A construction loan does not work like a home loan. The money is released in stages against work completed, you pay interest only on what has been drawn, and the lender inspects before each payment.
How staged drawdown works, why a fixed price contract opens the full lender panel while cost plus does not, and the four points where Sydney builds actually stall.
That structure is sensible, and it is also where builds get stuck. A variation signed on site, a valuation that comes in under the contract, or a builder invoicing ahead of the stage can all stop the next release.
This guide covers how progress payments work, why your contract type narrows the lender list before you apply, and the points where Sydney builds most commonly stall.
Four differences matter, and all of them affect cash flow during the build.
| Feature | Standard home loan | Construction loan |
|---|---|---|
| How funds are released | One amount at settlement | In stages against completed work |
| Interest charged on | The whole balance | Only the amount drawn so far |
| Repayments during the build | Principal and interest | Interest only, usually |
| Valuation basis | The property as it stands | On completion, against plans and specifications |
| Lender involvement | Ends at settlement | Inspection before each payment |
The valuation line is the one to understand early. The lender values what the finished house will be worth based on the plans, then lends against that figure. If the on-completion valuation lands below the land price plus the build cost, you fund the shortfall in cash.
The difference is set out further in construction loans compared with home loans.
Lenders are not primarily assessing your builder. They are assessing how much price risk sits with you.
Home building work in New South Wales is regulated, and contract requirements including written terms and insurance thresholds are set out in the NSW Government guidance on contracts for residential building work.
Practical point. Have your broker confirm the contract type is acceptable before you sign it. Signing a cost plus contract and then discovering that most lenders will not fund it is a difficult position to unwind.
A typical construction draw schedule nsw builders work to runs across five stages. The percentages vary between contracts, so read your own schedule rather than assuming the standard.
| Stage | What it covers | What releases the payment |
|---|---|---|
| Deposit | Contract signing | Signed contract, often paid by you rather than the lender |
| Base or slab | Footings and concrete slab poured | Inspection confirming the slab is complete |
| Frame | Frame erected and approved | Frame inspection certificate |
| Lock-up | Roof, external walls, windows and doors | Inspection confirming the building is secure |
| Fixing | Internal fit-out, cabinetry, fixtures | Inspection of completed internal work |
| Completion | Final works and handover | Occupation certificate and final inspection |
Two rules apply at every stage. The lender pays the builder directly, not you. And the lender pays for work completed, never work scheduled, which is why an invoice issued ahead of the stage simply waits.
More detail in how construction progress payments work.
Four things stop a build, and none of them are the loan itself.
Build a contingency into the budget. Not because something will definitely go wrong, but because the cost of a variation is always immediate and the funding for it never is.
Illustrative only. The purpose is to show how interest accrues on a construction loan compared with a single drawdown, not to quote a rate or a cost.
| Stage | Drawn this stage | Cumulative drawn | Interest accruing on |
|---|---|---|---|
| Land settlement | $600,000 | $600,000 | $600,000 |
| Slab | $75,000 | $675,000 | $675,000 |
| Frame | $90,000 | $765,000 | $765,000 |
| Lock-up | $105,000 | $870,000 | $870,000 |
| Fixing | $75,000 | $945,000 | $945,000 |
| Completion | $55,000 | $1,000,000 | $1,000,000 |
Interest is charged only on the cumulative column, which is why the early months cost far less than the later ones. Across a ten month build the saving against a single drawdown is significant, and it is the main reason construction lending is structured this way.
The planning point is that you are usually paying rent and construction interest at the same time. Budget for both, and allow for the build taking longer than the contract says.
The builds that run smoothly are the ones where every variation reaches me the week it is signed. The ones that stall are where three variations surface at the lock-up draw and nobody has told the lender.
Paritosh Wadhwani, Director and Principal Broker, APW Finance
In stages against work completed, usually slab, frame, lock-up, fixing and completion. The lender inspects or obtains certification before releasing each payment and pays the builder directly rather than paying you. You are charged interest only on the amount drawn so far, which keeps the early months considerably cheaper than the later ones.
Usually not. Most construction loans are interest only during the build, and the interest is calculated on the cumulative amount drawn rather than the full approved limit. Principal and interest repayments generally start once the loan converts to a standard home loan at completion. You will often be paying rent at the same time, so budget for both.
A variation changes the contract price and must be documented and approved before the lender will fund it. If the increase takes the total above the approved loan, you either contribute the difference in cash or apply to increase the loan, which means a fresh assessment. Send every signed variation to your broker immediately rather than at the next draw.
Some lenders allow it but the terms are noticeably tighter, with lower maximum loan-to-value ratios and more documentation, and a number of lenders decline owner builder applications entirely. The reason is that there is no licensed builder carrying the completion obligation, which transfers risk to the lender. Expect a larger deposit requirement.
It varies substantially between councils and depends on whether you are going through a development application or a complying development certificate. A complying development pathway is generally faster where the proposal fits within the standards. Neither timeframe is controlled by your builder, so allow for it when planning your finance and your rental arrangements.
A fixed price contract sets the build cost up front and leaves the price risk with the builder, and it is accepted by the full lender panel. A cost plus contract charges actual costs plus a margin, so the final figure is unknown at the outset. Far fewer lenders will fund cost plus arrangements, and those that do apply stricter conditions.
Construction finance is straightforward when the contract is fixed price and variations are documented as they happen. It becomes difficult when either of those is missing.
Confirm the contract type with your broker before signing, and establish the on-completion valuation position before you commit to the build.
Read more about construction lending or residential lending. You can also read knockdown rebuild costs in Sydney or how approval stages work.
Ask us to review your building contract before you sign.
Paritosh Wadhwani | Director and Principal Broker, APW Finance
Member of the Finance Brokers Association of Australia (FBAA). Arranging residential, commercial and specialist lending for Sydney clients across a panel of more than 50 lenders.
APW Finance Pty Ltd, 304/20a Lexington Drive, Bella Vista NSW 2153. Email: info@apwfinance.com. Phone: +61 447 959 546.
ACN 620 646 479 | ABN 79 620 646 479
This guide is general information only. It does not take into account your objectives, financial situation or needs, and it is not financial or credit advice. Lending criteria, interest rates, duty thresholds and government schemes change, and every application is subject to lender approval. Consider whether this information suits your circumstances and seek independent advice before acting. Figures quoted are current at the date below and should be confirmed before you rely on them. Last reviewed: October 2026.
APW Finance Pty Ltd delivers expert lending solutions with personalised service, empowering clients across residential, commercial, and business sectors.