When to Use Construction Finance for Your Extension

If you own a home in Terrigal or elsewhere on the Central Coast and you're planning to add a second storey, extend the living area, or build a granny flat, you'll need construction finance rather than a standard home loan.

Construction finance is structured around progressive drawdowns. Instead of receiving the full loan amount upfront, funds are released in instalments as your extension reaches specific stages. You only pay interest on the amount drawn down, which keeps costs lower during the build.

How Construction Finance Differs From a Standard Home Loan

A standard home loan settles in one transaction. Construction finance releases funds in stages tied to your progress payment schedule. After the builder completes the slab, for instance, you request a drawdown. The lender arranges a progress inspection, then releases the next instalment directly to the builder or into your account, depending on the contract type.

This structure protects both you and the lender. The builder receives payment as work progresses, and the lender only advances funds when there's tangible progress on site.

What Lenders Require Before Approval

Lenders need council approval, a fixed price building contract with a registered builder, and a detailed cost breakdown before they'll approve construction funding. If you're planning a two-storey extension in North Avoca, the lender will want to see the development application approval from Central Coast Council, along with architectural plans and a signed contract.

Most lenders also require the project to commence building within a set period from the disclosure date, typically six months. If you delay the start, you may need to reapply or update your contract.

How the Progressive Drawdown Works in Practice

Consider a buyer who owns a single-storey home in Erina and wants to add a second storey with two bedrooms and a bathroom. The fixed price building contract totals $280,000. The progress payment schedule might break down as: deposit on signing, slab and frame stage, lock-up stage, fixing stage, and practical completion. Each stage triggers a drawdown request.

At each stage, you contact your lender or broker to request the next payment. The lender sends a certifier or valuer to confirm the work matches the progress claimed, then releases the funds. During construction, you make interest-only repayments on the amount drawn down so far. Once the extension is complete and the final drawdown occurs, the loan converts to a standard principal and interest home loan or remains interest-only if that suits your circumstances.

Fixed Price Contracts and Cost Plus Contracts

Most lenders prefer a fixed price building contract with a registered builder. This contract locks in the total cost upfront, which reduces risk for both you and the lender. The progress payment schedule is agreed in advance, and each drawdown matches a specific stage.

A cost plus contract, where you pay for materials and labour as you go, is harder to finance. Lenders see this as higher risk because the final cost isn't fixed. If you're an owner builder or using a cost plus arrangement, fewer lenders will support the project, and the ones that do may require a larger deposit or charge a higher construction loan interest rate.

Interest Costs During the Build

During construction, you only pay interest on the amount drawn down, not the full loan amount. If $100,000 has been released so far, interest is calculated on that amount, not the full $280,000. This keeps your repayments lower while the build is underway.

Most lenders also offer interest-only repayment options during construction, which further reduces the monthly commitment. Once the build is finished and the loan converts, you switch to principal and interest repayments unless you negotiate an ongoing interest-only period.

Lenders typically charge a progressive drawing fee each time you request a drawdown. This covers the cost of the progress inspection. The fee varies by lender, but it's usually a few hundred dollars per inspection.

Council Approval and Development Applications on the Coast

Central Coast Council requires a development application for most extensions, particularly if you're adding a second storey, increasing floor area significantly, or building within a heritage or environmentally sensitive area. Terrigal, for instance, has height and setback restrictions due to its coastal location and established character.

Your lender won't release funds until council approval is in place. If you've only lodged the DA but haven't received approval, the application will be delayed. Factor in council processing times when planning your timeline. On the Central Coast, DA approval can take several months depending on the complexity of the project and whether neighbours lodge objections.

How This Affects Your Borrowing Capacity

Lenders assess your ability to service the full loan amount, not just the current drawdown. Even though you're only paying interest on $100,000 initially, the lender will check whether you can afford repayments on the full $280,000 once construction is complete and the loan converts.

If you're refinancing your existing mortgage to fund the extension, the lender will assess your income, expenses, and the combined loan amount against the increased property value after completion. A valuer will provide an 'as if complete' valuation, which estimates what the property will be worth once the extension is finished.

When to Start the Application Process

Start your construction loan application as soon as you have council approval and a signed fixed price building contract. Lenders need time to assess the documentation, arrange a valuation, and prepare the loan for settlement.

If you wait until your builder is ready to start, you'll delay the project. Most builders require the deposit on signing, and they won't order materials or book subcontractors until that payment clears. Line up your finance early so the builder can start on time.

In our experience working with clients across the Central Coast, the most common delay is waiting for the fixed price contract to be finalised. Once you have that document and council approval, the application moves much more quickly.

Call one of our team or book an appointment at a time that works for you. We'll review your plans, confirm what documentation your lender will need, and make sure the structure matches your timeline and budget.

Frequently Asked Questions