Construction Loans in Australia: A Plain-English Guide for Investors
A standard home loan to buy an established (already built) property is simple. You borrow, the money lands at settlement, you start repaying. Building from scratch is different in almost every way.
Building your own home is exciting, but the finance side can feel like the most confusing part especially when so much money is committed before there is anything to show for it. Once you understand how the pieces fit together, most of that uncertainty goes away.
Construction loans release funds in stages as the build progresses. Interest accrues only on what has been drawn. The lender is valuing a property that does not exist yet. Investors who understand how this works come out with fewer surprises. Those who do not often hit problems at the worst possible moments.
This guide covers how construction loans are structured, what lenders look for, and the risks worth knowing before you sign anything. All information is general in nature and does not constitute financial, tax, or investment advice.
16 min read
General information only
In this guide · 9 sections
What is a Construction Loan?
A construction loan finances the building or substantial renovation of a property. Instead of releasing the full amount at settlement, the lender pays out in stages (to fund the actual construction of the property). Each stage corresponds to a completed phase of construction. Interest is charged only on the amount drawn, not on the full loan amount.
Once the build is finished, the loan converts to a standard investment loan, either principal-and-interest or interest-only, depending on what you agreed at the start.
How Is This Different from a Standard Home Loan?
The core mechanics are different. Here is a side-by-side comparison.
When Does a Construction Loan Apply?
The most common scenarios investors encounter:
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Building on vacant land purchased separately from the construction contract
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House-and-land packages where the construction phase forms part of the overall transaction
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Significant structural renovations or extensions on an existing investment property
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Small residential developments, such as a duplex or pair of townhouses
Owner-builder arrangements: Most mainstream lenders apply strict restrictions when no registered builder is involved. If this applies, a mortgage broker can identify which lenders may still consider the application.
How Progress Payments Work
Progress payments, or drawdowns, are the staged release of loan funds as the build advances. The lender needs confirmation each stage is complete before releasing the next tranche.
Most residential builds follow a five-stage structure after the deposit.
Confirming Each Stage
Before releasing the next payment, lenders require either an inspection report or a builder's certificate. Some send their own inspector. Others rely on the builder's progress claim. Know which approach your lender uses before the build starts. It affects your ability to manage payment timing and avoid delays.
Interest During Construction
Interest builds with each drawdown. The early stages are manageable. By the final months, when the drawn balance is at its highest, costs are at their peak. Model this before you apply. Most investors are surprised how quickly the interest bill grows in the last quarter of a build.
After Construction: Loan Conversion
Once the final drawdown is made and the build is confirmed complete, the loan converts to its permanent structure. Some investors use this moment to review the rate, the term, or whether a different lender makes more sense. It is worth having that conversation before conversion happens automatically.
What Lenders Generally Assess
Construction loan applications get more scrutiny than standard home loans. The reason is simple: the security does not exist yet. Lenders need confidence in the borrower and the build.
What follows is what most lenders assess. Individual policies differ.
Licensed and Registered Builder
The builder must hold a valid licence in the relevant state or territory. Most lenders also require current domestic building insurance, which provides some cover if the builder becomes insolvent or fails to complete the project.
Do not take the builder's word on their licence status. Check it directly with the relevant state authority before signing anything.
Fixed-Price Building Contract
Most lenders will not approve a construction loan without a signed, fixed-price contract. It sets the total cost, the payment schedule, and the finished specifications. Without it, the lender cannot assess the loan amount or the end value with any confidence.
Building Approvals and Permits
Depending on where the project sits in its lifecycle, lenders may require permits or development approvals before releasing funds. Your builder or a town planner can confirm what is needed for your specific location.
End-Value Valuation
The lender commissions a valuation based on the plans and specifications for the finished property. That estimated end value is what the loan is assessed against, not the land price or construction cost in isolation.
If the valuation comes in lower than expected, the approved loan amount may shrink. Research comparable sales in the area before committing. It is one of the most overlooked steps in the process.
Deposit and Loan-to-Value Ratio
Most investment construction loans require an LVR of 80% or below. If your deposit and any land equity fall short, lender's mortgage insurance will likely apply. If you already own the land, its equity usually counts toward the calculation.
Borrower Serviceability
Lenders assess serviceability based on interest-only payments on the projected full loan balance, not the current amount drawn. If you are also servicing other loans or have variable income, be prepared to provide thorough documentation from the start.
Fixed-Price Contracts vs Variable-Price Contracts
The contract type you sign affects both your cost exposure and your ability to get finance. Most lenders will not touch a variable-price arrangement for a standard residential build.
Fixed-Price Contracts
A fixed-price contract locks in the total build cost. The builder completes the project for that sum, with variations charged separately only when the scope changes. For the lender, it provides certainty. For you, it limits cost blowout.
