Fixed-price construction contracts: Can rising costs change your next loan?
Fixed-price construction contracts can keep a builder busy long after the original profit forecast has stopped reflecting the cost of the work.
The order book is full. Site teams have months of work ahead, and the business is considering its next move: premises, another piece of equipment or funding to take on a larger job.
Then the latest supplier prices and subcontractor quotes land.
Concrete, framing and labour now cost more than they did when the contracts were signed. The projects are still going ahead, but the money expected to remain at the end is shrinking.
For an Australian builder seeking another loan, that is the story the finance application needs to tell. An earnings projection prepared at the tender stage may no longer describe what the business can afford today. Recognising the change early gives the owner and advisers something more useful to work with than an impressive sales total.
The short answer
Reforecast significant building contracts using current costs to complete.
Show what the revised margins leave after business overheads.
Separate approved variations from unresolved claims.
Follow stage payments alongside wages, trades and supplier commitments.
Test the next loan against the updated position and realistic delays.
Fixed-price construction contracts: A full programme can conceal a thinner margin
The contract price is agreed. The costs of delivering the building can still move.
A project signed months earlier may have excavation, structural materials, roofing and finishing trades ahead of it. If the start date slips, supplier quotes used in the estimate may expire before the orders are placed. Site supervision and equipment hire can also run longer than planned.
The QBCC's guidance for builders, reviewed in October 2026, identifies rising costs, reduced margins and delays as risks under fixed-price agreements. It also emphasises reviewing the contract and documenting changes. Its Queensland context should not be treated as a statement of every state's requirements.
Being busy does not make those changes disappear. They need to find their way into the forecast before the original margin becomes the basis for another financial commitment.
Last year's accounts can be accurate and still leave today's question unanswered
A profitable year is useful evidence. It does not settle what the current building programme is expected to earn.
Perhaps last year's jobs were priced under different conditions. Perhaps this year's contracts were signed before several trade packages became more expensive. Applying the earlier margin to the new order book can make the future look stronger than the current project information supports.
The government's business-loan application guidance starts with income, expenses, debts and cash flow. For a builder, a current contract-by-contract forecast helps connect that information to the money expected to service another loan.
The question becomes more concrete: after finishing the work already promised and meeting the business's other costs, what is left for repayments?
Three building contracts, one changed earnings picture
Consider an original hypothetical building company with three fixed-price new-build contracts totalling $3 million, excluding GST. At the outset, direct building costs were budgeted at $2.4 million.
That left $600,000 to cover business overheads, finance costs, tax and profit.
An updated review puts total direct costs at $2.7 million, with no additional client revenue approved. The contribution before those other costs falls to $300,000. The signed contract value is still $3 million.
If overheads for the same period are $220,000, the amount left before finance costs and tax falls from $380,000 to $80,000.
The business has the same contracts and a very different starting point for the next loan discussion.
These assumptions are illustrative, not typical building margins or a borrowing-capacity calculation. Their purpose is to show how changed delivery costs can undermine an older earnings projection even while the programme remains full.
The estimate needs to catch up with the site
The people delivering the build may see a problem before it becomes obvious in the monthly accounts. An outstanding trade package costs more. A quote has expired. A programme extension means another period of hire and supervision.
Those changes are easier to assess when the estimator, site supervisors and accountant are working from the same information.
A useful review separates costs already incurred, committed purchases and the further spending needed to finish. That prevents an unpaid purchase order from disappearing from the estimate, or a cost already recorded from being counted twice.
For each substantial job, the remaining allowances should reflect outstanding trades, materials, equipment hire, site costs and defects work. Signed prices and current quotes provide different levels of certainty from provisional estimates. Availability matters too, because an agreed price does not guarantee a trade can attend when needed.
The guide to working-capital evidence from contracts and forecasts helps organise that supporting material. Dating the review makes later changes easier to explain when the finance adviser asks what has moved since the application began.
The variation you hope to recover is not yet money in the account
Additional excavation, a design change or a delay may create a claim for more money. Whether that claim can be recovered, at what amount and when are questions that need their own answers.
A cost increase does not automatically create a right to charge the client more. The ACCC's contracts guidance explains the importance of understanding contractual obligations. Your solicitor can advise on the actual price-adjustment, variation and delay provisions.
The government's contract-preparation guidance also discusses documenting variations. In the forecast, approved amounts should be distinguishable from submitted claims, disputed figures and hoped-for recoveries.
That distinction gives the lending conversation more substance. Your accountant can determine the appropriate accounting treatment while the cash forecast shows what collection dates can reasonably be supported.
A job can make a profit and still leave payroll waiting
Even the revised $80,000 in the example does not establish that every payment can be made on time.
A framing supplier and several trades may need paying before the next contractual stage is complete. An inspection delay or disputed progress claim can lengthen the gap. Retentions, where applicable, affect how much is collected as well.
Across several builds, those pressure points can arrive together.
A 13-week cash-flow forecast can follow the immediate receipts and payments, with a longer view through project completion. The government's cash-flow statement guidance provides the basic framework.
The guide to working capital for a new contract explains why winning more work can initially increase the cash requirement. New revenue comes with another build to deliver.
Give the next repayment a credible source
Premises finance, equipment funding and working capital serve different purposes, but each must fit the business's current position. Existing vehicle and equipment payments, interest, tax commitments and final balloons still need to be met.
The business-loan repayment capacity guide explains why earnings and affordable repayments need to be considered together. For premises finance, the purchase contribution and ongoing property costs matter too. For working capital, the expected receipts that will reduce the facility need to be clear.
A useful downside test follows a recognisable event, such as a delayed stage payment or a higher price for an uncommitted trade package. The proposed response should be something the owner can realistically carry out.
If the forecast shows persistent losses or an inability to meet commitments, prompt accounting and legal advice matters. The guide to when borrowing may not solve cash-flow problems helps distinguish a timing need from a deeper trading problem. Borrowing can add time and cash, but it also adds an obligation to repay.
Frequently asked questions
Can signed building contracts support a finance application?
They can help establish the work on hand. Current delivery costs, expected collections, overheads and existing commitments are still needed to assess the money available for repayments.
Do rising costs automatically mean a builder cannot borrow?
No. The effect depends on the remaining earnings, cash timing and proposed debt. An updated, supportable forecast is more useful than assuming approval or refusal.
Can I use the projection prepared when the jobs were signed?
Review it first. Material changes to supplier prices, trade costs or completion dates need to be explained in a current version.
Can new contracts cover losses on earlier jobs?
Do not assume that solves the problem. New contracts bring delivery costs and obligations of their own. Seek professional advice if the business depends on continual new cash to finish earlier work.
Keep the ambition, update the numbers
A full programme can still be a reason for confidence. Bringing the cost to finish, expected collections and revised earnings into the same conversation helps the next funding decision reflect the business as it stands today.
Assessing Your Next Business Loan?
Fairlane Finance can help you assess proposed borrowing against current project costs and business cash flow.
General information only. This article does not constitute financial, credit, legal, tax, accounting, compliance or valuation advice. Finance is subject to lender approval, eligibility criteria, terms, fees and conditions. Consider obtaining independent professional advice for your circumstances before acting.
