least 10% of the contract price to account for variations, plus three to six months of holding costs if the build is delayed. If your loan is approved at exactly the contract price with no margin, you're assuming the build will finish on time and on budget, which is not a reliable assumption.

You should also clarify the progress payment schedule with your lender and your builder before signing the contract. Make sure the builder's progress claims align with the lender's drawdown stages, and confirm who is responsible for progress inspection costs. Some lenders deduct inspection fees from each drawdown, others charge them separately. If you're not clear on the schedule, you can end up with a gap between when the builder expects payment and when the lender releases funds.

Fixed rate options are limited during construction because you're drawing down in stages rather than receiving a lump sum. Most borrowers stay on a variable rate during the build, then consider fixing part or all of the loan once they convert to a standard home loan at completion. If you're concerned about rate movements during construction, discuss split loan options with your broker so you can fix a portion of the loan as each drawdown occurs, though not all lenders offer that structure.

If you're planning to build a custom design or spec home, make sure your construction loan application includes updated council plans and a detailed cost breakdown from the builder. Lenders assess the project based on the information provided at application, and incomplete or outdated plans can lead to approval delays or conditions that slow down the first drawdown. The same applies to project home loans and custom home finance. The more detail you provide upfront, the fewer issues you'll encounter once construction starts.

For WA Government employees considering a build, Public Home Loans can access construction loan options from banks and lenders across Australia, including those that offer progress payment finance with lower fees or more flexible drawdown schedules. We also work with buyers using low deposit loans or no LMI loans to structure the land purchase and construction phases in a way that minimises upfront cost without creating serviceability issues later.

Construction finance requires more active management than a standard loan, and the risks are different. You're not just borrowing to buy a property, you're funding a project that depends on third parties, approvals, and conditions you don't fully control. Understanding those risks before you sign a building contract means you can structure your loan and your savings to handle delays and variations without derailing the entire project.

Call one of our team or book an appointment at a time that works for you. We'll assess your build plans, review the contract, and structure a construction loan that accounts for the specific risks in your project and your capacity to manage them through to settlement.

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