Top 10 Construction Loan Structures & How They Work

The Structure That Matches Your Build Type

Construction finance works differently to a standard home loan because your lender releases funds in stages as your build progresses, not as a single lump sum at settlement. The structure you choose determines when money gets released, how interest gets calculated, and what flexibility you have if costs shift during the build. Most lenders offer a construction to permanent loan that transitions automatically to a standard home loan once your build completes, but the way funds get drawn down during construction varies based on your contract type and lender.

Consider someone building a custom home in Mount Eliza with a registered builder on a fixed price building contract. They've secured land for $650,000 and signed a $580,000 build contract. Their lender approves a total loan amount of $985,000 but only charges interest on the amount drawn down at each stage. After the slab gets poured, they've drawn $295,000, so they're only paying interest on that portion while the remaining approved funds sit ready for future progress payments. By completion, they've drawn the full amount and the loan converts to a standard variable or fixed rate without reapplying.

Fixed Price Contracts vs Cost Plus Structures

A fixed price contract locks in your total build cost upfront, which makes lender approval more straightforward because the bank knows exactly what they're funding. Your progress payment schedule gets set in the contract, typically across five or six stages from base to completion, and your lender releases funds as each stage passes inspection. This structure suits most residential builds and gives you certainty around your loan amount from day one.

Cost plus contracts work differently. Your builder charges for actual costs plus a margin, so your final build price isn't locked until completion. Lenders treat these with more caution because the loan amount can creep up if material costs rise or the scope changes. You'll usually need a larger deposit and the lender may cap drawdowns at a percentage of the approved amount until they see how costs are tracking. This structure appears more often in custom builds where design details aren't finalised before construction starts, but it carries more risk for both you and the lender.

How Progressive Drawdown Actually Works

Your lender releases funds in instalments based on a progress payment schedule tied to construction milestones. Most residential builds follow a standard five or six stage schedule: base stage after the slab, frame stage once the roof is on, lockup once windows and doors are in, fixing after internal linings and services, and completion once the build is finished and certified. Your builder invoices for each stage, the lender arranges a progress inspection to confirm the work is done, then releases payment directly to the builder.

You only pay interest on the amount drawn down at each stage, which keeps your repayments lower during construction. If you've drawn $400,000 by lockup stage, your interest-only repayment options mean you're only servicing interest on that $400,000, not the full approved amount. Some lenders charge a Progressive Drawing Fee or Progressive Payment Schedule fee each time they release funds, typically between $300 and $500 per draw, so factor that into your budget when comparing construction loan options from banks and lenders across Australia.

Land and Construction Package Finance

If you're buying land and building in one transaction, most lenders structure this as a single loan with two settlement dates. The first settlement covers the land purchase, and construction drawdown starts once you've got council approval and your building contract is signed. You'll need to commence building within a set period from the Disclosure Date, usually six to twelve months, or the lender may review your approval.

A land and construction package in Mount Eliza might look like this: you find suitable land at $700,000 and have a build quote for $620,000. Your lender approves $1,056,000 at 80% of total cost. At land settlement, they release $700,000 to the vendor. You start paying interest on that amount immediately, even though construction hasn't started. Once your building contract is signed and council plans are approved, progressive drawdown begins for the build component. The advantage is you've locked in one approval and one loan structure for both components, but you're servicing interest on the land from day one.

Interest Calculations During Construction

During the construction phase, most lenders require interest-only repayments on the amount drawn down so far. Your repayments step up after each progress payment as more funds get released. If you've drawn $200,000 after base stage and your construction loan interest rate is 6.5%, you're paying roughly $1,083 per month in interest. After frame stage when you've drawn another $180,000, your repayments jump to around $2,058 per month.

Some borrowers underestimate how these stepped repayments affect their budget, particularly if there are delays between stages. If your build sits at lockup stage for two months while you wait for custom joinery, you're still paying interest on everything drawn to that point. Building that buffer into your budget before construction starts avoids cash flow pressure halfway through the build. Once construction completes and the loan converts to principal and interest, your repayments increase again because you're paying down the loan balance, not just servicing interest.

