Construction loan interest rates work differently from a standard home loan — you usually pay interest only on the money that’s actually been drawn down, not the full loan, until your build is finished. That single feature changes how much you pay during construction and why the numbers can look confusing at first. This guide explains how construction loan rates are structured, what makes yours higher or lower, and how it all applies to a modular, kit or owner-builder build.
How construction loan interest is charged
A construction loan is released in stages (progressive drawdowns) that line up with your build milestones. You’re only charged interest on the amount drawn so far — so your repayments start small and grow as each stage is funded. Most lenders run the loan as interest-only during construction, then convert it to a standard principal-and-interest home loan once the build is complete.
| Build stage | Typical drawdown | What you pay interest on |
|---|---|---|
| Deposit / slab | First release | Only the first drawdown |
| Frame | Next release | Deposit + frame drawn |
| Lock-up | Next release | Cumulative amount drawn |
| Fit-out / fixing | Next release | Cumulative amount drawn |
| Completion | Final release | Full loan → converts to P&I |
For the full mechanics of drawdowns and inspections, see how construction loans work.
Fixed vs variable during construction
Most construction loans are variable during the build, because progressive drawdowns and fixed rates don’t sit together neatly. Many borrowers fix (or split) only once the loan converts to a standard home loan at completion. The trade-off is the usual one: variable gives flexibility and the benefit of any rate falls; fixing gives certainty of repayments.
What shapes your construction loan rate
- Loan-to-value ratio (LVR): a bigger deposit / more land equity usually means a sharper rate
- Build type: a standard registered builder is viewed differently from an owner-builder or a non-standard dwelling
- Property type: modular, kit and relocatable homes can be treated differently by lenders
- Your profile: income, credit history and existing commitments
- Fixed vs variable and whether you package the loan
We don’t quote a specific rate here because construction rates move constantly and depend on all of the above — a broker can compare current lender rates for your build.
How this applies to modular, kit and owner-builder builds
Non-standard builds are exactly where rates and lender appetite vary most. Modular and prefab homes may have different drawdown structures (some manufacturers require larger progress payments earlier), and owner-builder finance is assessed more conservatively, which can affect both your rate and your maximum LVR. If you’re financing a factory-built home, our modular and prefab home finance page covers the specifics. A knockdown rebuild is treated differently again, because demolition sits at the front of the project and the land already has value the lender can weigh. Buying the block first changes the structure again — a land and construction loan settles the land before the build draws begin.
Keeping your construction interest costs down
- Put down a larger deposit or use land equity to lower your LVR
- Keep your drawdown schedule tight so you’re not paying interest on money sitting idle
- Compare lenders — construction rate margins vary more than standard home loans
- Plan the conversion to P&I (and any fixing) before completion, not after
Want current construction rates for your build? Talk to a specialist who finances modular, kit and owner-builder homes every day. Get started → or call 1300 391 390 · Contact us.
Construction loan interest rate FAQs
Are construction loan interest rates higher than home loan rates? They’re often similar to or slightly above standard variable home loan rates, but you typically pay interest only on the amount drawn during the build, so your early repayments are lower. Non-standard builds can attract a higher margin.
Do you pay interest on the whole construction loan straight away? No. Interest is charged only on the funds drawn down at each stage, growing as the build progresses, until the full amount is drawn at completion.
Can you fix a construction loan interest rate? Most construction loans are variable during the build; many borrowers fix or split the rate once the loan converts to a standard principal-and-interest home loan at completion.
What affects my construction loan rate? Your LVR/deposit, build type (standard builder vs owner-builder), property type (including modular or kit homes), your credit profile, and whether you choose fixed or variable.
Are rates different for owner-builder or modular home loans? They can be. Owner-builder finance is assessed more conservatively and modular/prefab builds may have different drawdown structures, both of which can affect your rate and maximum LVR.
This article is general information only and does not constitute credit or financial advice. Little Home Loans operates under Australian Credit Licence 506065 (Five Tees Pty Ltd). Any rate references are general and indicative only and subject to change; your rate depends on your circumstances and the lender. Lending is subject to approval, lending criteria, terms, conditions and fees. Written and reviewed by the Finance Director at Little Home Loans.
