Construction Loans in Australia 2026: Complete Guide to Finance a New Build

A construction loan is a short-term, specialist mortgage designed to fund the building of a new home. Unlike a standard home loan, where the entire amount is drawn down on settlement day, a construction loan releases funds progressively as each stage of the build is completed. You pay interest only on the amount drawn so far, which keeps costs lower during the build period.

How Construction Loan Drawdowns Work

Most lenders release construction funds in five standard stages, aligned to industry milestones:

Stage	What it covers	Typical % of loan
1. Deposit / slab	Site preparation, footings, concrete slab poured	10–15%
2. Frame	Wall frames and roof trusses erected	20%
3. Lock-up	External walls, windows, doors installed	20%
4. Fixing	Internal fit-out, plumbing, electrical, plasterboard	20–25%
5. Completion	Final inspection, Certificate of Occupancy issued	20–25%

At each stage, your builder submits a progress claim. You (or your lender) inspect the work, and funds are released directly to the builder. You pay interest-only on the cumulative drawn balance, not on the full approved loan amount.

Construction Loans vs Standard Home Loans

	Construction Loan	Standard Home Loan
When funds released	Progressive, stage by stage	All at settlement
Repayments during build	Interest-only on drawn amount	P&I from day one
Requires building contract	Yes, fixed-price contract required	No
Valuation	Based on land value + "as if complete" valuation	Based on purchase price
Maximum LVR	Up to 95% (with LMI, owner-occupier)	Up to 95% (with LMI)
Rate type	Usually variable during build	Fixed or variable

Why New Builds Are Now the Most Tax-Advantaged Property

The 2026 Federal Budget introduced a significant structural change: from 1 July 2027, negative gearing losses on established residential properties acquired after 12 May 2026 cannot be immediately deducted against other income, they carry forward. New residential builds are explicitly exempt. Investors who build a new home retain full negative gearing: losses offset against salary, wages, and other income as in previous law.

Combined with the fact that new builds often attract the First Home Guarantee (5% deposit, no LMI), stamp duty concessions in most states, and the First Home Owner Grant in some states, building new has never had a larger tax and policy advantage over buying established property.

What Lenders Require for a Construction Loan

• Fixed-price building contract, A signed contract with a licensed builder showing the total cost of construction. Cost-plus contracts are generally not accepted.
• Licensed builder, The builder must be registered and hold builder's warranty insurance (home indemnity insurance).
• Council-approved plans and permits, Development approval (DA) or building permit must be in place before funds are released.
• Land ownership or purchase, You must either own the land or be simultaneously purchasing it (via a split loan).
• Adequate insurance, Construction insurance (contract works insurance) is typically required before work starts.

House-and-Land Packages: How the Finance Works

A house-and-land package involves purchasing vacant land and then engaging a builder under a separate contract. The finance is usually structured as a split loan:

• Land loan, A standard mortgage drawn down on settlement of the land purchase. Principal and interest repayments start immediately.
• Construction loan, Drawn progressively as the build progresses. Interest-only during construction.

When construction completes, both facilities are typically rolled into a single home loan. The key risk with house-and-land packages is timing: if settlement of the land is delayed, you may start paying land loan repayments before the build begins, creating a double-repayment period. A good mortgage broker structures the drawdown schedule to minimise this gap.

Knockdown Rebuild: Can I Use a Construction Loan?

Yes. If you own an existing property and plan to demolish the current dwelling and build a new one, a construction loan is the standard finance vehicle. The loan is secured against the land value only during the demolition and early build phases, which can affect LVR calculations. Most lenders require the existing property to be unencumbered (or the construction loan to be large enough to repay any existing mortgage).

Risks and Things to Watch

• Cost overruns, Fixed-price contracts protect you against builder overruns, but variations (owner-requested changes) are extra and funded from your savings.
• Builder insolvency, If your builder collapses mid-construction, builder's warranty insurance covers completion costs up to a cap. Choose a builder with a strong track record and financials.
• Delays, Construction timelines rarely match projections. A 9-month build becoming a 14-month build extends your interest-only period and delays the start of your owner-occupied life or rental income.
• Valuation shortfall, If the completed property is valued below the total loan amount (land + construction), the lender may not release final drawdown funds without additional security.
• Rate risk, Construction loans are almost always variable rate. If rates rise during your build, your interest-only repayments increase.

How iSmart Finance Helps

Not every lender offers construction loans, and policies on LVR, builder requirements, and drawdown timing vary significantly. iSmart Finance compares construction loan options across 30+ lenders, including banks that offer the lowest construction rates and those with the most flexible drawdown processes, and structures your land and construction facilities to minimise the gap period and interest cost.

Book a free consultation to discuss your construction project, use our repayment calculator to model your ongoing mortgage after the build completes, or check your LMI cost if your deposit is under 20%.