That said, fixed-price does not always mean fully fixed. Look for price escalation clauses. These allow builders to pass on material cost increases under defined conditions. Most investors sign without reading them carefully. Most disputes begin here.
Worth knowing
Before you sign a fixed-price contract, check:
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Price escalation clauses and the conditions that trigger them
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How "variation" is defined and what sits outside the agreed scope
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The dispute resolution process for variations you did not approve
Get independent legal advice before signing. This is not a step to skip.
Cost-Plus (Variable-Price) Contracts
A cost-plus contract charges the actual cost of the build plus a builder's margin. The final price is unknown upfront and can shift significantly as material costs, subcontractor rates, and complexity change.
Most mainstream lenders will not accept this structure for a residential investment build. If your builder is proposing it, speak to a mortgage broker before going further.
Managing Variations
Variations are changes to the agreed scope, whether you initiated them or the builder did. Every variation should be documented in writing before work begins: the cost, the change, and any revised timeline. Investors who do this avoid most disputes. Those who rely on verbal agreements usually regret it by handover.
Large variations can also affect the end-value valuation. Improvements may lift it. Extra spend without a matching uplift in value reduces your return.
The Construction Loan Process, Step by Step
Here is how it typically unfolds.
Step 01
Pre-approval
Many investors get a pre-approval before committing to land or a builder. It gives you a conditional view of your borrowing capacity based on your current financial position. For investors without a cash deposit, pre-approval can also cover refinancing the family home to access funds for the deposit, stamp duty, and holding costs.
Pre-approval is not a formal loan offer. Full assessment still happens once the build details are confirmed. But it gives you confidence when entering contracts.
Step 02
Land purchase (if applicable)
If you are purchasing land and building separately, the land is usually financed as a standard investment loan first, which can later be restructured or combined with the construction loan. Some lenders offer a combined land-and-construction product. Others prefer to keep them separate.
Step 03
Builder selection and contract
Builder selection is where most of the real risk in a construction project sits. A builder can have a great display home and still have a troubled business. Check the licence independently with your state authority. Confirm insurance is current. Talk to people who have built with them.
Cam hears this concern every week on discovery calls: how do you actually know if a builder is trustworthy before you have handed over a deposit? It's a fair question, and the right question to ask early in the process.
Oli Property's network of builders is assessed before any recommendation is made, drawing on more than 70 years of experience within the Oliver Hume Property Group. If you are still evaluating builders, speaking with our team is a good place to start.
Once the builder is selected, they prepare a fixed-price contract. Get it reviewed by a solicitor before you sign. It is a legally binding document that governs everything from payment timing to defect liability.
Step 04
Formal loan approval
With a signed contract in hand, the formal application can proceed. The lender commissions an end-value valuation and runs a full credit assessment. Build buffer into your timeline. Approval turnaround varies, and construction contracts often have fixed commencement dates.
As licensed mortgage brokers, Oli Property has a legal obligation to act in your interests when providing finance recommendations. That means the recommendation is based on your position, not a lender relationship.
Step 05
Construction drawdowns
As each stage is completed, your builder submits a progress claim. The lender confirms completion and releases the funds. Keep a running total of your interest costs throughout this period and compare it to your original budget. The final months are where most investors find the gap.
Step 06
Practical completion and handover
Practical completion means the property is ready for occupancy, even if minor defect work is outstanding. Walk the property thoroughly against the contract specifications before releasing the final payment. Write down every defect. Agree on rectification in writing. Once you sign off and the final payment is made, your leverage changes significantly.
Most contracts include a defect liability period after handover. Keep copies of all documentation.
Step 07
Loan conversion and rental
The construction loan converts to a standard investment loan upon final drawdown. At this point, engage a property manager and list the property for lease. Reducing the gap between handover and the first tenant is where financial planning meets market reality.
Tax and depreciation
Tax treatment for investment properties is complex. What follows is general information only, not advice. Talk to a registered tax agent before making any decisions with a tax dimension.
Depreciation on new builds
New properties are attractive from a depreciation standpoint because every element starts at full value. This supports stronger depreciation claims in the early years than for established properties, where much of the value has already been written down.
A quantity surveyor prepares the depreciation schedule once the build is complete. The schedule cost is usually tax-deductible. For most investors in new builds, it pays for itself quickly.
Interest during the construction period
Interest on investment borrowings is generally tax-deductible once the property is available for rent. Construction-period interest is more nuanced. Do not assume it is treated the same way as interest on a tenanted property. Confirm your specific position with a registered tax agent before lodging.
Land tax considerations
Land tax applies to investment properties in every state and territory, at varying thresholds and rates. Factor it into your holding cost projections before you buy the land, not after. The numbers look different depending on which state you are investing in.
Nothing in this section is tax advice. Tax rules change, individual circumstances vary, and the consequences of getting this wrong are real. Always speak to a registered tax agent before acting on anything tax-related.
