How Construction Loan Structures Differ from Standard Home Loans
A construction loan operates on a progressive drawdown structure rather than providing the full loan amount upfront. Lenders release funds in instalments as your builder completes specific stages of the build, with each payment tied to a progress inspection conducted by the lender's appointed valuer.
This structure exists because construction finance carries different risk characteristics to a standard mortgage. When you purchase an established property, the lender has immediate security over a completed asset. During construction, the asset doesn't exist yet. The progressive drawdown ensures funds are only released as value is created, protecting both you and the lender if the project encounters delays or issues.
Most lenders only charge interest on the amount drawn down at any given time, not the full approved loan amount. If your total facility is $600,000 and you've drawn $200,000 for the slab and frame, your interest calculation is based on $200,000. This differs markedly from a standard mortgage where interest accrues on the entire principal from settlement day.
Construction to Permanent Loan Structures in Oakleigh South
The construction to permanent loan combines your building phase and ongoing mortgage into a single approval. You complete one construction loan application, receive one approval covering both phases, and transition from construction funding to standard repayments once the build is complete and you receive your occupancy certificate.
Consider a buyer purchasing suitable land in Oakleigh South near the Oakleigh South Primary School precinct. They secure a $550,000 facility comprising $200,000 for land and $350,000 for construction. During the building phase, they make interest-only payments on drawn funds. Once construction reaches practical completion, the loan converts to principal and interest repayments, and they can choose to lock in a fixed rate or remain on a variable rate at that point.
This structure requires only one application process and one set of establishment fees. Lenders assess your borrowing capacity based on post-completion repayments, meaning you need to demonstrate you can service the full loan amount from day one, even though you won't be making those repayments until the build is finished. The alternative approach involves a standalone construction facility that you refinance into a standard mortgage at completion, which creates two separate approval processes and typically higher overall costs.
How the Progress Payment Schedule Works
The progress payment schedule defines when funds are released during your build. Most residential construction loans use a five or six-stage drawdown aligned to key construction milestones: base stage after slab completion, frame stage once the roof is on, lockup stage when windows and doors are installed, fixing stage after internal fit-out, and practical completion when the build is finished and certified.
Your registered builder provides invoices at each stage. You submit the invoice to your lender, who arranges a progress inspection. The valuer attends the site, confirms the claimed work is complete to an acceptable standard, and verifies that the value created matches the funds being requested. Once the valuer's report is approved, the lender releases payment directly to the builder, usually within three to five business days.
Lenders charge a Progressive Drawing Fee for each inspection and payment, typically between $250 and $400 per drawdown. With five stages, that's $1,250 to $2,000 in fees across the build. Some lenders cap this at four or five inspections regardless of how many payments occur. Others charge per inspection without limitation, which becomes relevant if your builder requests interim payments or if variations extend the payment schedule beyond the standard stages.
Fixed Price Contracts vs Cost Plus Structures
A fixed price building contract specifies the total construction cost upfront, with limited scope for variation once signed. The builder quotes a final price, you agree to that figure, and the contract protects you from cost overruns unless you request changes or unforeseen site conditions arise. Most volume builders and project home companies use fixed price contracts, and most lenders prefer them because they create certainty around the final loan amount.
A cost plus contract involves paying the actual construction costs plus a margin to the builder. This structure appears more often in custom design projects or high-end architectural builds where the scope isn't fully defined at the start. The builder charges their costs for materials and labour, then adds a percentage fee or fixed management charge on top.
Lenders scrutinise cost plus arrangements more closely during the construction loan application. They typically require a quantity surveyor's estimate before approval and may cap the loan amount at a percentage of that estimate rather than the builder's open-ended projection. The additional risk stems from the lack of a defined ceiling on construction costs, which creates uncertainty about whether the approved loan amount will cover the completed build. Owner builder finance operates similarly, with lenders often requiring detailed quotes from each trade and capping loans at 80% of the completed property value rather than the standard 90% or 95% available under fixed price contracts.
Land and Construction Package Structures
A land and construction package combines the land purchase and building contract into one coordinated transaction. Developers offer these in growth areas, pairing titled lots with builder agreements from their preferred panel. You settle on the land first, then construction commences shortly after, usually within three to six months.
Oakleigh South has limited new subdivisions compared to outer growth corridors, but house and land packages appear occasionally when larger blocks are subdivided or older homes are demolished. The structure suits buyers who want a turnkey solution without sourcing land and builder separately.
