How to Finance Investment Property Construction

Why Building an Investment Property Costs More Than You Think

Construction finance for investment property works differently to owner-occupied builds, and the lender will remind you of that every step of the way. You'll only pay interest on the amount drawn down during the build, which sounds helpful until you realise you're also covering rent or your current mortgage while the property generates nothing. Most lenders also charge a Progressive Drawing Fee each time they release funds to the builder, and those add up quickly across five or six progress payments.

Consider a scenario where you're building a dual-income unit on a block in Sippy Downs, close to the university. The land cost sits around the median for vacant blocks in the area, and the construction quote comes in at a fixed price under a standard HIA contract. You've structured the loan so the bank releases funds according to the builder's progress payment schedule, which typically breaks the build into stages like slab down, frame up, lock-up, fixing, and practical completion. Each drawdown triggers a progress inspection by the lender's valuer, and each inspection costs between $150 and $300. By the time the build finishes, you've paid somewhere between $750 and $1,800 just for someone to confirm your builder did what they said they'd do.

The other catch is serviceability. Lenders assess your ability to repay based on the full loan amount from day one, even though you're only drawing down progressively. If you're holding other investment debt or your income fluctuates, that can shrink your borrowing capacity faster than expected. Some borrowers assume they can use projected rental income to help serviceability, but most lenders won't include that until the property is complete and tenanted.

What a Construction to Permanent Loan Actually Does

A construction to permanent loan rolls the build phase and the ongoing mortgage into one approval. During construction, you make interest-only payments on whatever portion of the loan has been drawn down. Once the build finishes and you receive a certificate of occupancy, the loan converts to a standard investment loan with principal and interest repayments, or interest-only if you've structured it that way.

This structure saves you from needing two separate approvals and avoids the risk that your financial situation changes between the build and the final loan. It also locks in your construction loan interest rate at the time of approval, though some lenders allow you to choose between fixed and variable during the construction period. During the build itself, you'll typically have interest-only repayment options, which keeps your monthly outgoings lower while you're still covering other accommodation costs.

How the Progressive Drawdown Actually Works

The builder submits a claim at each stage of the build, usually tied to a fixed price building contract with a defined progress payment schedule. The lender sends a valuer to confirm the stage is complete, then releases the funds directly to the builder. You don't get to hold or redirect that money. The typical schedule runs something like this: 10% on signing, 15% on slab, 20% on frame, 20% on lock-up, 20% on fixing, and 15% on completion. Those percentages shift depending on the contract, but the principle stays the same.

If you're working with a cost plus contract instead of a fixed price contract, expect more scrutiny from the lender. Cost plus means the builder charges for materials and labour plus a margin, and the final price can move. Lenders don't love uncertainty, so they'll often cap the loan amount at a conservative percentage of the expected end value and ask for a larger deposit upfront. Some lenders won't touch cost plus at all for investment builds, particularly if you're also acting as an owner builder. Construction loans for owner builders come with higher rates and lower loan-to-value ratios because the lender sees more risk when you're managing trades yourself.

What Happens If the Build Runs Over Budget

Builders miss deadlines,材料 prices shift, and scope creep happens. If the build costs more than the approved loan amount, you'll need to cover the difference out of your own pocket before the lender releases the final drawdown. Most lenders build a small buffer into the approval, but it's rarely enough if the builder finds asbestos, council requires unexpected drainage work, or you decide to upgrade finishes halfway through.

In our experience, the smoothest builds are the ones where the borrower keeps a cash reserve equal to at least 10% of the construction cost, separate from the deposit. That reserve covers the gap between what the valuer says a stage is worth and what the builder says it cost, because those two numbers don't always agree. It also covers the gap between drawdowns if the builder needs to pay sub-contractors before the lender releases funds. Some builders will float that cost themselves, but plenty won't, especially smaller operators.

Why Sunshine Coast Builds Take Longer Than the Contract Says

Builders on the Sunshine Coast are juggling more work than they can staff, council approval timelines in Noosa and Maroochydore have blown out, and wet weather still shuts down sites for days at a time. A contract might promise a six-month build, but nine to twelve months is closer to reality. That's not necessarily the builder's fault, but it does mean you're paying interest on drawn funds and covering your own accommodation for longer than you planned.

Lenders usually require you to commence building within a set period from the Disclosure Date, often six to twelve months. If you miss that window, the approval can lapse and you'll need to reapply, which means another credit check, another valuation, and another round of serviceability assessment. If interest rates have moved or your income has changed, you might not get the same loan amount the second time. Some lenders will extend the commencement deadline if you ask early and have a valid reason, but they're not obliged to.

Should You Fix the Rate During Construction?

Some lenders let you fix the construction loan interest rate during the build, others only allow variable. If you do fix, you're locking in the rate on the full approved amount, even though you're only drawing down part of it. That can work in your favour if rates are rising, but it also means you're committed to that rate structure before the build even starts.

Most borrowers keep the construction phase variable and then decide whether to fix once the loan converts to a standard investment loan. That gives you more flexibility if the build drags on or if you want to make additional payments during construction to reduce the principal before conversion. Just make sure the loan allows additional payments without penalty, because not all construction products do.

The Paperwork You'll Actually Need

Lenders want council plans, a registered builder's contract, a progress payment schedule, proof you own the land or have a contract to purchase it, and a development application approval if the build requires one. If you're doing a land and construction package, the lender will assess both components together, but they'll usually require the land purchase to settle before they release the first construction drawdown.

If the build involves plumbers, electricians, or other licensed trades, the lender may ask for evidence that the builder has paid them before releasing the next stage. This protects the lender from having a half-finished build with unpaid contractors who could lodge a caveat against the title. It's also why some lenders insist on fixed price building contracts, they want certainty that the builder has locked in trade costs upfront.

What This Means for Your Cash Flow

You're paying interest on whatever portion of the loan has been drawn down, but you're not receiving rent yet. If you're building a house and land package in Caloundra and the build takes ten months, that's ten months of loan interest plus whatever you're paying to live elsewhere. If the construction loan amount is significant, that monthly interest bill can run into thousands of dollars, and it's all coming out of your income because the property isn't generating anything yet.

Some borrowers try to offset this by using a land and build loan structure with an offset account, but not all lenders offer that during the construction phase. Others try to rent out their current home and move somewhere cheaper temporarily, but that only works if your current home isn't also being used for serviceability or if you're not planning to sell it to fund the build. The cashflow pinch is real, and it's one of the reasons construction finance for investment property is harder to service than just buying an established rental.

If your income is tight or you're holding other investment debt, it's worth running the numbers with someone who understands how lenders assess this type of lending before you sign the building contract. A loan health check can flag whether your current structure will support the additional debt, or whether you need to rejig things first. Call one of our team or book an appointment at a time that works for you.

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