Understanding the Basics of Building Project Funding

Construction finance lets you fund a build without handing over the full loan amount upfront. Instead, lenders release funds progressively as your build reaches verified stages, and you only pay interest on what's been drawn down so far.

How Construction Finance Differs from Standard Home Loans

A standard home loan releases the full amount at settlement. Construction finance releases funds in stages tied to your building contract, typically five to seven drawdowns across foundation, frame, lock-up, fixing, and practical completion. Each release requires a progress inspection by the lender's valuer to confirm the stage is complete and the amount drawn matches the work done.

You'll pay interest only on the amount drawn down at each stage. If $150,000 has been released for the slab and frame, your repayments are calculated on that amount, not the full loan. Once construction finishes and you move to the permanent loan phase, repayments switch to principal and interest across the full amount.

What Lenders Assess in a Construction Loan Application

Lenders assess your income, existing debts, and deposit just like any home loan, but they also review the building contract, council approval, and your builder's credentials. Most require a registered builder working under a fixed price building contract, though some lenders will consider owner builder finance if you have relevant trade qualifications and can demonstrate project management capability.

The building contract needs to include a detailed progress payment schedule that aligns with the lender's drawdown stages. If your builder's payment schedule doesn't match the lender's inspection points, the contract may need to be amended before approval. Council approval must be unconditional before the lender will issue formal approval, and you'll typically need to commence building within a set period from the disclosure date, usually six to twelve months depending on the lender.

Land and Construction Packages vs Building on Owned Land

If you're buying a house and land package, the lender structures the loan in two parts: one for the land purchase that settles immediately, and one for the construction phase that draws down progressively. You'll start paying principal and interest on the land portion straight away, then interest-only on construction drawdowns as they're released.

Consider a buyer purchasing a $200,000 block in Leppington with a $350,000 build contract. The lender approves $550,000 total, split into a $200,000 land loan and a $350,000 construction facility. The land loan settles at purchase, with repayments starting immediately. The construction loan sits dormant until the first drawdown for the slab, then each stage is released and added to the interest calculation. Once the build is complete, both portions roll into a single construction to permanent loan with standard principal and interest repayments.

If you already own suitable land or are building on a block you purchased separately, the entire loan is structured as construction finance. There's no land component to settle upfront, so you're only paying interest on progressive drawdowns until the build is finished.

Fixed Price Contracts and Cost Plus Arrangements

Most lenders in NSW will only approve construction finance against a fixed price building contract with a registered builder. The contract locks in the total build cost, which protects both you and the lender from budget blowouts. If the builder encounters unexpected costs, they wear it unless the contract includes specific variation clauses.

Some lenders will consider a cost plus contract, where you pay the builder's actual costs plus an agreed margin or fee. This structure is more common with custom design builds or renovations where the full scope can't be locked down upfront. Lenders treat cost plus as higher risk, so expect a larger deposit requirement and potentially higher interest rates. You'll also need a detailed scope of works and a realistic contingency buffer built into the loan amount.

How the Progressive Drawdown Schedule Works

The lender releases funds at predefined stages, typically slab or base stage, frame stage, lock-up, fixing or internal fit-out, and practical completion. Each stage requires a progress inspection arranged by the lender, usually through a panel valuer. The valuer confirms the stage is complete, assesses whether the work aligns with the contract value, and recommends a drawdown amount.

Once the inspection is approved, the lender releases funds directly to the builder or into a nominated account. Timing matters because builders won't start the next stage until they're paid for the current one. If the inspection is delayed or the valuer queries the work, your build timeline can stall. Most lenders charge a progressive drawing fee for each inspection and drawdown, typically $300 to $500 per stage, which is either paid upfront or capitalised into the loan.

Interest During Construction and Cash Flow Management

You only pay interest on the amount drawn down, which keeps repayments lower during the build. If $200,000 has been released and your construction loan interest rate is 6.5%, your monthly interest is around $1,080. As each stage draws down, the interest amount increases.

Some borrowers underestimate the cash flow impact of overlapping costs. If you're renting while building, you're paying rent, interest on the construction loan, and possibly principal and interest on a land loan component all at once. Running the numbers before you commit avoids a situation where repayments exceed what you can service comfortably. Lenders assess your ability to service the full loan amount from day one, even though you're not drawing it all immediately, so if you can't demonstrate serviceability at the peak loan amount, you won't get approved.

Renovation Finance and Extending Existing Homes

Renovation finance works similarly to new build construction loans but is structured around the scope of works rather than a full building contract. Lenders will assess the renovation plan, council plans if required, and quotes from your builder or individual trades like plumbers and electricians if you're managing the project yourself.

Not all lenders offer renovation finance, and those that do often cap the loan-to-value ratio lower than a standard refinancing scenario. If you're planning a major structural renovation or extension, expect the lender to treat it like a construction loan with progressive drawdowns and inspections. Minor cosmetic updates are usually funded through a home improvement loan or equity release without staged payments.

What Happens If the Build Goes Over Budget

If your builder submits variations that push the contract price beyond the approved loan amount, you'll need to cover the difference from your own funds or apply for a loan top-up. Lenders don't automatically increase the facility mid-build, and a top-up application goes through the same assessment process as the original approval.

In situations where the builder goes into liquidation or abandons the build, the lender will freeze further drawdowns and require you to engage a new builder to complete the work. The loan remains in place, but you'll need to fund any gaps between what's been drawn and what's required to finish. Some lenders offer builder warranty insurance as a condition of approval, which provides limited protection if the builder fails to complete.

Switching from Interest-Only to Principal and Interest

Once the build reaches practical completion and you've moved in or settled the final drawdown, the loan converts from interest-only construction funding to a standard principal and interest home loan. This happens automatically based on the loan terms, though some lenders let you extend the interest-only period if your circumstances have changed.

Your repayments will jump noticeably when you switch to principal and interest, so factor that into your budget from the outset. If you've been paying $1,500 per month in interest during construction, expect repayments closer to $3,200 per month once the full loan is amortising over 30 years. Lenders assess your ability to service the final repayment amount during the application, but the reality of that increase can still catch borrowers off guard if they haven't planned for it.

Construction finance gives you control over how funds are released and ensures you're only paying for work that's been completed and verified. The structure protects you from paying a builder upfront and finding out later the money's been spent elsewhere. Call one of our team or book an appointment at a time that works for you to talk through your build, your budget, and how the drawdown schedule aligns with your builder's payment terms.

Frequently Asked Questions