From a lending perspective, land and build packages receive standard assessment if the land is titled and the builder holds appropriate registrations and insurance. The challenge emerges with off the plan finance where the land isn't yet titled. Lenders assess these differently because you're committing to a contract on a lot that doesn't legally exist as a separate parcel yet. Most require a 10% deposit at contract signing, hold that deposit in trust until title is issued, then settle the land component before releasing construction funds. Your construction loan interest rate and ongoing terms remain the same, but the approval process requires development application and council approval documentation to confirm the subdivision will complete.
Interest-Only Repayment Options During Construction
During the building phase, you make interest-only payments on the drawn amount, not the full approved facility. If you've drawn $150,000 by frame stage, your repayment is calculated as interest on $150,000 at your applicable construction loan interest rate. As additional draws occur, your repayment increases incrementally.
This structure manages cash flow during a period where you're often paying rent or an existing mortgage while the new property is being built. Once construction reaches practical completion and you receive an occupancy certificate, the loan converts to principal and interest repayments based on the full amount drawn.
Some borrowers make additional payments during construction to reduce the principal before converting to standard repayments. Most construction facilities allow this without penalty during the interest-only period, though you should confirm redraw availability if you may need to access those funds before completion. The ability to make additional payments depends on your loan structure, with some lenders offering full redraw facilities and others prohibiting redraw entirely during the construction phase to maintain clear separation between drawn and available funds.
Managing Variations and Contingency in Your Loan Structure
Most lenders require a contingency buffer within your approved loan amount to cover variations and cost increases during construction. The standard approach involves approving a facility 5% to 10% above the contracted build price plus land cost. If your land is $200,000 and your fixed price building contract is $400,000, the total is $600,000, but your approval might extend to $630,000 or $650,000 to accommodate unforeseen costs.
This contingency isn't drawn automatically. It remains available if required but doesn't attract interest unless you access it. If the build completes within budget, you only owe the amount actually drawn. If variations occur such as upgrading fixtures, addressing poor soil conditions, or rectifying builder delays, you submit those costs through the standard progress payment process and draw from your contingency allocation.
Development-related costs sometimes catch buyers unprepared. Council approval conditions might require stormwater upgrades, street tree planting, or footpath reinstatement. These costs fall to you, not the builder, and can range from $5,000 to $20,000 depending on the site and local council requirements. Oakleigh South falls within the City of Monash, which has specific stormwater and sustainability requirements for new builds. Building in your contingency buffer and confirming your lender will release funds for these non-builder costs avoids funding gaps late in the project.
Choosing Between Variable and Fixed Rates for Construction
Construction loans typically start on a variable rate during the building phase, even if you intend to fix the rate later. Lenders structure it this way because construction periods vary, making fixed rate terms impractical during the build. Once construction is complete and the loan converts from progress payment finance to standard repayments, you can lock in a fixed rate if your loan structure includes that option.
Some lenders allow you to lock a fixed rate at application, with the rate held for up to 12 months until construction completes. If your build finishes within that window, you transition directly to the locked rate. If it extends beyond the lock period, you either revert to the variable rate or pay a fee to extend the lock.
The decision depends on your outlook for the rate environment and your build timeline. If construction is expected to take eight to ten months and rates are rising, locking at application provides certainty. If rates are stable or declining, staying variable during construction and fixing at completion might deliver a lower rate overall. Most borrowers using a construction loan through a broker assess rate options at both application and practical completion, adjusting their strategy based on current market conditions at each decision point.
Call one of our team or book an appointment at a time that works for you to discuss which construction loan structure suits your building project and financial situation.
Frequently Asked Questions
How does a construction to permanent loan differ from a standard construction loan?
A construction to permanent loan combines building finance and your ongoing mortgage into one approval, converting automatically to standard repayments once construction completes. This avoids refinancing costs and a second application process at the end of the build.
Do I pay interest on the full loan amount during construction?
No, lenders only charge interest on the amount drawn down at each stage, not the full approved facility. Your repayments increase incrementally as each progress payment is released to your builder.
What is a progress payment schedule in construction finance?
A progress payment schedule defines when funds are released during your build, typically across five or six stages tied to construction milestones. Each payment requires a progress inspection by the lender's valuer before funds are released to your builder.
Can I fix my interest rate during the construction phase?
Most construction loans operate on a variable rate during the building phase. You can typically lock in a fixed rate once construction completes and the loan converts to standard repayments, or some lenders allow you to lock a rate at application with a hold period.
Why do lenders require a contingency in my construction loan?
A contingency buffer covers cost variations, unforeseen site conditions, or council-required works during construction. Lenders typically approve 5% to 10% above your contracted build price to ensure funds are available if needed, though you only pay interest on what you actually draw.
