Construction Loan Structures: What Not to Confuse

How Construction Loan Structures Actually Work

A construction loan releases your money in stages as the build progresses, not in one lump sum at settlement. You only pay interest on what's been drawn down, which keeps your repayments lower while the house goes up. The structure determines who controls the drawdown schedule, how much you hold back for final completion, and whether you refinance at the end or convert automatically to a standard home loan.

Most lenders in Australia offer a construction to permanent loan, which means the facility converts to a normal variable or fixed home loan once the build finishes and you move to principal and interest repayments. During construction, you're typically on interest-only with payments calculated on the progressive drawdown amount. The alternative is a construction-only loan that you must refinance or pay out at practical completion, though these are less common for owner-occupiers and more typical in commercial or spec home projects.

Land and Construction Package vs Separate Loans

A land and construction package bundles the land purchase and the build into one loan application with one approval. The lender assesses both components together, which means your borrowing capacity is calculated against the total project cost upfront. You settle on the land first, then the construction funding sits ready to draw as building starts.

Consider a buyer in Randwick looking at a house and land package near the Prince of Wales Hospital precinct. They've found suitable land at $950,000 and have a fixed price building contract for $580,000. A land and construction package would approve them for $1,530,000 total, settle the land, then release the construction component progressively as the builder hits each stage. The lender might require them to commence building within six months from the land settlement, so timing the development application and council approval becomes part of the loan structure.

If you already own the land, you're applying for construction finance only, and the lender will value the land as security separate from the build cost. This can affect your deposit requirement because the land equity might cover part or all of the 20% threshold, depending on how long you've held it and whether values have moved.

Fixed Price Contract vs Cost Plus Contract

Your building contract type changes how the lender structures the drawdown and assesses risk. A fixed price building contract locks in the total build cost, and the lender will approve your construction loan amount based on that figure plus a small contingency buffer. The progress payment schedule is set in the contract, usually five or six stages, and the lender releases funds as each stage completes and passes inspection.

A cost plus contract means you're paying the builder's actual costs plus a margin, and the final price isn't locked. Most mainstream lenders won't touch cost plus arrangements for residential builds because the loan amount can't be fixed at approval. If you're doing an owner builder project or a custom design with a cost plus structure, you'll need a specialist lender and a larger contingency allowance built into the loan amount, often 10% to 15% above the estimated cost.

In our experience, fixed price contracts are the only structure most Randwick clients will encounter unless they're building something highly custom or acting as their own builder. The bank wants certainty, and cost plus removes that.

Progress Payment Schedule and Drawdown Timing

The progress payment schedule is written into your building contract and defines when the builder gets paid. Typical stages are base stage, frame stage, lock-up, fixing, and practical completion. Each stage triggers a drawdown request, which the lender processes after a progress inspection confirms the work is done.

The lender usually holds back 5% to 10% of each progress payment as retention, releasing it only after practical completion and final inspection. This protects you if the builder walks off site or leaves defects unfinished. Some lenders also charge a progressive drawing fee each time you request a drawdown, typically $150 to $300 per stage, which adds up over five or six payments.

Your builder invoices you, you forward that invoice and the stage completion notice to the lender, the lender arranges an inspection, then releases the funds directly to the builder's account. You don't handle the cash. The inspection is usually done by a third party valuer or building consultant, not the lender's own staff, and the cost of each inspection is either built into the progressive drawing fee or charged separately at $200 to $400 per visit.

Interest Rate During Construction

Most lenders charge a variable construction loan interest rate during the build, even if you plan to fix the rate once the loan converts to permanent. You're paying interest only on the amount drawn down, recalculated every time a new stage is released. If you've drawn $300,000 by lock-up stage, your monthly interest cost is roughly $1,500 at current variable rates, not the full loan amount.

Some lenders let you fix part of the construction loan during the build, but the structure gets messy because the loan balance is moving every few weeks. The common approach is to stay variable during construction, then split or fix once you convert to the permanent loan and move to principal and interest repayments. You can explore your refinancing options at that point if another lender offers a lower rate, though most borrowers stay with the original lender to avoid another application process.

