Construction Finance
What Happens If Costs Increase During Build?
5 min read- Finance Guide
- Updated 2026
Quick answer
Overruns can create
1x funding gap risk
when costs rise above the approved budget
- Common trigger Variations
- Lender response May pause draws
- Typical fix Borrower top up
1300 421 044
1300 421 044
Detailed explanation
A construction loan is approved against a defined budget, approved plans, contract sum and expected completed value. If labour, materials, site works, engineering requirements or client requested changes push the cost higher, the overrun must be managed before it becomes a payment problem. This is why lenders, builders and borrowers all focus heavily on variations, contingencies and cost control during the build.
Where cost overruns usually come from
Build costs often increase for a few repeat reasons
- 01Contract variations
- 02Site and earthworks surprises
- 03Material price increases
- 04Labour cost changes
- 05Specification upgrades
- 06Valuation shortfalls
When costs rise:
Builder may issue a variation or revised claim- Borrower must check whether the increase is funded
- Lender may reassess the file or pause the next draw
- Borrower may need to contribute extra funds before work continues
How lenders usually deal with overruns
Typical construction loan responses to higher costs:
-
the original approved facility usually remains capped unless the lender agrees to reassess
-
borrowers may need to inject savings or usable equity to meet the overrun
-
lenders look closely at updated end value and whether the project still stacks up
-
if the end valuation does not rise with the new cost, the LVR can worsen
-
contingency buffers can reduce disruption but may not cover large variations
Overrun pressure points
-
Minor overrun
Manageable
-
Moderate overrun
Review needed
-
Major overrun
Extra equity
How lenders assess a cost overrun
Lenders review
original building contract and any signed variations- updated builder invoices and revised cost to complete
- whether the changes affect approvals, plans or scope
- the total build cost breakdown after the increase
- the projected completed value and any valuation shortfall
- borrower cash contribution, equity and servicing position
- whether the build timeline has slipped as well as the budget
Typical outcomes
-
Small increase
Borrower pays gap
-
Unfunded variation
Draw may pause
-
Low end valuation
More equity needed
-
Scope reduction
Common fallback
Need Help with your Project?
Common problems
Cost overruns are one of the most common pressure points in construction finance. Problems usually start with variations, valuation gaps or missing contingency, then become serious when the next progress payment arrives before the extra funds are sorted.
Variation blows out the budget
Changes to finishes, fixtures, engineering or site works can push the build above the approved contract sum.
Possible solutions include:
approve variations carefully and in writing- use contingency funds first
- contribute additional cash if required
- remove non essential upgrades
Completed value does not keep up
The build can cost more without creating equal extra value, which can weaken the LVR and trigger a funding gap.
Possible solutions include:
- obtain an updated valuation if appropriate
- inject more equity or savings
- reduce loan reliance where possible
- review whether the project still makes sense
Next progress payment cannot be met
If the builder submits the next claim before the overrun is covered, the lender may not release further funds until the shortfall is resolved.
Possible solutions include:
- speak to the lender before the claim falls due
- provide updated contract and variation evidence
- fund the difference from own resources if required
- consider refinance after completion if value supports it
Steps to manage a build overrun
Step
01
Identify exactly why the build cost has increased.
Step
02
Collect signed variations, revised invoices and updated costings.
Step
03
Check whether contingency funds or unused facility limits remain.
Step
04
Notify the lender before the next draw is due.
Step
05
Work out whether you need to add savings or equity.
Step
06
Finish the build and review refinance options after completion.
Speak with a Property Finance Specialist
Construction funding can become more complex when build costs rise, valuations come in lower than expected, or progress payments are delayed.
A specialist can review the shortfall, explain what the lender is likely to do next, and help assess possible ways to keep the build moving.
Speak with a finance specialist about your construction funding project
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Additional Questions
You may also find these questions helpful
-
01Can a construction loan be increased during the build?
-
02Who pays if a building contract variation increases the cost?
-
03What happens if the end valuation is lower than the build cost?
-
04Can a lender pause progress payments during a cost overrun?
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05How much contingency should you allow for a build?
