RBA Rate Cuts & Construction Loans: What KDR Borrowers Need to Know in 2026

The RBA's rate decisions in late 2024 and into 2025 set the tone for borrowing conditions in 2026. For anyone planning a knockdown rebuild, understanding how construction loans work in the current environment — and how rates affect your actual repayments — can save you significant money.

How Construction Loans Are Different

Unlike a standard home loan where you draw the full amount on day one, a construction loan releases funds in progress draws — typically 5–6 stages tied to build milestones: slab, frame, lock-up, fixing, and completion.

This matters for your repayments: you only pay interest on the amount drawn to date. If your build costs $800,000 and you've drawn $200,000 at frame stage, you're only paying interest on $200,000 — not the full amount. This is called the interest-only period and typically runs until completion.

What the Rate Environment Means for You

With the cash rate lower than its 2023–24 peak, construction loan variable rates from major lenders are broadly sitting in the 6.0–7.5% range depending on LVR and lender. The key metric for KDR borrowers is the all-in cost over the build period — typically 12–18 months of interest-only payments followed by principal-and-interest repayments once you move in.

Example: $1M construction loan, 6.5% interest rate, 14-month build averaging 60% drawn: interest cost over the build ≈ $45,500. Worth factoring into your total project budget.

Fixed vs Variable for Construction Loans

Most lenders don't offer fixed rates during the construction (interest-only) phase. The draw-down nature makes it difficult to fix — you're not sure exactly when each draw happens. Once construction is complete and you convert to a standard home loan, you can then choose to fix.

Given current rate conditions, many borrowers are choosing to stay variable for now and reassess at completion. Get advice from a broker before deciding.

The Valuation Challenge

Banks lend against the on-completion value of the property, not the build cost. If your block is worth $700K and the completed home is valued at $1.4M, the bank will lend based on that $1.4M figure (typically up to 80% LVR = $1.12M). But if the valuer comes in lower than expected, you may need more equity — a common source of surprise for KDR borrowers.

Tip: Get a pre-build valuation estimate from an independent valuer before committing to your builder contract. Some brokers include this as part of their service.

Top Tips for KDR Borrowers in 2026

• Use a broker who specialises in construction lending — not every broker understands progress draws and bank requirements for KDR
• Get pre-approval before signing with a builder — some builders require proof of finance before locking in a slot
• Factor 3–4% cost contingency into your loan amount — price variations during builds are common
• Ask your broker about bridging finance options if you're staying in the existing home during demolition planning