Construction Loan Costs in 2026: What's Changed for Tarneit & Wyndham Vale Builders

By Anjum Bansal, Founder & Principal Mortgage Broker, AB Mortgage Solutions Australian Credit Licence 384324 | Credit Representative Number 480316 Published 31 July 2026

Key takeaways

• Construction loans are structured around progress payments, with interest generally charged only on funds drawn at each stage — a key difference from a standard home loan.
• With the cash rate at 4.35% after three hikes earlier in 2026, construction loan repayments during the build phase are noticeably higher than they would have been building the same home two to three years ago.
• New-build purchases remain fully eligible for negative gearing and the CGT discount under the 2026 Budget reforms, which is a genuine relative advantage for investors building rather than buying established.

How construction loans work, briefly

Unlike a standard home loan where you draw the full amount at settlement, a construction loan releases funds in stages as the build progresses — typically slab, frame, lock-up, fit-out and completion. You generally pay interest only on the amount drawn at each stage, not the full approved loan amount from day one. That keeps repayments lower during the early stages of a build, but they climb as more of the loan is drawn down, and jump to full principal-and-interest repayments once construction completes.

What's changed for Tarneit and Wyndham Vale builders in 2026

Both suburbs remain two of Melbourne's most active house-and-land markets, and the interest rate environment during the build phase has shifted meaningfully this year. After three cash rate hikes in February, March and May, construction loan rates sit higher than they did when many current builds were first quoted and contracted — meaning some buyers are now paying more during construction than they originally budgeted for when they signed their building contract.

If you locked in a fixed price building contract some time ago but haven't yet drawn down your full construction loan, it's worth revisiting your interest cost assumptions now rather than assuming the numbers you were quoted at contract signing still hold.

The negative gearing angle for investors

Under the Budget reforms that took effect from 12 May 2026, negative gearing on established residential property purchased after that date will be restricted from 1 July 2027 — but new builds remain fully exempt, retaining both negative gearing and the 50% CGT discount (for gains accrued before the new indexation rules apply from 1 July 2027). For investors specifically weighing up build vs. buy-established in Tarneit or Wyndham Vale, this is a genuine, current tax-policy tailwind in favour of building — worth factoring into the comparison alongside construction risk and timeline considerations.

Practical cost factors beyond the loan itself

• Progress payment timing gaps. Delays between stages (weather, material supply, trade availability) can extend the period you're paying interest without the build advancing — budget a buffer beyond the builder's stated timeline.
• Council and connection costs. Utility connections, driveway crossovers and council fees are sometimes outside the headline building contract price — confirm what's actually included before finalising your loan amount.
• Contingency for variations. Site costs, upgraded inclusions and unexpected variations are common in growth-corridor builds — a loan sized to the exact contract price with no buffer can leave you short if anything changes.
• Rent plus mortgage overlap. If you're renting while building, factor in the period where you're covering both rent and construction loan repayments simultaneously.

What we'd check before approving a construction loan

1. Current interest rate assumptions against what was modelled when the building contract was signed, particularly for contracts signed before this year's rate hikes
2. Whether your fixed-price building contract genuinely covers all costs, or whether site costs and variations are estimated separately
3. Your buffer for progress payment delays extending the interest-only period
4. For investors, a side-by-side comparison of build vs. established purchase given the current negative gearing settings

Sources

RBA, Monetary Policy Decision, 30 July 2026. Australian Taxation Office, "Tax reform — Boosting home ownership," 2026.

This article is general information only and doesn't take into account your personal financial situation. It isn't financial or tax advice. Construction loan structures and costs vary by lender and builder — speak with a licensed broker before entering a building contract. AB Mortgage Solutions, Suite 503/89 Overton Rd, Williams Landing VIC 3027. Australian Credit Licence 384324.