What are the Risks of Construction Loans?

Construction loans fund your build progressively as work completes, which means your financial exposure changes throughout the project. Cost overruns, builder delays, and income reassessments during construction create risk layers that don't exist with established property purchases.

Cost Overruns and Contract Structure

Your contract type determines how much financial risk you carry when costs exceed the original quote. Under a fixed price building contract, the builder absorbs most cost increases unless you request variations. Under a cost plus contract, you pay the actual costs plus a builder's margin, which means material price increases and labour blowouts flow directly to you.

Consider a professional running a consultancy who signs a cost plus contract for a custom design in a coastal area. Timber frame costs increase 12% during construction due to supply issues, and wet weather adds three weeks to the build schedule. The additional materials and extended site supervision fees add $38,000 to the final cost. If borrowing capacity was calculated at the original quote, the lender may not approve additional funds without reassessing income, which becomes complex when business income fluctuates seasonally.

Most lenders assess your loan application based on the contract price plus a contingency buffer, typically 5% to 10%. If actual costs exceed that buffer, you'll need to cover the difference from savings or request a loan increase mid-project. That request triggers a fresh income assessment using your most recent financial statements, which can be problematic if your business has had a quieter period since the original approval.

Builder Insolvency and Project Abandonment

If your registered builder becomes insolvent before completing your home, you're left with a partially finished structure and a loan that's already been partially drawn down. You're paying interest on funds that haven't delivered a finished asset, and you'll need to find another builder to complete the work, often at a higher rate than the original contract because they're taking on someone else's half-finished project.

Insurance products exist to cover deposit loss and completion costs in the event of builder insolvency, but they don't cover all scenarios. Home warranty insurance typically covers up to a certain amount per claim and won't reimburse design fees, council approval costs, or your time. The administrative burden of lodging claims, engaging a new builder, and managing contract disputes falls entirely on you while interest continues accruing on funds already drawn.

Income Reassessment at Each Drawdown

Some lenders reassess your income and financial position at each progress payment, particularly for self-employed borrowers or those with commission-based income. If your business income drops between approval and the third or fourth drawdown, the lender can refuse to release further funds even though construction has progressed and you're contractually obligated to pay the builder.

In our experience with self-employed clients, this becomes particularly challenging when construction spans a financial year-end. A tradie building their own home might have strong income in the year they gain approval, but if the next financial year shows reduced turnover due to taking time off for the build or a contract ending, the lender may freeze further drawdowns. You're then forced to find alternative funding, delay construction, or negotiate with the builder while holding costs continue.

Lenders differ significantly in their approach to ongoing assessments. Some approve the full loan amount upfront and release funds based solely on progress inspections. Others require updated financials at each stage. Knowing which approach your lender takes before signing the building contract matters, because it affects your ability to complete the project if your income profile changes during construction.

Extended Settlement Timeframes and Rate Lock Expiry

Construction timelines frequently extend beyond the original estimate due to weather delays, material shortages, council inspection scheduling, or subcontractor availability. If you've locked in a construction loan interest rate at approval, that rate lock typically expires after 90 to 120 days. Once expired, you move to the prevailing rate at each drawdown, which can increase your borrowing costs significantly if rates have risen since approval.

Most construction loans charge interest only on the amount drawn down during the build phase, which keeps repayments lower initially. However, if construction takes 14 months instead of the projected nine, you're paying interest-only for an extended period without the rental return or occupancy benefit you'd have from an established property. The longer the build drags on, the more interest you pay without a finished asset generating value.

Progress payment schedules typically align with building milestones: slab down, frame up, lockup, fixing stage, and practical completion. Each stage requires a progress inspection before the lender releases funds. Inspection delays add days or weeks to each payment cycle, which can leave builders waiting for funds and slow the project further. A Progressive Drawing Fee applies at each release, usually $200 to $400 per drawdown, adding another $1,000 to $2,000 to total project costs depending on how many payment stages your lender requires.

Land Holding Costs During Approval and Construction

If you purchase suitable land separately before construction begins, you're servicing that loan while waiting for council approval and then throughout the build. Development application timeframes vary by council but often take three to six months. During that period, you're paying interest on land that isn't generating any return.

Most lenders require you to commence building within a set period from the Disclosure Date, typically 12 months. If council approval delays push you beyond that timeframe, your construction loan approval may lapse and require reapplication with updated income documentation. For self-employed borrowers, that can mean another full financial assessment at a time when business conditions may have changed.

A land and construction package bundles the land purchase and build funding into one loan structure, which can reduce holding costs slightly but doesn't eliminate the risk of council delays or builder availability pushing out your start date. Some refinancing may be required if the land loan was initially structured as a standalone purchase before construction plans were finalised.

Cash Flow Management for Professional and Self-Employed Borrowers

Progress payment finance requires you to manage cash flow across multiple drawdowns while maintaining your existing living expenses and business operating costs. Unlike a standard home loan where the full amount settles on one date, construction funding releases in stages, which means your repayments increase progressively as each drawdown occurs.

If you're running a professional services business, that incremental repayment structure can clash with your revenue cycle. A consultant with quarterly invoicing might have strong cash flow in some months and tighter periods in others. If a progress payment falls due during a lean month, you need sufficient reserves to cover both the repayment and any out-of-pocket construction costs not covered by the loan.

Interest-only repayment options during construction help manage cash flow, but they don't eliminate the need for liquidity. Unexpected costs like additional site works, upgraded fixtures, or design changes require immediate payment, and lenders rarely approve variations quickly enough to align with builder payment schedules. Having a buffer of at least 10% to 15% of the total build cost in accessible savings reduces the risk of project delays caused by funding gaps.

Valuation Risk at Practical Completion

Your lender commissions a valuation once construction reaches practical completion, and that valuation determines whether the finished property supports the total loan amount drawn. If the valuation comes in below the total funds released, you may face a shortfall that requires immediate repayment or triggers a higher interest rate due to an increased loan-to-value ratio.

Valuation risk increases when you're building a custom design that doesn't align with typical buyer preferences in the area, or when the local market softens during the construction period. A unique architectural build might cost $850,000 to complete but only value at $780,000 if there's limited buyer demand for that style. The $70,000 gap becomes your problem, not the lender's.

This risk is distinct from cost overruns. Even if you complete the build on budget, the finished property might not appraise at a value that reflects your total expenditure. That gap affects your equity position and your ability to access funds for other purposes post-completion.

Call one of our team or book an appointment at a time that works for you. We'll assess your specific circumstances, identify which lenders offer the most suitable construction funding structure for your income type, and work through the risk factors that apply to your build before you commit to a contract.

Frequently Asked Questions