Renovation Finance vs New Build Finance

A house renovation loan uses the same progressive drawdown structure, but the property is already standing and usually occupied. The lender values the existing property, assesses the renovation cost, and releases funds in stages as the work completes. You're often living in the house during construction, which adds complexity around access for inspections and stage definitions when you're not building from a slab.

Randwick has a lot of older semi-detached and terrace stock near Coogee Beach and along Avoca Street, and renovation finance is common for clients adding a second storey or reconfiguring the ground floor. The structure is the same as a new build loan, but the valuer is assessing improvement to an existing asset rather than completion of a new one. If you're doing a major reno that requires council plans and a development application, the lender will want to see those approvals before they release the first drawdown, just like a new build.

If the scope is smaller and the cost is under $50,000 or so, some lenders will offer a home improvement loan as a personal loan or a top-up to your existing mortgage, paid in one lump sum rather than progressive stages. That's not a construction loan structure, it's just additional borrowing, and you're paying interest on the full amount from day one. For anything involving structural changes, plumbers, electricians, or work that needs permits, you'll need the staged construction finance model.

Owner Builder and Registered Builder Requirements

If you're using a registered builder, most lenders will approve a standard construction loan structure without additional conditions. If you're acting as an owner builder, the pool of lenders shrinks dramatically, and the ones who do lend will usually cap your loan to value ratio at 70% or 75%, meaning you need a bigger deposit.

Owner builder finance also tends to come with tighter controls on the progress payment schedule and a requirement that you can demonstrate building experience or engage a qualified project manager. The lender sees more risk because there's no building warranty insurance and no single contractor holding responsibility for the whole job. You're also expected to pay sub-contractors yourself from each drawdown, which means you're managing the flow of funds rather than the lender paying a head contractor.

For Randwick clients, owner builder is rare unless you're in the building trade yourself. Most projects use a registered builder, which keeps the construction loan application straightforward and opens up the full panel of lenders across Australia.

What Happens When the Build Finishes

At practical completion, the lender orders a final valuation to confirm the property is finished and worth at least the total loan amount. If the valuation comes in lower than expected, you might need to pay down the difference or accept a higher loan to value ratio, which can trigger lenders mortgage insurance if you're above 80%.

Once the final drawdown is released and retention paid, the loan converts from construction to permanent. Your repayments switch from interest-only on a moving balance to principal and interest on the full loan amount. If you were approved for $1,530,000 and drew the full amount, your repayments jump significantly at this point, so it's worth running the numbers before you start the build to make sure you can service the permanent loan, not just the construction phase.

Some clients assume they'll refinance to a lower rate as soon as the build finishes, but if property values have dropped or your financial situation has changed, you might not qualify for a new loan at the same amount. The construction to permanent structure protects you because the loan is already approved and converts automatically without a new application, but that also means you're locked into whatever rate and terms you agreed to at the start unless you actively refinance.

When to Apply for Construction Finance

You need council approval and a signed building contract before most lenders will issue a formal construction loan approval. Some brokers can get you a conditional approval earlier in the process, based on estimated build costs and a draft contract, but the final approval won't be released until the paperwork is locked in.

The approval is usually valid for three to six months, and most lenders require you to commence building within a set period from the disclosure date, typically six months. If you're buying land and waiting for subdivision or title to issue, the timing can get tight, and you might need to extend the approval or reapply if the project drags out.

In Randwick, where most residential building is infill or knockdown rebuild on small blocks, council approval timelines vary depending on whether you're in a heritage area or subject to design review. If your project is near the Randwick Town Hall conservation area or along the coastal slope toward Clovelly, expect longer assessment times, and factor that into your construction loan application timing.

Call one of our team or book an appointment at a time that works for you. We'll structure the construction loan around your project timeline and make sure the drawdown schedule matches your builder's contract, so you're not stuck paying unnecessary interest or covering gaps out of your own pocket while the bank processes an inspection.

Frequently Asked Questions