Risks worth knowing
These are the issues investors most commonly encounter. Not a comprehensive risk assessment for your situation, but the ones that catch people off guard.
Committing to a build before a single brick is laid can often feel uncomfortable even for experienced investors. Knowing what to check for, and understanding the protections lenders and insurers already have in place, is what turns that unease into confidence.
01
Builder insolvency
If the builder goes under mid-project, the build stops. Domestic building insurance exists to cover this, but the extent of coverage varies by state and policy. The most reliable protection is working with a builder who has a track record of completing projects and a stable business. Some investors also hire an independent building supervisor to monitor progress and flag issues early.
02
Cost overruns
Fixed-price contracts reduce this risk but do not eliminate it. Variations, site conditions, and scope disputes can push costs above the original budget. A 5–10% contingency of the contract value is common. The right amount depends on the complexity of the build and the site itself.
03
Construction delays
Builds almost never finish on the projected date. Supply constraints, labour shortages, weather, and council inspection scheduling all contribute. For investors, every delay pushes out the start of rental income. If you are carrying the loan without an offsetting income stream, a lengthy delay puts real pressure on cash flow.
04
Interest rate exposure
Construction loans are typically variable-rate. If rates rise during the build, your monthly interest costs go up. Some lenders let you lock in a fixed rate for the post-construction period at the time of application. Whether that is worth doing depends on the rate environment at the time.
05
Valuation risk
The end-value valuation is a point-in-time estimate. If market conditions shift during the build, the completed property may come in at a different price. A lower-than-expected valuation at completion can limit refinancing options and affect your LVR.
This is more pronounced in Melbourne's growth corridors and emerging areas where comparable sales data is thinner. Established markets with longer sales histories tend to yield more predictable valuations.
06
Council and planning issues
Delays in approvals, unexpected compliance requirements, and design elements that need reworking all cost time and money. The best time to investigate planning, zoning, and site-specific overlays is before you sign the land contract, not after.
07
Rental income gap
There is no rental income from the moment the construction loan is established until the property is tenanted. That gap is commonly six to eighteen months or longer. Work out what that costs you, month by month, before you commit. Make sure there is cash flow to carry it.
Construction loans and house-and-land packages
House-and-land packages pair a land block in a new estate with a building contract for a nominated design. The land and construction are priced together but funded separately.
How the financing works
The land settles first as a standard property transaction. If the land is titled, settlement is immediate. Untitled land can take months to finalise, which affects the construction loan setup. The construction loan is drawn down once land has settled and the builder is ready to start. Some lenders offer a combined land-and-construction product. Others keep the two components in separate facilities.
Why Melbourne's growth corridors work for investors
Growth corridors attract investors for straightforward reasons: entry prices below established suburbs, strong rental demand from families, and the depreciation benefits that come with new construction. The stock is accessible. The tenant pool is consistent.
Oli Property draws on the Oliver Hume Property Group Land Index & Residential Outlook to identify which locations actually have the fundamentals to support this. Not all growth corridors are equal. The data tends to show that quickly. See how we approach location selection.
Frequently asked questions
More investor questions answered on the Oli Property FAQ page.
Yes. Construction loans are available for investment properties. Lenders may apply different conditions, rates, and LVR limits compared to owner-occupier construction loans.
Most lenders require 20% of the projected end value to avoid lender's mortgage insurance. Some will go lower, but LMI applies. If you already own the land, that equity often counts toward the deposit requirement.
Yes. Pre-approval gives you a conditional view of your borrowing capacity before the build details are finalised. It is not a guarantee of formal approval, which requires a contract and end-value valuation. It does give you more confidence when entering land contracts.
Any additional cost is covered by your own savings or available equity. This is why a contingency budget matters and why managing variations carefully throughout the build is worth the effort. Speak with your lender or broker about what options exist if costs climb materially.
The construction phase typically runs six to eighteen months. Most lenders set a maximum construction period, often twelve months, with extensions available in some cases. Once the build is complete, the loan converts.
No. The property cannot be occupied or rented until practical completion, and the Certificate of Occupancy is issued. Having a property manager in place before that point reduces the vacancy period.
It sets the total build cost before construction starts. Without it, the lender cannot reliably assess the loan amount or the security's final value.
LMI applies when your LVR exceeds the lender's threshold, typically 80% for investment construction loans. Cover 20% of the projected end value with deposits and land equity; LMI is generally not required.
Ask your tax agent, not your lender. Construction-period interest treatment can be nuanced. Do not assume it follows the same rules as interest on a tenanted property.
Next steps
Construction finance is not complicated once you understand the structure. The decisions that actually matter — which lender, what contract terms, which location — are the ones where experience pays.
Oli Property works with investors across Melbourne and nationally, pairing them with mortgage brokers who know construction finance and using Oliver Hume's research to identify locations worth building in.
If you are working through the numbers on a build, book a discovery call, and we can walk through what it looks like for your situation.
Ready to start?
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