Owner Builder Finance and Why It's Different

If you're acting as an owner builder, expect lender criteria to tighten significantly. Most mainstream lenders either don't offer owner builder finance or require you to demonstrate relevant building experience and hold the right licenses. Those that do lend typically cap the loan at 60-70% of the completed value rather than the 80-90% available with a registered builder, meaning you need a much larger deposit or equity position.

The progressive drawdown structure for owner builders also differs. Instead of paying a builder after each stage, you're drawing funds to pay sub-contractors directly. Your lender releases money based on invoices from plumbers, electricians, framers, and other trades after each stage is inspected. You'll need to manage the progress payment schedule yourself, coordinate inspections, and provide detailed cost breakdowns to the lender at each draw. This adds administrative load and the lender's Progressive Drawing Fee still applies at each stage, so your total fees can mount up across a typical build.

Renovation Finance vs New Build Structures

Renovation finance uses a similar progressive drawdown model but the risk profile differs because you're improving an existing asset rather than creating a new one. Lenders typically require a detailed scope of works, quotes from licensed tradespeople, and sometimes a quantity surveyor's report if the renovation is substantial. The drawdown schedule mirrors your renovation stages rather than a standard construction sequence.

If you're doing a major renovation in Mount Eliza, adding a second storey or reconfiguring the entire floor plan, your lender treats it closer to new construction than a cosmetic update. You might draw funds across four or five stages as different trades complete their work. Interest gets charged on each drawdown just like new home construction finance, and you'll usually stay on interest-only repayments until the renovation completes. For smaller projects, a home improvement loan structured as a standard personal loan might offer a simpler alternative without progress inspections or drawdown fees.

When Development Application Timing Affects Your Structure

Your construction finance approval is conditional on having council approval before drawdown begins. If your development application is still with council when you apply for finance, most lenders issue conditional approval but won't release funds until you provide stamped, approved plans. The clock on your approval validity starts ticking from the date of issue, not from when council approves your plans, so delays at the council level can eat into your approval window.

In areas where development applications take longer to process, some borrowers lock in finance approval before their plans are finalised, only to find council requires changes that affect the build cost. If your approved plans come back $40,000 higher than your original quote due to council requirements for stormwater or setbacks, you may need to resubmit your construction loan application with the updated contract price. Timing your finance application to align with realistic council approval timeframes, rather than applying the moment you find land, can save you from rushing or reapplying.

Construction Funding for Spec Homes and Investment Builds

If you're building a spec home to sell on completion, lenders assess the deal differently. They're lending against a property with no end buyer locked in, so they focus heavily on the completed valuation, your exit strategy, and whether the local market can absorb the property at your target price. Spec home finance often requires a larger deposit, around 30-40%, and some lenders cap the loan term or require the loan to be repaid within a set period after completion.

The progressive drawdown structure remains the same, but your interest-only repayment options extend beyond completion because you're holding the property for sale rather than moving in. You're carrying the full loan balance plus any holding costs like rates and insurance until settlement with your buyer. If the Mount Eliza market slows and your spec home takes four months to sell instead of six weeks, those additional interest payments and holding costs come directly off your profit margin. Running the numbers on worst-case holding periods before you commit helps you work out whether the project still stacks up.

Switching Between Construction Loan Structures Mid-Build

Once your construction finance is approved and drawdown has started, switching lenders or restructuring the loan becomes complicated. You'd need to refinance the amount already drawn, get a new lender to take over the remaining progress payments, and coordinate the handover so your builder doesn't face payment delays. Most lenders won't touch a part-built property unless it's near completion, so you're generally locked into your original structure until the build finishes.

That's why getting the structure right at the start matters. If you think you might want to make additional payments during construction to reduce the loan balance early, confirm your lender allows that without penalties. If you want the option to extend interest-only repayments beyond the construction phase, check whether that's available under your loan terms before you sign. Once construction starts, your ability to adjust the structure is limited, so front-load those decisions during the application stage when you still have full flexibility.

If you're planning a build in Mount Eliza or anywhere across Australia and want to talk through which construction finance structure suits your contract type, build timeline, and budget, call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions